我在Cocos2d制作游戏。我希望敌人在屏幕的右侧和左侧产生,并移动到屏幕上的随机点,然后重复。尽管我付出了努力,但我无法弄明白。这应该相对容易回答,它应该看起来像Ray Wenderlich的教程之一。有些代码会很好。谢谢!
答案 0 :(得分:1)
这是来自Ray Wanderlich教程的代码..
[self schedule:@selector(addTarget) interval:2.0];
-(void)addTarget {
CCSprite *target = [CCSprite spriteWithFile:@"Target.jpg"
rect:CGRectMake(0, 0, 27, 40)]; //Creating Sprite and setting rect
// Determine where to spawn the target along the Y axis
CGSize winSize = [[CCDirector sharedDirector] winSize]; //Get the screensize
int minY = target.contentSize.height/2;
int maxY = winSize.height - target.contentSize.height/2;
int rangeY = maxY - minY;
int actualY = (arc4random() % rangeY) + minY;
// Create the target slightly off-screen along the right edge,
// and along a random position along the Y axis as calculated above
target.position = ccp(winSize.width + (target.contentSize.width/2), actualY);
[self addChild:target];
// Determine speed of the target
int minDuration = 2.0;
int maxDuration = 4.0;
int rangeDuration = maxDuration - minDuration;
int actualDuration = (arc4random() % rangeDuration) + minDuration;
// Create the actions
id actionMove = [CCMoveTo actionWithDuration:actualDuration
position:ccp(-target.contentSize.width/2, actualY)];
id actionMoveDone = [CCCallFuncN actionWithTarget:self
selector:@selector(spriteMoveFinished:)];
[target runAction:[CCSequence actions:actionMove, actionMoveDone, nil]];
}
minY - >位于屏幕底部的位置 maxY --->位于屏幕顶部的位置。 rangeY --->屏幕的高度。 actualY --->计算屏幕底部和屏幕顶部之间的随机点。
target.position - >设置精灵移动的随机位置。
actualDuration - >获得随机持续时间。因此精灵会以不同的时间延迟移动。
actionMove - >创建Move动作。 actionMoveDone --->完成移动操作后,调用spriteMoveFinished来删除sprite。