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Mask.js
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Mask.js
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// The MIT License (MIT)
//
// Copyright (c) 2019-2021 Camptocamp SA
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
import Layer from 'ol/layer/Layer.js';
import {createCanvasContext2D} from 'ol/dom.js';
import {DEVICE_PIXEL_RATIO} from 'ol/has.js';
/**
* @typedef {Object} Options
* @property {number} [margin]
* @property {number} [extentInMeters]
*/
/**
* @extends {Layer<import("ol/source/Source.js").default>}
*/
export default class Mask extends Layer {
/**
* @param {import('ol/layer/Layer.js').Options} layerOptions
* @param {Options} maskOptions
*/
constructor(layerOptions = {}, maskOptions = {}) {
super(layerOptions);
/**
* @private
*/
this.context_ = createCanvasContext2D();
this.context_.canvas.style.opacity = '0.5';
this.context_.canvas.style.position = 'absolute';
this.margin_ = maskOptions.margin || 100;
this.extentInMeters_ = maskOptions.extentInMeters || 0;
}
/**
* @param {import("ol/coordinate.js").Coordinate} center, a xy point.
* @param {number} halfLength a half length of a square's side.
* @return {import("ol/extent.js").Extent} an extent.
*/
createExtent(center, halfLength) {
const minx = center[0] - halfLength;
const miny = center[1] - halfLength;
const maxx = center[0] + halfLength;
const maxy = center[1] + halfLength;
return [minx, miny, maxx, maxy];
}
/**
* @param {import("ol/PluggableMap").FrameState} frameState
*/
render(frameState) {
const context = this.context_;
const cwidth = frameState.size[0];
context.canvas.width = cwidth;
const cheight = frameState.size[1];
context.canvas.height = cheight;
// background (clockwise)
context.beginPath();
context.moveTo(0, 0);
context.lineTo(cwidth, 0);
context.lineTo(cwidth, cheight);
context.lineTo(0, cheight);
context.lineTo(0, 0);
context.closePath();
let extentLength = Math.min(cwidth, cheight) - this.margin_ * 2;
if (this.extentInMeters_) {
extentLength = (DEVICE_PIXEL_RATIO * this.extentInMeters_) / frameState.viewState.resolution;
}
// Draw the get data zone
const extent = this.createExtent([cwidth / 2, cheight / 2], Math.ceil(extentLength / 2));
context.moveTo(extent[0], extent[1]);
context.lineTo(extent[0], extent[3]);
context.lineTo(extent[2], extent[3]);
context.lineTo(extent[2], extent[1]);
context.lineTo(extent[0], extent[1]);
context.closePath();
// Fill the mask
context.fillStyle = 'rgba(0, 5, 25, 0.5)';
context.fill();
return context.canvas;
}
}