/*

     File: APLAttachmentsViewController.m

 Abstract: Provides the "Attachments + Collision" demonstration.

  Version: 1.3

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 */

#import "APLAttachmentsViewController.h"

#import "APLDecorationView.h"

@interface APLAttachmentsViewController ()

@property (nonatomic, weak) IBOutlet UIView *square1;

//! The view that displays the attachment point on square1.

@property (nonatomic, weak) IBOutlet UIImageView *square1AttachmentView;

//! The view that the user drags to move square1.

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

@property (nonatomic, strong) UIDynamicAnimator *animator;

@property (nonatomic, strong) UIAttachmentBehavior *attachmentBehavior;

@end

@implementation APLAttachmentsViewController

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

- (void)viewDidLoad

{

    [super viewDidLoad];

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

    UICollisionBehavior *collisionBehavior = [[UICollisionBehavior alloc] initWithItems:@[self.square1]];

    // Creates collision boundaries from the bounds of the dynamic animator's

    // reference view (self.view).

    collisionBehavior.translatesReferenceBoundsIntoBoundary = YES;

    [animator addBehavior: collisionBehavior];

    CGPoint squareCenterPoint = CGPointMake(self.square1.center.x, self.square1.center.y - 110.0);

    UIOffset attachmentPoint = UIOffsetMake(-25.0, -25.0);

    // By default, an attachment behavior uses the center of a view. By using a

    // small offset, we get a more interesting effect which will cause the view

    // to have rotation movement when dragging the attachment.

    UIAttachmentBehavior *attachmentBehavior = [[UIAttachmentBehavior alloc] initWithItem:self.square1 offsetFromCenter:attachmentPoint attachedToAnchor:squareCenterPoint];

    [animator addBehavior:attachmentBehavior];

    self.attachmentBehavior = attachmentBehavior;

    // Visually show the attachment points

    self.attachmentView.center = attachmentBehavior.anchorPoint;

    self.attachmentView.tintColor = [UIColor redColor];

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

    self.square1AttachmentView.center = CGPointMake(25.0, 25.0);

    self.square1AttachmentView.tintColor = [UIColor blueColor];

    self.square1AttachmentView.image = [self.square1AttachmentView.image imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];

    // Visually show the connection between the attachment points.

    [(APLDecorationView*)self.view trackAndDrawAttachmentFromView:self.attachmentView toView:self.square1 withAttachmentOffset:CGPointMake(-25.0, -25.0)];

    self.animator = animator;

}

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

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

//  touches in self.view.

//

- (IBAction)handleAttachmentGesture:(UIPanGestureRecognizer*)gesture

{

    [self.attachmentBehavior setAnchorPoint:[gesture locationInView:self.view]];

    self.attachmentView.center = self.attachmentBehavior.anchorPoint;

}

@end