Arcgis 与 Pixi.js 可视化 glsl 特效篇(十七)

发布时间 2023-09-21 10:34:53作者: haibalai

这次我们用pixi.js和arcgis js结合

我们先定义一下 传入数据结构 symbol 暂时不做

  • let option = {
  • renderer: {
  • type: "simple",
  • symbol: {
  • }
  • },
  • data: [
  • {
  • geometry: [12956152.73135875, 4855356.473704897],
  • attributes: {
  • name: "北京"
  • }
  • },
  • {
  • geometry: [12697872.012783196, 2577456.5937789795],
  • attributes: {
  • name: "深圳"
  • }
  • }
  • ]
  • };

 

对于data 数据 ,
toScreen 方法参考链接提示
app 的构建参考 链接提示

  • let data = this.options.data;
  • for(let item of data){
  • //转换屏幕坐标,获取颜色,半径和线条粗细样式
  • let geo = item.geometry
  • let XY1 = toScreen(geo);
  • const geometry = new PIXI.Geometry()
  • .addAttribute("position", [100, 100, -100, 100, -100, -100, 100, -100, 200, 200], 2)
  • .addAttribute('uv', // the attribute name
  • [0, 0, // u, v
  • 1, 0, // u, v
  • 1, 1,
  • 0, 1], // u, v
  • 2)
  • .addIndex([0, 1, 2, 0, 2, 3]);
  • const fragmentShader = `
  • precision highp float;
  • uniform float iTime;
  • uniform vec2 iResolution;
  • varying vec2 vUv;
  • // Rand value between 0 and 1
  • float rand(vec2 p) {
  • return fract(sin(dot(p, vec2(12.543,514.123)))*4732.12);
  • }
  • // Value noise
  • float noise(vec2 p) {
  • vec2 f = smoothstep(0.0, 1.0, fract(p));
  • vec2 i = floor(p);
  • float a = rand(i);
  • float b = rand(i+vec2(1.0,0.0));
  • float c = rand(i+vec2(0.0,1.0));
  • float d = rand(i+vec2(1.0,1.0));
  • return mix(mix(a, b, f.x), mix(c, d, f.x), f.y);
  • }
  • // Fractal noise
  • float fbm(vec2 p) {
  • float a = 0.5;
  • float r = 0.0;
  • for (int i = 0; i < 8; i++) {
  • r += a*noise(p);
  • a *= 0.5;
  • p *= 2.0;
  • }
  • return r;
  • }
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