How do I get the world space coordinate of point that is in the center of the screen, in Cocos2d-iPhone?
Simple, just take the height and width and divide it by 2
CGSize winSize = [[CCDirector sharedDirector] winSize];
CGPoint point = ccp(winSize.width/2, winSize.height/2);
Here is a somewhat more advanced way to do it.
This will also work if you have called setPosition on the parent of the sprite (=self in this example)
CGSize winSize = [[CCDirector sharedDirector] winSize];
CCSprite* centerSprite = [CCSprite spriteWithFile:#"sprite"];
CGPoint centerPoint = ccpSub(ccp(winSize.width/2, winSize.height/2), [self position]);
[centerSprite setPosition:centerPoint];
[self addChild: centerSprite];
You can get the exact center of the screen no matter what framework you are using, Cocos or not, and also even if Cocos is not set to use the entire screen (such is the case sometimes if you crop Cocos to make room for ads) by doing something like this:
int width=[[UIScreen mainScreen] bounds].size.width
int height=[[UIScreen mainScreen] bounds].size.height
CGPoint center=ccp(width/2,height/2);
Note the ccp macro works in Cocos only; otherwise, use CGPointMake
Related
I need to take the screenshot in my cocos2d application. I've searched a lot, even in stack overflow. Then I found the following code:
+(UIImage*) screenshotWithStartNode:(CCNode*)stNode
{
[CCDirector sharedDirector].nextDeltaTimeZero = YES;
CGSize winSize = [[CCDirector sharedDirector] winSize];
CCRenderTexture* renTxture =
[CCRenderTexture renderTextureWithWidth:winSize.width
height:winSize.height];
[renTxture begin];
[stNode visit];
[renTxture end];
return [renTxture getUIImage];
}
Now,
Problem: The above code gives me the entire screenshot. But I am in need of the screenshot of a custom are, such as, within a CGRect(50,50,100,200).
Can anyone please help me..? Thanks...
Wow... found out what I need. I've changed the above method like:
-(UIImage*) screenshotWithStartNode:(CCNode*)startNode
{
[CCDirector sharedDirector].nextDeltaTimeZero = YES;
CGSize winSize = [CCDirector sharedDirector].winSize;
CCRenderTexture* rtx =
[CCRenderTexture renderTextureWithWidth:winSize.width
height:winSize.height];
[rtx begin];
[startNode visit];
[rtx end];
UIImage *tempImage = [rtx getUIImage];
CGRect imageBoundary = CGRectMake(100, 100, 300, 300);
UIGraphicsBeginImageContext(imageBoundary.size);
CGContextRef context = UIGraphicsGetCurrentContext();
// translated rectangle for drawing sub image
CGRect drawRect = CGRectMake(-imageBoundary.origin.x, -imageBoundary.origin.y, tempImage.size.width, tempImage.size.height);
// clip to the bounds of the image context
CGContextClipToRect(context, CGRectMake(0, 0, imageBoundary.size.width, imageBoundary.size.height));
// draw image
[tempImage drawInRect:drawRect];
// grab image
UIImage* subImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return subImage;
}
I have an image that loads on a MainMenu scene and appears as wrong sized when the game launches but then after finishing a level returns you to the MainMenu again the image appears right sized.
The first time the image appears to be three quarters or 4/5 of the size of the screen from left to right. The image has a white background around it so I can see a black tall rectangle in the right side of the screen on the main menu's first launch. But after a game it is sized properly and the white background image is sized properly.
Anybody ever have this happen?
Here is the init code for the MainMenuLayer:
-(id)init {
if( (self=[super initWithColor:ccc4(255,255,255,255)]) ) {
[[GameManager sharedGameManager] playBackgroundTrack:BACKGROUND_TRACK_MAIN_MENU];
CGSize screenSize = [CCDirector sharedDirector].winSize;
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
CCSprite *background = [CCSprite spriteWithFile:#"MainMenu-iPad.png"];
[background setPosition:ccp(screenSize.width/2,screenSize.height/2)];
[self addChild:background];
[self displayMainMenu];
} else {
CCSprite *background = [CCSprite spriteWithFile:#"MainMenu.png"];
[background setPosition:ccp(screenSize.width/2,screenSize.height/2)];
[self addChild:background];
[self displayMainMenu];
}
-
It works fine on the simulator though...
Print screen position, if position is wrong then put you code in onEnter instead of init.
See this thread in Stack overflow.
-(id)init {
if( (self=[super initWithColor:ccc4(255,255,255,255)]) ) {
}
return self;
}
-(void)onEnter {
[super onEnter];
[[GameManager sharedGameManager] playBackgroundTrack:BACKGROUND_TRACK_MAIN_MENU];
CGSize screenSize = [CCDirector sharedDirector].winSize;
CCSprite *background = [CCSprite spriteWithFile:#"MainMenu.png"];
[background setPosition:ccp(screenSize.width/2,screenSize.height/2)];
[self addChild:background];
[self displayMainMenu];
}
The image was apparently being cached even after clean and build! I ended up replacing the image by removing the original and adding the same one but with some markers just to make sure it got replaced.
Did they changed the positioning method in this cocos2d version 2 ?
i do this :
mainBack=[CCSprite spriteWithFile:#"plus.png"];
mainBack.position=ccp(winSize.width/2,winSize.height/2);
NSLog(#"THE PLACE IS IN:%#",NSStringFromCGPoint(mainBack.position) );
[self addChild:mainBack z:0];
its not in the middle but next to it.
it does prints 160, 240.
i am in a retina display when the image is twice bigger .
why is it not in the middle of the screen ?
thanks.
i think u r doing this in ur init method of first scene. Try same thing in onEnter method..everything works fine.
-(void)onEnter
{
[super onEnter];
CGSize winSize = [CCDirector sharedDirector].winSize;
mainBack=[CCSprite spriteWithFile:#"plus.png"];
mainBack.anchorPoint = ccp(0.5f,0.5f);
mainBack.position=ccp(winSize.width/2,winSize.height/2);
NSLog(#"THE PLACE IS IN:%#",NSStringFromCGPoint(mainBack.position) );
[self addChild:mainBack z:0];
}
I'm trying to load one scene. This runs fine the first time, but when I try to reload again appears a white square where the animation is placed.
This is the code to start and stop the scene. What I'm missing?
thanks.
-(void)runScene:(OTAnimationCC2d *)animation
{
scene = [CCScene node];
[scene addChild:animation];
if ([[[CCDirector sharedDirector] runningScene] isRunning])
{
[[CCDirector sharedDirector] replaceScene:scene];
}
else
{
[[CCDirector sharedDirector] runWithScene:scene];
}
}
-(void)stopScene
{
[[[CCDirector sharedDirector] runningScene] stopAllActions];
[[[CCDirector sharedDirector] runningScene] removeAllChildrenWithCleanup:YES];
[[CCDirector sharedDirector] pushScene:scene];
}
Why not just call [self runScene] at the end of stopScene rather than [[CCDirector sharedDirector] pushScene:scene]? It sounds like you want the scene to reload fresh, which your runScene already does when it calls replaceScene.
Either way you should be creating a new scene node and using replaceScene (which is being done in runScene and is why I recommend just calling that).
I really assistance. Im a little confused.
i have a circle sprite, and this code
-(void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
CGSize winSize =[[CCDirector sharedDirector] winSize];
UITouch* myTouch = [touches anyObject];
CGPoint location = [myTouch locationInView: [myTouch view]];
location = [[CCDirector sharedDirector]convertToGL:location];
CCSprite *circleSprite = (CCSprite*)[self getChildByTag:30];
CGRect correctColorSprite1 = [circleSprite boundingBox];
if (CGRectContainsPoint(correctColorSprite1, location)) {
NSLog(#"inside");
}
as i know there is a bounding box, when i touch slightly outside of the top circle it will still detect the touch.
i have read in some forums that i need to detect distance of the centre of the sprite and the touch point. But i really don't know how to write that code. My circle size is around 50 points.
I hope someone can help me out give me some snippets of a improved code to detect the touch only in the circle. Not with the bounding box. Your help is very great full.
Try this:
-(void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
CGSize winSize =[[CCDirector sharedDirector] winSize];
UITouch* myTouch = [touches anyObject];
CGPoint location = [myTouch locationInView: [myTouch view]];
location = [[CCDirector sharedDirector]convertToGL:location];
CCSprite *circleSprite = (CCSprite*)[self getChildByTag:30];
//CGRect correctColorSprite1 = [circleSprite boundingBox];
CGRect correctColorSprite1 = CGRectMake(
circleSprite.position.x - (circleSprite.contentSize.width/2),
circleSprite.position.y - (circleSprite.contentSize.height/2),
circleSprite.contentSize.width,
circleSprite.contentSize.height);
//find the center of the bounding box
CGPoint center=ccp(correctColorSprite1.size.width/2,correctColorSprite1.size.height/2);
//now test against the distance of the touchpoint from the center
if (ccpDistance(center, location)<50)
{
NSLog(#"inside");
}
}