Touch location CCLayer - ios

Question

*Working Code Now*
OK, I thought that this would be easy to get working but it turns out to not work like I expected.
I am trying to get the Touch location from a CCLayer that can be moved or zoomed, not the location on the screen itself? here is how I thought that it would work but it crashes?
Interface
#import "cocos2d.h"
#interface TestTouch : CCLayer {
CCLayerColor *layer;
}
+(CCScene *) scene;
#end
Implementation
#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
If I change this line to include "self":
[[CCTouchDispatcher sharedDispatcher] addTargetedDelegate:self priority:0 swallowsTouches:YES];
It will obviously work but then I get the location relevant to the screen and not the layer, which is what I need.

Answer 1

You need to convert the location on the screen to the layer's "node space":
- (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;
}