cocos2d 从按钮扩展触摸区域

Question

我有一些单选按钮，但触摸区域太小。触摸区域取决于图像大小。有没有一种优雅的方法可以用 cocos2d 扩展触摸区域而不使用更大的图像或使用 cgrect 制作我自己的触摸区域？ setContentSize 做我想做的事。不幸的是，图像移动到内容大小的左下角。设置锚点移动内容大小，但图像停留在左下角。

    CCMenuItem* pickEasy = [CCMenuItemImage itemFromNormalImage:@"radiobutton_off.png" selectedImage:@"radiobutton_on.png" target:self selector:@selector(pickEasyTapped:)];
    pickEasy.position = ccp(ss.width * 0.40, ss.height * 0.78);
    [pickEasy setContentSize:CGSizeMake(50, 50)];

提前致谢。

Answer 1

你需要重写 rectInPixels 方法

- (CGRect)rectInPixels
{
CGSize s = [self contentSize];
return CGRectMake(0, 0, s.width, s.height);
}

- (BOOL)containsTouchLocation:(UITouch *)touch
{   
CGPoint p = [self convertTouchToNodeSpace:touch];
CGRect r = [self rectInPixels];
return CGRectContainsPoint(r, p);
}

- (BOOL)ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event {

NSSet *allTouches = [event allTouches];
for (UITouch *aTouch in allTouches) {

        if ( ![self containsTouchLocation:aTouch] ) return NO;
}

return YES;
}

这只是告诉精灵检查触摸是否在您更改的 CGRect 内

编辑以显示 CCSprite 子类 ---

- (void)onEnter
{
[[CCTouchDispatcher sharedDispatcher] addTargetedDelegate:self priority:0 swallowsTouches:YES];
[super onEnter];
}

- (void)onExit
{
[[CCTouchDispatcher sharedDispatcher] removeDelegate:self];
[super onExit];
}   

Answer 2

我通过从 CCMenu 覆盖 -(CCMenuItem*) itemForTouch:(UITouch *)touch 来解决问题。

-(CCMenuItem*) itemForTouch:(UITouch *)touch { CGPoint touchLocation = [touch locationInView:[touch view]]; touchLocation = [[CCDirector sharedDirector] convertToGL:touchLocation]; CCMenuItem* 项目； CCARRAY_FOREACH（儿童_，项目） { if ([item visible] && [item isEnabled]) { CGPoint local = [item convertToNodeSpace:touchLocation]; CGRect r = [项目矩形]; r.origin = CGPointZero; // 将 rect 增加 * 2 // 图片左下角的矩形 CGRect bigR = CGRectMake(r.origin.x - r.size.width, r.origin.y - r.size.height, r.size.width * 2, r.size.width * 2); // 图片右上角的矩形 CGRect bigR2 = CGRectMake(0, 0, r.size.width * 2, r.size.width * 2); if (CGRectContainsPoint(bigR, local) || CGRectContainsPoint(bigR2, local)) { 归还物品; } } } 返回零； }

将矩形居中在图像中间不起作用

Answer 3

取原来的答案码...

CCMenuItem* pickEasy = [CCMenuItemImage itemFromNormalImage:@"radiobutton_off.png" selectedImage:@"radiobutton_on.png" target:self selector:@selector(pickEasyTapped:)];
pickEasy.position = ccp(ss.width * 0.40, ss.height * 0.78);
[pickEasy setContentSize:CGSizeMake(50, 50)];

...您只需将图像设置在正确的位置...

[[[pickEasy children] objectAtIndex:0] setAnchorPoint:ccp(0.5,0.5)];
[[[pickEasy children] objectAtIndex:1] setAnchorPoint:ccp(0.5,0.5)];
[[[pickEasy children] objectAtIndex:0] setPosition:ccp(pickEasy.contentSize.width/2,pickEasy.contentSize.height/2)];
[[[pickEasy children] objectAtIndex:1] setPosition:ccp(pickEasy.contentSize.width/2,pickEasy.contentSize.height/2)];

...只有 4 行代码！玩得开心！

Answer 4

另外，您可以更改 CCMenuItem 的 activeArea 属性。 (cocos2d 2.x)

CGRect active = [someMenuItem activeArea];
[someMenuItem setActiveArea:CGRectMake(active.origin.x - active.size.width * 2.f, active.origin.y - active.size.height * 2.5f, active.size.width * 2.f, active.size.height * 2.f)];
[someMenu addChild:someMenuItem];