fix: heatmap render error (#1307)

* fix: 修复热力图渲染失效

* style: lint style

Co-authored-by: shihui <yiqianyao.yqy@alibaba-inc.com>

dev-demos/features/heatmap/heatmap.md

@@ -0,0 +1,2 @@
+### Heatmap
+<code src="./heatmap.tsx"></code>

dev-demos/features/heatmap/heatmap.tsx

@@ -0,0 +1,58 @@
+// @ts-ignore
+import { Scene, HeatmapLayer } from '@antv/l7';
+// @ts-ignore
+import { GaodeMap } from '@antv/l7-maps';
+import React, { useEffect } from 'react';
+
+export default () => {
+  useEffect(() => {
+    const scene = new Scene({
+      id: 'map',
+      map: new GaodeMap({
+        style: 'dark',
+        pitch: 0,
+        center: [127.5671666579043, 7.445038892195569],
+        zoom: 2.632456779444394,
+      }),
+    });
+
+    scene.on('loaded', () => {
+      fetch(
+        'https://gw.alipayobjects.com/os/basement_prod/d3564b06-670f-46ea-8edb-842f7010a7c6.json',
+      )
+        .then((res) => res.json())
+        .then((data) => {
+          const layer = new HeatmapLayer({})
+            .source(data)
+            .shape('heatmap')
+            .size('mag', [0, 1.0]) // weight映射通道
+            .style({
+              intensity: 2,
+              radius: 20,
+              opacity: 1.0,
+              rampColors: {
+                colors: [
+                  '#FF4818',
+                  '#F7B74A',
+                  '#FFF598',
+                  '#91EABC',
+                  '#2EA9A1',
+                  '#206C7C',
+                ].reverse(),
+                positions: [0, 0.2, 0.4, 0.6, 0.8, 1.0],
+              },
+            });
+          scene.addLayer(layer);
+        });
+    });
+  }, []);
+  return (
+    <div
+      id="map"
+      style={{
+        height: '500px',
+        position: 'relative',
+      }}
+    />
+  );
+};

packages/layers/src/heatmap/models/heatmap.ts

@@ -226,7 +226,7 @@ export default class HeatMapModel extends BaseModel {
         enable: false,
       },
       blend: this.getBlend(),
-      count: 6,
+      // count: 6,
       elements: createElements({
         data: [0, 2, 1, 2, 3, 1],
         type: gl.UNSIGNED_INT,