EmitParticles

The EmitParticles component makes the entity emit particles.

The particles are data points stored in an array, updated by sys_particles. If the entity has one of the RenderParticles components (colored or textured), the particles are rendered by sys_render_forward.

View source on GitHub

import {Entity} from "../../lib/world.js";
import {Game} from "../game.js";
import {Has} from "../world.js";

export interface EmitParticles {
    Lifespan: number;
    Frequency: number;
    Speed: number;
    Instances: Array<number>;
    SinceLast: number;
}

Add EmitParticles to an entity.

The entity also needs the RenderParticlesColored or RenderParticlesTextured component.

lifespan param: How long particles live for.
frequency param: How often particles spawn.
speed param: How fast particles move.

export function emit_particles(lifespan: number, frequency: number, speed: number) {
    return (game: Game, entity: Entity) => {
        game.World.Signature[entity] |= Has.EmitParticles;
        game.World.EmitParticles[entity] = {
            Lifespan: lifespan,
            Frequency: frequency,
            Speed: speed,
            Instances: [],
            SinceLast: 0,
        };
    };
}