Question

我有一些radiobuttons但是toucharea是小的。 toucharea取决于图像大小。有没有一种优雅的方法来扩展触摸区域与cocos2d而不使用更大的图像或使用cgrect我自己的触摸区域？ setContentSize做我想要的。不幸的是，图像移动到内容大小的左下角。设置anchorpoint会移动内容，但图像会保留在左下角。

    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

采用原始答案代码......

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)];

...你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 2

此外，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];

Answer 3

您需要覆盖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你改变的CGRect中的触摸lyes

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 4

我通过覆盖CCMenu的-(CCMenuItem*) itemForTouch:(UITouch *)touch来解决了这个问题。

-(CCMenuItem*) itemForTouch:(UITouch *)touch
{
    CGPoint touchLocation = [touch locationInView:[touch view]];
    touchLocation = [[CCDirector sharedDirector] convertToGL:touchLocation];
    CCMenuItem* item;
    CCARRAY_FOREACH(children_, item) 
    {
        if ([item visible] && [item isEnabled]) {
            CGPoint local = [item convertToNodeSpace:touchLocation];
            CGRect r = [item rect];
            r.origin = CGPointZero;
            // increase rect by * 2
            // a rect at bottom left of the image
            CGRect bigR = CGRectMake(r.origin.x - r.size.width, r.origin.y - r.size.height, r.size.width * 2, r.size.width * 2);
            // a rect at top right of the image
            CGRect bigR2 = CGRectMake(0, 0, r.size.width * 2, r.size.width * 2);
            if (CGRectContainsPoint(bigR, local) || CGRectContainsPoint(bigR2, local)) {
                return item;
            }
        }
    }
    return nil;
}

将图像中间的矩形居中放置

cocos2d从按钮扩展触摸区域

4 个答案: