碰撞检测

Question

我正在尝试创建一种碰撞检测方法，检查我的两个物体（2个椭圆形的uiimages）是否相互碰撞。如果他们这样做，应将BOOL值设置为YES，否则应将其设置为NO。

到目前为止，它只是进入IF语句，检查Ruby1是否高于Ruby2。它不关心ruby1是否低于ruby2，甚至不在其左侧或右侧。它只是继续进行IF声明。反之亦然。

-(void)CollisionDetect{


//can't be colliding because Ruby1 is too far left of Ruby2

if( rubin1.frame.origin.x + rubin1.bounds.size.width < rubin2.frame.origin.x){

    CollisionRubies = NO;
    NSLog(@"Collision left");
}

//can't be colliding because Ruby1 is too far right of Ruby2

if( rubin1.frame.origin.x > rubin2.frame.origin.x + rubin2.bounds.size.width){

    CollisionRubies = NO;
    NSLog(@"Collision right");
}

//can't be colliding because Ruby1 is too far below Ruby2

if( rubin1.frame.origin.y + rubin1.bounds.size.width < rubin2.frame.origin.y){
    CollisionRubies = NO;
    NSLog(@"Collision below");
}

//can't be colliding because Ruby1 is too far above Ruby2

if( rubin1.frame.origin.y < rubin2.frame.origin.y + rubin2.bounds.size.width){
    CollisionRubies = NO;
    NSLog(@"Collision above");
}

    if( rubin2.frame.origin.x + rubin2.bounds.size.width < rubin1.frame.origin.x){

    CollisionRubies = NO;
    NSLog(@"Collision left");
}

//can't be colliding because Ruby2 is too far right of Ruby1

if( rubin2.frame.origin.x > rubin1.frame.origin.x + rubin1.bounds.size.width){

    CollisionRubies = NO;
    NSLog(@"Collision right");
}

//can't be colliding because Ruby2 is too far below Ruby1

if( rubin2.frame.origin.y + rubin2.bounds.size.width < rubin1.frame.origin.y){
    CollisionRubies = NO;
    NSLog(@"Collision below");
}

//can't be colliding because Ruby2 is too far above Ruby1

if( rubin2.frame.origin.y < rubin1.frame.origin.y + rubin1.bounds.size.width){
    CollisionRubies = NO;
    NSLog(@"Collision above");
}

//if we get here, the two rects MUST be colliding
CollisionRubies = YES;
NSLog(@"Collision detected");

}

如果BOOL值为NO，那么ruby1将移动到该位置，如下面的代码所示，否则它将停止移动，直到它检测到ruby2不在它前面。反之亦然。

-(void)dispatchTouchEvent:(UIView *)theView toPosition:(CGPoint)position{
// Check to see which view, or views,  the point is in and then move to that position.
if (CGRectContainsPoint([rubin1 frame], position)) {

    if(!CollisionRubies){

        rubin1.center = position;
    }
     if (CGRectContainsPoint([rubin2 frame], position)) {

    if(!CollisionRubies){

        rubin2.center = position;
    }


}

从touchesmoved方法

调用碰撞检测方法

 - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {

[self CollisionDetect];

 NSLog(@"touchesMoved");
 if(!GamePaused){
         // Enumerates through all touch objects
         for (UITouch *touch in touches) {

             // Send to the dispatch method, which will make sure the appropriate subview is acted upon
             [self dispatchTouchEvent:[touch view] toPosition:[touch locationInView:self.view]];
         }
 }

我做错了什么？

的 的 ** * ** * ** * 的* 更新的 * ** * ** * ** * ** * ** * ** * ** * ** * ** * ***

-(void)CollisionDetect{

//不能碰撞，因为Ruby1离Ruby2太远了

if（rubin1.frame.origin.x + rubin1.bounds.size.width＆lt; rubin2.frame.origin.x）{

CollisionRubies = NO;
NSLog(@"Collision left");

}

//不能发生冲突，因为Ruby1对Ruby2来说太过分了

else if（rubin1.frame.origin.x＆gt; rubin2.frame.origin.x + rubin2.bounds.size.width）{

CollisionRubies = NO;
NSLog(@"Collision right");

}

//不能发生冲突，因为Ruby1远远低于Ruby2

else if（rubin1.frame.origin.y + rubin1.bounds.size.width＆lt; rubin2.frame.origin.y）{     CollisionRubies = NO;     NSLog（@“下面的碰撞”）; }

//不能发生冲突，因为Ruby1远远超过Ruby2

else if（rubin1.frame.origin.y＆lt; rubin2.frame.origin.y + rubin2.bounds.size.width）{     CollisionRubies = NO;     NSLog（@“碰撞上面”）; }

if( rubin2.frame.origin.x + rubin2.bounds.size.width < rubin1.frame.origin.x){

CollisionRubies = NO;
NSLog(@"Collision left");

}

//不能发生碰撞，因为Ruby2对Ruby1来说太过分了

else if（rubin2.frame.origin.x＆gt; rubin1.frame.origin.x + rubin1.bounds.size.width）{

CollisionRubies = NO;
NSLog(@"Collision right");

}

//不能碰撞，因为Ruby2远远低于Ruby1

else if（rubin2.frame.origin.y + rubin2.bounds.size.width＆lt; rubin1.frame.origin.y）{     CollisionRubies = NO;     NSLog（@“下面的碰撞”）; }

//不能碰撞，因为Ruby2远远高于Ruby1

else if（rubin2.frame.origin.y＆lt; rubin1.frame.origin.y + rubin1.bounds.size.width）{     CollisionRubies = NO;     NSLog（@“碰撞上面”）; }

否则{ //如果我们到了这里，那两个地方必然会发生碰撞 CollisionRubies = YES; NSLog（@“碰撞检测到”）; }

Answer 1

正如旁注，如果您使用了其他代码，如果您的代码可能会更高效，特别是如果您经常调用CollisionDetect，我认为您是。这样，如果早期的if语句之一为真，则可以忽略其余的。

Answer 2

在CollisionDetect方法中，您要在各个点设置CollisionRubies = NO，但无论刚刚发生任何测试，您都会在最后设置CollisionRubies = YES。您可能已经将方法设为一行

-(void)CollisionDetect{
  CollisionRubies = YES;
}

此外，您计算碰撞时似乎存在问题（在计算上方或下方时，宽度与y混合）

我还建议你阅读Objective-C编码风格指南。例如，对变量和方法名称使用小写的第一个字母。例如，collisionRubies和-(void)collisionDetect如果以标准方式编写，这有助于其他人更快地阅读您的代码。

Answer 3

而不是四个检查四个方向碰撞的函数，为什么不使用

if(CGRectIntersectsRect(ruby1.frame,ruby2.frame)
{
//your code
}

这个，当然，只有当你不需要知道一个物体接近另一个物体的方向时。