StackOverflow2013

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2013-07-16T19:06:24.077
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<p><strong>Html5 Canvas can do your indicator using it’s clipping capability</strong></p> <p><img src="https://i.stack.imgur.com/Sekq6.png" alt="enter image description here"><img src="https://i.stack.imgur.com/y8fFV.png" alt="enter image description here"></p> <p>Here’s the way it works:</p> <ul> <li>Put the canvas in a div.</li> <li>Tell the canvas where to position the indicator (the "Y" coordinate).</li> <li>Tell the canvas which image you want to clip inside your irregular canvas div.</li> </ul> <p>This is the function you call to change the canvas image and indicator:</p> <pre><code> drawCanvasDiv(indicatorYPosition,yourImage); </code></pre> <p>This is the code that draws the irregular box with the image clipped inside:</p> <p>Once you style your irregular canvas-div exactly as you like it…this code will not change.</p> <pre><code> function drawCanvasDiv(indicatorY,img){ ctx.save(); ctx.clearRect(0,0,w,h); // this call will define the path inside which the image will be clipped definePath(indicatorY); // clip any image inside the irregularly shaped path ctx.clip(); // draw your desired image ctx.drawImage(img,0,0,img.width,img.height); // finally draw the gray border of the irregular shape definePath(indicatorY); ctx.lineWidth=2; ctx.strokeStyle="lightgray"; ctx.stroke(); ctx.restore(); } </code></pre> <p>Here’s code and a Fiddle: <a href="http://jsfiddle.net/m1erickson/KYMFn/" rel="nofollow noreferrer">http://jsfiddle.net/m1erickson/KYMFn/</a></p> <pre><code><!doctype html> <html> <head> <link rel="stylesheet" type="text/css" media="all" href="css/reset.css" />  <script type="text/javascript" src="http://code.jquery.com/jquery.min.js"></script> <style> body{ background-color: ivory; padding:20px; } button{ margin:20px; } </style> <script> $(function(){ var canvas=document.getElementById("canvas"); var ctx=canvas.getContext("2d"); var canvasOffset=$("#canvas").offset(); var offsetX=canvasOffset.left; var offsetY=canvasOffset.top; var w=canvas.width; var h=canvas.height; var leftOffset=15; var indicatorHeight=20; var currentY=125; var img=new Image(); img.onload=function(){ drawCanvasDiv(currentY,img); } img.src="https://dl.dropboxusercontent.com/u/139992952/stackoverflow/skyGrass.png"; function drawCanvasDiv(indicatorY,img){ ctx.save(); ctx.clearRect(0,0,w,h); definePath(indicatorY); ctx.clip(); ctx.drawImage(img,0,0,img.width,img.height); definePath(indicatorY); ctx.lineWidth=2; ctx.strokeStyle="lightgray"; ctx.stroke(); ctx.restore(); } function definePath(indicatorY){ ctx.beginPath(); ctx.moveTo(leftOffset,0); ctx.lineTo(w,0); ctx.lineTo(w,h); ctx.lineTo(leftOffset,h); ctx.lineTo(leftOffset,indicatorY+indicatorHeight/2); ctx.lineTo(0,indicatorY); ctx.lineTo(leftOffset,indicatorY-indicatorHeight/2); ctx.closePath(); } $("#up").click(function(){ if(currentY-20-indicatorHeight/2>0){ currentY-=20; drawCanvasDiv(currentY,img); } }); $("#down").click(function(){ if(currentY+20+indicatorHeight/2<h){ currentY+=20; drawCanvasDiv(currentY,img); } }); }); // end $(function(){}); </script> </head> <body> <canvas id="canvas" width=300 height=248></canvas><br> <button id="up">Indicator Up</button> <button id="down">Indicator Down</button> </body> </html> </code></pre>
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1. POCreate a div with a triangular pointer on the left
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1. COWow.. you sir, is my savior. I am not using jQuery, but I can work it out from there. No hassle there.. Thanks a lot..
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