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    <p><strong>How to draw a wedge containing an image which changes based on clicks/taps</strong></p> <p><img src="https://i.stack.imgur.com/DHEgu.png" alt="enter image description here"></p> <p>For your inner “wedge”, you can use a Kinetic.Group object and use the clipFunc to crop an image into a wedge</p> <p>Here’s the clipFunc for the image-wedge:</p> <pre><code> clipFunc: function(canvas) { var ctx = canvas.getContext(); var w=wedgeWidth; var h=wedgeHeight; var r=wedgeRadius; var angle1=0; // start at vertical var angle2=angle1+radianAngle; ctx.moveTo(cx,cy); ctx.arc(cx,cy,r,angle1,angle2,false); ctx.closePath(); } </code></pre> <p>radianAngle is the variable that controls the size of the wedge.</p> <p>You can set the radianAngle (and the wedge size) like this:</p> <pre><code>// if the user clicks/taps on the stage // redraw the image-wedge to the angle of the click/tap function setRadianAngle(touchX,touchY){ radianAngle=(Math.atan2(touchY-cy,touchX-cx)+Math.PI*2)%(Math.PI*2); layer.draw(); } </code></pre> <p>Here is code and a Fiddle: <a href="http://jsfiddle.net/m1erickson/DxZLJ/" rel="nofollow noreferrer">http://jsfiddle.net/m1erickson/DxZLJ/</a></p> <pre><code>&lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;meta charset="utf-8"&gt; &lt;title&gt;Prototype&lt;/title&gt; &lt;script type="text/javascript" src="http://code.jquery.com/jquery.min.js"&gt;&lt;/script&gt; &lt;script src="http://d3lp1msu2r81bx.cloudfront.net/kjs/js/lib/kinetic-v4.5.4.min.js"&gt;&lt;/script&gt; &lt;style&gt; #container{ border:solid 1px #ccc; margin-top: 10px; width:400px; height:400px; } &lt;/style&gt; &lt;script&gt; $(function(){ var stage = new Kinetic.Stage({ container: 'container', width: 400, height: 400 }); var layer = new Kinetic.Layer(); stage.add(layer); enableStageClick(); function enableStageClick(){ $(stage.getContent()).on('click tap', function (event) { var pos=stage.getMousePosition(); var mouseX=parseInt(pos.x); var mouseY=parseInt(pos.y); console.log(mouseX+"/"+mouseY); setRadianAngle(mouseX,mouseY); }); } var wedgeWidth=300; var wedgeHeight=300; var wedgeRadius=100; var borderRadius=20; var radianAngle=135*Math.PI/180; var cx=wedgeWidth/2; var cy=wedgeHeight/2; // create the outside "border" circle var border = new Kinetic.Circle({ x: wedgeWidth/2, y: wedgeHeight/2, radius: wedgeRadius+borderRadius, fill:"skyblue", stroke: "blue", strokeWidth: 5 }); layer.add(border); // create the inside "image-wedge" group var wedge=new Kinetic.Group({ x:0, y:0, width:wedgeWidth, height:wedgeHeight, // clip to a wedge with angle==degreeAngle off vertical clipFunc: function(canvas) { var ctx = canvas.getContext(); var w=wedgeWidth; var h=wedgeHeight; var r=wedgeRadius; var angle1=0; // start at vertical var angle2=angle1+radianAngle; ctx.moveTo(cx,cy); ctx.arc(cx,cy,r,angle1,angle2,false); ctx.closePath(); } }); layer.add(wedge); // create the image that will be clipped inside the wedge var image=new Kinetic.Image({ image:image, x:0, y:0, width:wedgeWidth, height:wedgeHeight, }); wedge.add(image); // load the image for the Kinetic Image object var img=new Image(); img.onload=function(){ image.setImage(img); layer.draw(); } img.src="https://dl.dropboxusercontent.com/u/139992952/stackoverflow/KoolAidMan.png"; // if the user clicks/taps on the stage // redraw the image-wedge to the angle of the click/tap function setRadianAngle(touchX,touchY){ radianAngle=(Math.atan2(touchY-cy,touchX-cx)+Math.PI*2)%(Math.PI*2); layer.draw(); } }); // end $(function(){}); &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;p&gt;Click/Touch to change angle of wedge-image&lt;/p&gt; &lt;div id="container"&gt;&lt;/div&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
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