bytev-charts/lib/plugin/three.js/examples/js/shaders/DotScreenShader.js

基于echarts和JavaScript及ES6封装的一个可以直接调用的图表组件库，内置主题设计，简单快捷，且支持用户自定义配置； npm 安装方式: npm install bytev-charts 若启动提示还需额外install插件,则运行 npm install @babel/runtime-corejs2 即可;

import "core-js/modules/es.array.join.js";
console.warn("THREE.DotScreenShader: As part of the transition to ES6 Modules, the files in 'examples/js' were deprecated in May 2020 (r117) and will be deleted in December 2020 (r124). You can find more information about developing using ES6 Modules in https://threejs.org/docs/#manual/en/introduction/Installation.");
/**
 * Dot screen shader
 * based on glfx.js sepia shader
 * https://github.com/evanw/glfx.js
 */

THREE.DotScreenShader = {
  uniforms: {
    "tDiffuse": {
      value: null
    },
    "tSize": {
      value: new THREE.Vector2(256, 256)
    },
    "center": {
      value: new THREE.Vector2(0.5, 0.5)
    },
    "angle": {
      value: 1.57
    },
    "scale": {
      value: 1.0
    }
  },
  vertexShader: ["varying vec2 vUv;", "void main() {", "	vUv = uv;", "	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );", "}"].join("\n"),
  fragmentShader: ["uniform vec2 center;", "uniform float angle;", "uniform float scale;", "uniform vec2 tSize;", "uniform sampler2D tDiffuse;", "varying vec2 vUv;", "float pattern() {", "	float s = sin( angle ), c = cos( angle );", "	vec2 tex = vUv * tSize - center;", "	vec2 point = vec2( c * tex.x - s * tex.y, s * tex.x + c * tex.y ) * scale;", "	return ( sin( point.x ) * sin( point.y ) ) * 4.0;", "}", "void main() {", "	vec4 color = texture2D( tDiffuse, vUv );", "	float average = ( color.r + color.g + color.b ) / 3.0;", "	gl_FragColor = vec4( vec3( average * 10.0 - 5.0 + pattern() ), color.a );", "}"].join("\n")
};