mirror of https://gitee.com/antv-l7/antv-l7
81 lines
2.2 KiB
Markdown
81 lines
2.2 KiB
Markdown
---
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title: 路径图
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order: 0
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---
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<embed src="@/docs/common/style.md"></embed>
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我们经常需要在地图上绘制诸如道路、行动路线、水系等常见的路径，可以将这些绘制线的统称为路径图，即用一组首尾不闭合的点坐标对来定位的线图层。
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<div>
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<div style="width:60%;float:left; margin: 10px;">
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<img width="80%" alt="案例" src='https://gw.alipayobjects.com/mdn/rms_816329/afts/img/A*KEupSZ_p0pYAAAAAAAAAAAAAARQnAQ'>
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</div>
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</div>
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### 实现
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下面我们来介绍如何绘制一个常见的路径图。
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- 你可以在 `L7` 官网上找到[在线案例](/examples/gallery/animate#animate_path_texture)
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```javascript
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import { Scene, LineLayer } from '@antv/l7';
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import { GaodeMap } from '@antv/l7-maps';
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const scene = new Scene({
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id: 'map',
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map: new GaodeMap({
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center: [ 120.15, 30.246 ],
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zoom: 13.5,
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style: 'dark',
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rotation: -90
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})
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});
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scene.addImage('arrow', 'https://gw.alipayobjects.com/zos/bmw-prod/ce83fc30-701f-415b-9750-4b146f4b3dd6.svg');
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fetch('https://gw.alipayobjects.com/os/basement_prod/40ef2173-df66-4154-a8c0-785e93a5f18e.json')
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.then(res => res.json())
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.then(data => {
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const layer = new LineLayer({})
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.source(data)
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.size(3)
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.shape('line')
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.texture('arrow')
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.color('rgb(22,119,255)')
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.animate({
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interval: 1, // 间隔
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duration: 1, // 持续时间，延时
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trailLength: 2 // 流线长度
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})
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.style({
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opacity: 0.6,
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lineTexture: true, // 开启线的贴图功能
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iconStep: 10, // 设置贴图纹理的间距
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borderWidth: 0.4, // 默认文 0，最大有效值为 0.5
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borderColor: '#fff' // 默认为 #ccc
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});
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scene.addLayer(layer);
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});
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```
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### shape
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我们一般将路径图的 `shape` 参数设置成 `line`。
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### size
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对于路径图，我们一般只要设置常量表示路径的宽度即可。
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```javascript
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layer.size(2); // 绘制宽度为 2 的路径
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```
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### style
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<embed src="@/docs/api/line_layer/features/linear.zh.md"></embed>
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<embed src="@/docs/api/line_layer/features/dash.zh.md"></embed>
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<embed src="@/docs/api/line_layer/features/border.zh.md"></embed>
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<embed src="@/docs/api/line_layer/features/texture.zh.md"></embed>
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<embed src="@/docs/api/line_layer/features/animate.zh.md"></embed>
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