触摸定位CCLayer

Question

* Now* 工作代码

好的，我以为这会很容易得到工作，但结果不是我所期望的那样工作。

我试图从一个可以移动或缩放的CCLayer中获取触摸位置，而不是屏幕上的位置？我是这么想的，但它会崩溃吗？

接口#导入"cocos2d.h“

@interface TestTouch : CCLayer {
   CCLayerColor *layer;
}

+(CCScene *) scene;


@end

实现

#import "TestTouch.h"

@implementation TestTouch

+(CCScene *) scene
{
// 'scene' is an autorelease object.
CCScene *scene = [CCScene node];

// 'layer' is an autorelease object.
TestTouch *layer = [TestTouch node];

// add layer as a child to scene
[scene addChild: layer];

// return the scene
return scene;
}

- (id)init
{
    self = [super init];
    if (self) {
        CGSize winsize = [[CCDirector sharedDirector]winSize];
        CCLayerColor *layer = [CCLayerColor layerWithColor:ccc4(255, 255, 255, 255)];
//        layer.scale = 0.7f;
        layer.contentSize = CGSizeMake(640, 960);
        layer.position = CGPointMake(winsize.width/2, winsize.height/2);
        layer.isRelativeAnchorPoint = YES;
        [self addChild:layer z:0];
        [[CCTouchDispatcher sharedDispatcher] addTargetedDelegate:layer priority:0 swallowsTouches:YES];
    }

    return self;
}

- (BOOL)ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event {
    CGPoint touchStart = [[CCDirector sharedDirector] convertToGL:[touch locationInView:[touch view]]];
    touchStart = [layer convertToNodeSpace:touchStart];
    NSLog(@"Touch:%f,%f",touchStart.x, touchStart.y);

    return YES;
}

@end

如果我将这一行更改为包含"self"：

[CCTouchDispatcher sharedDispatcher addTargetedDelegate:self优先级:0燕尾触觉:是]；

它显然会工作，但然后我得到与屏幕相关的位置，而不是图层，这是我所需要的。

Answer 1

您需要将屏幕上的位置转换为该层的“节点空间”：

- (BOOL)ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event {
    CGPoint touchStart = [[CCDirector sharedDirector] convertToGL:[touch locationInView:[touch view]]];

    // convert touch location to layer space
    touchStart = [self convertToNodeSpace:touchStart];

    NSLog(@"Touch:%f,%f",touchStart.x, touchStart.y);

    return YES;
}