mirror of
https://github.com/konvajs/konva.git
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TextPath extends Shape instead of Path. Extracted common path functions into PathHelper.js. Updated unit tests.
This commit is contained in:
Jason Follas
parent
eccd8b7e64
commit
5d77471f7e
@ -9,148 +9,153 @@
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* @param {Object} config
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*/
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Kinetic.Path = Kinetic.Shape.extend({
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init: function(config) {
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this.shapeType = "Path";
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this.dataArray = [];
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var that = this;
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if (config.drawFunc == null) {
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config.drawFunc = function(context) {
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init : function (config) {
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this.shapeType = "Path";
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this.dataArray = [];
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var that = this;
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config.drawFunc = function (context) {
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var ca = this.dataArray;
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// context position
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context.beginPath();
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for(var n = 0; n < ca.length; n++) {
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for (var n = 0; n < ca.length; n++) {
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var c = ca[n].command;
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var p = ca[n].points;
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switch(c) {
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case 'L':
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context.lineTo(p[0], p[1]);
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break;
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case 'M':
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context.moveTo(p[0], p[1]);
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break;
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case 'C':
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context.bezierCurveTo(p[0], p[1], p[2], p[3], p[4], p[5]);
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break;
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case 'Q':
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context.quadraticCurveTo(p[0], p[1], p[2], p[3]);
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break;
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case 'A':
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var cx = p[0], cy = p[1], rx = p[2], ry = p[3], theta = p[4], dTheta = p[5], psi = p[6], fs = p[7];
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var r = (rx > ry) ? rx : ry;
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var scaleX = (rx > ry) ? 1 : rx / ry;
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var scaleY = (rx > ry) ? ry / rx : 1;
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context.translate(cx, cy);
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context.rotate(psi);
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context.scale(scaleX, scaleY);
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context.arc(0, 0, r, theta, theta + dTheta, 1 - fs);
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context.scale(1 / scaleX, 1 / scaleY);
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context.rotate(-psi);
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context.translate(-cx, -cy);
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break;
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case 'z':
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context.closePath();
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break;
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switch (c) {
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case 'L':
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context.lineTo(p[0], p[1]);
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break;
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case 'M':
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context.moveTo(p[0], p[1]);
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break;
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case 'C':
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context.bezierCurveTo(p[0], p[1], p[2], p[3], p[4], p[5]);
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break;
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case 'Q':
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context.quadraticCurveTo(p[0], p[1], p[2], p[3]);
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break;
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case 'A':
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var cx = p[0],
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cy = p[1],
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rx = p[2],
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ry = p[3],
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theta = p[4],
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dTheta = p[5],
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psi = p[6],
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fs = p[7];
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var r = (rx > ry) ? rx : ry;
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var scaleX = (rx > ry) ? 1 : rx / ry;
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var scaleY = (rx > ry) ? ry / rx : 1;
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context.translate(cx, cy);
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context.rotate(psi);
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context.scale(scaleX, scaleY);
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context.arc(0, 0, r, theta, theta + dTheta, 1 - fs);
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context.scale(1 / scaleX, 1 / scaleY);
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context.rotate(-psi);
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context.translate(-cx, -cy);
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break;
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case 'z':
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context.closePath();
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break;
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}
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}
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this.fill(context);
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this.stroke(context);
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};
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}
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// call super constructor
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this._super(config);
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this.dataArray = this._getDataArray();
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this.on('dataChange', function() {
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that.dataArray = that._getDataArray();
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});
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},
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/**
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* get parsed data array from the data
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* string. V, v, H, h, and l data are converted to
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* L data for the purpose of high performance Path
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* rendering
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*/
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_getDataArray: function() {
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// Path Data Segment must begin with a moveTo
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//m (x y)+ Relative moveTo (subsequent points are treated as lineTo)
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//M (x y)+ Absolute moveTo (subsequent points are treated as lineTo)
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//l (x y)+ Relative lineTo
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//L (x y)+ Absolute LineTo
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//h (x)+ Relative horizontal lineTo
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//H (x)+ Absolute horizontal lineTo
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//v (y)+ Relative vertical lineTo
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//V (y)+ Absolute vertical lineTo
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//z (closepath)
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//Z (closepath)
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//c (x1 y1 x2 y2 x y)+ Relative Bezier curve
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//C (x1 y1 x2 y2 x y)+ Absolute Bezier curve
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//q (x1 y1 x y)+ Relative Quadratic Bezier
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//Q (x1 y1 x y)+ Absolute Quadratic Bezier
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//t (x y)+ Shorthand/Smooth Relative Quadratic Bezier
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//T (x y)+ Shorthand/Smooth Absolute Quadratic Bezier
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//s (x2 y2 x y)+ Shorthand/Smooth Relative Bezier curve
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//S (x2 y2 x y)+ Shorthand/Smooth Absolute Bezier curve
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//a (rx ry x-axis-rotation large-arc-flag sweep-flag x y)+ Relative Elliptical Arc
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//A (rx ry x-axis-rotation large-arc-flag sweep-flag x y)+ Absolute Elliptical Arc
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// command string
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var cs = this.attrs.data;
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// return early if data is not defined
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if(!this.attrs.data) {
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return [];
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}
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// command chars
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var cc = ['m', 'M', 'l', 'L', 'v', 'V', 'h', 'H', 'z', 'Z', 'c', 'C', 'q', 'Q', 't', 'T', 's', 'S', 'a', 'A'];
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// convert white spaces to commas
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cs = cs.replace(new RegExp(' ', 'g'), ',');
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// create pipes so that we can split the data
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for(var n = 0; n < cc.length; n++) {
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cs = cs.replace(new RegExp(cc[n], 'g'), '|' + cc[n]);
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}
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// create array
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var arr = cs.split('|');
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var ca = [];
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// init context point
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var cpx = 0;
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var cpy = 0;
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for(var n = 1; n < arr.length; n++) {
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var str = arr[n];
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var c = str.charAt(0);
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str = str.slice(1);
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// remove ,- for consistency
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str = str.replace(new RegExp(',-', 'g'), '-');
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// add commas so that it's easy to split
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str = str.replace(new RegExp('-', 'g'), ',-');
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str = str.replace(new RegExp('e,-', 'g'), 'e-');
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var p = str.split(',');
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if(p.length > 0 && p[0] === '') {
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p.shift();
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// call super constructor
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this._super(config);
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this.dataArray = this._getDataArray();
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this.on('dataChange', function () {
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that.dataArray = that._getDataArray();
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});
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},
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/**
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* get parsed data array from the data
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* string. V, v, H, h, and l data are converted to
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* L data for the purpose of high performance Path
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* rendering
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*/
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_getDataArray : function () {
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// Path Data Segment must begin with a moveTo
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//m (x y)+ Relative moveTo (subsequent points are treated as lineTo)
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//M (x y)+ Absolute moveTo (subsequent points are treated as lineTo)
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//l (x y)+ Relative lineTo
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//L (x y)+ Absolute LineTo
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//h (x)+ Relative horizontal lineTo
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//H (x)+ Absolute horizontal lineTo
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//v (y)+ Relative vertical lineTo
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//V (y)+ Absolute vertical lineTo
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//z (closepath)
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//Z (closepath)
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//c (x1 y1 x2 y2 x y)+ Relative Bezier curve
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//C (x1 y1 x2 y2 x y)+ Absolute Bezier curve
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//q (x1 y1 x y)+ Relative Quadratic Bezier
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//Q (x1 y1 x y)+ Absolute Quadratic Bezier
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//t (x y)+ Shorthand/Smooth Relative Quadratic Bezier
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//T (x y)+ Shorthand/Smooth Absolute Quadratic Bezier
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//s (x2 y2 x y)+ Shorthand/Smooth Relative Bezier curve
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//S (x2 y2 x y)+ Shorthand/Smooth Absolute Bezier curve
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//a (rx ry x-axis-rotation large-arc-flag sweep-flag x y)+ Relative Elliptical Arc
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//A (rx ry x-axis-rotation large-arc-flag sweep-flag x y)+ Absolute Elliptical Arc
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// command string
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var cs = this.attrs.data;
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// return early if data is not defined
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if (!this.attrs.data) {
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return [];
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}
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// convert strings to floats
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for(var i = 0; i < p.length; i++) {
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p[i] = parseFloat(p[i]);
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// command chars
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var cc = ['m', 'M', 'l', 'L', 'v', 'V', 'h', 'H', 'z', 'Z', 'c', 'C', 'q', 'Q', 't', 'T', 's', 'S', 'a', 'A'];
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// convert white spaces to commas
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cs = cs.replace(new RegExp(' ', 'g'), ',');
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// create pipes so that we can split the data
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for (var n = 0; n < cc.length; n++) {
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cs = cs.replace(new RegExp(cc[n], 'g'), '|' + cc[n]);
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}
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while(p.length > 0) {
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if(isNaN(p[0]))// case for a trailing comma before next command
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break;
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var cmd = undefined;
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var points = [];
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var startX = cpx, startY = cpy;
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// convert l, H, h, V, and v to L
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switch(c) {
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// Note: Keep the lineTo's above the moveTo's in this switch
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// create array
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var arr = cs.split('|');
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var ca = [];
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// init context point
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var cpx = 0;
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var cpy = 0;
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for (var n = 1; n < arr.length; n++) {
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var str = arr[n];
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var c = str.charAt(0);
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str = str.slice(1);
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// remove ,- for consistency
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str = str.replace(new RegExp(',-', 'g'), '-');
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// add commas so that it's easy to split
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str = str.replace(new RegExp('-', 'g'), ',-');
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str = str.replace(new RegExp('e,-', 'g'), 'e-');
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var p = str.split(',');
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if (p.length > 0 && p[0] === '') {
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p.shift();
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}
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// convert strings to floats
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for (var i = 0; i < p.length; i++) {
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p[i] = parseFloat(p[i]);
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}
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while (p.length > 0) {
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if (isNaN(p[0])) // case for a trailing comma before next command
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break;
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var cmd = null;
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var points = [];
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var startX = cpx,
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startY = cpy;
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// convert l, H, h, V, and v to L
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switch (c) {
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// Note: Keep the lineTo's above the moveTo's in this switch
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case 'l':
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cpx += p.shift();
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cpy += p.shift();
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@ -162,8 +167,8 @@ Kinetic.Path = Kinetic.Shape.extend({
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cpy = p.shift();
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points.push(cpx, cpy);
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break;
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// Note: lineTo handlers need to be above this point
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// Note: lineTo handlers need to be above this point
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case 'm':
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cpx += p.shift();
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cpy += p.shift();
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@ -180,7 +185,7 @@ Kinetic.Path = Kinetic.Shape.extend({
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c = 'L';
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// subsequent points are treated as absolute lineTo
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break;
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case 'h':
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cpx += p.shift();
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cmd = 'L';
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@ -211,30 +216,32 @@ Kinetic.Path = Kinetic.Shape.extend({
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points.push(cpx + p.shift(), cpy + p.shift(), cpx + p.shift(), cpy + p.shift());
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cpx += p.shift();
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cpy += p.shift();
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cmd = 'C'
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cmd = 'C';
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points.push(cpx, cpy);
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break;
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case 'S':
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var ctlPtx = cpx, ctlPty = cpy;
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var ctlPtx = cpx,
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ctlPty = cpy;
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var prevCmd = ca[ca.length - 1];
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if(prevCmd.command === 'C') {
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if (prevCmd.command === 'C') {
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ctlPtx = cpx + (cpx - prevCmd.points[2]);
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ctlPty = cpy + (cpy - prevCmd.points[3]);
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}
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points.push(ctlPtx, ctlPty, p.shift(), p.shift())
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points.push(ctlPtx, ctlPty, p.shift(), p.shift());
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cpx = p.shift();
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cpy = p.shift();
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cmd = 'C';
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points.push(cpx, cpy);
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break;
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case 's':
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var ctlPtx = cpx, ctlPty = cpy;
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var ctlPtx = cpx,
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ctlPty = cpy;
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var prevCmd = ca[ca.length - 1];
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if(prevCmd.command === 'C') {
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if (prevCmd.command === 'C') {
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ctlPtx = cpx + (cpx - prevCmd.points[2]);
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ctlPty = cpy + (cpy - prevCmd.points[3]);
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}
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points.push(ctlPtx, ctlPty, cpx + p.shift(), cpy + p.shift())
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points.push(ctlPtx, ctlPty, cpx + p.shift(), cpy + p.shift());
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cpx += p.shift();
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cpy += p.shift();
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cmd = 'C';
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@ -250,13 +257,14 @@ Kinetic.Path = Kinetic.Shape.extend({
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points.push(cpx + p.shift(), cpy + p.shift());
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cpx += p.shift();
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cpy += p.shift();
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cmd = 'Q'
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cmd = 'Q';
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points.push(cpx, cpy);
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break;
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case 'T':
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var ctlPtx = cpx, ctlPty = cpy;
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var ctlPtx = cpx,
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ctlPty = cpy;
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var prevCmd = ca[ca.length - 1];
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if(prevCmd.command === 'Q') {
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if (prevCmd.command === 'Q') {
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ctlPtx = cpx + (cpx - prevCmd.points[0]);
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ctlPty = cpy + (cpy - prevCmd.points[1]);
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}
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@ -266,9 +274,10 @@ Kinetic.Path = Kinetic.Shape.extend({
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points.push(ctlPtx, ctlPty, cpx, cpy);
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break;
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case 't':
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var ctlPtx = cpx, ctlPty = cpy;
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var ctlPtx = cpx,
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ctlPty = cpy;
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var prevCmd = ca[ca.length - 1];
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if(prevCmd.command === 'Q') {
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if (prevCmd.command === 'Q') {
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ctlPtx = cpx + (cpx - prevCmd.points[0]);
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ctlPty = cpy + (cpy - prevCmd.points[1]);
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}
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@ -278,240 +287,57 @@ Kinetic.Path = Kinetic.Shape.extend({
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points.push(ctlPtx, ctlPty, cpx, cpy);
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break;
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case 'A':
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var rx = p.shift(), ry = p.shift(), psi = p.shift(), fa = p.shift(), fs = p.shift();
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var x1 = cpx, y1 = cpy;
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cpx = p.shift(), cpy = p.shift();
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var rx = p.shift(),
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ry = p.shift(),
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psi = p.shift(),
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fa = p.shift(),
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fs = p.shift();
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var x1 = cpx,
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y1 = cpy;
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cpx = p.shift(),
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cpy = p.shift();
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cmd = 'A';
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points = this._convertEndpointToCenterParameterization(x1, y1, cpx, cpy, fa, fs, rx, ry, psi);
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points = Kinetic.PathHelper.convertEndpointToCenterParameterization(x1, y1, cpx, cpy, fa, fs, rx, ry, psi);
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break;
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case 'a':
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var rx = p.shift(), ry = p.shift(), psi = p.shift(), fa = p.shift(), fs = p.shift();
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var x1 = cpx, y1 = cpy;
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cpx += p.shift(), cpy += p.shift();
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var rx = p.shift(),
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ry = p.shift(),
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psi = p.shift(),
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fa = p.shift(),
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fs = p.shift();
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var x1 = cpx,
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y1 = cpy;
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cpx += p.shift(),
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cpy += p.shift();
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cmd = 'A';
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points = this._convertEndpointToCenterParameterization(x1, y1, cpx, cpy, fa, fs, rx, ry, psi);
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points = Kinetic.PathHelper.convertEndpointToCenterParameterization(x1, y1, cpx, cpy, fa, fs, rx, ry, psi);
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break;
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}
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ca.push({
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command : cmd || c,
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points : points,
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start : {
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x : startX,
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y : startY
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},
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pathLength : Kinetic.PathHelper.calcLength(startX, startY, cmd || c, points)
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});
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}
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ca.push({
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command: cmd || c,
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points: points,
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start: {x: startX, y: startY},
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pathLength: this._calcLength(startX, startY, cmd || c, points)
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});
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if (c === 'z' || c === 'Z')
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ca.push({
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command : 'z',
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points : [],
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start : undefined,
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pathLength : 0
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});
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}
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if(c === 'z' || c === 'Z')
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ca.push({
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command: 'z',
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points: [],
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start: undefined,
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pathLength: 0
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});
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}
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return ca;
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},
|
||||
_convertEndpointToCenterParameterization: function(x1, y1, x2, y2, fa, fs, rx, ry, psiDeg) {
|
||||
|
||||
// Derived from: http://www.w3.org/TR/SVG/implnote.html#ArcImplementationNotes
|
||||
|
||||
var psi = psiDeg * (Math.PI / 180.0);
|
||||
|
||||
var xp = Math.cos(psi) * (x1 - x2) / 2.0 + Math.sin(psi) * (y1 - y2) / 2.0;
|
||||
var yp = -1 * Math.sin(psi) * (x1 - x2) / 2.0 + Math.cos(psi) * (y1 - y2) / 2.0;
|
||||
|
||||
var lambda = (xp * xp) / (rx * rx) + (yp * yp) / (ry * ry);
|
||||
|
||||
if(lambda > 1) {
|
||||
rx *= Math.sqrt(lambda);
|
||||
ry *= Math.sqrt(lambda);
|
||||
}
|
||||
|
||||
var f = Math.sqrt((((rx * rx) * (ry * ry)) - ((rx * rx) * (yp * yp)) - ((ry * ry) * (xp * xp))) / ((rx * rx) * (yp * yp) + (ry * ry) * (xp * xp)));
|
||||
|
||||
if(fa == fs)
|
||||
f *= -1;
|
||||
if(isNaN(f))
|
||||
f = 0;
|
||||
|
||||
var cxp = f * rx * yp / ry;
|
||||
var cyp = f * -ry * xp / rx;
|
||||
|
||||
var cx = (x1 + x2) / 2.0 + Math.cos(psi) * cxp - Math.sin(psi) * cyp;
|
||||
var cy = (y1 + y2) / 2.0 + Math.sin(psi) * cxp + Math.cos(psi) * cyp;
|
||||
|
||||
var vMag = function(v) {
|
||||
return Math.sqrt(v[0] * v[0] + v[1] * v[1]);
|
||||
}
|
||||
var vRatio = function(u, v) {
|
||||
return (u[0] * v[0] + u[1] * v[1]) / (vMag(u) * vMag(v))
|
||||
}
|
||||
var vAngle = function(u, v) {
|
||||
return (u[0] * v[1] < u[1] * v[0] ? -1 : 1) * Math.acos(vRatio(u, v));
|
||||
}
|
||||
var theta = vAngle([1, 0], [(xp - cxp) / rx, (yp - cyp) / ry]);
|
||||
|
||||
var u = [(xp - cxp) / rx, (yp - cyp) / ry];
|
||||
var v = [(-1 * xp - cxp) / rx, (-1 * yp - cyp) / ry];
|
||||
var dTheta = vAngle(u, v);
|
||||
|
||||
if(vRatio(u, v) <= -1)
|
||||
dTheta = Math.PI;
|
||||
if(vRatio(u, v) >= 1)
|
||||
dTheta = 0;
|
||||
|
||||
if(fs == 0 && dTheta > 0)
|
||||
dTheta = dTheta - 2 * Math.PI;
|
||||
if(fs == 1 && dTheta < 0)
|
||||
dTheta = dTheta + 2 * Math.PI;
|
||||
|
||||
return [cx, cy, rx, ry, theta, dTheta, psi, fs];
|
||||
},
|
||||
_calcLength: function(x, y, cmd, points) {
|
||||
switch (cmd) {
|
||||
case 'L':
|
||||
return this._getLineLength(x, y, points[0], points[1]);
|
||||
case 'C':
|
||||
// Approximates by breaking curve into 100 line segments
|
||||
var len = 0.0;
|
||||
var p1 = this._getPointOnCubicBezier(0, x, y, points[0], points[1], points[2], points[3], points[4], points[5]);
|
||||
|
||||
for (t=0.01; t <= 1; t += 0.01)
|
||||
{
|
||||
var p2 = this._getPointOnCubicBezier(t, x, y, points[0], points[1], points[2], points[3], points[4], points[5]);
|
||||
len += this._getLineLength(p1.x, p1.y, p2.x, p2.y);
|
||||
p1 = p2;
|
||||
}
|
||||
return len;
|
||||
case 'Q':
|
||||
// Approximates by breaking curve into 100 line segments
|
||||
var len = 0.0;
|
||||
var p1 = this._getPointOnQuadraticBezier(0, x, y, points[0], points[1], points[2], points[3]);
|
||||
|
||||
for (t=0.01; t <= 1; t += 0.01)
|
||||
{
|
||||
var p2 = this._getPointOnQuadraticBezier(t, x, y, points[0], points[1], points[2], points[3]);
|
||||
len += this._getLineLength(p1.x, p1.y, p2.x, p2.y);
|
||||
p1 = p2;
|
||||
}
|
||||
return len;
|
||||
case 'A':
|
||||
// Approximates by breaking curve into line segments
|
||||
var len = 0.0;
|
||||
var start = points[4]; // 4 = theta
|
||||
var dTheta = points[5];// 5 = dTheta
|
||||
var end = points[4] + dTheta;
|
||||
|
||||
var inc = Math.PI / 180.0; // 1 degree resolution
|
||||
if (Math.abs(start - end) < inc)
|
||||
inc = Math.abs(start - end);
|
||||
|
||||
// Note: for purpose of calculating arc length, not going to worry about rotating X-axis by angle psi
|
||||
|
||||
var p1 = this._getPointOnEllipticalArc(points[0], points[1], points[2], points[3], start, 0);
|
||||
|
||||
if (dTheta < 0) // clockwise
|
||||
{
|
||||
for (t=start - inc; t > end; t -= inc)
|
||||
{
|
||||
var p2 = this._getPointOnEllipticalArc(points[0], points[1], points[2], points[3], t, 0)
|
||||
len += this._getLineLength(p1.x, p1.y, p2.x, p2.y);
|
||||
p1 = p2
|
||||
}
|
||||
}
|
||||
else // counter-clockwise
|
||||
{
|
||||
for (t=start + inc; t < end; t += inc)
|
||||
{
|
||||
var p2 = this._getPointOnEllipticalArc(points[0], points[1], points[2], points[3], t, 0)
|
||||
len += this._getLineLength(p1.x, p1.y, p2.x, p2.y);
|
||||
p1 = p2
|
||||
}
|
||||
}
|
||||
|
||||
var p2 = this._getPointOnEllipticalArc(points[0], points[1], points[2], points[3], end, 0)
|
||||
len += this._getLineLength(p1.x, p1.y, p2.x, p2.y);
|
||||
|
||||
return len;
|
||||
}
|
||||
|
||||
return 0;
|
||||
},
|
||||
_getLineLength: function(x1, y1, x2, y2) {
|
||||
|
||||
return Math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1));
|
||||
},
|
||||
_getPointOnLine: function(dist, P1x, P1y, P2x, P2y, fromX, fromY) {
|
||||
|
||||
if (fromX === undefined)
|
||||
fromX = P1x;
|
||||
|
||||
if (fromY === undefined)
|
||||
fromY = P1y;
|
||||
|
||||
|
||||
var m = (P2y - P1y) / ((P2x - P1x) + .00000001);
|
||||
var b = -1 * m * P1x + P1y;
|
||||
var run = Math.sqrt(dist * dist / (1 + m * m));
|
||||
var rise = m * run;
|
||||
|
||||
if ((fromY - P1y) / ((fromX - P1x) + .00000001) === m)
|
||||
{
|
||||
return {x: fromX + run, y: fromY + rise};
|
||||
return ca;
|
||||
}
|
||||
else
|
||||
{
|
||||
var ix, iy;
|
||||
|
||||
var len = this._getLineLength(P1x, P1y, P2x, P2y)
|
||||
if (len < 0.00000001)
|
||||
return undefined;
|
||||
|
||||
var u = (((fromX - P1x) * (P2x - P1x)) + ((fromY - P1y) * (P2y - P1y)))
|
||||
u = u / (len * len)
|
||||
|
||||
ix = P1x + u * (P2x - P1x)
|
||||
iy = P1y + u * (P2y - P1y)
|
||||
|
||||
var pRise = this._getLineLength(fromX, fromY, ix, iy);
|
||||
var pRun = Math.sqrt(dist * dist - pRise * pRise);
|
||||
|
||||
run = Math.sqrt(pRun * pRun / (1 + m * m));
|
||||
rise = m * run;
|
||||
|
||||
return {x: ix + run, y: iy + rise};
|
||||
|
||||
}
|
||||
},
|
||||
_getPointOnCubicBezier: function(pct, P1x, P1y, P2x, P2y, P3x, P3y, P4x, P4y) {
|
||||
function CB1(t) { return t * t * t }
|
||||
function CB2(t) { return 3 * t * t * (1 - t) }
|
||||
function CB3(t) { return 3 * t * (1 - t) * (1 - t) }
|
||||
function CB4(t) { return (1 - t) * (1 - t) * (1 - t) }
|
||||
|
||||
var x = P4x * CB1(pct) + P3x * CB2(pct) + P2x * CB3(pct) + P1x * CB4(pct);
|
||||
var y = P4y * CB1(pct) + P3y * CB2(pct) + P2y * CB3(pct) + P1y * CB4(pct);
|
||||
|
||||
return {x: x, y: y};
|
||||
},
|
||||
_getPointOnQuadraticBezier: function(pct, P1x, P1y, P2x, P2y, P3x, P3y) {
|
||||
function QB1(t) { return t * t }
|
||||
function QB2(t) { return 2 * t * (1 - t) }
|
||||
function QB3(t) { return (1 - t) * (1 - t) }
|
||||
|
||||
var x = P3x * QB1(pct) + P2x * QB2(pct) + P1x * QB3(pct);
|
||||
var y = P3y * QB1(pct) + P2y * QB2(pct) + P1y * QB3(pct);
|
||||
|
||||
return {x: x, y: y};
|
||||
},
|
||||
_getPointOnEllipticalArc: function(cx, cy, rx, ry, theta, psi) {
|
||||
var cosPsi = Math.cos(psi), sinPsi = Math.sin(psi);
|
||||
var pt = {x: rx * Math.cos(theta), y: ry * Math.sin(theta)};
|
||||
return {x: cx + (pt.x * cosPsi - pt.y * sinPsi), y: cy + (pt.x * sinPsi + pt.y * cosPsi)};
|
||||
}
|
||||
});
|
||||
});
|
||||
|
||||
// add getters setters
|
||||
Kinetic.Node.addGettersSetters(Kinetic.Path, ['data']);
|
||||
@ -530,4 +356,4 @@ Kinetic.Node.addGettersSetters(Kinetic.Path, ['data']);
|
||||
* get SVG path data string
|
||||
* @name getData
|
||||
* @methodOf Kinetic.Path.prototype
|
||||
*/
|
||||
*/
|
||||
|
||||
@ -8,274 +8,286 @@
|
||||
* @augments Kinetic.Path
|
||||
* @param {Object} config
|
||||
*/
|
||||
Kinetic.TextPath = Kinetic.Path.extend({
|
||||
init: function(config) {
|
||||
this.setDefaultAttrs({
|
||||
fontFamily: 'Calibri',
|
||||
fontSize: 12,
|
||||
fontStyle: 'normal',
|
||||
detectionType: 'path',
|
||||
text: ''
|
||||
});
|
||||
|
||||
this.dummyCanvas = document.createElement('canvas');
|
||||
this.shapeType = "TextPath";
|
||||
var that = this;
|
||||
|
||||
config.drawFunc = function(context) {
|
||||
var charArr = this.charArr;
|
||||
|
||||
context.font = this.attrs.fontStyle + ' ' + this.attrs.fontSize + 'pt ' + this.attrs.fontFamily;
|
||||
context.textBaseline = 'middle';
|
||||
context.textAlign = 'left';
|
||||
context.save();
|
||||
|
||||
var glyphInfo = this.glyphInfo;
|
||||
|
||||
for (var i=0; i < glyphInfo.length; i++)
|
||||
{
|
||||
Kinetic.TextPath = Kinetic.Shape.extend({
|
||||
init : function (config) {
|
||||
|
||||
this.setDefaultAttrs({
|
||||
fontFamily : 'Calibri',
|
||||
fontSize : 12,
|
||||
fontStyle : 'normal',
|
||||
detectionType : 'path',
|
||||
text : ''
|
||||
});
|
||||
|
||||
this.dummyCanvas = document.createElement('canvas');
|
||||
this.shapeType = "TextPath";
|
||||
this.dataArray = [];
|
||||
var that = this;
|
||||
|
||||
this._getDataArray = Kinetic.Path.prototype._getDataArray;
|
||||
|
||||
config.drawFunc = function (context) {
|
||||
var charArr = this.charArr;
|
||||
|
||||
context.font = this.attrs.fontStyle + ' ' + this.attrs.fontSize + 'pt ' + this.attrs.fontFamily;
|
||||
context.textBaseline = 'middle';
|
||||
context.textAlign = 'left';
|
||||
context.save();
|
||||
|
||||
var p0 = glyphInfo[i].p0;
|
||||
var p1 = glyphInfo[i].p1;
|
||||
var ht = parseFloat(this.attrs.fontSize);
|
||||
var glyphInfo = this.glyphInfo;
|
||||
|
||||
context.translate(p0.x, p0.y);
|
||||
|
||||
context.rotate(glyphInfo[i].rotation);
|
||||
|
||||
this.fillText(context, glyphInfo[i].text);
|
||||
this.strokeText(context, glyphInfo[i].text);
|
||||
|
||||
context.restore();
|
||||
|
||||
//// To assist with debugging visually, uncomment following
|
||||
// context.beginPath();
|
||||
// if (i % 2)
|
||||
// context.strokeStyle = 'cyan';
|
||||
// else
|
||||
// context.strokeStyle = 'green';
|
||||
|
||||
// context.moveTo(p0.x, p0.y);
|
||||
// context.lineTo(p1.x, p1.y);
|
||||
// context.stroke();
|
||||
}
|
||||
|
||||
context.restore();
|
||||
};
|
||||
|
||||
// call super constructor
|
||||
this._super(config);
|
||||
|
||||
// update text data for certain attr changes
|
||||
var attrs = ['padding', 'text', 'textStroke', 'textStrokeWidth'];
|
||||
for(var n = 0; n < attrs.length; n++) {
|
||||
var attr = attrs[n];
|
||||
this.on(attr + 'Change', that._setTextData);
|
||||
}
|
||||
|
||||
that._setTextData();
|
||||
},
|
||||
/**
|
||||
* get text width in pixels
|
||||
*/
|
||||
getTextWidth: function() {
|
||||
return this.textWidth;
|
||||
},
|
||||
/**
|
||||
* get text height in pixels
|
||||
*/
|
||||
getTextHeight: function() {
|
||||
return this.textHeight;
|
||||
},
|
||||
_getTextSize: function(text) {
|
||||
var dummyCanvas = this.dummyCanvas;
|
||||
var context = dummyCanvas.getContext('2d');
|
||||
|
||||
context.save();
|
||||
|
||||
context.font = this.attrs.fontStyle + ' ' + this.attrs.fontSize + 'pt ' + this.attrs.fontFamily;
|
||||
var metrics = context.measureText(text);
|
||||
|
||||
context.restore();
|
||||
|
||||
return {
|
||||
width: metrics.width,
|
||||
height: parseInt(this.attrs.fontSize, 10)
|
||||
};
|
||||
},
|
||||
/**
|
||||
* set text data.
|
||||
*/
|
||||
_setTextData: function() {
|
||||
|
||||
var that = this;
|
||||
var size = this._getTextSize(this.attrs.text);
|
||||
this.textWidth = size.width;
|
||||
this.textHeight = size.height;
|
||||
|
||||
this.glyphInfo = [];
|
||||
|
||||
var charArr = this.attrs.text.split('');
|
||||
|
||||
var p0 = undefined;
|
||||
var p1 = undefined;
|
||||
var pathCmd = undefined;
|
||||
var pIndex = -1;
|
||||
var currentT = 0;
|
||||
|
||||
var getNextPathSegment = function() {
|
||||
currentT = 0;
|
||||
var pathData = that.dataArray;
|
||||
|
||||
for (var i = pIndex + 1; i < pathData.length; i++) {
|
||||
if (pathData[i].pathLength > 0) {
|
||||
pIndex = i;
|
||||
for (var i = 0; i < glyphInfo.length; i++) {
|
||||
context.save();
|
||||
|
||||
return pathData[i];
|
||||
}
|
||||
else if (pathData[i].command == 'M') {
|
||||
p0 = {x: pathData[i].points[0], y: pathData[i].points[1]};
|
||||
var p0 = glyphInfo[i].p0;
|
||||
var p1 = glyphInfo[i].p1;
|
||||
var ht = parseFloat(this.attrs.fontSize);
|
||||
|
||||
context.translate(p0.x, p0.y);
|
||||
|
||||
context.rotate(glyphInfo[i].rotation);
|
||||
|
||||
this.fillText(context, glyphInfo[i].text);
|
||||
this.strokeText(context, glyphInfo[i].text);
|
||||
|
||||
context.restore();
|
||||
|
||||
//// To assist with debugging visually, uncomment following
|
||||
// context.beginPath();
|
||||
// if (i % 2)
|
||||
// context.strokeStyle = 'cyan';
|
||||
// else
|
||||
// context.strokeStyle = 'green';
|
||||
|
||||
// context.moveTo(p0.x, p0.y);
|
||||
// context.lineTo(p1.x, p1.y);
|
||||
// context.stroke();
|
||||
}
|
||||
|
||||
context.restore();
|
||||
};
|
||||
|
||||
// call super constructor
|
||||
this._super(config);
|
||||
|
||||
this.dataArray = this._getDataArray();
|
||||
|
||||
this.on('dataChange', function () {
|
||||
that.dataArray = that._getDataArray();
|
||||
});
|
||||
|
||||
// update text data for certain attr changes
|
||||
var attrs = ['padding', 'text', 'textStroke', 'textStrokeWidth'];
|
||||
for (var n = 0; n < attrs.length; n++) {
|
||||
var attr = attrs[n];
|
||||
this.on(attr + 'Change', that._setTextData);
|
||||
}
|
||||
|
||||
return {};
|
||||
}
|
||||
|
||||
var findSegmentToFitCharacter = function(c, before) {
|
||||
that._setTextData();
|
||||
},
|
||||
/**
|
||||
* get text width in pixels
|
||||
*/
|
||||
getTextWidth : function () {
|
||||
return this.textWidth;
|
||||
},
|
||||
/**
|
||||
* get text height in pixels
|
||||
*/
|
||||
getTextHeight : function () {
|
||||
return this.textHeight;
|
||||
},
|
||||
_getTextSize : function (text) {
|
||||
var dummyCanvas = this.dummyCanvas;
|
||||
var context = dummyCanvas.getContext('2d');
|
||||
|
||||
var glyphWidth = that._getTextSize(c).width;
|
||||
context.save();
|
||||
|
||||
var currLen = 0;
|
||||
var attempts = 0;
|
||||
var needNextSegment = false;
|
||||
context.font = this.attrs.fontStyle + ' ' + this.attrs.fontSize + 'pt ' + this.attrs.fontFamily;
|
||||
var metrics = context.measureText(text);
|
||||
|
||||
p1 = undefined;
|
||||
context.restore();
|
||||
|
||||
while (Math.abs(glyphWidth - currLen) / glyphWidth > 0.01 && attempts < 25) {
|
||||
attempts++;
|
||||
var cumulativePathLength = currLen;
|
||||
return {
|
||||
width : metrics.width,
|
||||
height : parseInt(this.attrs.fontSize, 10)
|
||||
};
|
||||
},
|
||||
/**
|
||||
* set text data.
|
||||
*/
|
||||
_setTextData : function () {
|
||||
|
||||
var that = this;
|
||||
var size = this._getTextSize(this.attrs.text);
|
||||
this.textWidth = size.width;
|
||||
this.textHeight = size.height;
|
||||
|
||||
this.glyphInfo = [];
|
||||
|
||||
var charArr = this.attrs.text.split('');
|
||||
|
||||
var p0,
|
||||
p1,
|
||||
pathCmd;
|
||||
|
||||
var pIndex = -1;
|
||||
var currentT = 0;
|
||||
|
||||
var getNextPathSegment = function () {
|
||||
currentT = 0;
|
||||
var pathData = that.dataArray;
|
||||
|
||||
while (pathCmd === undefined) {
|
||||
pathCmd = getNextPathSegment();
|
||||
|
||||
if (pathCmd && cumulativePathLength + pathCmd.pathLength < glyphWidth)
|
||||
{
|
||||
cumulativePathLength += pathCmd.pathLength;
|
||||
pathCmd = undefined;
|
||||
for (var i = pIndex + 1; i < pathData.length; i++) {
|
||||
if (pathData[i].pathLength > 0) {
|
||||
pIndex = i;
|
||||
|
||||
return pathData[i];
|
||||
} else if (pathData[i].command == 'M') {
|
||||
p0 = {
|
||||
x : pathData[i].points[0],
|
||||
y : pathData[i].points[1]
|
||||
};
|
||||
}
|
||||
}
|
||||
|
||||
if (pathCmd === {} || p0 === undefined)
|
||||
return undefined;
|
||||
|
||||
var needNewSegment = false;
|
||||
|
||||
switch(pathCmd.command) {
|
||||
case 'L':
|
||||
if (that._getLineLength(p0.x, p0.y, pathCmd.points[0], pathCmd.points[1]) > glyphWidth)
|
||||
{
|
||||
p1 = that._getPointOnLine(glyphWidth, p0.x, p0.y, pathCmd.points[0], pathCmd.points[1], p0.x, p0.y);
|
||||
return {};
|
||||
};
|
||||
|
||||
var findSegmentToFitCharacter = function (c, before) {
|
||||
|
||||
var glyphWidth = that._getTextSize(c).width;
|
||||
|
||||
var currLen = 0;
|
||||
var attempts = 0;
|
||||
var needNextSegment = false;
|
||||
|
||||
p1 = undefined;
|
||||
while (Math.abs(glyphWidth - currLen) / glyphWidth > 0.01 && attempts < 25) {
|
||||
attempts++;
|
||||
var cumulativePathLength = currLen;
|
||||
while (pathCmd === undefined) {
|
||||
pathCmd = getNextPathSegment();
|
||||
|
||||
if (pathCmd && cumulativePathLength + pathCmd.pathLength < glyphWidth) {
|
||||
cumulativePathLength += pathCmd.pathLength;
|
||||
pathCmd = undefined;
|
||||
}
|
||||
else
|
||||
}
|
||||
|
||||
if (pathCmd === {}
|
||||
|
||||
|| p0 === undefined)
|
||||
return undefined;
|
||||
|
||||
var needNewSegment = false;
|
||||
|
||||
switch (pathCmd.command) {
|
||||
case 'L':
|
||||
if (Kinetic.PathHelper.getLineLength(p0.x, p0.y, pathCmd.points[0], pathCmd.points[1]) > glyphWidth) {
|
||||
p1 = Kinetic.PathHelper.getPointOnLine(glyphWidth, p0.x, p0.y, pathCmd.points[0], pathCmd.points[1], p0.x, p0.y);
|
||||
} else
|
||||
pathCmd = undefined;
|
||||
break;
|
||||
case 'A':
|
||||
|
||||
var start = pathCmd.points[4]; // 4 = theta
|
||||
var dTheta = pathCmd.points[5];// 5 = dTheta
|
||||
var end = pathCmd.points[4] + dTheta;
|
||||
|
||||
if (currentT == 0)
|
||||
currentT = start + 0.00000001; // Just in case start is 0
|
||||
var start = pathCmd.points[4]; // 4 = theta
|
||||
var dTheta = pathCmd.points[5]; // 5 = dTheta
|
||||
var end = pathCmd.points[4] + dTheta;
|
||||
|
||||
if (currentT === 0)
|
||||
currentT = start + 0.00000001; // Just in case start is 0
|
||||
else if (glyphWidth > currLen)
|
||||
currentT += (Math.PI / 180.0) * dTheta / Math.abs(dTheta);
|
||||
else
|
||||
currentT -= Math.PI / 360.0 * dTheta / Math.abs(dTheta);
|
||||
currentT -= Math.PI / 360.0 * dTheta / Math.abs(dTheta);
|
||||
|
||||
if (Math.abs(currentT) > Math.abs(end)) {
|
||||
|
||||
|
||||
currentT = end;
|
||||
needNewSegment = true;
|
||||
}
|
||||
|
||||
p1 = that._getPointOnEllipticalArc(pathCmd.points[0], pathCmd.points[1], pathCmd.points[2], pathCmd.points[3], currentT, pathCmd.points[6]);
|
||||
|
||||
p1 = Kinetic.PathHelper.getPointOnEllipticalArc(pathCmd.points[0], pathCmd.points[1], pathCmd.points[2], pathCmd.points[3], currentT, pathCmd.points[6]);
|
||||
break;
|
||||
case 'C':
|
||||
if (currentT == 0) {
|
||||
if (currentT === 0) {
|
||||
if (glyphWidth > pathCmd.pathLength)
|
||||
currentT = 0.00000001;
|
||||
else
|
||||
currentT = glyphWidth / pathCmd.pathLength;
|
||||
}
|
||||
else if (glyphWidth > currLen)
|
||||
} else if (glyphWidth > currLen)
|
||||
currentT += (glyphWidth - currLen) / pathCmd.pathLength;
|
||||
else
|
||||
currentT -= (currLen - glyphWidth) / pathCmd.pathLength;
|
||||
|
||||
|
||||
if (currentT > 1.0) {
|
||||
currentT = 1.0;
|
||||
needNewSegment = true;
|
||||
}
|
||||
|
||||
p1 = that._getPointOnCubicBezier(currentT, pathCmd.start.x, pathCmd.start.y, pathCmd.points[0], pathCmd.points[1], pathCmd.points[2], pathCmd.points[3], pathCmd.points[4], pathCmd.points[5])
|
||||
|
||||
p1 = Kinetic.PathHelper.getPointOnCubicBezier(currentT, pathCmd.start.x, pathCmd.start.y, pathCmd.points[0], pathCmd.points[1], pathCmd.points[2], pathCmd.points[3], pathCmd.points[4], pathCmd.points[5]);
|
||||
break;
|
||||
case 'Q':
|
||||
if (currentT == 0)
|
||||
if (currentT === 0)
|
||||
currentT = glyphWidth / pathCmd.pathLength;
|
||||
else if (glyphWidth > currLen)
|
||||
currentT += (glyphWidth - currLen) / pathCmd.pathLength;
|
||||
else
|
||||
currentT -= (currLen - glyphWidth) / pathCmd.pathLength;
|
||||
|
||||
|
||||
if (currentT > 1.0) {
|
||||
currentT = 1.0;
|
||||
needNewSegment = true;
|
||||
}
|
||||
|
||||
p1 = that._getPointOnQuadraticBezier(currentT, pathCmd.start.x, pathCmd.start.y, pathCmd.points[0], pathCmd.points[1], pathCmd.points[2], pathCmd.points[3])
|
||||
break;
|
||||
|
||||
|
||||
p1 = Kinetic.PathHelper.getPointOnQuadraticBezier(currentT, pathCmd.start.x, pathCmd.start.y, pathCmd.points[0], pathCmd.points[1], pathCmd.points[2], pathCmd.points[3]);
|
||||
break;
|
||||
|
||||
}
|
||||
|
||||
if (p1 !== undefined) {
|
||||
currLen = Kinetic.PathHelper.getLineLength(p0.x, p0.y, p1.x, p1.y);
|
||||
}
|
||||
|
||||
if (needNewSegment) {
|
||||
needNewSegment = false;
|
||||
pathCmd = undefined;
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
for (var i = 0; i < charArr.length; i++) {
|
||||
|
||||
if (p1 !== undefined)
|
||||
{
|
||||
currLen = that._getLineLength(p0.x, p0.y, p1.x, p1.y);
|
||||
}
|
||||
// Find p1 such that line segment between p0 and p1 is approx. width of glyph
|
||||
findSegmentToFitCharacter(charArr[i]);
|
||||
|
||||
if (needNewSegment) {
|
||||
needNewSegment = false;
|
||||
pathCmd = undefined;
|
||||
}
|
||||
if (p0 === undefined || p1 === undefined)
|
||||
break;
|
||||
|
||||
var width = Kinetic.PathHelper.getLineLength(p0.x, p0.y, p1.x, p1.y);
|
||||
|
||||
// Note: Since glyphs are rendered one at a time, any kerning pair data built into the font will not be used.
|
||||
// Can foresee having a rough pair table built in that the developer can override as needed.
|
||||
|
||||
var kern = 0; // placeholder for future implementation
|
||||
|
||||
var midpoint = Kinetic.PathHelper.getPointOnLine(kern + width / 2.0, p0.x, p0.y, p1.x, p1.y);
|
||||
|
||||
var rotation = Math.atan2((p1.y - p0.y), (p1.x - p0.x));
|
||||
this.glyphInfo.push({
|
||||
transposeX : midpoint.x,
|
||||
transposeY : midpoint.y,
|
||||
text : charArr[i],
|
||||
rotation : rotation,
|
||||
p0 : p0,
|
||||
p1 : p1
|
||||
});
|
||||
|
||||
p0 = p1;
|
||||
}
|
||||
}
|
||||
|
||||
for (var i=0; i < charArr.length; i++) {
|
||||
|
||||
// Find p1 such that line segment between p0 and p1 is approx. width of glyph
|
||||
findSegmentToFitCharacter(charArr[i]);
|
||||
|
||||
if (p0 === undefined || p1 === undefined)
|
||||
break;
|
||||
|
||||
var width = this._getLineLength(p0.x, p0.y, p1.x, p1.y);
|
||||
|
||||
// Note: Since glyphs are rendered one at a time, any kerning pair data built into the font will not be used.
|
||||
// Can foresee having a rough pair table built in that the developer can override as needed.
|
||||
|
||||
var kern = 0; // placeholder for future implementation
|
||||
|
||||
var midpoint = this._getPointOnLine(kern + width / 2.0, p0.x, p0.y, p1.x, p1.y);
|
||||
|
||||
var rotation = Math.atan2((p1.y - p0.y),(p1.x - p0.x));
|
||||
this.glyphInfo.push({ transposeX: midpoint.x, transposeY: midpoint.y, text: charArr[i], rotation: rotation, p0:p0, p1:p1});
|
||||
|
||||
p0 = p1;
|
||||
}
|
||||
}
|
||||
});
|
||||
});
|
||||
|
||||
// add setters and getters
|
||||
Kinetic.Node.addGettersSetters(Kinetic.TextPath, ['fontFamily', 'fontSize', 'fontStyle', 'textFill', 'textStroke', 'textStrokeWidth', 'text']);
|
||||
|
||||
|
||||
231
src/plugins/util/PathHelper.js
Normal file
231
src/plugins/util/PathHelper.js
Normal file
@ -0,0 +1,231 @@
|
||||
///////////////////////////////////////////////////////////////////////
|
||||
// PathHelper
|
||||
///////////////////////////////////////////////////////////////////////
|
||||
Kinetic.PathHelper = {
|
||||
calcLength : function (x, y, cmd, points) {
|
||||
var len,
|
||||
p1,
|
||||
p2;
|
||||
|
||||
switch (cmd) {
|
||||
case 'L':
|
||||
return this.getLineLength(x, y, points[0], points[1]);
|
||||
case 'C':
|
||||
// Approximates by breaking curve into 100 line segments
|
||||
len = 0.0;
|
||||
p1 = this.getPointOnCubicBezier(0, x, y, points[0], points[1], points[2], points[3], points[4], points[5]);
|
||||
for (t = 0.01; t <= 1; t += 0.01) {
|
||||
p2 = this.getPointOnCubicBezier(t, x, y, points[0], points[1], points[2], points[3], points[4], points[5]);
|
||||
len += this.getLineLength(p1.x, p1.y, p2.x, p2.y);
|
||||
p1 = p2;
|
||||
}
|
||||
return len;
|
||||
case 'Q':
|
||||
// Approximates by breaking curve into 100 line segments
|
||||
len = 0.0;
|
||||
p1 = this.getPointOnQuadraticBezier(0, x, y, points[0], points[1], points[2], points[3]);
|
||||
for (t = 0.01; t <= 1; t += 0.01) {
|
||||
p2 = this.getPointOnQuadraticBezier(t, x, y, points[0], points[1], points[2], points[3]);
|
||||
len += this.getLineLength(p1.x, p1.y, p2.x, p2.y);
|
||||
p1 = p2;
|
||||
}
|
||||
return len;
|
||||
case 'A':
|
||||
// Approximates by breaking curve into line segments
|
||||
len = 0.0;
|
||||
var start = points[4]; // 4 = theta
|
||||
var dTheta = points[5]; // 5 = dTheta
|
||||
var end = points[4] + dTheta;
|
||||
var inc = Math.PI / 180.0; // 1 degree resolution
|
||||
if (Math.abs(start - end) < inc) {
|
||||
inc = Math.abs(start - end);
|
||||
}
|
||||
// Note: for purpose of calculating arc length, not going to worry about rotating X-axis by angle psi
|
||||
|
||||
p1 = this.getPointOnEllipticalArc(points[0], points[1], points[2], points[3], start, 0);
|
||||
if (dTheta < 0) { // clockwise
|
||||
for (t = start - inc; t > end; t -= inc) {
|
||||
p2 = this.getPointOnEllipticalArc(points[0], points[1], points[2], points[3], t, 0);
|
||||
len += this.getLineLength(p1.x, p1.y, p2.x, p2.y);
|
||||
p1 = p2;
|
||||
}
|
||||
} else { // counter-clockwise
|
||||
for (t = start + inc; t < end; t += inc) {
|
||||
p2 = this.getPointOnEllipticalArc(points[0], points[1], points[2], points[3], t, 0);
|
||||
len += this.getLineLength(p1.x, p1.y, p2.x, p2.y);
|
||||
p1 = p2;
|
||||
}
|
||||
}
|
||||
|
||||
p2 = this.getPointOnEllipticalArc(points[0], points[1], points[2], points[3], end, 0);
|
||||
len += this.getLineLength(p1.x, p1.y, p2.x, p2.y);
|
||||
|
||||
return len;
|
||||
}
|
||||
|
||||
return 0;
|
||||
},
|
||||
getLineLength : function (x1, y1, x2, y2) {
|
||||
|
||||
return Math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1));
|
||||
},
|
||||
getPointOnLine : function (dist, P1x, P1y, P2x, P2y, fromX, fromY) {
|
||||
|
||||
if (fromX === undefined) {
|
||||
fromX = P1x;
|
||||
}
|
||||
if (fromY === undefined) {
|
||||
fromY = P1y;
|
||||
}
|
||||
|
||||
var m = (P2y - P1y) / ((P2x - P1x) + 0.00000001);
|
||||
|
||||
var run = Math.sqrt(dist * dist / (1 + m * m));
|
||||
var rise = m * run;
|
||||
|
||||
var pt;
|
||||
|
||||
if ((fromY - P1y) / ((fromX - P1x) + 0.00000001) === m) {
|
||||
pt = {
|
||||
x : fromX + run,
|
||||
y : fromY + rise
|
||||
};
|
||||
} else {
|
||||
var ix,
|
||||
iy;
|
||||
|
||||
var len = this.getLineLength(P1x, P1y, P2x, P2y);
|
||||
if (len < 0.00000001) {
|
||||
return undefined;
|
||||
}
|
||||
var u = (((fromX - P1x) * (P2x - P1x)) + ((fromY - P1y) * (P2y - P1y)));
|
||||
u = u / (len * len);
|
||||
|
||||
ix = P1x + u * (P2x - P1x);
|
||||
iy = P1y + u * (P2y - P1y);
|
||||
|
||||
var pRise = this.getLineLength(fromX, fromY, ix, iy);
|
||||
var pRun = Math.sqrt(dist * dist - pRise * pRise);
|
||||
|
||||
run = Math.sqrt(pRun * pRun / (1 + m * m));
|
||||
rise = m * run;
|
||||
|
||||
pt = {
|
||||
x : ix + run,
|
||||
y : iy + rise
|
||||
};
|
||||
}
|
||||
|
||||
return pt;
|
||||
},
|
||||
getPointOnCubicBezier : function (pct, P1x, P1y, P2x, P2y, P3x, P3y, P4x, P4y) {
|
||||
function CB1(t) {
|
||||
return t * t * t;
|
||||
}
|
||||
function CB2(t) {
|
||||
return 3 * t * t * (1 - t);
|
||||
}
|
||||
function CB3(t) {
|
||||
return 3 * t * (1 - t) * (1 - t);
|
||||
}
|
||||
function CB4(t) {
|
||||
return (1 - t) * (1 - t) * (1 - t);
|
||||
}
|
||||
|
||||
var x = P4x * CB1(pct) + P3x * CB2(pct) + P2x * CB3(pct) + P1x * CB4(pct);
|
||||
var y = P4y * CB1(pct) + P3y * CB2(pct) + P2y * CB3(pct) + P1y * CB4(pct);
|
||||
|
||||
return {
|
||||
x : x,
|
||||
y : y
|
||||
};
|
||||
},
|
||||
getPointOnQuadraticBezier : function (pct, P1x, P1y, P2x, P2y, P3x, P3y) {
|
||||
function QB1(t) {
|
||||
return t * t;
|
||||
}
|
||||
function QB2(t) {
|
||||
return 2 * t * (1 - t);
|
||||
}
|
||||
function QB3(t) {
|
||||
return (1 - t) * (1 - t);
|
||||
}
|
||||
|
||||
var x = P3x * QB1(pct) + P2x * QB2(pct) + P1x * QB3(pct);
|
||||
var y = P3y * QB1(pct) + P2y * QB2(pct) + P1y * QB3(pct);
|
||||
|
||||
return {
|
||||
x : x,
|
||||
y : y
|
||||
};
|
||||
},
|
||||
getPointOnEllipticalArc : function (cx, cy, rx, ry, theta, psi) {
|
||||
var cosPsi = Math.cos(psi),
|
||||
sinPsi = Math.sin(psi);
|
||||
var pt = {
|
||||
x : rx * Math.cos(theta),
|
||||
y : ry * Math.sin(theta)
|
||||
};
|
||||
return {
|
||||
x : cx + (pt.x * cosPsi - pt.y * sinPsi),
|
||||
y : cy + (pt.x * sinPsi + pt.y * cosPsi)
|
||||
};
|
||||
},
|
||||
convertEndpointToCenterParameterization : function (x1, y1, x2, y2, fa, fs, rx, ry, psiDeg) {
|
||||
|
||||
// Derived from: http://www.w3.org/TR/SVG/implnote.html#ArcImplementationNotes
|
||||
|
||||
var psi = psiDeg * (Math.PI / 180.0);
|
||||
|
||||
var xp = Math.cos(psi) * (x1 - x2) / 2.0 + Math.sin(psi) * (y1 - y2) / 2.0;
|
||||
var yp = -1 * Math.sin(psi) * (x1 - x2) / 2.0 + Math.cos(psi) * (y1 - y2) / 2.0;
|
||||
|
||||
var lambda = (xp * xp) / (rx * rx) + (yp * yp) / (ry * ry);
|
||||
|
||||
if (lambda > 1) {
|
||||
rx *= Math.sqrt(lambda);
|
||||
ry *= Math.sqrt(lambda);
|
||||
}
|
||||
|
||||
var f = Math.sqrt((((rx * rx) * (ry * ry)) - ((rx * rx) * (yp * yp)) - ((ry * ry) * (xp * xp))) / ((rx * rx) * (yp * yp) + (ry * ry) * (xp * xp)));
|
||||
|
||||
if (fa == fs)
|
||||
f *= -1;
|
||||
if (isNaN(f))
|
||||
f = 0;
|
||||
|
||||
var cxp = f * rx * yp / ry;
|
||||
var cyp = f * -ry * xp / rx;
|
||||
|
||||
var cx = (x1 + x2) / 2.0 + Math.cos(psi) * cxp - Math.sin(psi) * cyp;
|
||||
var cy = (y1 + y2) / 2.0 + Math.sin(psi) * cxp + Math.cos(psi) * cyp;
|
||||
|
||||
var vMag = function (v) {
|
||||
return Math.sqrt(v[0] * v[0] + v[1] * v[1]);
|
||||
};
|
||||
var vRatio = function (u, v) {
|
||||
return (u[0] * v[0] + u[1] * v[1]) / (vMag(u) * vMag(v));
|
||||
};
|
||||
var vAngle = function (u, v) {
|
||||
return (u[0] * v[1] < u[1] * v[0] ? -1 : 1) * Math.acos(vRatio(u, v));
|
||||
};
|
||||
var theta = vAngle([1, 0], [(xp - cxp) / rx, (yp - cyp) / ry]);
|
||||
|
||||
var u = [(xp - cxp) / rx, (yp - cyp) / ry];
|
||||
var v = [(-1 * xp - cxp) / rx, (-1 * yp - cyp) / ry];
|
||||
var dTheta = vAngle(u, v);
|
||||
|
||||
if (vRatio(u, v) <= -1)
|
||||
dTheta = Math.PI;
|
||||
if (vRatio(u, v) >= 1)
|
||||
dTheta = 0;
|
||||
|
||||
if (fs === 0 && dTheta > 0)
|
||||
dTheta = dTheta - 2 * Math.PI;
|
||||
if (fs == 1 && dTheta < 0)
|
||||
dTheta = dTheta + 2 * Math.PI;
|
||||
|
||||
return [cx, cy, rx, ry, theta, dTheta, psi, fs];
|
||||
}
|
||||
|
||||
};
|
||||
File diff suppressed because one or more lines are too long
Loading…
Reference in New Issue
Block a user