63 lines
1.8 KiB
JavaScript
63 lines
1.8 KiB
JavaScript
/*
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Copyright (c) 2020 Jean-Marc VIGLINO,
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released under the CeCILL-B license (French BSD license)
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(http://www.cecill.info/licences/Licence_CeCILL-B_V1-en.txt).
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*/
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import ol_particule_Base from './Base.js'
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/** A cloud particule to display clouds over the map
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* @constructor
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* @extends {ol_particule_Base}
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* @param {*} options
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* @param {ol.Overlay} options.overlay
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* @param {ol.pixel} options.coordinate the position of the particule
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*/
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var ol_particule_Cloud = class olparticuleCloud extends ol_particule_Base {
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constructor(options) {
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options = options || {};
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super(options);
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this.set('size', [100, 100]);
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var canvas = document.createElement('canvas');
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canvas.width = 200;
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canvas.height = 200;
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var ctx = canvas.getContext('2d');
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var grd = this.gradient = ctx.createRadialGradient(50, 50, 0, 50, 50, 50);
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grd.addColorStop(0, 'rgba(255,255,255,.2');
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grd.addColorStop(1, 'rgba(255,255,255,0');
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// Create cloud image
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this.image = canvas;
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for (var k = 0; k < 7; k++) {
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ctx.save();
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var x = Math.random() * 100;
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var y = Math.random() * 100;
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ctx.translate(x, y);
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ctx.fillStyle = grd;
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ctx.fillRect(0, 0, canvas.width, canvas.height);
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ctx.restore();
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}
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}
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/** Draw the particule
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* @param {CanvasRenderingContext2D } ctx
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*/
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draw(ctx) {
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ctx.save();
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ctx.translate(this.coordinate[0], this.coordinate[1]);
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ctx.drawImage(this.image, -this.image.width / 2, -this.image.width / 2);
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ctx.restore();
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}
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/** Update the particule
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* @param {number} dt timelapes since last call
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*/
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update(dt) {
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var speed = this.getOverlay().get('speed') * dt / this.getOverlay()._fps;
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var angle = this.getOverlay().get('angle');
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this.coordinate[0] += speed * Math.cos(angle);
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this.coordinate[1] += speed * Math.sin(angle);
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}
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}
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export default ol_particule_Cloud
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