EchoZhaoH
/ douglasPeucker.js
Created
January 5, 2023 01:31
— forked from adammiller/douglasPeucker.js
Javascript implementation of the Douglas Peucker path simplification algorithm
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| var simplifyPath = function( points, tolerance ) { | |
| // helper classes | |
| var Vector = function( x, y ) { | |
| this.x = x; | |
| this.y = y; | |
| }; | |
| var Line = function( p1, p2 ) { | |
| this.p1 = p1; |
EchoZhaoH
/ typescript-array-reverse.ts
Last active
November 4, 2021 02:13
typescript array ArrayReverse
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| type ArrayReverse<T extends any[]> = T extends [infer A, ...infer B] ? [...ArrayReverse<B>, A] : T |
EchoZhaoH
/ web-fps-caculate.js
Created
August 19, 2021 01:14
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| const rAF = function() { | |
| return window.requestAnimationFrame || | |
| window.webkitRequestAnimationFrame || | |
| function (cb) { | |
| window.setTimeout(cb, 1000 / 60); | |
| } | |
| }(); | |
| let frame = 0 | |
| let lastTime = Date.now(); |
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| function drawCicle(diameter = 3, placeholder='*') { | |
| diameter = Math.floor(diameter) | |
| diameter = diameter < 3 ? 3 : diameter | |
| const mtx = matrix(diameter) | |
| return translate(mtx, placeholder) | |
| } | |
| function matrix(len) { | |
| const m = len | |
| const n = len |
EchoZhaoH
/ hear-dom.js
Created
August 13, 2021 09:45
— forked from zerobias/hear-dom.js
Hear DOM changes with WebAudio API
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| /* | |
| Copy this into the console of any web page that is interactive and doesn't | |
| do hard reloads. You will hear your DOM changes as different pitches of | |
| audio. | |
| I have found this interesting for debugging, but also fun to hear web pages | |
| render like UIs do in movies. | |
| */ | |
| const audioCtx = new (window.AudioContext || window.webkitAudioContext)() | |
| const observer = new MutationObserver(function(mutationsList) { |