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34 lines
842 B
JavaScript
34 lines
842 B
JavaScript
(function () {
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/**
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* Threshold Filter. Pushes any value above the mid point to
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* the max and any value below the mid point to the min.
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* This affects the alpha channel.
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* @function
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* @memberof Kinetic.Filters
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* @param {Object} imageData
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* @author ippo615
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*/
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Kinetic.Filters.Threshold = function (imageData) {
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var level = this.threshold() * 255,
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data = imageData.data,
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len = data.length,
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i;
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for (i = 0; i < len; i += 1) {
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data[i] = data[i] < level ? 0 : 255;
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}
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};
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Kinetic.Factory.addFilterGetterSetter(Kinetic.Node, 'threshold', 0.5);
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/**
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* get/set threshold. Must be a value between 0 and 1
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* @name threshold
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* @method
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* @memberof Kinetic.Node.prototype
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* @param {Number} threshold
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* @returns {Number}
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*/
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})(); |