Created
April 21, 2019 13:46
-
-
Save wintercn/dfb37731da46eb860a0b2a69b42a4b27 to your computer and use it in GitHub Desktop.
tang.js
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <meta charset="utf-8"> | |
| <body style="text-align:center"> | |
| <canvas width="1000" height="1000" style="background:black;margin:auto;"> | |
| </canvas> | |
| <script src="tang.js"> | |
| </script> | |
| </body> |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| var canvas = document.getElementsByTagName("canvas")[0]; | |
| var context = canvas.getContext("2d"); | |
| var g = 0.000000003; | |
| var size = 0; | |
| function sleep(t){ | |
| return new Promise(resolve => { | |
| setTimeout(resolve, t); | |
| }); | |
| } | |
| function nextTick(){ | |
| return new Promise(resolve => { | |
| requestAnimationFrame(resolve); | |
| }); | |
| } | |
| async function createSprite(color, p, v, t){ | |
| let begin = Date.now(); | |
| let dt; | |
| while( (dt = Date.now() - begin) < t) { | |
| context.fillStyle = color; | |
| context.clearRect(p[0]-1, p[1]-1 , 7, 7); | |
| context.fillRect(p[0] += (v[0] * dt), p[1] += (v[1] * dt), 5, 5); | |
| v[1] += g * t | |
| await nextTick(); | |
| } | |
| context.clearRect(p[0]-1, p[1]-1 , 6, 6); | |
| } | |
| function boom(p){ | |
| let v = 0.001 | |
| for(let i = 0; i < 15; i ++) { | |
| let angel = Math.random() * Math.PI * 2; | |
| createSprite(randomColor(), p.slice(), [Math.sin(angel) * v, Math.cos(angel)*v], 3000 + Math.random() * 1000); | |
| } | |
| } | |
| async function start(){ | |
| let width = 1000; | |
| let height = 500; | |
| drawName() | |
| while(true) { | |
| await sleep(1500); | |
| for(let j = 0; j < 15; j ++) { | |
| boom([(Math.random()* width), (Math.random()* height)]); | |
| } | |
| } | |
| } | |
| async function drawName(){ | |
| while(true) { | |
| context.fillStyle = "pink"; | |
| context.font = "bold 50px arial"; | |
| context.fillText("Tang ❤ Maggie", 330, 300); | |
| await nextTick(); | |
| } | |
| } | |
| start(); | |
| function randomColor(){ | |
| var r = Math.floor(Math.random() * 127 + 128).toString(16); | |
| r.length == 2 || (r = "0" + r); | |
| var g = Math.floor(Math.random() * 127 + 128).toString(16); | |
| g.length == 2 || (g = "0" + g); | |
| var b = Math.floor(Math.random() * 127 + 128).toString(16); | |
| b.length == 2 || (b = "0" + b); | |
| return "#" + r + g + b; | |
| } |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment