/*

     File: APLSpaceScene.h

 Abstract: 

 This is the scene that implements the physics demo. It is responsible for handling keyboard inputs and driving the simulation in response to user input and physics interactions.

  Version: 1.2

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#import <SpriteKit/SpriteKit.h>

// These constants are used to map keyboard events into player events.

typedef enum {

    kPlayerForward = 0,

    kPlayerLeft = 1,

    kPlayerRight = 2,

    kPlayerBack = 3,

    kPlayerAction = 4,

    kNumPlayerActions

} PlayerActions;

// These constans are used to define the physics interactions between physics bodies in the scene.

static const uint32_t missileCategory  =  0x1 << 0;

static const uint32_t shipCategory     =  0x1 << 1;

static const uint32_t asteroidCategory =  0x1 << 2;

static const uint32_t planetCategory   =  0x1 << 3;

static const uint32_t edgeCategory     =  0x1 << 4;

@interface APLSpaceScene : SKScene <SKPhysicsContactDelegate>

{

    BOOL     actions[kNumPlayerActions];

}

// These methods are used to create new nodes.

- (SKEmitterNode*)  newExplosionNode: (CFTimeInterval) explosionDuration;

- (SKNode*)         newMissileNode;

@end