iphone - 多点触控检测和区分 - Cocos2d for iPhone

Question

我想知道如何在多点触控视图中检测和区分触摸。我已经阅读了“哈希”代码，但我不明白如何使用它。我想知道我的两个精灵何时同时被触摸，就像在钢琴的两个琴键上按下和弦一样。

[编辑] 这是我的 ccTouchesBegan 的一个示例：

- (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];
        }


    }
}

你能不能给我一个例子，说明你如何捕捉从精灵开始到精灵结束的触摸？我一直在苦苦挣扎，无法让哈希码工作 - 只是不明白如何使用哈希码来引用稍后的触摸。我想我正在尝试做的将被称为哈希跟踪器？

我确信使用哈希码和更少的状态变量可以使用一种不那么复杂的方法。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）。

Answer 1

假设你有两个触摸。您会在 (1,1) 和 (2,2) 处获得两者的触地得分事件。比方说用户的两个手指，然后你会得到另一个事件，但这次可能在 (3,3) 和 (4,4)。

问题是，（1,1）移动到（3,3）和（2,2）移动到（4,4） - 或者相反的情况发生了 - 其中（1,1）移动到（4,4） (2,2) 移至 (3,3)。

这就是“哈希码”的用途——给每个触摸一个“名称”——这样你就可以知道在为它生成后续事件时该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下哪个键。然后，您跟踪每次触摸的哈希值，以确定它们何时触摸（即特定的钢琴键）被释放。

您不能为此使用坐标，因为坐标会随着手指的滑动而改变。

Answer 2

这是我如何实现它以防其他人尝试执行此操作（我已将其限制为 2 键组合，但我也可以轻松地将逻辑扩展到 3 和 4 键组合）。我选择使用 ccTouchBegan/Ended/Moved 而不是使用 ccTouchesBegan/Ended/Moved 单独处理每个触摸，因为我无法让它与哈希码一起使用。欢迎任何替代想法。

spuButton.h（CCSprite 子类）

#import <Foundation/Foundation.h>
#import "cocos2d.h"

typedef enum tagButtonState {
    kButtonStatePressed,
    kButtonStateNotPressed
} ButtonState;

typedef enum tagButtonStatus {
    kButtonStatusEnabled,
    kButtonStatusDisabled
} ButtonStatus;

@interface spuButton : CCSprite <CCTargetedTouchDelegate> {
@private
    ButtonState buttonState;
    CCTexture2D *buttonNormal;
    CCTexture2D *buttonLit;
    ButtonStatus buttonStatus;  
}

@property(nonatomic, readonly) CGRect rect;

+ (id)spuButtonWithTexture:(CCTexture2D *)normalTexture;

- (void)setNormalTexture:(CCTexture2D *)normalTexture;
- (void)setLitTexture:(CCTexture2D *)litTexture;
- (BOOL)isPressed;
- (BOOL)isNotPressed;
- (void)makeDisabled;
- (void)makeEnabled;
- (BOOL)isEnabled;
- (BOOL)isDisabled;
- (void)makeLit;
- (void)makeNormal;
- (void)dealloc;

@end

spuButton.m

#import "spuButton.h"
#import "cocos2d.h"

@implementation spuButton

- (CGRect)rect {
    CGSize s = [self.texture contentSize];
    return CGRectMake(-s.width / 2, -s.height / 2, s.width, s.height);
}

+ (id)spuButtonWithTexture:(CCTexture2D *)normalTexture {
    return [[[self alloc] initWithTexture:normalTexture] autorelease];
}

- (void)setNormalTexture:(CCTexture2D *)normalTexture {
    buttonNormal = normalTexture;
}
- (void)setLitTexture:(CCTexture2D *)litTexture {
    buttonLit = litTexture;
}

- (BOOL)isPressed {
    if (buttonState== kButtonStateNotPressed) return NO;
    if (buttonState== kButtonStatePressed) return YES;
    return NO;
}

- (BOOL)isNotPressed {
    if (buttonState== kButtonStateNotPressed) return YES;
    if (buttonState== kButtonStatePressed) return NO;
    return YES;
}

- (void)makeDisabled {
    buttonStatus = kButtonStatusDisabled;
    buttonState= kButtonStateNotPressed;
    [self makeNormal];
}
- (void)makeEnabled {
    buttonStatus = kButtonStatusEnabled;
    buttonState= kButtonStateNotPressed;
    [self makeNormal];
}

- (BOOL)isEnabled {
    if (buttonStatus== kButtonStatusDisabled) return NO;
    if (buttonStatus== kButtonStatusEnabled) return YES;
    return NO;
}

- (BOOL)isDisabled {
    if (buttonStatus== kButtonStatusEnabled) return NO;
    if (buttonStatus== kButtonStatusDisabled) return YES;
    return YES;
}

- (void)makeLit {
    [self setTexture:buttonLit];
}

- (void)makeNormal {
    [self setTexture:buttonNormal];
}

- (id)initWithTexture:(CCTexture2D *)aTexture {
    if ((self = [super initWithTexture:aTexture]) ) {       
        buttonState = kButtonStateNotPressed;
        buttonStatus = kButtonStatusEnabled;
    }
    return self;
}

- (void)onEnter {
    if (buttonStatus == kButtonStatusDisabled) return;
    [[CCTouchDispatcher sharedDispatcher] addTargetedDelegate:self priority:0 swallowsTouches:NO];
    [super onEnter];
}

- (void)onExit {
    if (buttonStatus == kButtonStatusDisabled) return;
    [[CCTouchDispatcher sharedDispatcher] removeDelegate:self];
    [super onExit];
}   

- (BOOL)containsTouchLocation:(UITouch *)touch {
    return CGRectContainsPoint(self.rect, [self convertTouchToNodeSpaceAR:touch]);
}

- (BOOL)ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event {
    if (buttonStatus == kButtonStatusDisabled) return NO;
    if (buttonState== kButtonStatePressed) return NO;
    if ( ![self containsTouchLocation:touch] ) return NO;

    buttonState= kButtonStatePressed;
    [self makeLit];

    return YES;
}

- (void)ccTouchMoved:(UITouch *)touch withEvent:(UIEvent *)event {
    // If it weren't for the TouchDispatcher, you would need to keep a reference
    // to the touch from touchBegan and check that the current touch is the same
    // as that one.
    // Actually, it would be even more complicated since in the Cocos dispatcher
    // you get NSSets instead of 1 UITouch, so you'd need to loop through the set
    // in each touchXXX method.

    if (buttonStatus == kButtonStatusDisabled) return;
    if ([self containsTouchLocation:touch]) return;

    buttonState= kButtonStateNotPressed;
    [self makeNormal];
}

- (void)ccTouchEnded:(UITouch *)touch withEvent:(UIEvent *)event {
    if (buttonStatus == kButtonStatusDisabled) return;

    buttonState= kButtonStateNotPressed;
    [self makeNormal];
}

- (void)dealloc {
    [buttonNormal release];
    [buttonLit release];
    [super dealloc];
}

@end

HelloWorldScene.m（只是我的记号：防止我的其他函数混淆示例的方法）

-(void)tick:(ccTime)dt {
    if ([[_otherControlsArray objectAtIndex:0] wasPressed]) {
        [[_otherControlsArray objectAtIndex:0] setWasPressed:NO];
        [self removeChild:[_otherControlsArray objectAtIndex:0] cleanup:YES];
        [self addChild:[_otherControlsArray objectAtIndex:1]];
        NSLog(@"Play");

        _gameHasNotBeenPlayedYet = NO;
        Snarfle_s_PowerUPAppDelegate *delegate = [[UIApplication sharedApplication] delegate];
        [delegate makeNotPaused];
        [self gameLogic];
    }

    if (_gameHasNotBeenPlayedYet) {
        return;
    }

    if (_buttonsPressedAndReleased > 0) {  //respond to button(s) released and reset
        NSLog(@"Buttons Pressed and Released-->%d",_buttonsPressedAndReleased);
        if ([self checkButtons:_buttonsPressedAndReleased]);
        _buttonsPressed = 0;
        _buttonsPressedAndReleased = 0;

        return;
    }
    if (_buttonsPressed <= 4) { // two buttons have not already been pressed
        for (spuButton *aButton in _fourButtonsArray) {
            if ([aButton isNotPressed]) continue; //this button is not pressed
            if (_buttonsPressed == 0) { //this button is pressed and no other buttons have been pressed
                _buttonsPressed = aButton.tag;
                continue;
            }
            //this button is pressed while another has been pressed
            //figure out which two buttons have been pressed
            if (_buttonsPressed == 1) {  //red plus another
                switch (aButton.tag) {
                    case 2:   //blue
                        _buttonsPressed = 5;
                        [[_fourButtonsArray objectAtIndex:2] makeDisabled];
                        [[_fourButtonsArray objectAtIndex:3] makeDisabled];
                        break;
                    case 3:  //green
                        _buttonsPressed = 6;
                        [[_fourButtonsArray objectAtIndex:1] makeDisabled];
                        [[_fourButtonsArray objectAtIndex:3] makeDisabled];
                        break;
                    case 4:  //yellow
                        _buttonsPressed = 7;
                        [[_fourButtonsArray objectAtIndex:1] makeDisabled];
                        [[_fourButtonsArray objectAtIndex:2] makeDisabled];
                        break;
                    default:
                        _buttonsPressed = 1;
                        break;
                }
            }
            if (_buttonsPressed == 2) {  //blue plus another
                switch (aButton.tag) {
                    case 1:   //red
                        _buttonsPressed = 5;
                        [[_fourButtonsArray objectAtIndex:2] makeDisabled];
                        [[_fourButtonsArray objectAtIndex:3] makeDisabled];
                        break;
                    case 3:  //green
                        _buttonsPressed = 8;
                        [[_fourButtonsArray objectAtIndex:0] makeDisabled];
                        [[_fourButtonsArray objectAtIndex:3] makeDisabled];
                        break;
                    case 4:  //yellow
                        _buttonsPressed = 9;
                        [[_fourButtonsArray objectAtIndex:0] makeDisabled];
                        [[_fourButtonsArray objectAtIndex:2] makeDisabled];
                        break;
                    default:
                        _buttonsPressed = 2;
                        break;
                }
            }
            if (_buttonsPressed == 3) {  //green plus another
                switch (aButton.tag) {
                    case 1:   //red
                        _buttonsPressed = 6;
                        [[_fourButtonsArray objectAtIndex:1] makeDisabled];
                        [[_fourButtonsArray objectAtIndex:3] makeDisabled];
                        break;
                    case 2:  //blue
                        _buttonsPressed = 8;
                        [[_fourButtonsArray objectAtIndex:0] makeDisabled];
                        [[_fourButtonsArray objectAtIndex:3] makeDisabled];
                        break;
                    case 4:  //yellow
                        _buttonsPressed = 10;
                        [[_fourButtonsArray objectAtIndex:0] makeDisabled];
                        [[_fourButtonsArray objectAtIndex:1] makeDisabled];
                        break;
                    default:
                        _buttonsPressed = 3;
                        break;
                }
            }
            if (_buttonsPressed == 4) {  //yellow plus another
                switch (aButton.tag) {
                    case 1:   //red
                        _buttonsPressed = 7;
                        [[_fourButtonsArray objectAtIndex:1] makeDisabled];
                        [[_fourButtonsArray objectAtIndex:2] makeDisabled];
                        break;
                    case 2:  //blue
                        _buttonsPressed = 9;
                        [[_fourButtonsArray objectAtIndex:0] makeDisabled];
                        [[_fourButtonsArray objectAtIndex:2] makeDisabled];
                        break;
                    case 3:  //green
                        _buttonsPressed = 10;
                        [[_fourButtonsArray objectAtIndex:0] makeDisabled];
                        [[_fourButtonsArray objectAtIndex:1] makeDisabled];
                        break;
                    default:
                        _buttonsPressed = 4;
                        break;
                }
            }
            if (_buttonsPressed > 4) break;  //more than one has been pressed and identified
        }
    }
    //now we know what buttons have been pressed now check to see if they have been released
    //if more than one has been pressed disable the other two
    //also if more than one has been pressed and one of them gets released disable the released one but keep it lit
    switch (_buttonsPressed) {
        case 1:  //red
            if ([[_fourButtonsArray objectAtIndex:0] isNotPressed]) _buttonsPressedAndReleased = 1;
            break;
        case 2:  //blue
            if ([[_fourButtonsArray objectAtIndex:1] isNotPressed]) _buttonsPressedAndReleased = 2;
            break;
        case 3:  //green
            if ([[_fourButtonsArray objectAtIndex:2] isNotPressed]) _buttonsPressedAndReleased = 3;
            break;
        case 4:  //yellow
            if ([[_fourButtonsArray objectAtIndex:3] isNotPressed]) _buttonsPressedAndReleased = 4;
            break;
        case 5:  //red & blue
            if (([[_fourButtonsArray objectAtIndex:0] isNotPressed]) && ([[_fourButtonsArray objectAtIndex:1] isNotPressed])) _buttonsPressedAndReleased = 5;
            else {
                if ([[_fourButtonsArray objectAtIndex:0] isNotPressed]) {
                    [[_fourButtonsArray objectAtIndex:0] makeDisabled];
                    [[_fourButtonsArray objectAtIndex:0] makeLit];
                }
                if ([[_fourButtonsArray objectAtIndex:1] isNotPressed]) {
                    [[_fourButtonsArray objectAtIndex:1] makeDisabled];
                    [[_fourButtonsArray objectAtIndex:1] makeLit];
                }
            }
            break;
        case 6:  //red & green
            if (([[_fourButtonsArray objectAtIndex:0] isNotPressed]) && ([[_fourButtonsArray objectAtIndex:2] isNotPressed])) _buttonsPressedAndReleased = 6;
            else {
                if ([[_fourButtonsArray objectAtIndex:0] isNotPressed]) {
                    [[_fourButtonsArray objectAtIndex:0] makeDisabled];
                    [[_fourButtonsArray objectAtIndex:0] makeLit];
                }
                if ([[_fourButtonsArray objectAtIndex:2] isNotPressed]) {
                    [[_fourButtonsArray objectAtIndex:2] makeDisabled];
                    [[_fourButtonsArray objectAtIndex:2] makeLit];
                }
            }
            break;
        case 7:  //red & yellow
            if (([[_fourButtonsArray objectAtIndex:0] isNotPressed]) && ([[_fourButtonsArray objectAtIndex:3] isNotPressed])) _buttonsPressedAndReleased = 7;
            else {
                if ([[_fourButtonsArray objectAtIndex:0] isNotPressed]) {
                    [[_fourButtonsArray objectAtIndex:0] makeDisabled];
                    [[_fourButtonsArray objectAtIndex:0] makeLit];
                }
                if ([[_fourButtonsArray objectAtIndex:3] isNotPressed]) {
                    [[_fourButtonsArray objectAtIndex:3] makeDisabled];
                    [[_fourButtonsArray objectAtIndex:3] makeLit];
                }
            }
            break;
        case 8:  //blue & green
            if (([[_fourButtonsArray objectAtIndex:1] isNotPressed]) && ([[_fourButtonsArray objectAtIndex:2] isNotPressed])) _buttonsPressedAndReleased = 8;
            else {
                if ([[_fourButtonsArray objectAtIndex:1] isNotPressed]) {
                    [[_fourButtonsArray objectAtIndex:1] makeDisabled];
                    [[_fourButtonsArray objectAtIndex:1] makeLit];
                }
                if ([[_fourButtonsArray objectAtIndex:2] isNotPressed]) {
                    [[_fourButtonsArray objectAtIndex:2] makeDisabled];
                    [[_fourButtonsArray objectAtIndex:2] makeLit];
                }
            }
            break;
        case 9:  //blue & yellow
            if (([[_fourButtonsArray objectAtIndex:1] isNotPressed]) && ([[_fourButtonsArray objectAtIndex:3] isNotPressed])) _buttonsPressedAndReleased = 9;
            else {
                if ([[_fourButtonsArray objectAtIndex:1] isNotPressed]) {
                    [[_fourButtonsArray objectAtIndex:1] makeDisabled];
                    [[_fourButtonsArray objectAtIndex:1] makeLit];
                }
                if ([[_fourButtonsArray objectAtIndex:3] isNotPressed]) {
                    [[_fourButtonsArray objectAtIndex:3] makeDisabled];
                    [[_fourButtonsArray objectAtIndex:3] makeLit];
                }
            }
            break;
        case 10:  //green & yellow
            if (([[_fourButtonsArray objectAtIndex:2] isNotPressed]) && ([[_fourButtonsArray objectAtIndex:3] isNotPressed])) _buttonsPressedAndReleased = 10;
            else {
                if ([[_fourButtonsArray objectAtIndex:2] isNotPressed]) {
                    [[_fourButtonsArray objectAtIndex:2] makeDisabled];
                    [[_fourButtonsArray objectAtIndex:2] makeLit];
                }
                if ([[_fourButtonsArray objectAtIndex:3] isNotPressed]) {
                    [[_fourButtonsArray objectAtIndex:3] makeDisabled];
                    [[_fourButtonsArray objectAtIndex:3] makeLit];
                }
            }
            break;
        default:
            _buttonsPressedAndReleased = 0;
            break;
    }
}