fix: polygon triangle

dev-demos/bugs/heatmap/demos/map.tsx

@@ -9,7 +9,7 @@ export default () => {
 
 const scene = new Scene({
     id: 'map',
-    map: new GaodeMap({
+    map: new Map({
       style: 'light',
       pitch: 0,
       center: [ 114.07737552216226, 22.542656745583486 ],

packages/site/docs/api/scene.zh.md

@@ -355,7 +355,9 @@ export interface ICameraOptions {
 type ICenter = [number, number];
 scene.setZoomAndCenter(zoom, center);
 ```
+
 ### setZoom(zoom: number): void 设置地图旋转
+
 设置地图缩放等级
 
 ```javascript

packages/utils/src/workers/triangulation.ts

@@ -64,11 +64,29 @@ export function PointFillTriangulation(feature: IEncodeFeature) {
 
 export function polygonFillTriangulation(feature: IEncodeFeature) {
   const { coordinates } = feature;
-  const flattengeo = earcut.flatten(coordinates as number[][][]);
+  // @ts-ignore
+  const flatCoord = coordinates.map((coord: number[][]) => coord.map((lnglat: [number, number]) => [lnglat[0], project_y(lnglat[1])]))
+  const flattengeo = earcut.flatten(flatCoord as number[][][]);
   const { vertices, dimensions, holes } = flattengeo;
+  // https://github.com/mapbox/earcut/issues/159
+  const triangles = earcut(vertices, holes, dimensions);
+  for (let i = 0; i < vertices.length; i += 2) {
+    vertices[i + 1] = un_project_y(vertices[i + 1]);
+  }
+
   return {
-    indices: earcut(vertices, holes, dimensions),
+    indices: triangles,
     vertices,
     size: dimensions,
   };
 }
+
+function project_y( y: number) {
+  return Math.log(Math.tan(Math.PI * y / 360))
+}
+
+function un_project_y( y: number) {
+
+  return Math.atan(Math.exp(y)) * 360 / Math.PI
+  
+}