76 lines
2.6 KiB
TypeScript
76 lines
2.6 KiB
TypeScript
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// pathfinder/client/src/camera.ts
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//
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// Copyright © 2017 The Pathfinder Project Developers.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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import * as glmatrix from 'gl-matrix';
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import {PathfinderView} from "./view";
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const SCALE_FACTOR: number = 1.0 / 100.0;
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export abstract class Camera {
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constructor(canvas: HTMLCanvasElement) {
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this.canvas = canvas;
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}
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protected canvas: HTMLCanvasElement;
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}
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export class OrthographicCamera extends Camera {
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constructor(canvas: HTMLCanvasElement) {
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super(canvas);
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this.translation = glmatrix.vec2.create();
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this.scale = 1.0;
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this.canvas.addEventListener('wheel', event => this.onWheel(event), false);
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this.onPan = null;
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this.onZoom = null;
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}
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onWheel(event: MouseWheelEvent) {
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event.preventDefault();
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if (event.ctrlKey) {
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// Zoom event: see https://developer.mozilla.org/en-US/docs/Web/Events/wheel
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const mouseLocation = glmatrix.vec2.fromValues(event.clientX, event.clientY);
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const canvasLocation = this.canvas.getBoundingClientRect();
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mouseLocation[0] -= canvasLocation.left;
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mouseLocation[1] = canvasLocation.bottom - mouseLocation[1];
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glmatrix.vec2.scale(mouseLocation, mouseLocation, window.devicePixelRatio);
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const absoluteTranslation = glmatrix.vec2.create();
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glmatrix.vec2.sub(absoluteTranslation, this.translation, mouseLocation);
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glmatrix.vec2.scale(absoluteTranslation, absoluteTranslation, 1.0 / this.scale);
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this.scale *= 1.0 - event.deltaY * window.devicePixelRatio * SCALE_FACTOR;
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glmatrix.vec2.scale(absoluteTranslation, absoluteTranslation, this.scale);
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glmatrix.vec2.add(this.translation, absoluteTranslation, mouseLocation);
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if (this.onZoom != null)
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this.onZoom();
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} else {
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// Pan event.
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const delta = glmatrix.vec2.fromValues(-event.deltaX, event.deltaY);
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glmatrix.vec2.scale(delta, delta, window.devicePixelRatio);
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glmatrix.vec2.add(this.translation, this.translation, delta);
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if (this.onPan != null)
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this.onPan();
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}
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}
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onPan: (() => void) | null;
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onZoom: (() => void) | null;
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translation: glmatrix.vec2;
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scale: number;
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}
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