mirror of https://gitee.com/antv-l7/antv-l7
92 lines
2.4 KiB
TypeScript
92 lines
2.4 KiB
TypeScript
//@ts-ignore
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import { Scene, RasterLayer } from '@antv/l7';
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//@ts-ignore
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import { Map } from '@antv/l7-maps';
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import React, { useEffect } from 'react';
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export default () => {
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useEffect(() => {
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const scene = new Scene({
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id: 'map2',
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map: new Map({
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center: [105.732421875, 32.24997445586331],
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pitch: 0,
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style: 'dark',
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zoom: 2,
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}),
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});
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const canvas = document.createElement('canvas');
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canvas.width = 256;
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canvas.height = 256;
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const ctx = canvas.getContext('2d') as CanvasRenderingContext2D;
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scene.on('loaded', () => {
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const layer = new RasterLayer();
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layer
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.source(
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'http://webst0{1-4}.is.autonavi.com/appmaptile?style=6&x={x}&y={y}&z={z}',
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{
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parser: {
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type: 'rasterTile',
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dataType: 'arraybuffer',
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tileSize: 256,
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zoomOffset: 0,
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extent: [-180, -85.051129, 179, 85.051129],
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minZoom: 0,
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format: async (data: any) => {
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const blob: Blob = new Blob([new Uint8Array(data)], {
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type: 'image/png',
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});
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const img = await createImageBitmap(blob);
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ctx.clearRect(0, 0, 256, 256);
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ctx.drawImage(img, 0, 0, 256, 256);
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const imgData = ctx.getImageData(0, 0, 256, 256).data;
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const arr: number[] = [];
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for (let i = 0; i < imgData.length; i += 4) {
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const R = imgData[i];
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arr.push(R);
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}
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return {
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rasterData: arr,
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width: 256,
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height: 256,
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};
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},
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},
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},
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)
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.style({
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domain: [0, 255],
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clampLow: true,
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rampColors: {
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colors: [
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'#f7fcf5',
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'#e5f5e0',
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'#c7e9c0',
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'#a1d99b',
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'#74c476',
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'#41ab5d',
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'#238b45',
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'#006d2c',
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'#00441b',
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],
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positions: [0, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 1.0],
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},
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});
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scene.addLayer(layer)
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});
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}, []);
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return (
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<div
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id="map2"
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style={{
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height: '500px',
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position: 'relative',
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}}
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/>
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);
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}; |