docs: `PolygonLayer` doc (#910)

docs/api/polygon_layer/polygonlayer.zh.md

@@ -5,6 +5,8 @@ order: 0
 
 `markdown:docs/common/style.md`
 
+## 简介
+
 绘制 2D 多边形以及沿 Z 轴拉伸后的 3D 图形。
 
 ## 使用
@@ -13,18 +15,139 @@ order: 0
 import { PolygonLayer } from '@antv/l7';
 ```
 
-## shape
+## shape 类型
 
-填充图支持 3 种 shape
+`PolygonLayer` 填充图支持 3 种 shape
+
+**填充面**
 
 - fill 绘制填充面 不支持数据映射
-- line 绘制填充图描边 不支持数据映射
+
-- extrude 对填充图 3D 拉伸 不支持数据映射
+<img width="60%" style="display: block;margin: 0 auto;" alt="面图层填充图" src="https://gw.alipayobjects.com/mdn/rms_816329/afts/img/A*v5dZT4Q1dgsAAAAAAAAAAAAAARQnAQ">
+
 
 ```javascript
-PolyonLayer.shape('fill');
+
-PolyonLayer.shape('line').size(1); // size 表示线宽度
+import { Scene, PolygonLayer } from '@antv/l7';
-PolyonLayer.shape('extrude').size(10); // size 表示高度
+import { Mapbox } from '@antv/l7-maps';
+
+const scene = new Scene({
+  id: 'map',
+  map: new Mapbox({
+    pitch: 0,
+    style: 'blank',
+    center: [ 116.368652, 39.93866 ],
+    zoom: 10.07
+  })
+});
+scene.on('loaded', () => {
+  fetch(
+    'https://gw.alipayobjects.com/os/bmw-prod/d6da7ac1-8b4f-4a55-93ea-e81aa08f0cf3.json'
+  )
+    .then(res => res.json())
+    .then(data => {
+      const chinaPolygonLayer = new PolygonLayer({
+        autoFit: true
+      })
+        .source(data)
+        .color('red')
+        .shape('fill')
+        .style({
+          opacity: 1
+        });
+
+      scene.addLayer(chinaPolygonLayer);
+    });
+});
+```
+**填充图描边**
+- line 绘制填充图描边 不支持数据映射
+
+<img width="60%" style="display: block;margin: 0 auto;" alt="面图层填充图" src="https://gw.alipayobjects.com/mdn/rms_816329/afts/img/A*KSlPQ6MCu4sAAAAAAAAAAAAAARQnAQ">
+
+```javascript
+import { Scene, PolygonLayer } from '@antv/l7';
+import { Mapbox } from '@antv/l7-maps';
+
+const scene = new Scene({
+  id: 'map',
+  map: new Mapbox({
+    pitch: 0,
+    style: 'blank',
+    center: [ 116.368652, 39.93866 ],
+    zoom: 10.07
+  })
+});
+scene.on('loaded', () => {
+  fetch(
+    'https://gw.alipayobjects.com/os/bmw-prod/d6da7ac1-8b4f-4a55-93ea-e81aa08f0cf3.json'
+  )
+    .then(res => res.json())
+    .then(data => {
+      const chinaPolygonLayer = new PolygonLayer({
+        autoFit: true
+      })
+        .source(data)
+        .color('#000')
+        .shape('line')
+        .style({
+          opacity: 1
+        });
+
+      scene.addLayer(chinaPolygonLayer);
+    });
+});
+```
+
+
+**3D 填充图**
+- extrude 对填充图 3D 拉伸 不支持数据映射
+
+<img width="60%" style="display: block;margin: 0 auto;" alt="面图层填充图" src="https://gw.alipayobjects.com/mdn/rms_816329/afts/img/A*vcN8TptUA1cAAAAAAAAAAAAAARQnAQ">
+
+```javascript
+import { Scene, PolygonLayer } from '@antv/l7';
+import { Mapbox } from '@antv/l7-maps';
+
+const scene = new Scene({
+  id: 'map',
+  map: new Mapbox({
+    pitch: 0,
+    style: 'blank',
+    center: [ 116.368652, 39.93866 ],
+    zoom: 10.07
+  })
+});
+scene.on('loaded', () => {
+  fetch(
+    'https://gw.alipayobjects.com/os/bmw-prod/d6da7ac1-8b4f-4a55-93ea-e81aa08f0cf3.json'
+  )
+    .then(res => res.json())
+    .then(data => {
+      const chinaPolygonLayer = new PolygonLayer({
+        autoFit: true
+      })
+        .source(data)
+        .color(
+          'name',
+          [
+            'rgb(239,243,255)',
+            'rgb(189,215,231)',
+            'rgb(107,174,214)',
+            'rgb(49,130,189)',
+            'rgb(8,81,156)'
+          ]
+        )
+        .shape('extrude')
+        .size('childrenNum', (num) => num * 10000)
+        .style({
+          opacity: 1
+        });
+
+      scene.addLayer(chinaPolygonLayer);
+    });
+});
+
 ```
 
 `markdown:docs/common/layer/base.md`