I try to use liquid fun. GetPositionBuffer doesn't return a list:
const positions = particleSystem.GetPositionBuffer();
console.log(positions[0]);I prints undefined.
But it must return a list because C++ works like this:
b2Vec2 *pos = m_particleSystem->GetPositionBuffer();
qDebug() << pos[0].x << pos[0].y;Full example that includes the liquid fun lib library: get-position-buffer-box2dwasm-js.zip
index.js
import { box2d, initBox2D } from "./init-box2d.js";
async function init() {
await initBox2D();
const {
b2CircleShape,
b2ParticleGroupDef,
b2ParticleSystemDef,
b2Vec2,
b2World
} = box2d;
const world = new b2World();
const pixelsPerMeter = 50;
const particleSystemDef = new b2ParticleSystemDef();
particleSystemDef.radius = 5 / pixelsPerMeter;
const particleSystem = world.CreateParticleSystem(particleSystemDef);
const spawnArea = new b2CircleShape();
spawnArea.m_radius = 20 / pixelsPerMeter;
spawnArea.m_p.x = 100 / pixelsPerMeter;
spawnArea.m_p.y = 30 / pixelsPerMeter;
const particleGroupDefinition = new b2ParticleGroupDef();
particleGroupDefinition.shape = spawnArea;
particleSystem.CreateParticleGroup(particleGroupDefinition);
const positions = particleSystem.GetPositionBuffer();
console.log(positions[0].x);
}
init();index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Liquid fun</title>
</head>
<body>
<script type="importmap">
{
"imports": {
"box2d-wasm": "/libs/box2d-wasm@7.0.0/es/entry.js"
}
}
</script>
<script type="module" src="./js/index.js"></script>
</body>
</html>
I try to use liquid fun. GetPositionBuffer doesn't return a list:
I prints
undefined.But it must return a list because C++ works like this:
Full example that includes the liquid fun lib library: get-position-buffer-box2dwasm-js.zip
index.js
index.html