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January 31, 2020 14:12
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Snow
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Snow</title> | |
| </head> | |
| <body style="margin: 0;"> | |
| <canvas id="canvas"></canvas> | |
| <script type="text/javascript" src="tool.js"></script> | |
| <script type="text/javascript" src="vector.js"></script> | |
| <script type="text/javascript" src="snow.js"></script> | |
| <script type="text/javascript" src="script.js"></script> | |
| </body> | |
| </html> |
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| let c, ctx, w, h; | |
| let snows = []; | |
| let nOfSnows = 150; | |
| let gravity; | |
| function setup() { | |
| c = document.querySelector('#canvas'); | |
| c.width = window.innerWidth; | |
| c.height = window.innerHeight; | |
| ctx = c.getContext('2d'); | |
| w = c.width; | |
| h = c.height; | |
| for (let i = 0; i < nOfSnows; i++) { | |
| let snow = new Snow(random(0, w), random(0, h)); | |
| snows.push(snow); | |
| } | |
| } | |
| function draw() { | |
| ctx.fillStyle = 'rgb(70, 0, 0)'; | |
| ctx.fillRect(0, 0, w, h); | |
| for (let snow of snows) { | |
| snow.fall(); | |
| snow.draw(ctx); | |
| } | |
| window.requestAnimationFrame(draw); | |
| } | |
| setup(); | |
| window.requestAnimationFrame(draw); |
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| class Snow { | |
| constructor(x, y) { | |
| this.pos = new Vector(x, y); | |
| this.r = random(10, 30) * 0.1; | |
| this.vel = new Vector(random(3, 10) * 0.1, random(5, 10) * 0.1); | |
| this.isSimple = !!random(0, 1); | |
| this.img = new Image(); | |
| this.img.src = 'snowflake.png'; | |
| this.snowSize = random(5, 10); | |
| } | |
| fall() { | |
| this.pos.add(this.vel); | |
| if (this.pos.x > w) this.pos.x = 0; | |
| if (this.pos.y > h) this.pos.y = 0; | |
| } | |
| draw(ctx) { | |
| if (this.isSimple) { | |
| ctx.save(); | |
| ctx.beginPath(); | |
| ctx.arc(this.pos.x, this.pos.y, this.r, 0, Math.PI * 2); | |
| ctx.fillStyle = 'white'; | |
| ctx.fill(); | |
| ctx.restore(); | |
| } else { | |
| ctx.save(); | |
| ctx.drawImage(this.img, this.pos.x, this.pos.y, this.snowSize, this.snowSize); | |
| ctx.restore(); | |
| } | |
| } | |
| } |
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| function random(min, max) { | |
| min = Math.ceil(min); | |
| max = Math.floor(max); | |
| return Math.floor(Math.random() * (max - min + 1)) + min; //The maximum is inclusive and the minimum is inclusive | |
| } |
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| class Vector { | |
| constructor(x, y) { | |
| this.x = x; | |
| this.y = y; | |
| } | |
| add(vec) { | |
| this.x += vec.x; | |
| this.y += vec.y; | |
| } | |
| } |
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