<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<script src="http://bigemap.com/offline_data/newjunbiao/vue.js"></script>
<link
href="http://ua.bigemap.com:30081/bmsdk/bigemap-gl.js/v1.1.0/Widgets/widgets.css"
rel="stylesheet"
/>
<script src="http://ua.bigemap.com:30081/bmsdk/bigemap-gl.js/v1.1.0/bigemap-gl.js"></script>
<!-- elementui -->
<script src="http://bigemap.com/offline_data/newjunbiao/elementui.js"></script>
<link
rel="stylesheet"
href="http://bigemap.com/offline_data/newjunbiao/elementui.css"
/>
<!-- 引入turf.js -->
<script src="/offline_data/turf.min.js"></script>
<title>加載大量的線</title>
<style>
* {
margin: 0;
padding: 0;
}
html,
body {
width: 100%;
height: 100%;
}
#app {
width: 100%;
height: 100%;
}
#baseMap {
width: 100%;
height: 100%;
}
.tools {
position: absolute;
z-index: 9;
top: 40px;
right: 60px;
width: 200px;
height: 40px;
display: flex;
align-items: center;
}
</style>
</head>
<body>
<div id="app">
<div id="baseMap"></div>
</div>
<script>
let viewer = null;
window.onload = () => {
new Vue({
el: "#app",
data() {
return {};
},
mounted() {
this.initMap();
},
methods: {
//初始化地圖
initMap() {
bmgl.Config.HTTP_URL =
"http://ua.bigemap.com:30081/bmsdk/";
viewer = new bmgl.Viewer("baseMap", {
mapId: "bigemap.dc-satellite",
infoBox: false,
selectionIndicator: false,
requestRenderMode: false,
});
if (
bmgl.FeatureDetection.supportsImageRenderingPixelated()
) {
viewer.resolutionScale =
window.devicePixelRatio;
}
//開啟抗鋸齒,讓圖像更加清晰
viewer.scene.postProcessStages.fxaa.enabled = true;
this.loadManyLines();
},
loadManyLines() {
var lineStrings = turf.randomLineString(20000, {
bbox: [-180, -90, 180, 90],
num_vertices: 20,
});
// debugger;
let linesArr = lineStrings.features;
instanceArr = [];
linesArr.forEach((v, i) => {
let pos = v.geometry.coordinates;
let instanceItem = new bmgl.GeometryInstance({
geometry: new bmgl.PolylineGeometry({
positions:
bmgl.Cartesian3.fromDegreesArray(
pos.flat()
),
width: 1.0,
}),
});
instanceArr.push(instanceItem);
});
viewer.scene.primitives.add(
new bmgl.Primitive({
geometryInstances: instanceArr,
appearance:
//設發光材質
new bmgl.PolylineMaterialAppearance({
material: bmgl.Material.fromType(
"PolylineGlow",
{
color: bmgl.Color.ORANGE,
glowPower:.4,
taperPower:1.0
}
),
}),
//以顏色作為材質
// new bmgl.PolylineMaterialAppearance({
// material: bmgl.Material.fromType(
// "Color",
// {
// color: bmgl.Color.ORANGE,
// }
// ),
// }),
asynchronous: false,
})
);
},
},
beforeDestroy() {
viewer.destroy();
viewer = null;
},
});
};
</script>
</body>
</html>