第二次在这里希望有人能指导我朝着正确的方向前进。
我试图在iOS设备（iPhone / iPod / iPad）的应用程序中实现Pong游戏，它运行得很好，除了我无法击败CPU，更不用说了得分。这是实现.m代码：
#import "BTM_pongGame.h"
#import <QuartzCore/QuartzCore.h>
#define STEP_DURATION 0.05
#define RESET_BALL_ANIMATION_DURATION 0.5f
#define MARGIN_WHERE_BALL_IS_LEAVING 40
//#define CPU_SKILL 20
@interface BTM_pongGame ()
@end
@implementation BTM_pongGame
@synthesize cpuSkill, ballShape;
- (void)viewDidLoad
{
[super viewDidLoad];
cpuSkill = [BT_strings getJsonPropertyValue:self.screenData.jsonVars nameOfProperty:@"cpuSkill" defaultValue:@"20"];
ballShape = [BT_strings getJsonPropertyValue:self.screenData.jsonVars nameOfProperty:@"ballShape" defaultValue:@"1"];
if ([ballShape isEqual: @"1"]) {
self.ball.layer.cornerRadius = self.ball.frame.size.width / 2;
} else {
//self.ball.layer.cornerRadius = self.ball.frame.size.width / 2;
}
}
- (void) wordsPerLineInfoShowAlert {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Choose Game"
message:@"Multiplayer or Single Player? You decide! Choose below."
delegate:self
cancelButtonTitle:@"Single Player"
otherButtonTitles:@"Go Back",@"Multi Player", nil];
[alert show];
}
- (void)alertView: (UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
NSString *title = [alertView buttonTitleAtIndex:buttonIndex];
if([title isEqualToString:@"Single Player"]) {
[self resetPlayerScoreLabels];
[self updatePlayerScoreLabels];
self.mode = kGameSinglePlayer;
[self moveComputerPaddle];
//Disable panning of computer paddle
[self.playerOne.superview setGestureRecognizers:@[]];
[self resetBoardForNewRound];
} else if ([title isEqualToString:@"Multi Player"]) {
[self resetPlayerScoreLabels];
[self updatePlayerScoreLabels];
self.mode = kGameMultiPlayer;
[self resetBoardForNewRound];
} else if ( [title isEqualToString:@"Go Back"]){
[self navLeftTap];
}
}
// thanks to MrsVanBeveren for coding the reset score stuff
-(void)resetPlayerScoreLabels
{
playerOneScore = 0;
playerTwoScore = 0;
}
-(void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
[self wordsPerLineInfoShowAlert];
[self startGameTimer];
}
-(void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
[_gameTimer invalidate];
}
-(void)quitPressed:(id)sender
{
[self dismissViewControllerAnimated:YES completion:nil];
}
-(void)startGameTimer
{
[_gameTimer invalidate];
_gameTimer = [NSTimer scheduledTimerWithTimeInterval:STEP_DURATION target:self selector:@selector(step:) userInfo:nil repeats:YES];
}
#pragma mark Game setup
/*
* Some maths to calculate a new starting direction
* By choosing mid left/right part of the unit circle
* we avoid getting straight up/down directions
*/
-(void)resetBallDirection
{
float randomUnity = arc4random_uniform(100)/100.0;
int horizontalDirection = (arc4random() % 2 ? 1 : -1);
float angle = M_PI_4 + randomUnity * M_PI_2;
float direction = horizontalDirection * angle;
dirX = sin(direction);
dirY = cos(direction);
}
-(void)resetBoardForNewRound
{
speed = self.view.frame.size.width / 50.0;
[self resetBallDirection];
[_gameTimer invalidate];
[UIView animateWithDuration:RESET_BALL_ANIMATION_DURATION animations:^{
self.ball.center = CGPointMake(self.view.bounds.size.width / 2.0, self.view.bounds.size.height / 2.0);
} completion:^(BOOL finished){
[self startGameTimer];
}];
[self enlargeAnimation:self.ball];
}
-(void)updatePlayerScoreLabels
{
self.playerOneScoreLabel.text = [NSString stringWithFormat:@"%d",playerOneScore];
self.playerTwoScoreLabel.text = [NSString stringWithFormat:@"%d",playerTwoScore];
}
#pragma mark Paddle handling
- (IBAction)paddlePanned:(UIPanGestureRecognizer*)recognizer {
UIView *paddleWrapper = recognizer.view;
UIView *paddle = [[paddleWrapper subviews] lastObject];
switch([recognizer state]) {
case UIGestureRecognizerStateBegan: {
paddle.backgroundColor = UIColor.whiteColor;
}
break;
case UIGestureRecognizerStateChanged: {
CGPoint position = [recognizer locationInView:self.view];
CGFloat haldPaddleHeight = paddleWrapper.frame.size.height / 2.0;
CGPoint newCenter = paddleWrapper.center;
newCenter.y = position.y;
newCenter.y = MAX(haldPaddleHeight, newCenter.y);
newCenter.y = MIN(self.view.bounds.size.height - haldPaddleHeight, newCenter.y);
paddleWrapper.center = newCenter;
}
break;
case UIGestureRecognizerStateEnded: {
paddle.backgroundColor = UIColor.grayColor;
}
break;
default:
break;
}
}
#pragma mark Game loop
/*
* Game loop
* - Moves the ball and checks for obstacles
*/
- (void)step:(NSTimer*)timer
{
speed += 0.05;
[self checkForBallLevingSide];
CGPoint newCenter = self.ball.center;
CGFloat ballRadius = self.ball.frame.size.height / 2.0;
newCenter.x += dirX * speed;
newCenter.y += dirY * speed;
CGFloat upperEdge = ballRadius;
CGFloat bottomEdge = self.view.bounds.size.height - ballRadius;
// Bounce ball of top/bottom walls
if (newCenter.y <= upperEdge) {
dirY = ABS(dirY);
newCenter.y = upperEdge;
} else if (newCenter.y >= bottomEdge) {
dirY = -ABS(dirY);
newCenter.y = bottomEdge;
}
[UIView animateWithDuration:STEP_DURATION animations:^{
self.ball.center = newCenter;
}];
}
-(BOOL)didBallHitPaddle:(UIView *)paddle withinLimit:(CGFloat)limit
{
if (CGRectIntersectsRect(paddle.frame, self.ball.frame)){
[self deflectBallFromPaddle:paddle];
CGRect ballFrame = self.ball.frame;
ballFrame.origin.x = limit;
self.ball.frame = ballFrame;
return YES;
} else
return NO;
}
-(void)checkForBallLevingSide
{
float limitLeft = MARGIN_WHERE_BALL_IS_LEAVING;
float limitRight = self.view.bounds.size.width - self.ball.frame.size.width - MARGIN_WHERE_BALL_IS_LEAVING;
CGRect ballFrame = self.ball.frame;
CGFloat ballX = ballFrame.origin.x;
if (ballX < limitLeft) {
if (![self didBallHitPaddle:self.playerOne.superview withinLimit:limitLeft])
[self playerDidMiss:kPlayerOne];
}else if (ballX > limitRight) {
if (![self didBallHitPaddle:self.playerTwo.superview withinLimit:limitRight])
[self playerDidMiss:kPlayerTwo];
}
}
/*
* Calculates new dirX and dirY after the bounce.
* The longer from the paddle's middle the bigger the result angle gets. (Pong style)
*/
-(void)deflectBallFromPaddle:(UIView *)paddle
{
dirX *= -1;
CGFloat diff = self.ball.center.y - paddle.center.y;
float p = diff / paddle.frame.size.height * 2.0f;
dirY += p * 0.5;
}
-(void)playerDidMiss:(kPlayer)player
{
if (player == kPlayerOne) {
playerTwoScore++;
[self victoryShake:self.playerTwo];
[self enlargeAnimation:self.playerTwoScoreLabel];
}
else if (player == kPlayerTwo) {
playerOneScore++;
[self victoryShake:self.playerOne];
[self enlargeAnimation:self.playerOneScoreLabel];
}
[self resetBoardForNewRound];
[self updatePlayerScoreLabels];
}
-(void)moveComputerPaddle
{
UIView *paddle = self.playerOne.superview;
CGPoint cpuCenter = paddle.center;
CGFloat diff = self.ball.center.y - paddle.center.y;
CGFloat movement = MIN((int)cpuSkill, ABS(diff));
movement *= diff > 0 ? 1 : -1;
cpuCenter.y += movement;
[UIView animateWithDuration:0.1 animations:^{
self.playerOne.superview.center = cpuCenter;
} completion:^(BOOL b) {
[self moveComputerPaddle];
}];
}
#pragma mark Animation
-(void)victoryShake:(UIView *)view
{
CAKeyframeAnimation * anim = [ CAKeyframeAnimation animationWithKeyPath:@"transform" ] ;
anim.values = [ NSArray arrayWithObjects:
[ NSValue valueWithCATransform3D:CATransform3DMakeTranslation(0.0f, -20.0f, 0.0f) ],
[ NSValue valueWithCATransform3D:CATransform3DMakeTranslation(0.0f, 20.0f, 0.0f) ],
nil ] ;
anim.autoreverses = YES ;
anim.repeatCount = 4.0f ;
anim.duration = 0.07f ;
[view.layer addAnimation:anim forKey:nil];
}
-(void)enlargeAnimation:(UIView *)view
{
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform"];
animation.fromValue = [NSValue valueWithCATransform3D:CATransform3DMakeScale(1.0, 1.0, 1.0)];
animation.toValue = [NSValue valueWithCATransform3D:CATransform3DMakeScale(3.0, 3.0, 1.0)];
[animation setDuration:RESET_BALL_ANIMATION_DURATION * 0.5];
animation.repeatCount = 1.0f ;
[animation setAutoreverses:YES];
[view.layer addAnimation:animation forKey:nil];
}
@end
我只是尝试更改其中#define CPU_SkILL再次@"cpuSkill" defaultValue:@"20"];的数字，但我没有改变任何方向的数字。
有什么想法吗？
提前谢谢。
答案 0 :(得分：0)
cpuSkill变量控制CPU控制的桨的移动：
CGFloat movement = MIN((int)cpuSkill, ABS(diff));
因此，在所有情况下，cpuSkill可能高于预期。尝试更低的值或在计算后对运动进行一些随机的微调。
此外，你应该ABS() cpuSkill以避免在负面移动时完美移动。