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JS Bin// source http://jsbin.com/jaqavetema
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width"> | |
| <title>JS Bin</title> | |
| </head> | |
| <body> | |
| <span id="pos"></span> | |
| <canvas id="myCanvas" width="1024" height="728"></canvas> | |
| <script> | |
| var span = document.getElementById('pos'); | |
| var canvas = document.getElementById('myCanvas'); | |
| var context = canvas.getContext('2d'); | |
| function getMousePos(canvas, evt) { | |
| var rect = canvas.getBoundingClientRect(); | |
| return { | |
| x: evt.clientX - rect.left, | |
| y: evt.clientY - rect.top | |
| }; | |
| } | |
| canvas.addEventListener('mousemove', function(evt) { | |
| var mousePos = getMousePos(canvas, evt); | |
| span.textContent = JSON.stringify(mousePos); | |
| context.lineTo(mousePos.x, mousePos.y); | |
| context.fillStyle = 'red'; | |
| context.fillRect(mousePos.x - 2, mousePos.y - 2, 5, 5); | |
| context.stroke(); | |
| }, false); | |
| </script> | |
| </body> | |
| </html> |
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