93 lines
2.6 KiB
Go
93 lines
2.6 KiB
Go
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package systems
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import (
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"openquell/components"
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. "openquell/components"
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"openquell/grid"
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"openquell/observers"
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"github.com/hajimehoshi/ebiten/v2"
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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 CollisionSystem struct {
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World *ecs.World
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Selector *generic.Filter4[Position, Velocity, Renderable, Collider]
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GridContainer *grid.GridContainer
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}
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func NewCollisionSystem(world *ecs.World, gridcontainer *grid.GridContainer) System {
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system := &CollisionSystem{
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Selector: generic.NewFilter4[Position, Velocity, Renderable, Collider](),
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GridContainer: gridcontainer,
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World: world,
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}
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return system
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}
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func (system CollisionSystem) Update() error {
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entityobserver := observers.GetEntityObserver(system.World)
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posID := ecs.ComponentID[components.Position](system.World)
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EntitiesToRemove := []ecs.Entity{}
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query := system.Selector.Query(system.World)
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for query.Next() {
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position, velocity, _, handler := query.Get()
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if velocity.Moving() {
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// check if we bump agains the screen edge
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ok, newpos := system.GridContainer.Grid.BumpEdge(position, velocity)
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if ok {
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if handler.EdgeHandler != nil {
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if !handler.EdgeHandler(system.World, position, newpos, velocity, query.Entity()) {
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EntitiesToRemove = append(EntitiesToRemove, query.Entity())
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}
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}
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} else {
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// check if we collide with some solid entity
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ok, tilepos := system.GridContainer.Grid.GetSolidNeighborPosition(position, velocity, true)
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if ok {
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intersects, newpos := tilepos.Intersects(position, velocity)
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if intersects {
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if handler.CollisionHandler != nil {
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if !handler.CollisionHandler(system.World, position, newpos, velocity, query.Entity()) {
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EntitiesToRemove = append(EntitiesToRemove, query.Entity())
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}
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}
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}
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}
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}
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// check if current entity bumps into another entity
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for foreign_entity := range entityobserver.Entities {
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if foreign_entity == query.Entity() {
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// don't check entity against itself
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continue
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}
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foreign_position := (*Position)(system.World.Get(foreign_entity, posID))
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ok, newpos := foreign_position.Intersects(position, velocity)
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if ok {
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if handler.CollisionHandler != nil {
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if !handler.CollisionHandler(system.World, position, newpos, velocity, foreign_entity) {
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EntitiesToRemove = append(EntitiesToRemove, query.Entity())
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}
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}
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}
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}
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}
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}
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for _, entity := range EntitiesToRemove {
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system.World.RemoveEntity(entity)
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}
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return nil
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}
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func (system *CollisionSystem) Draw(screen *ebiten.Image) {}
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