crashlandingappdelegate.m

在iPhone OS上使用用Objective-C语言开发的Demo程序

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===== IMPORTANT =====

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=====================

File: CrashLandingAppDelegate.m
Abstract: The UIApplication delegate class, which is the central controller of
the application.

Version: 1.6

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*/

#import <mach/mach_time.h>
#import "CrashLandingAppDelegate.h"
#import "MyEAGLView.h"
#import "SoundEngine.h"

// CONSTANTS
#define kUserNameDefaultKey			@"userName"   // NSString
#define kHighScoresDefaultKey		@"highScores" // NSArray of NSStrings

#define kAccelerometerFrequency		100 // Hz
#define kFilteringFactor			0.1 // For filtering out gravitational affects

#define kRenderingFPS				30.0 // Hz

#define kListenerDistance			1.0  // Used for creating a realistic sound field

// MACROS
// Converts degrees to radians for calculating the orientation of the rocket.
#define DEGREES_TO_RADIANS(__ANGLE__) ((__ANGLE__) / 180.0 * M_PI)

// Used to randomize the starting condtions of the game
#define RANDOM_SEED() srandom((unsigned)(mach_absolute_time() & 0xFFFFFFFF))

// Used to randomize the position of the base the rocket must land on.
#define RANDOM_FLOAT() ((float)random() / (float)INT32_MAX)

// CLASS INTERFACE
@interface CrashLandingAppDelegate ()
- (void) renderScene;
- (void) resetGame;
- (void) saveScore;
@end

// CLASS IMPLEMENTATIONS
@implementation CrashLandingAppDelegate

+ (void) initialize {
	if(self == [CrashLandingAppDelegate class]) {
		RANDOM_SEED();
		//Make sure we have a default set of high-scores in the preferences
		[[NSUserDefaults standardUserDefaults] registerDefaults:[NSDictionary dictionaryWithObject:[NSArray array] forKey:kHighScoresDefaultKey]];
	}
}

- (void) applicationDidFinishLaunching:(UIApplication*)application {
	NSBundle*				bundle = [NSBundle mainBundle];
	CGRect					rect = [[UIScreen mainScreen] bounds];	
	
	// Set up variable for starting the game
	_firstTap = YES;
	
	//Create and editable text field. This is used only when the user successfully lands the rocket.
	_textField = [[UITextField alloc] initWithFrame:CGRectMake(60, 214, 200, 30)];
	[_textField setDelegate:self];
	[_textField setBackgroundColor:[UIColor colorWithWhite:0.0 alpha:0.5]];
	[_textField setTextColor:[UIColor whiteColor]];
	[_textField setFont:[UIFont fontWithName:kFontName size:kStatusFontSize]];
	[_textField setPlaceholder:@"Tap to edit"];	
	
	//Set up OpenGL projection matrix
	glMatrixMode(GL_PROJECTION);
	glOrthof(0, rect.size.width, 0, rect.size.height, -1, 1);
	glMatrixMode(GL_MODELVIEW);
	
	//Initialize OpenGL states
	glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
	glEnable(GL_TEXTURE_2D);
	glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
	glEnableClientState(GL_VERTEX_ARRAY);
	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
	
	//Loadthe  background texture and configure it
	_textures[kTexture_Title] = [[Texture2D alloc] initWithImage: [UIImage imageNamed:@"Title.png"]];
	glBindTexture(GL_TEXTURE_2D, [_textures[kTexture_Title] name]);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
	
	//Load other textures
	_textures[kTexture_Lander] = [[Texture2D alloc] initWithImage: [UIImage imageNamed:@"Ship.png"]];
	_textures[kTexture_Base] = [[Texture2D alloc] initWithImage: [UIImage imageNamed:@"Platform.png"]];
	_textures[kTexture_MainThrust] = [[Texture2D alloc] initWithImage: [UIImage imageNamed:@"ThrustMiddle.png"]];
	_textures[kTexture_LeftThrust] = [[Texture2D alloc] initWithImage: [UIImage imageNamed:@"ThrustLeft.png"]];
	_textures[kTexture_RightThrust] = [[Texture2D alloc] initWithImage: [UIImage imageNamed:@"ThrustRight.png"]];
	_textures[kTexture_Explosion] = [[Texture2D alloc] initWithImage: [UIImage imageNamed:@"Explosion.png"]];
	_textures[kTexture_FuelBar] = [[Texture2D alloc] initWithImage: [UIImage imageNamed:@"EmptyFuelBar.png"]];
	_textures[kTexture_FuelLevel] = [[Texture2D alloc] initWithImage: [UIImage imageNamed:@"FuelBar.png"]];
	_textures[kTexture_LightGreen] = [[Texture2D alloc] initWithImage: [UIImage imageNamed:@"LightGreen.png"]];
	_textures[kTexture_LightRed] = [[Texture2D alloc] initWithImage: [UIImage imageNamed:@"LightRed.png"]];
	_textures[kTexture_LabelSpeed] = [[Texture2D alloc] initWithString:@"Speed" dimensions:CGSizeMake(64, 32) alignment:UITextAlignmentLeft fontName:kFontName fontSize:kLabelFontSize];
	_textures[kTexture_LabelAngle] = [[Texture2D alloc] initWithString:@"Angle" dimensions:CGSizeMake(64, 32) alignment:UITextAlignmentLeft fontName:kFontName fontSize:kLabelFontSize];
	_textures[kTexture_LabelPosition] = [[Texture2D alloc] initWithString:@"Position" dimensions:CGSizeMake(64, 32) alignment:UITextAlignmentLeft fontName:kFontName fontSize:kLabelFontSize];
	
	// Note that each of the Sound Engine functions defined in SoundEngine.h return an OSStatus value.
	// Although the code in this application does not check for errors, you'll want to add error checking code 
	// in your own application, particularly during development.
	//Setup sound engine. Run  it at 44Khz to match the sound files
	SoundEngine_Initialize(44100);
	// Assume the listener is in the center at the start. The sound will pan as the position of the rocket changes.
	SoundEngine_SetListenerPosition(0.0, 0.0, kListenerDistance);
	// Load each of the four sounds used in the game.
	SoundEngine_LoadEffect([[bundle pathForResource:@"Start" ofType:@"caf"] UTF8String], &_sounds[kSound_Start]);
	SoundEngine_LoadEffect([[bundle pathForResource:@"Success" ofType:@"caf"] UTF8String], &_sounds[kSound_Success]);
	SoundEngine_LoadEffect([[bundle pathForResource:@"Failure" ofType:@"caf"] UTF8String], &_sounds[kSound_Failure]);
	SoundEngine_LoadLoopingEffect([[bundle pathForResource:@"Thrust" ofType:@"caf"] UTF8String], NULL, NULL, &_sounds[kSound_Thrust]);
	
	// Compute the land's "bounds"
	_landerBounds = CGRectMake(0, 0, 84, 66);
	_landerBounds = CGRectOffset(_landerBounds, -_landerBounds.size.width / 2, -_landerBounds.size.height / 2);
	
	//Show window
//	[_window makeKeyAndVisible];
	
	//Configure and start accelerometer
	[[UIAccelerometer sharedAccelerometer] setUpdateInterval:(1.0 / kAccelerometerFrequency)];
	[[UIAccelerometer sharedAccelerometer] setDelegate:self];
	
	//Render the Title frame 
	glDisable(GL_BLEND);
	[_textures[kTexture_Title] drawInRect:[glView bounds]];
	glEnable(GL_BLEND);
	
	//Swap the framebuffer
	[glView swapBuffers];
}

// Release resources when they are no longer needed
- (void) dealloc {
	unsigned			i;
	
	[_statusTexture release];	
	SoundEngine_Teardown();	
	for(i = 0; i < kNumTextures; ++i)
		[_textures[i] release];	
	[_textField release];
	[glView release];
	[window release];
	
	[super dealloc];
}

// Implement this method to get the lastest data from the accelerometer 
- (void)accelerometer:(UIAccelerometer*)accelerometer didAccelerate:(UIAcceleration*)acceleration {
	//Use a basic low-pass filter to only keep the gravity in the accelerometer values
	_accelerometer[0] = acceleration.x * kFilteringFactor + _accelerometer[0] * (1.0 - kFilteringFactor);
	_accelerometer[1] = acceleration.y * kFilteringFactor + _accelerometer[1] * (1.0 - kFilteringFactor);
	_accelerometer[2] = acceleration.z * kFilteringFactor + _accelerometer[2] * (1.0 - kFilteringFactor);
}

// Saves the user name and score after the user enters it in the provied text field. 
- (void)textFieldDidEndEditing:(UITextField*)textField {
	//Save name
	[[NSUserDefaults standardUserDefaults] setObject:[textField text] forKey:kUserNameDefaultKey];
	
	//Save the score
	[self saveScore];
}

// Terminates the editing session
- (BOOL)textFieldShouldReturn:(UITextField*)textField {
	//Terminate editing
	[textField resignFirstResponder];
	
	return YES;
}

// Called by touchesEnded:withEvent: when the user taps the screen
- (void)handleTap {
	
	if (_firstTap){ // Replace the title screen with the background
		//Load background texture and configure it
		_textures[kTexture_Background] = [[Texture2D alloc] initWithImage:[UIImage imageNamed:@"Background.png"]];
		glBindTexture(GL_TEXTURE_2D, [_textures[kTexture_Background] name]);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
		//Reset
		[self resetGame];
		_firstTap = NO;
	} else { // Either the user tapped to start a new game or the user successfully landed the rocket.
		//Stop rendering timer
		[_timer invalidate];
		_timer = nil;
		
		//In the lander was landed successfully, save the current score or start a new game
		if(_state == kState_Success)
			[self saveScore];