An onEmit callback for an eased property.
It prepares the particle for easing by Phaser.GameObjects.Particles.EmitterOp#easeValueUpdate.
| name | type | description |
|---|---|---|
| particle | Phaser.GameObjects.Particles.Particle |
The particle. |
| key | string |
The name of the property. |
{@link Phaser.GameObjects.Particles.EmitterOp#start}, as the new value of the property.