Game Programming Using Qt

Time for action – vanishing coins spawning particles

It is time now to practice our freshly acquired skills. The task is to add a particle effect to the game when the player collects coins. The coin will explode into a sprinkle of colorful stars when collected.

Start by declaring a particle system as filling the game scene, along with the particle painter definition:

ParticleSystem {
  id: coinParticles
  anchors.fill: parent // scene is the parent

  ImageParticle {
    source: "particle.png"
    colorVariation: 1
    rotationVariation: 180
    rotationVelocityVariation: 10
  }
}

Next, modify the definition of Coin to include an emitter:

Emitter { id: emitter system: coinParticles emitRate: 0 lifeSpan: 500 lifeSpanVariation: 100 velocity: AngleDirection { angleVariation: ...