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POkineticjs - createImageRegion for pixels with opacity > 0 not only 1
 

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    <p>So the createImageRegion method ignores all pixels with a tiny bit of alpha/opacity. </p> <p>How can you make this function so that also pixels with an opacity of .5 or something will be count for hitdetection?</p> <p>I looked into KineticJS. A colorKey is added to a hitregion, but it transforms the key to a hex key with no alpha. I can't figure out a way how i could make this work.</p> <p>Help is much appriciated!</p> <p>this is where the magic happens. But i don't understand how i can include pixels whith any kind of transpanacy but 0</p> <pre><code>createImageHitRegion: function (callback) { var canvas = new Kinetic.Canvas(this.attrs.width, this.attrs.height); var context = canvas.getContext(); context.drawImage(this.attrs.image, 0, 0); try { var imageData = context.getImageData(0, 0, canvas.getWidth(), canvas.getHeight()); var data = imageData.data; var rgbColorKey = Kinetic.Type._hexToRgb(this.colorKey); // replace non transparent pixels with color key for (var i = 0, n = data.length; i &lt; n; i += 4) { data[i] = rgbColorKey.r; data[i + 1] = rgbColorKey.g; data[i + 2] = rgbColorKey.b; // i+3 is alpha (the fourth element) } var that = this; Kinetic.Type._getImage(imageData, function (imageObj) { that.imageHitRegion = imageObj; if (callback) { callback(); } }); } catch (e) { Kinetic.Global.warn('Unable to create image hit region. ' + e.message); } } </code></pre> <p>When i include: data[i + 3] = 255 (rgbColorKey.a) does not excist, none of the imageevents are working anymore</p>
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