mirror of https://gitee.com/antv-l7/antv-l7
154 lines
3.8 KiB
TypeScript
154 lines
3.8 KiB
TypeScript
// @ts-ignore
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import { RasterLayer, Scene } from '@antv/l7';
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import { Mapbox } from '@antv/l7-maps';
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import * as dat from 'dat.gui';
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// @ts-ignore
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// tslint:disable-next-line:no-submodule-imports
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import * as GeoTIFF from 'geotiff';
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import * as React from 'react';
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import { colorScales } from '../lib/colorscales';
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export default class ImageLayerDemo extends React.Component {
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private scene: Scene;
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private gui: dat.GUI;
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public componentWillUnmount() {
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this.scene.destroy();
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if (this.gui) {
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this.gui.destroy();
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}
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}
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public async componentDidMount() {
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const scene = new Scene({
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id: 'map',
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map: new Mapbox({
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center: [121.268, 30.3628],
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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 tiffdata = await this.getTiffData();
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const layer = new RasterLayer({});
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const mindata = -0;
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const maxdata = 8000;
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layer
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.source(tiffdata.data, {
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parser: {
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type: 'raster',
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width: tiffdata.width,
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height: tiffdata.height,
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extent: [73.482190241, 3.82501784112, 135.106618732, 57.6300459963],
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// extent: [
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// 73.4766000000000048,
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// 18.1054999999999993,
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// 135.1066187,
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// 57.630046,
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// ],
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},
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})
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.style({
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opacity: 0.8,
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domain: [mindata, maxdata],
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clampLow: true,
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rampColors: {
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colors: [
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'rgb(166,97,26)',
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'rgb(223,194,125)',
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'rgb(245,245,245)',
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'rgb(128,205,193)',
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'rgb(1,133,113)',
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],
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positions: [0, 0.25, 0.5, 0.75, 1.0],
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},
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});
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scene.addLayer(layer);
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this.scene = scene;
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/*** 运行时修改样式属性 ***/
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const gui = new dat.GUI();
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this.gui = gui;
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const styleOptions = {
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clampLow: true,
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clampHigh: true,
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noDataValue: -9999999,
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min: mindata,
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max: maxdata,
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colorScales: 'jet',
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};
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const rasterFolder = gui.addFolder('栅格可视化');
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rasterFolder.add(styleOptions, 'clampLow').onChange((clampLow: boolean) => {
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layer.style({
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clampLow,
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});
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scene.render();
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});
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rasterFolder
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.add(styleOptions, 'clampHigh')
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.onChange((clampHigh: boolean) => {
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layer.style({
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clampHigh,
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});
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scene.render();
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});
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rasterFolder
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.add(styleOptions, 'min', mindata, maxdata)
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.onChange((min: number) => {
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layer.style({
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domain: [min, styleOptions.max],
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});
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scene.render();
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});
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rasterFolder
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.add(styleOptions, 'max', mindata, maxdata)
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.onChange((max: number) => {
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layer.style({
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domain: [styleOptions.min, max],
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});
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scene.render();
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});
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rasterFolder
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.add(styleOptions, 'colorScales', Object.keys(colorScales))
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.onChange((color: string) => {
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layer.style({
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rampColors: colorScales[color],
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});
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scene.render();
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});
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}
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public render() {
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return (
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<div
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id="map"
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style={{
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position: 'absolute',
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top: 0,
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left: 0,
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right: 0,
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bottom: 0,
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}}
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/>
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);
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}
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private async getTiffData() {
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const response = await fetch(
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'https://gw.alipayobjects.com/os/rmsportal/XKgkjjGaAzRyKupCBiYW.dat',
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// 'https://gw.alipayobjects.com/zos/antvdemo/assets/2019_clip/ndvi_201905.tiff',
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);
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const arrayBuffer = await response.arrayBuffer();
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const tiff = await GeoTIFF.fromArrayBuffer(arrayBuffer);
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const image = await tiff.getImage();
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const width = image.getWidth();
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const height = image.getHeight();
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const values = await image.readRasters();
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return {
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data: values[0],
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width,
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height,
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min: 0,
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max: 8000,
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};
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}
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}
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