72 lines
1.8 KiB
JavaScript
72 lines
1.8 KiB
JavaScript
import Debug from '../../conf/Debug';
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// računa približevanje ter računa/popravlja odmike videa
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// calculates zooming and video offsets/panning
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class Zoom {
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// functions
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constructor(videoData, logger) {
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this.scale = 1;
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this.logScale = 0;
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this.scaleStep = 0.1;
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this.minScale = -1; // 50% (log2(0.5) = -1)
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this.maxScale = 3; // 800% (log2(8) = 3)
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this.conf = videoData;
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this.logger = logger;
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}
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reset(){
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this.scale = 1;
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}
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zoomStep(amount){
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this.logScale += amount;
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if (this.logScale <= this.minScale) {
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this.logScale = this.minScale;
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}
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if (this.logScale >= this.maxScale) {
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this.logScale = this.maxScale;
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}
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this.scale = Math.pow(2, this.logScale);
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this.logger.log('info', 'debug', "[Zoom::zoomStep] changing zoom by", amount, ". New zoom level:", this.scale);
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this.conf.restoreAr();
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this.conf.announceZoom(this.scale);
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}
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setZoom(scale, no_announce){
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this.logger.log('info', 'debug', "[Zoom::setZoom] Setting zoom to", scale, "!");
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// NOTE: SCALE IS NOT LOGARITHMIC
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if(scale < Math.pow(2, this.minScale)) {
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scale = this.minScale;
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} else if (scale > Math.pow(2, this.maxScale)) {
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scale = this.maxScale;
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}
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this.scale = scale;
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this.conf.restoreAr();
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if (!no_announce) {
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this.conf.announceZoom(this.scale);
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}
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}
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applyZoom(stretchFactors){
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if (!stretchFactors) {
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return;
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}
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this.logger.log('info', 'debug', "[Zoom::setZoom] Applying zoom. Stretch factors pre:", stretchFactors, " —> scale:", this.scale);
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stretchFactors.xFactor *= this.scale;
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stretchFactors.yFactor *= this.scale;
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this.logger.log('info', 'debug', "[Zoom::setZoom] Applying zoom. Stretch factors post:", stretchFactors);
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}
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}
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export default Zoom;
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