Arcgis 与 Pixi.js 可视化 glsl 特效篇（三十）

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 = `
• uniform float iTime;
• const vec2 iResolution = vec2(1.0,1.0);
• varying vec2 vUv;
• #define POINT_COUNT 8
• vec2 points[POINT_COUNT];
• const float speed = -0.5;
• const float len = 0.25;
• const float scale = 0.012;
• float intensity = 1.3;
• float radius = 0.015;
• //https://www.shadertoy.com/view/MlKcDD
• //Signed distance to a quadratic bezier
• float sdBezier(vec2 pos, vec2 A, vec2 B, vec2 C){
• vec2 a = B - A;
• vec2 b = A - 2.0*B + C;
• vec2 c = a * 2.0;
• vec2 d = A - pos;
• float kk = 1.0 / dot(b,b);
• float kx = kk * dot(a,b);
• float ky = kk * (2.0*dot(a,a)+dot(d,b)) / 3.0;
• float kz = kk * dot(d,a);
• float res = 0.0;
• float p = ky - kx*kx;
• float p3 = p*p*p;
• float q = kx*(2.0*kx*kx - 3.0*ky) + kz;
• float h = q*q + 4.0*p3;
• if(h >= 0.0){
• h = sqrt(h);

Arcgis 与 Pixi.js 可视化 glsl 特效篇（三十） － 小专栏