103 lines
2.8 KiB
JavaScript
103 lines
2.8 KiB
JavaScript
/*
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* This file is part of BlueMap, licensed under the MIT License (MIT).
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*
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* Copyright (c) Blue (Lukas Rieger) <https://bluecolored.de>
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* Copyright (c) contributors
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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export class TouchZoomControls {
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/**
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* @param hammer {Hammer.Manager}
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*/
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constructor(hammer) {
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this.hammer = hammer;
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this.manager = null;
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this.moving = false;
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this.deltaZoom = 1;
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this.lastZoom = 1;
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}
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/**
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* @param manager {ControlsManager}
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*/
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start(manager) {
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this.manager = manager;
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this.hammer.on("zoomstart", this.onTouchDown);
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this.hammer.on("zoommove", this.onTouchMove);
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this.hammer.on("zoomend", this.onTouchUp);
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this.hammer.on("zoomcancel", this.onTouchUp);
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}
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stop() {
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this.hammer.off("zoomstart", this.onTouchDown);
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this.hammer.off("zoommove", this.onTouchMove);
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this.hammer.off("zoomend", this.onTouchUp);
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this.hammer.off("zoomcancel", this.onTouchUp);
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}
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/**
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* @param delta {number}
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* @param map {Map}
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*/
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update(delta, map) {
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if (this.deltaZoom === 1) return;
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this.manager.distance /= this.deltaZoom;
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this.deltaZoom = 1;
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}
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reset() {
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this.deltaZoom = 1;
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}
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/**
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* @private
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* @param evt {object}
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*/
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onTouchDown = evt => {
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this.moving = true;
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this.lastZoom = 1;
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}
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/**
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* @private
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* @param evt {object}
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*/
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onTouchMove = evt => {
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if(this.moving){
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this.deltaZoom *= evt.scale / this.lastZoom;
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}
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this.lastZoom = evt.scale;
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}
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/**
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* @private
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* @param evt {object}
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*/
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onTouchUp = evt => {
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this.moving = false;
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}
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} |