104 lines
3.3 KiB
JavaScript
104 lines
3.3 KiB
JavaScript
import {
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TOOL_INFO_CLASSNAME,
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WIDE_CLASSNAME,
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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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import {Tool} from '../tool.js';
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import {zero} from '../vector.js';
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export class Zoom extends Tool {
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currentScaleEl = undefined;
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get displayScaleText() {
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return `Scale: ${this.sim.getScaleDisplay()}`;
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}
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setContainer(container) {
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super.setContainer(container);
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this.currentScaleEl.innerHTML = this.displayScaleText;
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this.sim.onZoom(() => {
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this.currentScaleEl.innerHTML = this.displayScaleText;
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});
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}
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constructor() {
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super();
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const currentScale = document.createElement('button')
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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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const zeroVelocity = document.createElement('button');
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this.currentScaleEl = currentScale;
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this.div.appendChild(currentScale);
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this.div.appendChild(zoomOut);
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this.div.appendChild(zoomIn);
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this.div.appendChild(zoomAll);
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this.div.appendChild(zeroVelocity);
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currentScale.classList.add(WIDE_CLASSNAME);
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currentScale.classList.add(TOOL_INFO_CLASSNAME);
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zoomOut.innerHTML = 'Zoom<br>Out';
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zoomIn.innerHTML = 'Zoom<br>In';
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zoomAll.innerHTML = 'Zoom to Fit';
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zeroVelocity.innerHTML = 'Zero Momentum';
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zoomOut.addEventListener('click', () => {
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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(this.sim.screenToSim(x, y), ZOOM_OUT_FACTOR);
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});
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zoomIn.addEventListener('click', () => {
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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(this.sim.screenToSim(x, y), ZOOM_IN_FACTOR);
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});
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zoomAll.addEventListener('click', () => {
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// Determine bounding box
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const box = this.sim.system.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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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 ratio = Math.max(widthRatio, heightRatio) * 4;
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const factor = Math.ceil(Math.log2(1 / ratio));
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// Determine average momentum and set panning velocity to match
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const {netMomentum, totalMass} = this.sim.system.computeSystemCenter();
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const netVelocity = {
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x: netMomentum.x / totalMass,
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y: netMomentum.y / totalMass,
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};
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this.sim.scheduleZoom({x, y}, factor, netVelocity)
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});
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zeroVelocity.addEventListener('click', () => {
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// Determine center of mass and average momentum
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const {totalMass, netMomentum} = this.sim.system.computeSystemCenter();
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const netVelocity = {
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x: netMomentum.x / totalMass,
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y: netMomentum.y / totalMass,
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};
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// Apply offset to all object velocities
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this.sim.system.forEachObject(obj => {
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obj.velocity.x -= netVelocity.x;
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obj.velocity.y -= netVelocity.y;
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});
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// Cancel panning
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this.sim.panning.setVelocity(zero);
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});
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}
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}
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