Created
January 6, 2015 11:14
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Save Pearyman/a23a4008b83a682d87c1 to your computer and use it in GitHub Desktop.
// source http://jsbin.com/dunahe
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>JS Bin</title> | |
| </head> | |
| <body> | |
| <canvas id="myCanvas" width="600" height="600"></canvas> | |
| <script type="text/javascript"> | |
| var c=document.getElementById("myCanvas"); | |
| var ctx=c.getContext("2d"); | |
| ctx.fillStyle="#000"; | |
| ctx.fillRect(0,0,600,600); | |
| var onoff=false; | |
| var oldx=-10; | |
| var oldy=-10; | |
| var lineColor="#fff"; | |
| var linw="4"; | |
| c.addEventListener("mousemove",draw,true); | |
| c.addEventListener("mousedown",down,false); | |
| c.addEventListener("mouseup",up,false); | |
| function down(event){ | |
| onoff=true; | |
| oldx=event.pageX-10; | |
| oldy=event.pageY-10; | |
| } | |
| function up(){ | |
| onoff=false; | |
| } | |
| function draw(event){ | |
| if(onoff==true){ | |
| var newx=event.pageX-10; | |
| var newy=event.pageY-10; | |
| ctx.beginPath(); | |
| ctx.moveTo(oldx,oldy); | |
| ctx.lineTo(newx,newy); | |
| ctx.strokeStyle=lineColor; | |
| ctx.lineWidth=linw; | |
| ctx.lineCap="round"; | |
| ctx.stroke(); | |
| oldx=newx; | |
| oldy=newy; | |
| } | |
| } | |
| </script> | |
| </body> | |
| </html> |
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