Arcgis 与 Pixi.js 可视化 glsl 特效篇（二十六）

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 PASS_COUNT 1
• vec4 iMouse = vec4(.0, 0, 0.2, 0);
• float fBrightness = 2.5;
• // Number of angular segments
• float fSteps = 121.0;
• float fParticleSize = 0.015;
• float fParticleLength = 0.5 / 60.0;
• // Min and Max star position radius. Min must be present to prevent stars too near camera
• float fMinDist = 0.8;
• float fMaxDist = 5.0;
• float fRepeatMin = 1.0;
• float fRepeatMax = 2.0;
• // fog density
• float fDepthFade = 0.8;
• float Random(float x)
• {
• return fract(sin(x * 123.456) * 23.4567 + sin(x * 345.678) * 45.6789 + sin(x * 456.789) * 56.789);
• }
• vec3 GetParticleColour( const in vec3 vParticlePos, const in float fParticleSize, const in vec3 vRayDir )
• {
• vec2 vNormDir = normalize(vRayDir.xy);
• float d1 = dot(vParticlePos.xy, vNormDir.xy) / length(vRayDir.xy);
• vec3 vClosest2d = vRayDir * d1;

Arcgis 与 Pixi.js 可视化 glsl 特效篇（二十六） － 小专栏