61 lines
2.1 KiB
JavaScript
61 lines
2.1 KiB
JavaScript
import { Tool } from '../tool.js';
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import {
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ZOOM_IN_FACTOR,
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ZOOM_OUT_FACTOR,
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} from '../config.js';
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export class Zoom extends Tool {
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constructor(toolbar) {
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super(toolbar);
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const zoomOut = document.createElement('button');
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const zoomIn = document.createElement('button');
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const zoomAll = document.createElement('button');
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this.div.appendChild(zoomOut);
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this.div.appendChild(zoomIn);
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this.div.appendChild(document.createElement('br'));
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this.div.appendChild(zoomAll);
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this.div.appendChild(document.createElement('br'));
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zoomAll.classList.add('wide');
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zoomOut.innerHTML = '<h2>Zoom<br>Out</h2>';
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zoomIn.innerHTML = '<h2>Zoom<br>In</h2>';
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zoomAll.innerHTML = '<h2>Zoom to Fit</h2>';
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zoomOut.addEventListener('click', (e) => {
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// Aim at center of view
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const x = this.sim.display.width * this.sim.display.scale / 2;
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const y = this.sim.display.height * this.sim.display.scale / 2;
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this.sim.scheduleZoom({x, y}, ZOOM_OUT_FACTOR);
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});
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zoomIn.addEventListener('click', (e) => {
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// Aim at center of view
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const x = this.sim.display.width * this.sim.display.scale / 2;
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const y = this.sim.display.height * this.sim.display.scale / 2;
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this.sim.scheduleZoom({x, y}, ZOOM_IN_FACTOR);
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});
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zoomAll.addEventListener('click', (e) => {
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// Determine bounding box
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const box = this.sim.objects.boundingBox;
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const x = (box.start.x + box.end.x) / 2;
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const y = (box.start.y + box.end.y) / 2;
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if (box.start.x !== box.end.x && box.start.y !== box.end.y) {
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const widthRatio = Math.abs(box.start.x - box.end.x) / this.sim.display.width;
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const heightRatio = Math.abs(box.start.y - box.end.y) / this.sim.display.height;
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const biggerRatio = Math.max(widthRatio, heightRatio);
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if (biggerRatio <= 1) {
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const base2Ratio = Math.log(1/biggerRatio) / Math.log(2);
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this.sim.scheduleZoom({x, y}, Math.floor(base2Ratio));
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} else {
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const base2Ratio = Math.log(1/biggerRatio) / Math.log(2);
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this.sim.scheduleZoom({x, y}, Math.ceil(base2Ratio));
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}
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}
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});
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}
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}
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