95 lines
2.6 KiB
JavaScript
95 lines
2.6 KiB
JavaScript
import {Tool} from '../tool.js';
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import {
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TOOL_INFO_CLASSNAME,
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WIDE_CLASSNAME,
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} from '../config.js';
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export class UtilityTool extends Tool {
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currentTimeEl = undefined;
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get timeText() {
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let time = this.sim.time;
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// Time in milliseconds
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const ms = Math.floor(time % 1000);
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time = (time - ms) / 1000;
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const s = Math.floor(time % 60);
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time = (time - s) / 60;
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const m = Math.floor(time % 60);
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time = (time - m) / 60;
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const h = Math.floor(time % 24);
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time = (time - h) / 24;
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const d = Math.floor(time);
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return [
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d || undefined,
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h.toString().padStart(2, '0'),
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m.toString().padStart(2, '0'),
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[
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s.toString().padStart(2, '0'),
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ms.toString().padStart(3, '0'),
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].join('.')
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].filter(x => x !== undefined).join(':');
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}
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frame() {
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if (this.currentTimeEl) {
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this.currentTimeEl.innerHTML = this.timeText;
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}
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}
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constructor(container) {
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super(container);
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const zeroVelocity = document.createElement('button');
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const clearTraces = document.createElement('button');
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const currentTime = document.createElement('button');
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const clearDebug = document.createElement('button');
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this.currentTimeEl = currentTime;
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this.div.appendChild(currentTime);
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this.div.appendChild(zeroVelocity);
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this.div.appendChild(clearTraces);
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this.div.appendChild(clearDebug);
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zeroVelocity.classList.add(WIDE_CLASSNAME);
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clearTraces.classList.add(WIDE_CLASSNAME);
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currentTime.classList.add(TOOL_INFO_CLASSNAME);
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currentTime.classList.add(WIDE_CLASSNAME);
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clearDebug.classList.add(WIDE_CLASSNAME);
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zeroVelocity.innerHTML = 'Zero Momentum';
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clearTraces.innerHTML = 'Clear Traces';
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currentTime.innerHTML = this.timeText;
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clearDebug.innerHTML = 'Clear Debug';
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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 = undefined;
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});
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clearTraces.addEventListener('click', () => {
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// Obliterate object histories
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this.sim.system.forEachObject(obj => {
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obj.history = [];
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}, {alive: null});
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});
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clearDebug.addEventListener('click', () => {
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this.sim.info = {};
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});
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}
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}
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