Created
October 24, 2018 12:10
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OpenLayers ImageStatic with canvas source
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| import ImageStatic from 'ol/source/ImageStatic'; | |
| import ImageCanvas from 'ol/ImageCanvas'; | |
| import EventType from 'ol/events/EventType'; | |
| import {listen} from 'ol/events'; | |
| class Canvas extends ImageStatic { | |
| constructor(options) { | |
| super(options); | |
| this.image_ = new ImageCanvas(options.imageExtent, 1, 1, options.canvas); | |
| listen(this.image_, EventType.CHANGE, this.handleImageChange, this); | |
| } | |
| } | |
| export default Canvas; |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Using Parcel with OpenLayers</title> | |
| <style> | |
| #map { | |
| width: 400px; | |
| height: 250px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="map"></div> | |
| <script src="./index.js"></script> | |
| </body> | |
| </html> |
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| import 'ol/ol.css'; | |
| import {Map, View} from 'ol'; | |
| import ImageLayer from 'ol/layer/Image'; | |
| import ImageSource from './ImageCanvas.js'; | |
| import Projection from 'ol/proj/Projection'; | |
| import {getCenter} from 'ol/extent'; | |
| let canvas = document.createElement('canvas'); | |
| // Set dimensions of image. | |
| canvas.width = 100; | |
| canvas.height = 100; | |
| let ctx = canvas.getContext('2d'); | |
| ctx.fillStyle = 'green'; | |
| ctx.fillRect(0, 0, 100, 100); | |
| let extent = [0, 0, canvas.width, canvas.height]; | |
| let projection = new Projection({ | |
| code: 'pixel-projection', | |
| units: 'pixels', | |
| extent: extent, | |
| }); | |
| const map = new Map({ | |
| target: 'map', | |
| layers: [ | |
| new ImageLayer({ | |
| source: new ImageSource({ | |
| canvas: canvas, | |
| projection: projection, | |
| imageExtent: extent, | |
| }), | |
| }), | |
| ], | |
| view: new View({ | |
| projection: projection, | |
| center: getCenter(extent), | |
| // Initially, display canvas at original resolution (100%). | |
| resolution: 1, | |
| zoomFactor: 2, | |
| // Allow a maximum of 4x magnification. | |
| minResolution: 0.25, | |
| // Restrict movement. | |
| extent: extent, | |
| }), | |
| }); |
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