Retired Document
Important: This sample code may not represent best practices for current development. The project may use deprecated symbols and illustrate technologies and techniques that are no longer recommended.
PongController.m
/* |
File: PongController.m |
Version: 1.0 |
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*/ |
/************************************************************* |
/* The PongController class moves the paddles and ball around |
/* the screen on a timer. |
/************************************************************/ |
#import "PongController.h" |
#import "PongAI.h" |
#import "PongView.h" |
#import "Shape.h" |
#define kUpdateInterval (1.0f / 60.0f) |
#define kUpdateDistance 4 |
#define kDownArrowKeyCode 125 |
#define kUpArrowKeyCode 126 |
#define kSpaceBarKeyCode 49 |
@implementation PongController |
- (void)awakeFromNib |
{ |
_ball = [[Shape alloc] initWithRect:NSZeroRect]; |
_leftPaddle = [[Shape alloc] initWithRect:NSZeroRect]; |
_rightPaddle = [[Shape alloc] initWithRect:NSZeroRect]; |
_court = [[Shape alloc] initWithRect:NSZeroRect]; |
_updateTimer = [NSTimer scheduledTimerWithTimeInterval:kUpdateInterval target:self selector:@selector(update) userInfo:nil repeats:YES]; |
[_tabView setDelegate:self]; |
// Load default AI script. |
NSString *scriptPath = [[NSBundle mainBundle] pathForResource:@"PongAI" ofType:@"js"]; |
NSString *script = [NSString stringWithContentsOfFile:scriptPath |
encoding:NSUTF8StringEncoding |
error:nil]; |
[_scriptView setFont:[NSFont fontWithName:@"Courier" size:18]]; |
[_scriptView setString:script]; |
[_scriptView setSelectedRange:NSMakeRange(0, 0)]; |
// Begin game. |
[self reset]; |
} |
- (void)dealloc |
{ |
[_tabView setDelegate:nil]; |
[_updateTimer invalidate]; |
[self setPongAI:nil]; |
[_ball release]; |
[_leftPaddle release]; |
[_rightPaddle release]; |
[_court release]; |
[super dealloc]; |
} |
/* Returns all shapes to their starting positions and allocates a new AI. */ |
- (void)reset |
{ |
NSRect rect; |
NSRect courtRect = [_pongView bounds]; |
[_court setRect:courtRect]; |
rect.size.width = 20; |
rect.size.height = 20; |
rect.origin.x = (NSMaxX(courtRect) / 2) - (rect.size.width / 2); |
rect.origin.y = NSMaxY(courtRect) - rect.size.height; |
[_ball setRect:rect]; |
rect.size.width = 10; |
rect.size.height = 99; |
rect.origin.x = 1; |
rect.origin.y = NSMaxY(courtRect) / 2 - rect.size.height / 2; |
[_leftPaddle setRect:rect]; |
rect.size.width = 10; |
rect.size.height = 99; |
rect.origin.x = NSMaxX(courtRect) - rect.size.width - 1; |
rect.origin.y = NSMaxY(courtRect) / 2 - rect.size.height / 2; |
[_rightPaddle setRect:rect]; |
_deltaX = -kUpdateDistance; |
_deltaY = -kUpdateDistance; |
[_pongView setBallRect:[_ball rect]]; |
[_pongView setLeftPaddleRect:[_leftPaddle rect]]; |
[_pongView setRightPaddleRect:[_rightPaddle rect]]; |
PongAI *pongAI = [[PongAI alloc] initWithPaddle:_rightPaddle |
ball:_ball |
script:[_scriptView string]]; |
[self setPongAI:pongAI]; |
[pongAI release]; |
} |
/* Moves paddles and ball. (Called on a timer.) */ |
- (void)update |
{ |
unsigned short keyCode = [[_pongView lastKeyDownEvent] keyCode]; |
// Spacebar |
if (keyCode == kSpaceBarKeyCode) { |
[self reset]; |
return; |
} |
// Exit off left side of screen |
if ([_ball right] < [_court left]) { |
[self reset]; |
return; |
} |
// Exit off right side of screen |
if ([_ball left] > [_court right]) { |
[self reset]; |
return; |
} |
// Move human paddle |
if (keyCode == kUpArrowKeyCode) { |
[_leftPaddle moveY:kUpdateDistance]; |
if ([_leftPaddle top] > [_court top] - 1) |
[_leftPaddle moveY:[_court top] - 1 - [_leftPaddle top]]; |
[_pongView setLeftPaddleRect:[_leftPaddle rect]]; |
} else if (keyCode == kDownArrowKeyCode) { |
[_leftPaddle moveY: -kUpdateDistance]; |
if ([_leftPaddle bottom] < [_court bottom] + 1) |
[_leftPaddle moveY: [_court bottom] + 1 - [_leftPaddle bottom]]; |
[_pongView setLeftPaddleRect:[_leftPaddle rect]]; |
} |
// Move AI paddle |
Direction direction = [[self pongAI] nextMove]; |
if (direction == kUpDirection) { |
[_rightPaddle moveY:kUpdateDistance]; |
if ([_rightPaddle top] > [_court top] - 1) |
[_rightPaddle moveY:[_court top] - 1 - [_rightPaddle top]]; |
[_pongView setRightPaddleRect:[_rightPaddle rect]]; |
} else if (direction == kDownDirection) { |
[_rightPaddle moveY: -kUpdateDistance]; |
if ([_rightPaddle bottom] < [_court bottom] + 1) |
[_rightPaddle moveY: [_court bottom] + 1 - [_rightPaddle bottom]]; |
[_pongView setRightPaddleRect:[_rightPaddle rect]]; |
} |
// Bounce off bottom of screen |
if ([_ball bottom] <= [_court bottom] + 1) { |
[_ball moveY:[_court bottom] + 1 - [_ball bottom]]; |
_deltaY = -_deltaY; |
} |
// Bounce off top of screen |
if ([_ball top] >= [_court top] - 1) { |
[_ball moveY:[_court top] - 1 - [_ball top]]; |
_deltaY = -_deltaY; |
} |
// Bounce off left paddle |
if ([[_leftPaddle rightFace] intersects:_ball]) { |
_deltaX = abs(_deltaX); |
if ([_ball middleY] > [_leftPaddle top] - ([_leftPaddle height] / 5)) { // top fifth |
_deltaY += kUpdateDistance; |
if (_deltaY == 0) |
_deltaY = kUpdateDistance; |
} else if ([_ball middleY] < [_leftPaddle bottom] + ([_leftPaddle height] / 5)) { // bottom fifth |
_deltaY -= kUpdateDistance; |
if (_deltaY == 0) |
_deltaY = -kUpdateDistance; |
} |
} |
// Bounce off right paddle |
if ([[_rightPaddle leftFace] intersects:_ball]) { |
_deltaX = -abs(_deltaX); |
if ([_ball middleY] < [_rightPaddle bottom] + ([_rightPaddle height] / 5)) { // bottom fifth |
_deltaY -= kUpdateDistance; |
if (_deltaY == 0) |
_deltaY = -kUpdateDistance; |
} else if([_ball middleY] > [_rightPaddle top] - ([_rightPaddle height] / 5)) { // top fifth |
_deltaY += kUpdateDistance; |
if (_deltaY == 0) |
_deltaY = kUpdateDistance; |
} |
} |
// Move ball |
[_ball moveX:_deltaX]; |
[_ball moveY:_deltaY]; |
[_pongView setBallRect:[_ball rect]]; |
} |
- (PongAI *)pongAI |
{ |
return [[_pongAI retain] autorelease]; |
} |
- (void)setPongAI:(PongAI *)pongAI |
{ |
if (_pongAI != pongAI) { |
[_pongAI release]; |
_pongAI = [pongAI retain]; |
} |
} |
@end |
@implementation PongController(NSTabViewDelegate) |
- (void)tabView:(NSTabView *)tabView willSelectTabViewItem:(NSTabViewItem *)tabViewItem |
{ |
if ([_pongView isDescendantOf:[tabViewItem view]]) { |
[self reset]; |
} |
} |
@end |
Copyright © 2007 Apple Inc. All Rights Reserved. Terms of Use | Privacy Policy | Updated: 2007-06-06