canvas+webgl实现鼠标交互变形动画效果代码-html代码-BFW代码库

canvas+webgl实现鼠标交互变形动画效果代码

代码语言：html

所属分类：动画

代码描述：canvas+webgl实现鼠标交互变形动画效果代码

下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开

<!DOCTYPE html>
<html lang="en" >

<head>
  <meta charset="UTF-8">
  


  
  
<style>
body {
  background-color: #000;
  margin: 0;
  overflow: hidden;
  background-repeat: no-repeat;
}

canvas {
  position: absolute;
}
</style>


  
  
</head>

<body>
  
  
      <script >
"use strict";

let canv, gl;
let maxx, maxy;
let midx, midy;

let widthHandle, heightHandle;
let c0Handle;
let mousePos = {};
let algo, algoHandle;
let orb, orbHandle;
let auto = false,
autoLevel = 0; // 0: mouse driven, 1 : automatic motion
let timeLastMove;
let reqCoords;
let animState = 0;

const mrandom = Math.random;
const mfloor = Math.floor;
const mround = Math.round;
const mceil = Math.ceil;
const mabs = Math.abs;
const mmin = Math.min;
const mmax = Math.max;

const mPI = Math.PI;
const mPIS2 = Math.PI / 2;
const m2PI = Math.PI * 2;
const msin = Math.sin;
const mcos = Math.cos;
const matan2 = Math.atan2;

const mhypot = Math.hypot;
const msqrt = Math.sqrt;

//-----------------------------------------------------------------------------
// miscellaneous functions
//-----------------------------------------------------------------------------

function alea(min, max) {
  // random number [min..max[ . If no max is provided, [0..min[

  if (typeof max == "undefined") return min * mrandom();
  return min + (max - min) * mrandom();
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

function intAlea(min, max) {
  // random integer number [min..max[ . If no max is provided, [0..min[

  if (typeof max == "undefined") {
    max = min;
    min = 0;
  }
  return mfloor(min + (max - min) * mrandom());
} // intAlea

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
function lerp(p0, p1, alpha) {
  return {
    x: (1 - alpha) * p0.x + alpha * p1.x,
    y: (1 - alpha) * p0.y + alpha * p1.y };

} // function lerp

//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------

//************** Shader sources **************
const R = 0.2;
const A = -3.0; // < 0; heart tip  is at (0, A *R);
// values used by shader but easier to calculate in JS
// junction point between circle and straight line
const X0 = 2 * A * A / (A * A + 1) * R;
const Y0 = X0 / A;
const PA = 2 * A / (A * A - 1); // slope of perp. to straight line
const PB = -1 / PA; // slope of straight Line
const LNG = mhypot(X0, A * R - Y0); // length of straight line

let vertexSource = `
attribute vec2 position;

void main() {
  gl_Position = vec4(position, 0.0, 1.0);
}
`;

let fragmentSource = `

 precision mediump float;

 #define ITER_MAX 100

 uniform float width;
 uniform float height;
 uniform vec2 c0; // constant in Julia iterative formula
 uniform int algo;
 uniform vec2 orb;

 vec2 iResolution;
 vec2 z;

void main(){

  iResolution = vec2(width, height);

  float dist, thismin;

  float zoom = 1.0;     // defines width of displayed area in the complex plane
  float factor =.........完整代码请登录后点击上方下载按钮下载查看