/*

     File: PaintingViewController.m

 Abstract: The central controller of the application.

  Version: 1.13

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 */

#import "PaintingViewController.h"

#import "PaintingView.h"

#import "SoundEffect.h"

//CONSTANTS:

#define kBrightness             1.0

#define kSaturation             0.45

#define kPaletteHeight          30

#define kPaletteSize            5

#define kMinEraseInterval       0.5

// Padding for margins

#define kLeftMargin             10.0

#define kTopMargin              10.0

#define kRightMargin            10.0

//CLASS IMPLEMENTATIONS:

@interface PaintingViewController()

{

    SoundEffect         *erasingSound;

    SoundEffect         *selectSound;

    CFTimeInterval      lastTime;

}

@end

@implementation PaintingViewController

- (void)viewDidLoad

{

    [super viewDidLoad];

    // Create a segmented control so that the user can choose the brush color.

    // Create the UIImages with the UIImageRenderingModeAlwaysOriginal rendering mode. This allows us to show the actual image colors in the segmented control.

    UISegmentedControl *segmentedControl = [[UISegmentedControl alloc] initWithItems:

                                            [NSArray arrayWithObjects:

                                             [[UIImage imageNamed:@"Red"]       imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal],

                                             [[UIImage imageNamed:@"Yellow"]    imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal],

                                             [[UIImage imageNamed:@"Green"]     imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal],

                                             [[UIImage imageNamed:@"Blue"]      imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal],

                                             [[UIImage imageNamed:@"Purple"]    imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal],

                                             nil]];

    // Compute a rectangle that is positioned correctly for the segmented control you'll use as a brush color palette

    CGRect rect = [[UIScreen mainScreen] bounds];

    CGRect frame = CGRectMake(rect.origin.x + kLeftMargin, rect.size.height - kPaletteHeight - kTopMargin, rect.size.width - (kLeftMargin + kRightMargin), kPaletteHeight);

    segmentedControl.frame = frame;

    // When the user chooses a color, the method changeBrushColor: is called.

    [segmentedControl addTarget:self action:@selector(changeBrushColor:) forControlEvents:UIControlEventValueChanged];

    // Make sure the color of the color complements the black background

    segmentedControl.tintColor = [UIColor darkGrayColor];

    // Set the third color (index values start at 0)

    segmentedControl.selectedSegmentIndex = 2;

    // Add the control to the window

    [self.view addSubview:segmentedControl];

    // Now that the control is added, you can release it

    // Define a starting color

    CGColorRef color = [UIColor colorWithHue:(CGFloat)2.0 / (CGFloat)kPaletteSize

                                  saturation:kSaturation

                                  brightness:kBrightness

                                       alpha:1.0].CGColor;

    const CGFloat *components = CGColorGetComponents(color);

    // Defer to the OpenGL view to set the brush color

    [(PaintingView *)self.view setBrushColorWithRed:components[0] green:components[1] blue:components[2]];

    // Load the sounds

    NSBundle *mainBundle = [NSBundle mainBundle];

    erasingSound = [[SoundEffect alloc] initWithContentsOfFile:[mainBundle pathForResource:@"Erase" ofType:@"caf"]];

    selectSound =  [[SoundEffect alloc] initWithContentsOfFile:[mainBundle pathForResource:@"Select" ofType:@"caf"]];

    // Erase the view when recieving a notification named "shake" from the NSNotificationCenter object

    // The "shake" nofification is posted by the PaintingWindow object when user shakes the device

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(eraseView) name:@"shake" object:nil];

}

- (void)viewDidAppear:(BOOL)animated

{

    [super viewDidAppear:animated];

    [self becomeFirstResponder];

}

- (BOOL)canBecomeFirstResponder

{

    return YES;

}

// Release resources when they are no longer needed,

- (void)dealloc

{

    [[NSNotificationCenter defaultCenter] removeObserver:self];

}

// Change the brush color

- (void)changeBrushColor:(id)sender

{

    // Play sound

    [selectSound play];

    // Define a new brush color

    CGColorRef color = [UIColor colorWithHue:(CGFloat)[sender selectedSegmentIndex] / (CGFloat)kPaletteSize

                                  saturation:kSaturation

                                  brightness:kBrightness

                                       alpha:1.0].CGColor;

    const CGFloat *components = CGColorGetComponents(color);

    // Defer to the OpenGL view to set the brush color

    [(PaintingView *)self.view setBrushColorWithRed:components[0] green:components[1] blue:components[2]];

}

// Called when receiving the "shake" notification; plays the erase sound and redraws the view

- (void)eraseView

{

    if(CFAbsoluteTimeGetCurrent() > lastTime + kMinEraseInterval) {

        [erasingSound play];

        [(PaintingView *)self.view erase];

        lastTime = CFAbsoluteTimeGetCurrent();

    }

}

// We do not support auto-rotation in this sample

- (BOOL)shouldAutorotate

{

    return NO;

}

#pragma mark Motion

- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event

{

    if (motion == UIEventSubtypeMotionShake)

    {

        // User was shaking the device. Post a notification named "shake".

        [[NSNotificationCenter defaultCenter] postNotificationName:@"shake" object:self];

    }

}

@end