docs: 完善季风demo

examples/point/image/demo/meta.json

@@ -28,6 +28,11 @@
       "filename": "road.js",
       "title": "路线图",
       "screenshot": "https://gw.alipayobjects.com/mdn/rms_816329/afts/img/A*N-9MRZLlPXgAAAAAAAAAAAAAARQnAQ"
+    },
+    {
+      "filename": "monsoon.js",
+      "title": "季风分布",
+      "screenshot": "https://gw.alipayobjects.com/mdn/rms_816329/afts/img/A*Zq5ZTKNeU6sAAAAAAAAAAAAAARQnAQ"
     }
   ]
 }

examples/point/image/demo/monsoon.js

@@ -0,0 +1,82 @@
+import { Scene, PointLayer, LineLayer } from '@antv/l7';
+import { GaodeMap } from '@antv/l7-maps';
+
+const scene = new Scene({
+  id: 'map',
+  map: new GaodeMap({
+    pitch: 0,
+    style: 'dark',
+    center: [ 105, 35 ],
+    zoom: 2.5
+  })
+});
+
+
+scene.addImage(
+  'arrRed',
+  'https://gw.alipayobjects.com/mdn/rms_816329/afts/img/A*KWGqT6Oz50EAAAAAAAAAAAAAARQnAQ'
+);
+scene.addImage(
+  'arrBlue',
+  'https://gw.alipayobjects.com/mdn/rms_816329/afts/img/A*ZKhURq53OgIAAAAAAAAAAAAAARQnAQ'
+);
+
+scene.on('loaded', () => {
+
+fetch('https://gw.alipayobjects.com/os/bmw-prod/4c02515b-cb7a-47be-93cf-5596731ef982.json')
+.then(res => res.json()) 
+.then(monsoon => {
+    const { data, borderData } = monsoon
+    const imageLayer = new PointLayer()
+    .source(data)
+    .shape('wind', wind => {
+      if (wind === 'up') {
+        return 'arrBlue';
+      }
+      return 'arrRed';
+
+    })
+    .rotate('r', r => Math.PI * r)
+    .size(15)
+    .style({
+      rotation: 0,
+      layerType: 'fillImage'
+    });
+  scene.addLayer(imageLayer);
+
+
+  const border = new LineLayer()
+    .source(borderData)
+    .size(1.5)
+    .color('#575757')
+    .style({
+      lineType: 'dash',
+      dashArray: [ 5, 5 ]
+    });
+  scene.addLayer(border);
+
+  const text = new PointLayer({ zIndex: 2 })
+  .source([
+    { lng: 90, lat: 35, n: '非季风区' },
+    { lng: 125, lat: 30, n: '季风区' }
+  ], {
+    parser: {
+      type: 'json',
+      x: 'lng',
+      y: 'lat'
+    }
+  })
+  .shape('n', 'text')
+  .size(25)
+  .color('#575757')
+  .style({
+    spacing: 20
+  });
+
+  scene.addLayer(text);
+})
+
+  
+
+ 
+});