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example-pixi

PixiJS integration patterns for Helios. Use when creating high-performance WebGL 2D animations with PixiJS.

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PixiJS + Helios

Integrate Helios with PixiJS by driving the Pixi scene properties from the Helios subscription loop.

Quick Start

import { Helios } from '@helios-project/core';
import { Application, Graphics } from 'pixi.js';

// 1. Initialize Pixi
const app = new Application();
await app.init({ resizeTo: window });
document.body.appendChild(app.canvas);

// 2. Initialize Helios
const helios = new Helios({ fps: 30, duration: 5 });

// 3. Create Scene
const rect = new Graphics().rect(0, 0, 100, 100).fill(0xff0000);
rect.pivot.set(50, 50);
rect.position.set(app.screen.width / 2, app.screen.height / 2);
app.stage.addChild(rect);

// 4. Bind Timeline (Crucial for Renderer)
helios.bindToDocumentTimeline();

// 5. Drive Animation
helios.subscribe((state) => {
  const t = state.currentTime;

  // Update properties based on time
  rect.rotation = t * 1.5;
  rect.x = (app.screen.width / 2) + Math.sin(t) * 100;
});

Key Patterns

Bind to Document Timeline

PixiJS and other WebGL libraries often have their own internal tickers. To ensure frame-perfect rendering during export (via Renderer), you must bind Helios to the document.timeline.

helios.bindToDocumentTimeline();

This allows the Renderer (via CdpTimeDriver) to control the global clock, which PixiJS respects if properly synchronized.

Disable Internal Ticker (Optional but Recommended)

If you are strictly driving the scene via helios.subscribe(), you might not need Pixi's internal ticker for animation logic, though Pixi still needs to render. The standard pattern is to let Pixi render naturally but update state in the Helios subscriber.

Source Files

Example: examples/pixi-canvas-animation/

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