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Input lag demo
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script> | |
| <style> | |
| body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } | |
| svg { width: 100%; height: 100%; } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| var margin = {top: 20, right: 10, bottom: 20, left: 10}; | |
| var width = 960 - margin.left - margin.right; | |
| var height = 500 - margin.top - margin.bottom; | |
| var circleRadius = 20; | |
| var delay = 100; // in ms | |
| var circleOffset = circleRadius; | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width + margin.left + margin.right) | |
| .attr("height", height + margin.top + margin.bottom) | |
| .append("g") | |
| .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
| var delays = [1, 5, 10, 20, 50, 100, 500, 1000, 2000]; | |
| var circle2 = svg.append('circle') | |
| .attr('cx', (width/2)-circleOffset) | |
| .attr('cy', (height/2)-circleOffset) | |
| .attr('r', circleRadius) | |
| .attr('fill', 'red') | |
| var circle1 = svg.append('circle') | |
| .attr('cx', (width/2)-circleOffset) | |
| .attr('cy', (height/2)-circleOffset) | |
| .attr('r', circleRadius) | |
| .attr('fill', 'gray') | |
| var ds = svg.selectAll('.delay') | |
| .data(delays) | |
| .enter() | |
| .append('g') | |
| .attr('class', 'delay') | |
| .attr('left', 100) | |
| .attr('top', 50) | |
| .attr('transform', function(d, i) { return 'translate(' + i*100 + ', 0)'; }) | |
| function updateButtons() { | |
| svg.selectAll('.delay') | |
| .select('text') | |
| .attr('fill', function(d) { return d === delay ? 'black' : 'lightblue' }) | |
| } | |
| ds.append('text') | |
| .text(function(d) { return d + ' ms'; }) | |
| .on('click', function(d) { | |
| delay = d; | |
| updateButtons(); | |
| }); | |
| svg.append('rect') | |
| .attr('height', height) | |
| .attr('width', width) | |
| .attr('opacity', 0) | |
| .on('mousemove', function() { | |
| var start = performance.now(); | |
| var x = d3.event.x; | |
| var y = d3.event.y; | |
| circle1.attr('cx', x - circleOffset/2) | |
| circle1.attr('cy', y - circleOffset) | |
| var step = function(timestamp) { | |
| if (timestamp-start < delay) { | |
| window.requestAnimationFrame(step); | |
| } else { | |
| circle2.attr('cx', x - circleOffset/2); | |
| circle2.attr('cy', y - circleOffset); | |
| } | |
| } | |
| window.requestAnimationFrame(step); | |
| }) | |
| updateButtons(); | |
| </script> | |
| </body> |
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