/*

     File: APLCompositeBehaviorViewController.m

 Abstract: Provides the "Pendulum (Composite Behavior)" demonstration.

  Version: 1.3

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 */

#import "APLCompositeBehaviorViewController.h"

#import "APLPendulumBehavior.H"

#import "APLDecorationView.h"

@interface APLCompositeBehaviorViewController ()

@property (nonatomic, weak) IBOutlet UIView *square;

@property (nonatomic, weak) IBOutlet UIImageView *attachmentPoint;

@property (nonatomic, strong) UIDynamicAnimator *animator;

@property (nonatomic, weak) APLPendulumBehavior *pendulumBehavior;

@end

@implementation APLCompositeBehaviorViewController

//| ----------------------------------------------------------------------------

- (void)viewDidLoad

{

    [super viewDidLoad];

    self.attachmentPoint.tintColor = [UIColor redColor];

    self.attachmentPoint.image = [self.attachmentPoint.image imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];

    // Visually show the connection between the attachmentPoint and the square.

    [(APLDecorationView*)self.view trackAndDrawAttachmentFromView:self.attachmentPoint toView:self.square withAttachmentOffset:CGPointMake(0, -0.95f * self.square.bounds.size.height/2)];

    UIDynamicAnimator *animator = [[UIDynamicAnimator alloc] initWithReferenceView:self.view];

    CGPoint pendulumAttachmentPoint = self.attachmentPoint.center;

    // An example of a high-level behavior simulating a simple pendulum.

    APLPendulumBehavior *pendulumBehavior = [[APLPendulumBehavior alloc] initWithWeight:self.square suspendedFromPoint:pendulumAttachmentPoint];

    [animator addBehavior:pendulumBehavior];

    self.pendulumBehavior = pendulumBehavior;

    self.animator = animator;

}

//| ----------------------------------------------------------------------------

//  IBAction for the Pan Gesture Recognizer that has been configured to track

//  touches in self.view.

//

- (IBAction)dragWeight:(UIPanGestureRecognizer*)gesture

{

    if (gesture.state == UIGestureRecognizerStateBegan)

        [self.pendulumBehavior beginDraggingWeightAtPoint:[gesture locationInView:self.view]];

    else if (gesture.state == UIGestureRecognizerStateEnded)

        [self.pendulumBehavior endDraggingWeightWithVelocity:[gesture velocityInView:self.view]];

    else if (gesture.state == UIGestureRecognizerStateCancelled)

    {

        gesture.enabled = YES;

        [self.pendulumBehavior endDraggingWeightWithVelocity:[gesture velocityInView:self.view]];

    }

    else if (!CGRectContainsPoint(self.square.bounds, [gesture locationInView:self.square]))

        // End the gesture if the user's finger moved outside square1's bounds.

        // This causes the gesture to transition to the cencelled state.

        gesture.enabled = NO;

    else

        [self.pendulumBehavior dragWeightToPoint:[gesture locationInView:self.view]];

}

@end