PhysicsMaterial

physics material

Type	Name	Interface Description
Variables	bounciness: number	• Function: Gets the bounciness (also elasticity).
Variables	dynamicFriction: number	• Function: Gets the dynamic friction.
Variables	staticFriction: number	• Function: Gets the static friction.
Functions	constructor()

Examples

constructor()

let obj = new APJS.PhysicsMaterial();

Use Case

Tap to drop a ball/coin that bounces multiple times on a static floor — full Physics Matter resource flow (DSL: add_builtin_resource → set_resource_properties →…

@component()
export class TapToDropBouncy extends APJS.BasicScriptComponent {
  private rb: APJS.RigidBody2D | null = null;
  private collider: APJS.CircleCollider2D | null = null;
  private touchCallback: ((event: APJS.IEvent) => void) | null = null;
  private collisionCallback: ((event: APJS.IEvent) => void) | null = null;
  private dropped = false;
  private bounceCount = 0;

  onStart(): void {
    const obj = this.getSceneObject();
    this.rb = obj.getComponent("RigidBody2D") as APJS.RigidBody2D;
    this.collider = obj.getComponent("CircleCollider2D") as APJS.CircleCollider2D;
    if (!this.rb || !this.collider) return;

    // emitCollisionEvent is APJS-runtime-only — must set in onStart, not in DSL.
    this.collider.emitCollisionEvent = true;

    this.touchCallback = (event: APJS.IEvent) => {
      const touch = event.args[0] as APJS.TouchData;
      if (touch.phase === APJS.TouchPhase.Began && !this.dropped && this.rb) {
        this.dropped = true;
        this.rb.static = false;  // gravity now applies
      }
    };
    APJS.EventManager.getGlobalEmitter().on(APJS.EventType.Touch, this.touchCallback);

    this.collisionCallback = (event: APJS.IEvent) => {
      this.bounceCount++;
      // Optional: stop tracking after 5 bounces, or play SFX, or update score, etc.
      if (this.bounceCount === 1) console.log("[Bouncy] first impact");
    };
    const emitter = APJS.EventManager.getObjectEmitter(this.collider);
    emitter.on(APJS.CollisionEvent2D.Enter, this.collisionCallback, this);
  }

  onDestroy(): void {
    if (this.touchCallback) {
      APJS.EventManager.getGlobalEmitter().off(APJS.EventType.Touch, this.touchCallback);
    }
    if (this.collisionCallback && this.collider) {
      APJS.EventManager.getObjectEmitter(this.collider).off(APJS.CollisionEvent2D.Enter, this.collisionCallback, this);
    }
  }
}