Classes/PaintingViewController.m
/* |
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 |
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