ParticleEmitter

pos Vector2

World space position of the emitter

angle number optional

Angle to emit the particles

emitSize number|Vector2 optional, default 0

World space size of the emitter (float for circle diameter, vec2 for rect)

emitTime number optional, default 0

How long to stay alive (0 is forever)

emitRate number optional, default 100

How many particles per second to spawn, does not emit if 0

emitConeAngle number optional, default PI

Half angle of the cone around the emitter's angle that particles move along, PI is every direction

tileInfo TileInfo optional

Tile info to render particles (undefined is untextured)

colorStartA Color optional, default WHITE

Color at start of life 1, randomized between start colors

colorStartB Color optional, default WHITE

Color at start of life 2, randomized between start colors

colorEndA Color optional, default CLEAR_WHITE

Color at end of life 1, randomized between end colors

colorEndB Color optional, default CLEAR_WHITE

Color at end of life 2, randomized between end colors

particleTime number optional, default 0.5

How long particles live

sizeStart number optional, default 0.1

How big are particles at start

sizeEnd number optional, default 1

How big are particles at end

speed number optional, default 0.1

How fast are particles when spawned, in world units per frame (at 60fps, so multiply units/sec by 1/60)

angleSpeed number optional, default 0.05

How fast are particles rotating, in radians per frame (at 60fps)

damping number optional, default 1

How much to dampen particle speed, per-frame velocity multiplier (1 = no damping, .9 = lose 10% speed each frame)

angleDamping number optional, default 1

How much to dampen particle angular speed, per-frame multiplier (1 = no damping)

gravityScale number optional, default 0

How much gravity affects particles

particleConeAngle number optional

Half angle each side of the emitter's angle for a particle's start angle, PI is any angle

fadeRate number optional, default 0.1

Fraction of life spent fading: half at fade-in (start), half at fade-out (end). e.g. .2 = 10% fade-in, 80% full opacity, 10% fade-out

randomness number optional, default 0.2

Apply extra randomness percent

collideLevel boolean optional, default false

Do particles collide with the level's tiles, world space emitters only

additive boolean optional, default false

Should particles use additive blend

randomColorLinear boolean optional, default true

Should color be randomized linearly or across each component

renderOrder number optional

Render order for particles (additive is above other stuff by default)

localSpace boolean optional, default false

Should it be in local space of emitter (world space is default)

// create a particle emitter
let pos = vec2(2,3);
let particleEmitter = new ParticleEmitter
(
    pos, 0, 1, 0, 500, PI,      // pos, angle, emitSize, emitTime, emitRate, emitConeAngle
    tile(0, 16),                // tileInfo
    rgb(1,1,1,1), rgb(0,0,0,1), // colorStartA, colorStartB
    rgb(1,1,1,0), rgb(0,0,0,0), // colorEndA, colorEndB
    1, .2, .2, .1, .05,  // particleTime, sizeStart, sizeEnd, speed, angleSpeed
    .99, 1, 1, PI, .05,  // damping, angleDamping, gravityScale, particleConeAngle, fadeRate
    .5, true             // randomness, collideLevel
);

immediate boolean optional, default false

true removes it and its particles at once, with no particleDestroyCallback for them, false stops emitting and lets the particles finish first