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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,148 @@ | ||
| /* | ||
| * File Name / glitteringSea.js | ||
| * Created Date / Aug 14, 2020 | ||
| * Aurhor / Toshiya Marukubo | ||
| * Twitter / https://twitter.com/toshiyamarukubo | ||
| */ | ||
|
|
||
| (function () { | ||
| 'use strict'; | ||
| window.addEventListener('load', function () { | ||
| var canvas = document.getElementById('canvas'); | ||
|
|
||
| if (!canvas || !canvas.getContext) { | ||
| return false; | ||
| } | ||
|
|
||
| /******************** | ||
| Random Number | ||
| ********************/ | ||
|
|
||
| function rand(min, max) { | ||
| return Math.floor(Math.random() * (max - min + 1) + min); | ||
| } | ||
|
|
||
| /******************** | ||
| Var | ||
| ********************/ | ||
|
|
||
| var ctx = canvas.getContext('2d'); | ||
| var X = canvas.width = window.innerWidth; | ||
| var Y = canvas.height = window.innerHeight; | ||
| var mouseX = null; | ||
| var mouseY = null; | ||
| var shapeNum = 300; | ||
| var shapes = []; | ||
| var style = { | ||
| black: 'black', | ||
| white: 'white', | ||
| lineWidth: 4, | ||
| }; | ||
|
|
||
| /******************** | ||
| Animation | ||
| ********************/ | ||
|
|
||
| window.requestAnimationFrame = | ||
| window.requestAnimationFrame || | ||
| window.mozRequestAnimationFrame || | ||
| window.webkitRequestAnimationFrame || | ||
| window.msRequestAnimationFrame || | ||
| function(cb) { | ||
| setTimeout(cb, 17); | ||
| }; | ||
|
|
||
| /******************** | ||
| Shape | ||
| ********************/ | ||
|
|
||
| function Shape(ctx, x, y) { | ||
| this.ctx = ctx; | ||
| this.init(x, y); | ||
| } | ||
|
|
||
| Shape.prototype.init = function(x, y) { | ||
| this.x = x; | ||
| this.y = y; | ||
| this.r = rand(10, 25); | ||
| this.ga = Math.random() * .45; | ||
| this.v = { | ||
| x: Math.random(), | ||
| y: -1 | ||
| }; | ||
| this.l = rand(0, 20); | ||
| this.sl = this.l; | ||
| }; | ||
|
|
||
| Shape.prototype.updateParams = function() { | ||
| var ratio = this.l / this.sl; | ||
| //this.r *= ratio; | ||
| this.l -= 1; | ||
| if (this.l < 0) { | ||
| this.init(X * Math.random() , rand(0, Y)); | ||
| } | ||
| }; | ||
|
|
||
| Shape.prototype.updatePosition = function() { | ||
| this.x += Math.random(); | ||
| this.y += -Math.random(); | ||
| }; | ||
|
|
||
| Shape.prototype.draw = function() { | ||
| var ctx = this.ctx; | ||
| ctx.save(); | ||
| ctx.globalCompositeOperation = 'lighter'; | ||
| ctx.globalAlpha = this.ga; | ||
| //ctx.fillStyle = 'rgb(123, 252, 100)'; | ||
| ctx.fillStyle = 'white'; | ||
| ctx.beginPath(); | ||
| ctx.arc(this.x, this.y, this.r, 0, Math.PI * 2, false); | ||
| ctx.fill(); | ||
| ctx.restore(); | ||
| }; | ||
|
|
||
| Shape.prototype.render = function(i) { | ||
| this.updatePosition(); | ||
| this.updateParams(); | ||
| this.draw(); | ||
| }; | ||
|
|
||
| for (var i = 0; i < shapeNum; i++) { | ||
| var s = new Shape(ctx, X * Math.random(), rand(0, Y)); | ||
| shapes.push(s); | ||
| } | ||
|
|
||
| /******************** | ||
| Render | ||
| ********************/ | ||
|
|
||
| function render() { | ||
| ctx.clearRect(0, 0, X, Y); | ||
| for (var i = 0; i < shapes.length; i++) { | ||
| shapes[i].render(i); | ||
| } | ||
| requestAnimationFrame(render); | ||
| } | ||
|
|
||
| render(); | ||
|
|
||
| /******************** | ||
| Event | ||
| ********************/ | ||
|
|
||
| function onResize() { | ||
| X = canvas.width = window.innerWidth; | ||
| Y = canvas.height = window.innerHeight; | ||
| } | ||
|
|
||
| window.addEventListener('resize', function() { | ||
| onResize(); | ||
| }); | ||
|
|
||
| window.addEventListener('mousemove', function(e) { | ||
| mouseX = e.clientX; | ||
| mouseY = e.clientY; | ||
| }, false); | ||
|
|
||
| }); | ||
| })(); |