54 lines
1.1 KiB
Go
54 lines
1.1 KiB
Go
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package game
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import (
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"image"
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. "openquell/components"
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"github.com/mlange-42/arche/ecs"
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"github.com/mlange-42/arche/generic"
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)
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type ParticleSystem struct {
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World *ecs.World
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Selector *generic.Filter2[Position, Particle]
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Cellsize int
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}
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func NewParticleSystem(world *ecs.World) *ParticleSystem {
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system := &ParticleSystem{
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Selector: generic.NewFilter2[Position, Particle](),
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}
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return system
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}
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func (system *ParticleSystem) Update(detonate bool, position *image.Point) {
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// display debris after collecting
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query := system.Selector.Query(system.World)
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for query.Next() {
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// we loop, but it's only one anyway
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ptposition, particle := query.Get()
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if detonate {
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// particle appears
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ptposition.Update(
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position.X-(system.Cellsize/2),
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position.Y-(system.Cellsize/2),
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64,
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)
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particle.Index = 0 // start displaying the particle
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} else {
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switch {
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// particle shows from earlier tick, animate
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case particle.Index > -1 && particle.Index < len(particle.Particles)-1:
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particle.Index++
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default:
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// last sprite reached, remove it
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particle.Index = -1
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}
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}
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}
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}
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