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Examples
Layers (30)
拉伸多边形以绘制3D室内地图用3D形式呈现建筑物添加3D模型调整图层不透明度为一系列图像添加动画效果为线添加动画效果为点添加动画效果按照缩放级别改变建筑颜色更改标注的大小写显示具有自定义属性的HTML聚类创建样式聚类使用按钮更改图层颜色添加自定义样式图层给圆添加数据驱动属性的样式给线添加数据驱动属性的样式。显示多种文本格式并设置其样式为多边形添加图案在标签下添加新图层绘制 GeoJSON 点创建热力图图层添加晕暄使用表达式创建渐变色线条添加 GeoJSON 多边形添加 GeoJSON 线设置海洋深度数据样式改变行政边界世界观根据缩放级别更新等值线图层显示和隐藏图层变量标签位置可视化人口密度

使用表达式创建渐变色线条

使用 line-gradient 的绘制属性和表达式来可视化与线的起点间的距离。

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Mapbox GL requires WebGL support. Please check that you are using a supported browser and that WebGL is enabled.
<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8' />
<title>使用表达式创建渐变色线条</title>
<meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
<script src='https://api.tiles.mapbox.com/mapbox-gl-js/v1.1.1/mapbox-gl.js'></script>
<link href='https://api.tiles.mapbox.com/mapbox-gl-js/v1.1.1/mapbox-gl.css' rel='stylesheet' />
<style>
body { margin:0; padding:0; }
#map { position:absolute; top:0; bottom:0; width:100%; }
</style>
</head>
<body>
<div id='map'></div>
<script>
mapboxgl.accessToken = '<your access token here>';
var map = window.map = new mapboxgl.Map({
container: 'map',
style: 'mapbox://styles/mapbox/light-v10',
center: [-77.035, 38.875],
zoom: 12,
});
var geojson = {
"type": "FeatureCollection",
"features": [{
"type": "Feature",
"properties": {},
"geometry": {
"coordinates": [
[-77.044211, 38.852924 ],
[-77.045659, 38.860158 ],
[-77.044232, 38.862326 ],
[-77.040879, 38.865454 ],
[-77.039936, 38.867698 ],
[-77.040338, 38.86943 ],
[-77.04264, 38.872528 ],
[-77.03696, 38.878424 ],
[-77.032309, 38.87937 ],
[-77.030056, 38.880945 ],
[-77.027645, 38.881779 ],
[-77.026946, 38.882645 ],
[-77.026942, 38.885502 ],
[-77.028054, 38.887449 ],
[-77.02806, 38.892088 ],
[-77.03364, 38.892108 ],
[-77.033643, 38.899926 ]
],
"type": "LineString"
}
}]
};
map.on('load', function () {
// 'line-gradient' can only be used with GeoJSON sources
// and the source must have the 'lineMetrics' option set to true
map.addSource('line', {
type: 'geojson',
lineMetrics: true,
data: geojson
});
// the layer must be of type 'line'
map.addLayer({
type: 'line',
source: 'line',
id: 'line',
paint: {
'line-color': 'red',
'line-width': 14,
// 'line-gradient' must be specified using an expression
// with the special 'line-progress' property
'line-gradient': [
'interpolate',
['linear'],
['line-progress'],
0, "blue",
0.1, "royalblue",
0.3, "cyan",
0.5, "lime",
0.7, "yellow",
1, "red"
]
},
layout: {
'line-cap': 'round',
'line-join': 'round'
}
});
});
</script>
</body>
</html>