A fast, easy to use, free, and community supported 2D game engine
Nalin
Member
I want to be able to draw lines and shapes using openGL on top of a normal Cocos2D layer, but when I do so (with calls in the draw() function) they are being overdrawn by the various sprites and backgrounds that make up the layer.
Is there an (easy) way to get openGL to draw on top of the layer.
I checked the drawprimitives sample and it appears to do the same thing here.
If anyone knows how to do this it will be much appreciated.
cheers,
Nalin
draw them from a node with higher Z value.
cpk
Member
Hello,
I think that this thread may be touching on an issue that I have.
I would like to put status information (lives left, score, time played) on "top of" a
game Layer. I don't want to mix the game information with the status information
for several reasons. First, the game Layer allows the user to change the camera,
and the character moves in a space that is much bigger than the size of the device
screen. Second, it seems conceptually cleaner to not mix them.
I can do this with on OpenGL layer, but staying withing the Cocos2d iphone framework has
benefits like my not having to figure out when to and not display information in the
OpenGl layer on scene transitions. I've looked through the example code and this forum.
Would someone be kind enough to give me a hint as to how to do this "correctly".
Thanks,
Charles
cpk
Member
Sorry, but I'm going to need a bit more of a hint than that... I've tried... Can you please let me know where I'm going wrong with this, or point me to a relevant example. Many thanks in advance!!! Chuck
@interface OverlayLayer : Layer {
}
@end
// This is the layer where I want the camera fixed using sprites to indicate things
// like user score, time remaining, lives remaining...
@implementation OverlayLayer
-(id) init {
if (self = [super init]) {
CGSize screenSize = [[Director sharedDirector] displaySize];
Sprite *sprite = [[Sprite spriteWithFile:@"life.png"] retain];
[self addChild:sprite z:2];
[sprite setPosition:ccp(screenSize.width/2, screenSize.height/2)];
}
return self;
}
@end
// THis is the layer where I play around with the camera on which the game takes place...
@interface GameLayer : Layer {
}
@implementation
-(id) init {
if ((self = [super init])) {
// To allow the three touch methods to work...
isTouchEnabled = YES;
isAccelerometerEnabled = YES;
[[UIAccelerometer sharedAccelerometer] setUpdateInterval:(1.0f / 60)];
[self addChild: [OverlayLayer new] z:2];
}
return self;
}
@end
I had tried and I can't. I have a CCScene class to display both layers, the GameLayer and the UserInterfaceLayer, with the UserInterfaceLayer's z value higher than the GameLayer. Code:
#import "MultiLayer.h"
@implementation MultiLayer
#pragma mark Scene
+ (id) scene {
MultiLayer *scene = [MultiLayer node];
return scene;
}
#pragma mark Init
- (id) init {
if ((self = [super init])) {
[self addChild:[GameLayer node] z:0];
[self addChild:[UserInterfaceLayer node] z:1];
}
return self;
}
- (void) dealloc {
// End
[super dealloc];
}The UserInterfaceLayer has a function, drawHealthBar:(int)health which is called from the draw function of the GameLayer.
The health bar was drawn from the UserInterfaceLayer ( which is higher ) using Open GL Draw Primitives code but is still covered by the sprites from GameLayer.
Could someone tell me what am I doing wrong?
Thanks!
I changed the code, so the GameLayer does not call the UserInterfaceLayer. The UserInterfaceLayer will draw it in its own draw function. It worked!
Cheers!
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