WormView.m
/* |
File: WormView.m |
Abstract: Implements the basic view class for the WormView. Various subclasses show off varying degrees of optimizations. |
Version: 1.2 |
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*/ |
#import "WormView.h" |
#define MAX_WORM_LENGTH 1000 |
#define WIDTH_QUANTUM 22 |
#define HEIGHT_QUANTUM 22 |
#define DEFAULT_LENGTH 19 |
@implementation WormView |
- (id)initWithFrame:(NSRect)frame { |
self = [super initWithFrame:frame]; |
if (self) { |
srandom((int)time(NULL)); |
wormPositions = malloc(MAX_WORM_LENGTH * sizeof(GamePosition)); |
wormTextAttributes = [[NSDictionary alloc] initWithObjectsAndKeys: |
[NSFont boldSystemFontOfSize:16.0], NSFontAttributeName, |
nil]; |
backgroundColor = [[NSColor colorWithPatternImage:[NSImage imageNamed:@"Background Pattern"]] copy]; |
[self setString:NSLocalizedString(@"Default Worm String", "The string to be used for the worm's body")]; |
[self setInitialLength:DEFAULT_LENGTH]; |
[self setDesiredFrameRate:5000.0f]; |
[self reset]; |
} |
return self; |
} |
- (void)dealloc { |
[self stop:YES]; |
[wormString release]; |
[wormTextAttributes release]; |
[backgroundColor release]; |
[super dealloc]; |
} |
// Manage the score |
- (NSInteger)score { |
return score; |
} |
- (void)setScore:(NSInteger)newScore { |
score = newScore; |
[controller scoreChanged:self]; |
} |
// Managing the controller |
- (void)setController:(WormController *)obj { |
controller = obj; |
} |
- (WormController *)controller { |
return controller; |
} |
// Set/get the string which makes up the worm's body |
- (void)setString:(NSString *)string { |
if (string != wormString) { |
[wormString release]; |
wormString = [[string uppercaseString] copy]; |
} |
} |
- (NSString *)string { |
return [[wormString retain] autorelease]; |
} |
// Called once for each frame of the animation |
- (BOOL)performAnimation { |
BOOL gameOverFlag; |
gameOverFlag = [self updateState]; |
[self setNeedsDisplay:YES]; |
return gameOverFlag; |
} |
// Draw the game area, worm, and target |
- (void)drawRect:(NSRect)rect { |
NSUInteger i; |
NSRect tRect; |
[backgroundColor set]; |
NSRectFill([self bounds]); |
for (i = 0; i < wormLength; i++) { |
NSRect wRect = [self rectForPosition:wormPositions[i]]; |
NSUInteger characterIndex = i % [wormString length]; |
NSString *string = [wormString substringWithRange:NSMakeRange(characterIndex, 1)]; |
[string drawInRect:wRect withAttributes: wormTextAttributes]; |
} |
tRect = [self rectForPosition:targetPosition]; |
[[NSColor blackColor] set]; |
[[NSBezierPath bezierPathWithOvalInRect:NSInsetRect(tRect, 2, 2)] fill]; |
} |
// Coordinates are based on top left corner |
- (BOOL)isFlipped { |
return YES; |
} |
// On click, become first responder |
- (BOOL)acceptsFirstResponder { |
return YES; |
} |
// Keyboard handling |
- (void)keyDown:(NSEvent *)event { |
NSString *keys = [event charactersIgnoringModifiers]; |
wormHeading = kGameHeadingStraight; |
if (keys && [keys length] > 0) { |
unichar c = [keys characterAtIndex:0]; |
if (c == NSLeftArrowFunctionKey) { |
wormHeading = kGameHeadingLeft; |
} else if (c == NSRightArrowFunctionKey) { |
wormHeading = kGameHeadingRight; |
} |
} |
} |
- (void)setInitialLength:(NSUInteger)length { |
initialWormLength = (length > 1) ? length : 1; |
} |
- (void)setDesiredFrameRate:(float)rate { |
desiredFrameRate = (rate > 0) ? rate : 1.0f; |
if (wormTimer) [self start]; |
} |
- (float)desiredFrameRate { |
return desiredFrameRate; |
} |
- (float)actualFrameRate { |
return actualFrameRate; |
} |
- (BOOL)autoturnAtWalls { |
return YES; |
} |
- (void)stampTime { |
CFAbsoluteTime time = CFAbsoluteTimeGetCurrent(); |
if (time > timeStamp) { |
actualFrameRate = (float) (actualFrameRate + 1.0f / (time - timeStamp)) / 2.0f; |
} |
timeStamp = time; |
} |
void wormTimerCallBack(CFRunLoopTimerRef timer, void *info) { |
WormView *self = (WormView *)info; |
CFAbsoluteTime startTime = CFAbsoluteTimeGetCurrent(); |
BOOL gameOverFlag = [self performAnimation]; |
[self displayIfNeeded]; |
[self stampTime]; |
if (gameOverFlag) { |
[self stop:YES]; |
} else { |
CFRunLoopTimerSetNextFireDate(timer, startTime + CFRunLoopTimerGetInterval(timer)); |
} |
} |
- (void)start { |
if (gameOver) [self reset]; |
gameOver = NO; |
if (!wormTimer) { |
CFRunLoopTimerContext context = {0, self, NULL, NULL, NULL}; |
timeStamp = CFAbsoluteTimeGetCurrent(); |
wormTimer = CFRunLoopTimerCreate(NULL, timeStamp, 1.0/[self desiredFrameRate], 0, 0, wormTimerCallBack, &context); |
CFRunLoopAddTimer(CFRunLoopGetCurrent(), wormTimer, kCFRunLoopCommonModes); |
[controller gameStatusChanged:self]; |
} |
} |
- (void)stop:(BOOL)flag { |
if (!gameOver && flag) gameOver = YES; |
if (wormTimer) { |
CFRunLoopTimerInvalidate(wormTimer); |
CFRelease(wormTimer); |
wormTimer = NULL; |
[controller gameStatusChanged:self]; |
} |
} |
- (BOOL)gameIsRunning { |
return wormTimer != NULL; |
} |
- (BOOL)gameIsOver { |
return gameOver; |
} |
- (BOOL)updateState { |
NSSize size = [self bounds].size; |
NSUInteger width = size.width / WIDTH_QUANTUM, height = size.height / HEIGHT_QUANTUM; |
GameState state = worm_guts(wormPositions, (unsigned long *)&wormLength, &wormDirection, &wormHeading, &targetPosition, width > 0 ? width : 1, height > 0 ? height : 1, [self autoturnAtWalls] ? 0 : 1); |
if (state == kGameStateScore) [self setScore:score + 1]; |
return (state == kGameStateCrash); |
} |
- (NSRect)rectForPosition:(GamePosition)position { |
return NSMakeRect(position.x * WIDTH_QUANTUM, position.y * HEIGHT_QUANTUM, WIDTH_QUANTUM, HEIGHT_QUANTUM); |
} |
- (NSRect)integralRectForRect:(NSRect)rect { |
NSRect scaleRect = NSIntegralRect(NSMakeRect(rect.origin.x / WIDTH_QUANTUM, rect.origin.y / HEIGHT_QUANTUM, rect.size.width / WIDTH_QUANTUM, rect.size.height / HEIGHT_QUANTUM)); |
return NSMakeRect(scaleRect.origin.x * WIDTH_QUANTUM, scaleRect.origin.y * HEIGHT_QUANTUM, scaleRect.size.width * WIDTH_QUANTUM, scaleRect.size.height * HEIGHT_QUANTUM); |
} |
- (void)reset { |
NSUInteger i; |
[self stop:NO]; |
wormLength = initialWormLength - 1; |
for (i = 0; i < wormLength; i++) { |
wormPositions[i].x = -1; |
wormPositions[i].y = 0; |
} |
targetPosition.x = -1; |
targetPosition.y = 0; |
wormDirection = kGameDirectionEast; |
wormHeading = kGameHeadingStraight; |
actualFrameRate = 0.0f; |
[self setScore:0]; |
[self setNeedsDisplay:YES]; |
} |
@end |
Copyright © 2012 Apple Inc. All Rights Reserved. Terms of Use | Privacy Policy | Updated: 2012-06-04