fix: transform system memory leak (#16)

src/transform/system/transfromSystem.ts

@@ -9,6 +9,7 @@ export class TransformSystem implements ISystem {
  private static _instance: TransformSystem | null = null
 
  private _components: ComponentConstructor<ITransformComponent>[] = []
+ private _componentGroups = []
 
  static createAndAddToEngine(): TransformSystem {
  if (this._instance == null) {
@@ -27,24 +28,32 @@ export class TransformSystem implements ISystem {
  private constructor() {
  TransformSystem._instance = this
  this._components.push(MoveTransformComponent)
+ this._componentGroups.push(engine.getComponentGroup(MoveTransformComponent, Transform))
+
  this._components.push(RotateTransformComponent)
+ this._componentGroups.push(engine.getComponentGroup(RotateTransformComponent, Transform))
+
  this._components.push(ScaleTransformComponent)
+ this._componentGroups.push(engine.getComponentGroup(ScaleTransformComponent, Transform))
+
  this._components.push(FollowPathComponent)
+ this._componentGroups.push(engine.getComponentGroup(FollowPathComponent, Transform))
+
  this._components.push(KeepRotatingComponent)
+ this._componentGroups.push(engine.getComponentGroup(KeepRotatingComponent, Transform))
  }
 
  update(dt: number) {
- this._components.forEach(component => {
- this.updateComponent(dt, component)
- })
+ for (let i = 0; i < this._components.length; i++) {
+ this.updateComponent(dt, this._components[i], this._componentGroups[i])
+ }
  }
 
  private updateComponent<T extends ITransformComponent>(
  dt: number,
- component: ComponentConstructor<T>
+ component: ComponentConstructor<T>,
+ group: ComponentGroup
  ) {
- const group = engine.getComponentGroup(component, Transform)
-
  group.entities.forEach(entity => {
  const transform = entity.getComponent(Transform)
  const comp = entity.getComponent(component)