Created
December 19, 2019 10:28
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| .bar { | |
| border: solid 1px rgba(0, 0, 0, 0.3); | |
| } |
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| class Bar { | |
| constructor(canvas) { | |
| this.segments = []; | |
| this.canvas = canvas; | |
| canvas.classList.add("bar"); | |
| this.width = canvas.width; | |
| this.height = canvas.height; | |
| this.ctx = canvas.getContext("2d"); | |
| } | |
| display(segments) { | |
| if (!segments) segments = this.segments; | |
| let offset = 0; | |
| this.ctx.clearRect(0, 0, this.width, this.height); | |
| for (let segment of segments) { | |
| const w = this.width * segment.size; | |
| this.ctx.fillStyle = segment.color || "#000000"; | |
| this.ctx.fillRect(offset, 0, w, this.height); | |
| offset += w; | |
| } | |
| } | |
| step(segments, duration, start, t) { | |
| const displaySegments = []; | |
| for (let i = 0; i < this.segments.length; ++i) { | |
| const a = this.segments[i].size; | |
| const b = segments[i].size; | |
| displaySegments.push({ | |
| label: this.segments[i].label, | |
| size: Bar.lerp(a, b, (t - start) / duration), | |
| color: this.segments[i].color, | |
| }); | |
| } | |
| this.display(displaySegments); | |
| if (t - start < duration) { | |
| window.requestAnimationFrame(() => { | |
| this.step(segments, duration, start, Date.now()); | |
| }); | |
| } | |
| } | |
| animate(segments, duration) { | |
| this.step(segments, duration, Date.now(), Date.now()); | |
| } | |
| static lerp(a, b, t) { | |
| return a + t * (b - a); | |
| } | |
| } |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"/> | |
| <title>KMMP</title> | |
| <script src="bar.js"></script> | |
| <link rel="stylesheet" href="bar.css"/> | |
| </head> | |
| <body> | |
| <h1>KMMP</h1> | |
| <canvas id="canvas" width="720" height="70"></canvas> | |
| <script src="main.js"></script> | |
| </body> | |
| </html> |
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| const canvas = document.getElementById("canvas"); | |
| const bar = new Bar(canvas); | |
| bar.segments.push({ | |
| label: "Crap", | |
| size: 0.3, | |
| color: "#C9171E", | |
| }); | |
| bar.segments.push({ | |
| label: "Dem", | |
| size: 0.5, | |
| color: "#004ea1", | |
| }); | |
| bar.segments.push({ | |
| label: "Peoples", | |
| size: 0.2, | |
| color: "#006241", | |
| }); | |
| bar.display(); | |
| bar.animate([ | |
| { size: 0.1 }, | |
| { size: 0.5 }, | |
| { size: 0.4 } | |
| ], 5000); |
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