Created
June 1, 2018 15:20
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cubes
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| <html> | |
| <body> | |
| <canvas id="canvas" width="400" height="400" /> | |
| </body> | |
| <script src="build/app.js"></script> | |
| <script type="text/javascript"> | |
| var canvas = document.getElementById("canvas"); | |
| var ctx = canvas.getContext("2d"); | |
| var scaleFactor = 20; | |
| ctx.scale(scaleFactor, scaleFactor); | |
| ctx.translate(0, 3); | |
| Iso.cube(ctx, 1, 1, Iso.Color.blue); | |
| ctx.translate(0, -1); | |
| Iso.cube(ctx, 1, 1, Iso.Color.green); | |
| ctx.translate(0, -1); | |
| Iso.cube(ctx, 1, 1, Iso.Color.red); | |
| ctx.translate(0, -1); | |
| ctx.scale(1 / scaleFactor, 1 / scaleFactor); | |
| </script> | |
| </html> |
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| namespace Iso { | |
| function lface(ctx: CanvasRenderingContext2D, width: number, height: number) { | |
| ctx.beginPath(); | |
| ctx.moveTo(0, 0); | |
| ctx.lineTo(width, width / 2); | |
| ctx.lineTo(width, height + width / 2); | |
| ctx.lineTo(0, height); | |
| ctx.closePath(); | |
| ctx.fill(); | |
| } | |
| export function rface(ctx: CanvasRenderingContext2D, width: number, height: number) { | |
| ctx.scale(-1, 1); | |
| lface(ctx, width, height); | |
| ctx.scale(-1, 1); | |
| } | |
| function lid(ctx: CanvasRenderingContext2D, width: number, height: number) { | |
| ctx.beginPath(); | |
| ctx.moveTo(0, 0); | |
| ctx.lineTo(width, width / 2); | |
| ctx.lineTo(width * 2, 0); | |
| ctx.lineTo(width, -width / 2); | |
| ctx.closePath(); | |
| ctx.fill(); | |
| } | |
| export function cube(ctx: CanvasRenderingContext2D, faceWidth: number, faceHeight: number, color: Color) { | |
| let old = ctx.fillStyle; | |
| ctx.fillStyle = color.scaledBy(0.9).toString(); | |
| lface(ctx, faceWidth, faceHeight); | |
| ctx.translate(faceWidth * 2, 0); | |
| ctx.fillStyle = color.scaledBy(0.8).toString(); | |
| rface(ctx, faceWidth, faceHeight); | |
| ctx.translate(-faceWidth * 2, 0); | |
| ctx.fillStyle = color.toString(); | |
| lid(ctx, faceWidth, faceHeight); | |
| ctx.fillStyle = old; | |
| } | |
| export class Color { | |
| static red = new Color(255, 0, 0); | |
| static green = new Color(0, 255, 0); | |
| static blue = new Color(0, 0, 255); | |
| constructor(public r: number, public g: number, public b: number) { | |
| this.r = Math.min(255, r); | |
| this.g = Math.min(255, g); | |
| this.b = Math.min(255, b); | |
| } | |
| toString(): string { | |
| function hex(n: number): string { | |
| var s = n.toString(16); | |
| while (s.length < 2) s = "0" + s; | |
| return s; | |
| } | |
| let result = "#" + hex(this.r) + hex(this.g) + hex(this.b); | |
| console.log(result); | |
| return result; | |
| } | |
| scaledBy(scale: number): Color { | |
| return new Color(Math.round(this.r * scale), Math.round(this.g * scale), Math.round(this.b * scale)); | |
| } | |
| } | |
| } |
Author
jmcd
commented
Jun 4, 2018
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