Move the mouse smoothly from side to side to see a lag in the drawn position.
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March 6, 2017 15:30
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mouse delay canvas
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <body> | |
| <script src="http://d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 300; | |
| var canvas = d3.select("body").append("canvas") | |
| .attr("width", width) | |
| .attr("height", height); | |
| var context = canvas.node().getContext("2d"); | |
| context.fillStyle = 'steelblue'; | |
| var mouseLocation = [0,0]; | |
| d3.select(window).on("mousemove", () => { | |
| mouseLocation[0] = d3.event.clientX; | |
| mouseLocation[1] = d3.event.clientY; | |
| }); | |
| // show mouse | |
| d3.timer(function() { | |
| context.clearRect(0, 0, width, height); | |
| context.beginPath(); | |
| context.arc(mouseLocation[0], mouseLocation[1], 2, 0, 2 * Math.PI); | |
| context.fill(); | |
| }); | |
| </script> |
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