I'm very headache about this problem, I'm using these code for capturing a part of the screen
-(UIImage *) glToUIImage {
userphotoCount++;
[CCDirector sharedDirector].nextDeltaTimeZero = YES;
CGSize winSize = [CCDirector sharedDirector].winSize;
CCLayerColor* whitePage = [CCLayerColor layerWithColor:ccc4(255, 255, 255, 0) width:winSize.width height:winSize.height];
whitePage.position = ccp(winSize.width/2, winSize.height/2);
CCRenderTexture* rtx = [CCRenderTexture renderTextureWithWidth:815 height:532];
[rtx begin];
[whitePage visit];
[[[CCDirector sharedDirector] runningScene] visit];
[rtx end];
return [rtx getUIImageFromBuffer];
}
I can get my UIImage by
image = [self glToUIImage];
Then I try to use this code to generate a sprite by the UIImage
-(void) ImageSprite{
image = [self glToUIImage];
userAns = [CCSprite spriteWithCGImage:image.CGImage key:[NSString stringWithFormat:#"photoCap%d.png", userphotoCount]];
userAns.position=ccp(780,410);
userAns.scale=0.6;
[self addChild:userAns z:20];
}
I can get image by these code at first time, but after I changed the screen's contents and use these code to generate new sprite(new UIImage) with the new contents, I'm failed.... the image doesn't change to new image...
How can I get the new image sprite when every time I run the "imageSprite" code?
You can get the new image sprite, but you must to change key
[CCSprite spriteWithCGImage:image.CGImage key:key];
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.
As the title, I have mentioned the code below
CCSprite *sprite = (CCSprite *)node;
CCTexture2D *texture2d = [sprite texture];
How can I get a UIImage *p from sprite?
In your case just add next methood into your class:
- (UIImage *) imageFromSprite :(CCSprite *)sprite
{
int tx = sprite.contentSize.width;
int ty = sprite.contentSize.height;
CCRenderTexture *renderer = [CCRenderTexture renderTextureWithWidth:tx height:ty];
sprite.anchorPoint = CGPointZero;
[renderer begin];
[sprite visit];
[renderer end];
return [renderer getUIImage];
}
how to use:
CCSprite *sprite = (CCSprite *)node;
UIImage *p = [self imageFromSprite:sprite]
uhh...
I think this is a better to way. Add this as a category on CCNode.
-(UIImage*)image {
CCRenderTexture* renderer = [CCRenderTexture renderTextureWithWidth:self.contentSize.width height:self.contentSize.height];
const CGPoint ANCHORBEFORE = self.anchorPoint;
self.anchorPoint = CGPointZero;
[renderer begin];
[self visit];
[renderer end];
self.anchorPoint = ANCHORBEFORE;
return [renderer getUIImage];
}
If you are using cocos2d 2.x, render sprite into CCRenderTexture and call getUIImage method of that render texture.
By looking at the source code of both CCSprite and CCTexture2D you can see that the image is used only for creating the texture data and the image object is not kept but temporarily used.
CCTexture2D source :
http://code.google.com/p/cocos2d-iphone/source/browse/trunk/cocos2d/CCTexture2D.m?r=1882
CCSprite source :
http://code.google.com/p/cocos2d-iphone/source/browse/trunk/cocos2d/CCSprite.m?r=1747
Look in the init methods that use CGImageRef
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 have an app where I have several layers created from PNG images with transparency. These layers are all on the screen over each other. I need to be able to ignore touches given to transparent areas of layers and just be able to detect as touches, when the user taps on a non-transparent area of a layer... see pic...
How do I do that? thanks.
Here you have a possible solution.
Implement an extension on CCLayer and provide this method:
- (BOOL)isPixelTransparentAtLocation:(CGPoint)loc
{
//Convert the location to the node space
CGPoint location = [self convertToNodeSpace:loc];
//This is the pixel we will read and test
UInt8 pixel[4];
//Prepare a render texture to draw the receiver on, so you are able to read the required pixel and test it
CGSize screenSize = [[CCDirector sharedDirector] winSize];
CCRenderTexture* renderTexture = [[CCRenderTexture alloc] initWithWidth:screenSize.width
height:screenSize.height
pixelFormat:kCCTexture2DPixelFormat_RGBA8888];
[renderTexture begin];
//Draw the layer
[self draw];
//Read the pixel
glReadPixels((GLint)location.x,(GLint)location.y, kHITTEST_WIDTH, kHITTEST_HEIGHT, GL_RGBA, GL_UNSIGNED_BYTE, pixel);
//Cleanup
[renderTexture end];
[renderTexture release];
//Test if the pixel's alpha byte is transparent
return (pixel[3] == 0);
}
if Lio's solution doesn't work, you may add add transparent sprite as a child you yours, place it just under your non-transparent area with size of this non-tranparent area and resive all touches by this new transparent sprite, but not by original sprite.
Here is my solution to your requirement, let me know if it works or not
Create a Category on CCMenu with Name Transparent
File CCMenu+Tranparent.h
#import "CCMenu.h"
#interface CCMenu (Transparent)
#end
File CCMenu+Tranparent.m
#import "CCMenu+Transparent.h"
#import "cocos2d.h"
#implementation CCMenu (Transparent)
-(CCMenuItem *) itemForTouch: (UITouch *) touch{
CGPoint touchLocation = [touch locationInView: [touch view]];
touchLocation = [[CCDirector sharedDirector] convertToGL: touchLocation];
CCMenuItem* item;
CCARRAY_FOREACH(children_, item){
UInt8 data[4];
// ignore invisible and disabled items: issue #779, #866
if ( [item visible] && [item isEnabled] ) {
CGPoint local = [item convertToNodeSpace:touchLocation];
/*
TRANSPARENCY LOGIC
*/
//PIXEL READING 1 PIXEL AT LOCATION
CGRect r = [item rect];
r.origin = CGPointZero;
if( CGRectContainsPoint( r, local ) ){
if([NSStringFromClass(item.class) isEqualToString:NSStringFromClass([CCMenuItemImage class])]){
CCRenderTexture* renderTexture = [[CCRenderTexture alloc] initWithWidth:item.boundingBox.size.width * CC_CONTENT_SCALE_FACTOR()
height:item.boundingBox.size.height * CC_CONTENT_SCALE_FACTOR()
pixelFormat:kCCTexture2DPixelFormat_RGBA8888];
[renderTexture begin];
[[(CCMenuItemImage *)item normalImage] draw];
data[3] = 1;
glReadPixels((GLint)local.x,(GLint)local.y, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, data);
[renderTexture end];
[renderTexture release];
if(data[3] == 0){
continue;
}
}
free(data);
return item;
}
}
}
return nil;
}
#end
This will check for pixel for returning the CCMenuItem.
Its working fine here.. let me know if you face any issues
-Paresh Rathod
Cocos2d Lover
The solution that worked great for me was using Sprite sheets. I use TexturePacker to create sprite sheets. Steps to create sprite sheet using TexturePacker:
1. Load all the image (.png) files into TexturePacker.
2. Chose data format as coco2d and choose PVR as the texture format.
3. Load the sprite sheet into your code and extract images from your sprite sheet.
Detailed description can be found here.