多点触摸检测和差异化 - Cocos2d for iPhone
我想知道如何在多点触摸视图中检测和区分触摸。我读过有关“哈希”代码的内容，但我不明白如何使用它。我想知道我的两个精灵何时被同时触摸，就像在钢琴的两个琴键上按下和弦一样。
[编辑] 以下是我的 ccTouchesBegan: 的示例：
- (void) ccTouchesBegan:(NSSet*)touches withEvent:(UIEvent*)event {
NSSet *allTouches = [event allTouches];
int validTouchCount = 0;
for (UITouch* touch in allTouches) {
BOOL touchIsValid = FALSE;
CGPoint location = [touch locationInView: [touch view]];
CGPoint convertedLocation = [[CCDirector sharedDirector] convertToGL:location];
if (CGRectContainsPoint(_fourButtonsRect, convertedLocation)) {
NSLog(@"Touch is within four buttons");
touchIsValid = TRUE;
}
_playerDidAction = 0;
NSLog(@"before the loop");
if (touchIsValid) {
validTouchCount++;
NSLog(@"Within ValidTouches loop");
CGPoint validLocation = [touch locationInView: [touch view]];
CGPoint convertedValidLocation = [[CCDirector sharedDirector] convertToGL:validLocation];
if (CGRectContainsPoint(_redButtonSprite.boundingBox, convertedValidLocation)) {
_redButtonStatus = TRUE;
[_redButtonSprite setTexture:_redButtonLit];
if (validTouchCount == 1) {
_playerDidAction = 1;
}
}
else if (CGRectContainsPoint(_blueButtonSprite.boundingBox, convertedValidLocation)) {
_blueButtonStatus = TRUE;
[_blueButtonSprite setTexture:_blueButtonLit];
if (validTouchCount == 1) {
_playerDidAction = 2;
}
}
else if (CGRectContainsPoint(_greenButtonSprite.boundingBox, convertedValidLocation)) {
_greenButtonStatus = TRUE;
[_greenButtonSprite setTexture:_greenButtonLit];
if (validTouchCount == 1) {
_playerDidAction = 3;
}
}
else if (CGRectContainsPoint(_yellowButtonSprite.boundingBox, convertedValidLocation)) {
_yellowButtonStatus = TRUE;
[_yellowButtonSprite setTexture:_yellowButtonLit];
if (validTouchCount == 1) {
_playerDidAction = 4;
}
}
if (validTouchCount > 1) {
if (_redButtonStatus && _blueButtonStatus) {
_comboRB = TRUE;
_playerDidAction = 5;
}
else if (_redButtonStatus && _greenButtonStatus) {
_comboRG = TRUE;
_playerDidAction = 6;
}
else if (_redButtonStatus && _yellowButtonStatus) {
_comboRY = TRUE;
_playerDidAction = 7;
}
else if (_blueButtonStatus && _greenButtonStatus) {
_comboBG = TRUE;
_playerDidAction = 8;
}
else if (_blueButtonStatus && _yellowButtonStatus) {
_comboBY = TRUE;
_playerDidAction = 9;
}
else if (_greenButtonStatus && _yellowButtonStatus) {
_comboGY = TRUE;
_playerDidAction = 10;
}
}
}
}
}
这是我的 ccTouchesEnded: 的开头：
- (void)ccTouchesEnded:(NSSet*)touches withEvent:(UIEvent*)event {
for (UITouch *touch in touches) {
CGPoint location = [touch locationInView: [touch view]];
CGPoint convertedLocation = [[CCDirector sharedDirector] convertToGL:location];
if (CGRectContainsPoint(_redButtonSprite.boundingBox, convertedLocation)) {
_redButtonStatus = FALSE;
[_redButtonSprite setTexture:_redButtonNormal];
}
if (CGRectContainsPoint(_blueButtonSprite.boundingBox, convertedLocation)) {
_blueButtonStatus = FALSE;
[_blueButtonSprite setTexture:_blueButtonNormal];
}
if (CGRectContainsPoint(_greenButtonSprite.boundingBox, convertedLocation)) {
_greenButtonStatus = FALSE;
[_greenButtonSprite setTexture:_greenButtonNormal];
}
if (CGRectContainsPoint(_yellowButtonSprite.boundingBox, convertedLocation)) {
_yellowButtonStatus = FALSE;
[_yellowButtonSprite setTexture:_yellowButtonNormal];
}
}
}
您能否给我一个示例，说明如何捕获在精灵上开始并在精灵上结束的触摸？我一直在努力，无法让哈希代码工作 - 只是不明白如何使用哈希代码来引用稍后的触摸。我想我想做的东西会被称为哈希跟踪器？
我确信有一种更简单的方法可以使用哈希码和更少的状态变量来完成此操作。我没有用其他状态变量效果来充实 ccTouchesEnded 方法，因为我希望找到一种更简单的方法（我知道我仍然需要制作 ccTouchesMoved 和 Canceled 方法）。
I would like to know how to detect and differentiate between touches in a multi-touch view. I have read about a "hash" code, but I don't understand how to use it. I want to know when two of my Sprites are touched at the same time, like as if pressing a chord on two keys of a piano.
[EDIT]
Here is an example of what I have for my ccTouchesBegan:
- (void) ccTouchesBegan:(NSSet*)touches withEvent:(UIEvent*)event {
NSSet *allTouches = [event allTouches];
int validTouchCount = 0;
for (UITouch* touch in allTouches) {
BOOL touchIsValid = FALSE;
CGPoint location = [touch locationInView: [touch view]];
CGPoint convertedLocation = [[CCDirector sharedDirector] convertToGL:location];
if (CGRectContainsPoint(_fourButtonsRect, convertedLocation)) {
NSLog(@"Touch is within four buttons");
touchIsValid = TRUE;
}
_playerDidAction = 0;
NSLog(@"before the loop");
if (touchIsValid) {
validTouchCount++;
NSLog(@"Within ValidTouches loop");
CGPoint validLocation = [touch locationInView: [touch view]];
CGPoint convertedValidLocation = [[CCDirector sharedDirector] convertToGL:validLocation];
if (CGRectContainsPoint(_redButtonSprite.boundingBox, convertedValidLocation)) {
_redButtonStatus = TRUE;
[_redButtonSprite setTexture:_redButtonLit];
if (validTouchCount == 1) {
_playerDidAction = 1;
}
}
else if (CGRectContainsPoint(_blueButtonSprite.boundingBox, convertedValidLocation)) {
_blueButtonStatus = TRUE;
[_blueButtonSprite setTexture:_blueButtonLit];
if (validTouchCount == 1) {
_playerDidAction = 2;
}
}
else if (CGRectContainsPoint(_greenButtonSprite.boundingBox, convertedValidLocation)) {
_greenButtonStatus = TRUE;
[_greenButtonSprite setTexture:_greenButtonLit];
if (validTouchCount == 1) {
_playerDidAction = 3;
}
}
else if (CGRectContainsPoint(_yellowButtonSprite.boundingBox, convertedValidLocation)) {
_yellowButtonStatus = TRUE;
[_yellowButtonSprite setTexture:_yellowButtonLit];
if (validTouchCount == 1) {
_playerDidAction = 4;
}
}
if (validTouchCount > 1) {
if (_redButtonStatus && _blueButtonStatus) {
_comboRB = TRUE;
_playerDidAction = 5;
}
else if (_redButtonStatus && _greenButtonStatus) {
_comboRG = TRUE;
_playerDidAction = 6;
}
else if (_redButtonStatus && _yellowButtonStatus) {
_comboRY = TRUE;
_playerDidAction = 7;
}
else if (_blueButtonStatus && _greenButtonStatus) {
_comboBG = TRUE;
_playerDidAction = 8;
}
else if (_blueButtonStatus && _yellowButtonStatus) {
_comboBY = TRUE;
_playerDidAction = 9;
}
else if (_greenButtonStatus && _yellowButtonStatus) {
_comboGY = TRUE;
_playerDidAction = 10;
}
}
}
}
}
And here is the beginning of my ccTouchesEnded:
- (void)ccTouchesEnded:(NSSet*)touches withEvent:(UIEvent*)event {
for (UITouch *touch in touches) {
CGPoint location = [touch locationInView: [touch view]];
CGPoint convertedLocation = [[CCDirector sharedDirector] convertToGL:location];
if (CGRectContainsPoint(_redButtonSprite.boundingBox, convertedLocation)) {
_redButtonStatus = FALSE;
[_redButtonSprite setTexture:_redButtonNormal];
}
if (CGRectContainsPoint(_blueButtonSprite.boundingBox, convertedLocation)) {
_blueButtonStatus = FALSE;
[_blueButtonSprite setTexture:_blueButtonNormal];
}
if (CGRectContainsPoint(_greenButtonSprite.boundingBox, convertedLocation)) {
_greenButtonStatus = FALSE;
[_greenButtonSprite setTexture:_greenButtonNormal];
}
if (CGRectContainsPoint(_yellowButtonSprite.boundingBox, convertedLocation)) {
_yellowButtonStatus = FALSE;
[_yellowButtonSprite setTexture:_yellowButtonNormal];
}
}
}
Could you maybe give me an example of how you would capture touches that began on a sprite and ended on a sprite? I have been struggling and can't get the hash code to work - just not understanding how the hash code can be used to reference a touch later. I guess what I'm trying to make would be called a hash tracker?
I am sure there is a much less convoluted way to do it using the hash codes and less state variables. I haven't fleshed out the ccTouchesEnded method with the other state variable effects because I was hoping to find a simpler way (I know I still need to make the ccTouchesMoved and Canceled methods too).
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假设您有两次触摸。您会获得两个触地事件，例如在 (1,1) 和 (2,2) 处。假设用户使用两侧手指，然后您会收到另一个事件，但这次可能在 (3,3) 和 (4,4) 处。
问题是，（1,1）移动到（3,3）并且（2,2）移动到（4,4） - 或者相反的情况发生 - （1,1）移动到（4,4） (2,2) 移至 (3,3)。
这就是“哈希代码”的用途 - 为每个触摸赋予一个“名称” - 这样您就可以知道在为该触摸生成后续事件时特定触摸会发生什么。
因此，对于您的情况，您将获得触摸事件 - 查看坐标并确定每个按键按下的键。然后，您可以跟踪每次触摸的哈希，以确定它们的触摸（即特定钢琴键）何时被释放。
您不能为此使用坐标，因为随着手指滑动，坐标可能改变。
Suppose you have two touches. You get a touch down event for the two, say at (1,1) and (2,2). Let's say the user the sides both fingers, you then get another event, but this time maybe at (3,3) and (4,4).
The question is, did (1,1) move to (3,3) and (2,2) move to (4,4) - or did the opposite happen - where (1,1) moved to (4,4) and (2,2) moved to (3,3).
This is what the "Hash Code" is used for - to give each touch a "name" - so you can tell what happens to that particular touch as subsequent events are generated for it.
So for your case, you would get the touch events - look at the coordinates and determine which key is pressed for each. You then keep track of the hash for each touch, to determine when they touch (i.e. the particular piano key) is released.
You can't use the coordinates for this, because to coordinates can change as fingers are slid.
以下是我如何实现这一点，以防其他人尝试这样做（我将其限制为 2 按钮组合，但我也可以轻松地将逻辑扩展到 3 和 4 按钮组合）。我选择使用 ccTouchBegan/Ended/Moved 单独处理每个触摸，而不是使用 ccTouchesBegan/Ended/Moved，因为我无法让它与哈希代码一起使用。任何替代想法都将受到欢迎。
spuButton.h（CCSprite 子类）
spuButton.m
HelloWorldScene.m（只是我的勾选：防止其他函数混淆示例的方法）
Here is how I implemented this in case anyone else is trying to do this (I have limited it to 2-button combos but I could easily extend the logic to 3 & 4-button combos as well). I chose to handle each touch individually using the ccTouchBegan/Ended/Moved instead of using the ccTouchesBegan/Ended/Moved because I just couldn't get it to work with the hash code. Any alternative ideas would be welcome.
spuButton.h (a CCSprite Subclass)
spuButton.m
HelloWorldScene.m (Just my tick: method to keep my other functions from confusing the example)