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linecap.js Example File
script/context2d/scripts/linecap.js

 var ctx = document.getElementById('tutorial').getContext('2d');
   var lineCap = ['butt','round','square'];

   // Draw guides
   ctx.save();
   ctx.strokeStyle = '#09f';
   ctx.beginPath();
   ctx.moveTo(10,10);
   ctx.lineTo(140,10);
   ctx.moveTo(10,140);
   ctx.lineTo(140,140);
   ctx.stroke();

   // Draw lines
   ctx.strokeStyle = 'black';
   for (i=0;i<lineCap.length;i++){
     ctx.lineWidth = 15;
     ctx.lineCap = lineCap[i];
     ctx.beginPath();
     ctx.moveTo(25+i*50,10);
     ctx.lineTo(25+i*50,140);
     ctx.stroke();
   }
   ctx.restore();