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| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <body> | |
| <canvas width="960" height="500"></canvas> | |
| <script> | |
| let ctx = d3.select('canvas').node().getContext('2d'), | |
| numCol = 150, | |
| numRow = 150, | |
| shuffledIds = d3.shuffle(d3.range(0, numCol * numRow)), | |
| selectedIds = new Set(), | |
| addAmt = 0, | |
| spacing = 960.0 / numCol, | |
| squareSize = 5; | |
| function render() { | |
| ctx.clearRect(0, 0, ctx.canvas.clientWidth, ctx.canvas.clientHeight); | |
| addAmt += 1; | |
| for (let i = 0, amt = Math.min(shuffledIds.length, addAmt); i < amt; i++) { | |
| selectedIds.add(shuffledIds.pop()); | |
| } | |
| for (let i = 0; i < numCol; i++) { | |
| for (let j = 0; j < numRow; j++) { | |
| let id = i * numCol + j; | |
| if (selectedIds.has(id)) { | |
| ctx.fillStyle = d3.hsl((i * j) % 360, 0.8, 0.8).toString(); | |
| } else { | |
| ctx.fillStyle = "rgba(0, 0, 200, 0)"; | |
| } | |
| ctx.fillRect(i * spacing, j * spacing, squareSize, squareSize); | |
| } | |
| } | |
| window.requestAnimationFrame(render); | |
| } | |
| window.requestAnimationFrame(render); | |
| </script> | |
| </body> |
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