fix arrow with tension. close 197

CHANGELOG.md

@@ -11,6 +11,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 * Fixed lineHeight behavior for `Konva.Text`
 * Some performance optimizations for `Konva.Text`
 * Better wrap algorithm for `Konva.Text`
+* fixed `Konva.Arrow` with tension != 0
 
 ## [2.0.3][2018-04-21]
 

konva.js

@@ -2,7 +2,7 @@
  * Konva JavaScript Framework v2.0.3
  * http://konvajs.github.io/
  * Licensed under the MIT
- * Date: Mon Apr 30 2018
+ * Date: Fri May 04 2018
  *
  * Original work Copyright (C) 2011 - 2013 by Eric Rowell (KineticJS)
  * Modified work Copyright (C) 2014 - present by Anton Lavrenov (Konva)
@@ -18494,9 +18494,24 @@
       Konva.Line.prototype._sceneFunc.apply(this, arguments);
       var PI2 = Math.PI * 2;
       var points = this.points();
+
+      var tp = points;
+      var fromTension = this.getTension() !== 0 && points.length > 4;
+      if (fromTension) {
+        tp = this.getTensionPoints();
+      }
+
       var n = points.length;
-      var dx = points[n - 2] - points[n - 4];
-      var dy = points[n - 1] - points[n - 3];
+
+      var dx, dy;
+      if (fromTension) {
+        dx = points[n - 2] - tp[n - 2];
+        dy = points[n - 1] - tp[n - 1];
+      } else {
+        dx = points[n - 2] - points[n - 4];
+        dy = points[n - 1] - points[n - 3];
+      }
+
       var radians = (Math.atan2(dy, dx) + PI2) % PI2;
       var length = this.pointerLength();
       var width = this.pointerWidth();
@@ -18514,8 +18529,14 @@
       if (this.pointerAtBeginning()) {
         ctx.save();
         ctx.translate(points[0], points[1]);
+        if (fromTension) {
+          dx = tp[0] - points[0];
+          dy = tp[1] - points[1];
+        } else {
           dx = points[2] - points[0];
           dy = points[3] - points[1];
+        }
+
         ctx.rotate((Math.atan2(-dy, -dx) + PI2) % PI2);
         ctx.moveTo(0, 0);
         ctx.lineTo(-length, width / 2);

src/shapes/Arrow.js

@@ -37,9 +37,24 @@
       Konva.Line.prototype._sceneFunc.apply(this, arguments);
       var PI2 = Math.PI * 2;
       var points = this.points();
+
+      var tp = points;
+      var fromTension = this.getTension() !== 0 && points.length > 4;
+      if (fromTension) {
+        tp = this.getTensionPoints();
+      }
+
       var n = points.length;
-      var dx = points[n - 2] - points[n - 4];
-      var dy = points[n - 1] - points[n - 3];
+
+      var dx, dy;
+      if (fromTension) {
+        dx = points[n - 2] - tp[n - 2];
+        dy = points[n - 1] - tp[n - 1];
+      } else {
+        dx = points[n - 2] - points[n - 4];
+        dy = points[n - 1] - points[n - 3];
+      }
+
       var radians = (Math.atan2(dy, dx) + PI2) % PI2;
       var length = this.pointerLength();
       var width = this.pointerWidth();
@@ -57,8 +72,14 @@
       if (this.pointerAtBeginning()) {
         ctx.save();
         ctx.translate(points[0], points[1]);
+        if (fromTension) {
+          dx = tp[0] - points[0];
+          dy = tp[1] - points[1];
+        } else {
           dx = points[2] - points[0];
           dy = points[3] - points[1];
+        }
+
         ctx.rotate((Math.atan2(-dy, -dx) + PI2) % PI2);
         ctx.moveTo(0, 0);
         ctx.lineTo(-length, width / 2);

test/unit/shapes/Arrow-test.js

@@ -62,4 +62,27 @@ suite('Arrow', function() {
       'clearRect(0,0,578,200);save();transform(1,0,0,1,0,0);beginPath();moveTo(50,50);lineTo(100,100);setLineDash(5,5);lineDashOffset=0;lineWidth=5;strokeStyle=red;stroke();save();beginPath();translate(100,100);rotate(0.785);moveTo(0,0);lineTo(-20,10);lineTo(-20,-10);closePath();restore();setLineDash();fillStyle=blue;fill();lineWidth=5;strokeStyle=red;stroke();restore();'
     );
   });
+
+  test('direction with tension', function() {
+    var stage = addStage();
+    var layer = new Konva.Layer();
+
+    var arrow = new Konva.Arrow({
+      points: [50, 50, 100, 50, 100, 100],
+      stroke: 'red',
+      fill: 'red',
+      tension: 1,
+      pointerAtBeginning: true
+    });
+
+    layer.add(arrow);
+    stage.add(layer);
+
+    var trace = layer.getContext().getTrace();
+
+    assert.equal(
+      trace,
+      'clearRect(0,0,578,200);save();transform(1,0,0,1,0,0);beginPath();moveTo(50,50);quadraticCurveTo(75,25,100,50);quadraticCurveTo(125,75,100,100);lineWidth=2;strokeStyle=red;stroke();save();beginPath();translate(100,100);rotate(2.356);moveTo(0,0);lineTo(-10,5);lineTo(-10,-5);closePath();restore();save();translate(50,50);rotate(2.356);moveTo(0,0);lineTo(-10,5);lineTo(-10,-5);closePath();restore();setLineDash();fillStyle=red;fill();lineWidth=2;strokeStyle=red;stroke();restore();'
+    );
+  });
 });