如何產卵隨機高度像笨鳥先飛CCSprites

Question

在的iOS遊戲飛揚的鳥，也有一定的距離後產生的管道和它們所產生的隨機高度

我也試圖讓飛揚的鳥管（我稱之爲代碼中的樹枝而不是管道）。除管道垂直而非水平運動，因爲它是一個垂直滾動遊戲（它滾動之類的遊戲doodle jump）

這是什麼，我想這是一個繪圖：https://docs.google.com/drawings/d/18bxsVsNOlScCvgi1mwuzD2At7R6xKM3QCh6BfAVMuMo/edit?usp=sharing （水平線是枝）

原來這就是我試圖到目前爲止做的，使垂直分支（或管道）...

在我.h

CCSprite *branch; 
NSMutableArray *_branches; 
CCSprite *obstacle; 
CCNode *previousBranch; 
CGFloat previousBranchYPosition; 

在我.m

@implementation HelloWorldLayer 

static const CGFloat firstBranchPosition = 426.f; 
static const CGFloat distanceBetweenBranches = 140.f; 
#define ARC4RANDOM_MAX  0x100000000 
static const CGFloat minimumXPositionRightBranch = 280.f; 
static const CGFloat maximumXPositionLeftBranch = 50.f; 
static const CGFloat pipeDistance = 100.f; 
static const CGFloat maximumXPositionRightBranch = maximumXPositionLeftBranch - pipeDistance; 

setBranchInitialPosition方法

/* This is where I am setting the initial position of the branches. 
So I am specifying the position of the first branch and the other branches after it so it gets placed every time a certain distance is passed. I have a left branch and a right branch*/ 
    -(void) setBranchInitialPosition { 
     CGFloat random = ((double)arc4random()/ARC4RANDOM_MAX); 
      CGFloat range = maximumXPositionRightBranch - minimumXPositionRightBranch; 

      _rightBranch.position = ccp(minimumXPositionRightBranch + (random * range), _rightBranch.position.y); 
      _leftBranch.position = ccp(_rightBranch.position.x + pipeDistance, _leftBranch.position.y); 
     } 

spawnNewBranches方法

// This is how I want the branches to spawn and I want to add them to an array full of branches 
    - (void)spawnNewBranches { 
     previousBranch = [_branches lastObject]; 
     previousBranchYPosition = previousBranch.position.y; 

     if (!previousBranch) { 
      // this is the first obstacle 
      previousBranchYPosition = firstBranchPosition; 
     } 

     _rightBranch = [CCSprite spriteWithFile:@"branch.png"]; 
     _leftBranch = [CCSprite spriteWithFile:@"branch.png"]; 
     [_leftBranch addChild:_rightBranch]; 
     [self setBranchInitialPosition]; 

     obstacle = [CCSprite node]; 
     [obstacle addChild:_leftBranch]; 


     obstacle.position = ccp(160, previousBranchYPosition + distanceBetweenBranches); 
     [self addChild:obstacle]; 
     [_branches addObject:obstacle]; 
    } 

scroll方法

-(void) scroll:(ccTime)dt 
{ 
    // moves the bg 
    background.position = ccp(screenCenter.x, background.position.y + [[NSUserDefaults standardUserDefaults] integerForKey:@"scrollSpeed"]*dt); 
    bg2.position = ccp(screenCenter.x, background.position.y-background.contentSize.height); 

    // it adds the new bg's to the screen before the old bg's move off the screen 
    if (background.position.y >= screenSize.height*1.5) 
    { 
     background.position = ccp(screenCenter.x, (screenCenter.y)-(background.size.height/2)); 
    } else if (bg2.position.y >= screenSize.height*1.5) { 
     bg2.position = ccp(screenCenter.x, (screenCenter.y)-(bg2.size.height/2)); 
    } 

     // This is where I want them to appear every certain distance and also move with the brackground 
    obstacle.position = ccp(obstacle.position.x, obstacle.position.y*[[NSUserDefaults standardUserDefaults] integerForKey:@"scrollSpeed"]*dt); 

    NSMutableArray *offScreenObstacles = nil; 
    if (obstacle.position.y >= screenSize.height*1.5) { 
     [offScreenObstacles addObject:obstacle]; 
    } 

    for (CCNode *obstacleToRemove in offScreenObstacles) { 
     [obstacleToRemove removeFromParent]; 
     [_branches removeObject:obstacleToRemove]; 
     // for each removed obstacle, add a new one 
     [self spawnNewBranches]; 
    } 

} 

現在，樹枝正在出現，但他們留在左下角，他們不會移動或產卵。我想讓它們隨着背景移動並在一定距離後產生，同時也在隨機高度生成。我向你提供了我所有的代碼，你知道我可以如何完成這項工作嗎？提前致謝！

Answer 1

您可能想嘗試基於三角曲線（如正弦或餘弦）來放置管道（https://en.wikipedia.org/wiki/Trigonometric_functions）。看起來你正在將管道放置在相當定義的隨機範圍內，儘管如果將此範圍更改爲三角曲線圖的偏移量，它將考慮到玩家更好地在開放間隙之間轉換的能力。至少這是我的感覺。我認爲代碼會更容易遵循，我也有點困惑。您還可以通過更改參數（如增加幅度或頻率）輕鬆改變曲線的難度。

Answer 2

我爲了好玩創建了一個Flappy Bird的副本。我用這個代碼來創建管道：

-(void)createPipes{ 

    //Create Random 
    int from = 65; 
    int max = [[UIScreen mainScreen] bounds].size.height - 124; 
    int delta = max - from - dy; 
    int y = from + arc4random() % (delta - from); 

    //Pipe Bottom 
    UIImageView *pipeBottom = [[UIImageView alloc] init]; 
    [pipeBottom setContentMode:UIViewContentModeTop]; 
    [pipeBottom setImage:[UIImage imageNamed:@"pipeBottom"]]; 
    [pipeBottom setFrame:CGRectMake(320, y+dy, 60, max - y - dy)]; 
    [pipeBottom setClipsToBounds:YES]; 

    //Pipe Top 
    UIImageView *pipeTop = [[UIImageView alloc] init]; 
    [pipeTop setFrame:CGRectMake(320, 0, 60, y)]; 
    [pipeTop setContentMode:UIViewContentModeBottom]; 
    [pipeTop setImage:[UIImage imageNamed:@"pipeTop"]]; 

    [self.view insertSubview:pipeTop atIndex:1]; 
    [self.view insertSubview:pipeBottom atIndex:1]; 

    if (!self.pipes) 
     self.pipes = [[NSMutableArray alloc] init]; 

    [self.pipes addObject:pipeBottom]; 
    [self.pipes addObject:pipeTop]; 

} 

和將它們移至：

-(void)moveArray:(NSMutableArray *)array{ 
    float ds = dv * dt; 
    NSMutableArray *trash = [NSMutableArray array]; 
    for (UIImageView *obj in array) { 
     CGRect frame = obj.frame; 
     frame.origin.x -= ds; 
     if (frame.origin.x < -frame.size.width) { 
      [obj removeFromSuperview]; 
      [trash addObject:obj]; 
     }else{ 
      obj.frame = frame; 
     } 
    } 
    [array removeObjectsInArray:trash]; 
} 
-(void)movePipes{ 
    [self moveArray:self.pipes]; 
} 

我調用這個函數每隔0.01秒，運行遊戲：

-(void)runGame{ 
    _time += dt; 
    if (_time >= 180.0/dv) { 
     _time = 0; 
     [self createPipes]; 
    } 
    [self movePipes]; 
    [self moveEnemies]; 
    [self moveYoshi]; 
    [self moveBar]; 
    [self verifyScore]; 
    [self verifyCollision]; 
    [self verifyState]; 
} 

我定義dt = 0.01和dv = 110。

你可以看到我在YouTube的模仿：（​​）

我希望這可以幫助您。

Best，Rafael Castro。