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var ctx = document.getElementById('tutorial').getContext('2d');
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var lineCap = ['butt','round','square'];
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// Draw guides
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ctx.save();
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ctx.strokeStyle = '#09f';
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ctx.beginPath();
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ctx.moveTo(10,10);
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ctx.lineTo(140,10);
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ctx.moveTo(10,140);
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ctx.lineTo(140,140);
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ctx.stroke();
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// Draw lines
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ctx.strokeStyle = 'black';
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for (i=0;i<lineCap.length;i++){
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ctx.lineWidth = 15;
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ctx.lineCap = lineCap[i];
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ctx.beginPath();
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ctx.moveTo(25+i*50,10);
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ctx.lineTo(25+i*50,140);
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ctx.stroke();
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}
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ctx.restore();
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