Using Subclassed CCSprites « cocos2d for iPhone

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Using Subclassed CCSprites

(28 posts) (8 voices)

Started 1 year ago by Joethemonkey101
Latest reply from Millawub

Tags:

CCSprite

Joethemonkey101
On probation

Hi guys, I'm getting a bit confused. I started subclassing sprites, the enemy and main character. I put all the code (like spawn code, moving code from using a spritesheet, position, and other stuff) in the subclassed file. Today I wanted to start working on the game, so I imported and @class the sprites. I'm getting confused on how to reuse methods and other things from the sprites. For example, I have a method that spawns a mole sprite. How do I use that method in my Gameplay scene? I also have position on my sprite. How do I set the position without rewriting all the code?

Thanks in advance.

Posted 1 year ago #
Joethemonkey101
On probation

Sorry I made it really complicated. Basically I want to know how to use code in my subclassed sprite in other files.

Posted 1 year ago #
abitofcode
Moderator

Command+c, Command+v

;)

Posted 1 year ago #
Joethemonkey101
On probation

@abitofcode why would I subclass a sprite if I have to put all of the code in the file i want to use it in? Thats why i subclassed it.

Posted 1 year ago #
Joethemonkey101
On probation

Also in I subclassed the spritesheet and movement and everything. Do I need to make a new CCAction and synthesize it and everything? How do I use all the methods?

Posted 1 year ago #
abitofcode
Moderator

ho hum

Have you read the following thread on composition versus inheritance http://www.cocos2d-iphone.org/forum/topic/8453

It sounds like the confusion is a result of embedding code in the wrong places, I'm not sure what you understand by spawn but you'd probably be better having some controller object (or layer) manage the creation of moles. You could be talking about autoreleased creation convenience methods I guess but without more information it's a hard to diagnose the problem.

If you've subclassed CCSprite correctly then you should just be able to call your methods on (sorry send messages to) the subclassed sprite as well as use the standard CCSprite methods.

Posted 1 year ago #
Joethemonkey101
On probation

If you've subclassed CCSprite correctly then you should just be able to call your methods on (sorry send messages to) the subclassed sprite as well as use the standard CCSprite methods.

Ok that's exactly what I want to know how to do. I want to know how to call methods that I have in my mole file to my Gameplay file.

Posted 1 year ago #
Joethemonkey101
On probation

Anyone? This is rather important for me...

Posted 1 year ago #
hm50
Member

{mole myMethod:var];

Posted 1 year ago #
Joethemonkey101
On probation

@hm50 I also wanted to know if I had to redeclare my sprites in my .m, and also, if I tried something like this [mole setPosition:spawnMole];
I get the error spawnMole is undeclared (it's a method in my Mole.m).

Posted 1 year ago #
abitofcode
Moderator
I refer you to my previous comment.

If you have subclassed correctly then for a sprite e.g EnemySprite which is subclassed from CCSprite as in;
```
@interface EnemySprite : CCSprite
{
  // Enemy specific ivars here
}

-(void) setAbilityToFollowSimpleInstructions:(BOOL)able;
```
You can now use EnemySprite instances just as you would CCSprite instances, with the bonus that any methods you add to EnemySprite will also be available.
```
EnemySprite *enemy1 = [EnemySprite spriteFromFile.... etc 

// Standard method from CCSprite
[enemy1 setPosition:ccp(100.0f, 100.0f)];

// method available only to EnemySprite instances
[enemy1 setAbilityToFollowSimpleInstructions:NO];
```
There may be typos above, its just a quick explanation. You may want to try heading over to the library and getting one of those large papery things off the shelf. Learn Objective-C for the mac is quite a good one.
Posted 1 year ago #
Joethemonkey101
On probation

Thanks @abitofcode, I forgot putting the methods in the .h. Thanks for clearing everything up as well.
I'm wondering though, how would I go about telling the sprite to move? I have all the spritesheet code and everything else in the subclass, too.
I also tried to build [mole spawnMole]; but I get the warning Mole may not respond to -spawnMole.

Posted 1 year ago #
Joethemonkey101
On probation

@hm50 suggested [mole myMethod:var];
which would be fine, except I don't need/use a var. All I want to do is run a method.

Posted 1 year ago #
abitofcode
Moderator
```
[mole myMethod];
```
Posted 1 year ago #
Joethemonkey101
On probation

@abitofcode that's what I tried. spawnMole is a method, so I did [mole spawnMole];

Posted 1 year ago #
David994A
Member

@Joethemonkey101 you are gettign that warning because you are most likely not subclassing CCSprite correctly therefore the compiler thinks your subclass is still a CCSprite. Since I don't have your code to see where you are creating the EnemySprite it is hard to say. I think you might have to override the factory method where a CCSprite is created, or in your case, a EnemySprite is created.

Posted 1 year ago #

Joethemonkey101
On probation

@David994A here are my classes.

#import "cocos2d.h"
@class Bunny;
@class ShootButton;

@interface Mole : CCSprite {
	int curHp;

}

@property (nonatomic, retain) CCSprite *mole;
@property (nonatomic, retain) CCAction *walkAction;
@property (nonatomic, assign) int hp;

@end

@interface NormalMole : Mole {
	Mole *mole;
	CCSpriteSheet *moleSheet;
	CGRect moleRect;
	NSMutableArray *walkFrames;
	CCAnimation *walk;
	CCAction *walkAction;
	Bunny *bunny;
	ShootButton *projectileArray;
	ShootButton *moleArray;

}
+(id)mole;
-(void)spawnMole:(id)sender;
-(void)move:(id)sender;

@end

#import "Mole.h"
#import "Bunny.h"
#import "GamePlay.h"

@implementation Mole

@synthesize mole = mole;
@synthesize walkAction = walkAction;
@synthesize hp = curHp;

@end

@implementation NormalMole

+(Mole *)mole {
	Mole *mole = [[Mole alloc] initWithFile:@"mole.png"];
	mole.hp = 2;
	return [mole autorelease];
}

-(void) spawnMole: (id) sender {
	CGSize winSize = [[CCDirector sharedDirector] winSize];
	int minY = mole.contentSize.height/2;
	int maxY = winSize.height - mole.contentSize.height/2;
	int rangeY = maxY - minY;
	int actualY = (arc4random() % rangeY) +minY;

	mole.position = ccp(winSize.width + (mole.contentSize.width/2), actualY);

	int duration = 2.0;
	id actionMove = [CCMoveTo actionWithDuration:duration position:ccp(-mole.contentSize.width/2, actualY)];
	[mole runAction:actionMove];
	mole.tag = 1;
	[moleArray addObject:moleArray];
}

-(void) move: (id) sender {
	CGPoint diff = ccpSub(bunny.position, mole.position);
	float angleRadians = atanf((float)diff.y/(float)diff.x);
	float angleDegrees = CC_RADIANS_TO_DEGREES(angleRadians);
	float cocosAngle = -1 *angleDegrees;
	if (diff.x < 0) {
		cocosAngle += 180;
	}
	mole.rotation = cocosAngle;
	ccTime duration = 0.1;
	id actionMove = [CCMoveBy actionWithDuration:duration position:ccpMult(ccpNormalize(ccpSub(bunny.position, mole.position)), 10)];
	[mole runAction:actionMove];

	[[CCSpriteFrameCache sharedSpriteFrameCache] addSpriteFramesWithFile:@"moleSheet.plist"];
	moleSheet = [CCSpriteSheet spriteSheetWithFile:@"moleSheet.png"];
	[self addChild:moleSheet];
	walkFrames = [NSMutableArray array];
	for (int i = 1; i<=8; ++i) {
		[walkFrames addObject:[[CCSpriteFrameCache sharedSpriteFrameCache] spriteFrameByName:[NSString stringWithFormat:@"mole%d.png", i]]];
	}
	walk = [CCAnimation animationWithName:@"walk" delay:0.1 frames:walkFrames];

	self.mole = [CCSprite spriteWithSpriteFrameName:@"mole1"];
	self.walkAction = [CCRepeatForever actionWithAction:[CCAnimate actionWithAnimation:walk restoreOriginalFrame:NO]];
	[mole runAction:walkAction];
	[moleSheet addChild:mole];
	float velocity = 480/96;
}	

@end

Posted 1 year ago #

Joethemonkey101
On probation

when I make the move method a part of onEnter, there aren't any errors or warnings.

Posted 1 year ago #
Joethemonkey101
On probation

I'm still having problems with this subject, can anyone help me?

Posted 1 year ago #
michaelm
Member

I bet it's how your declaring it when you create it. If you create it like this

Mole *mole = [CCSprite spriteWithFile:@"mole.png"];
it will create a ccsprite instance, you won't have your extra methods. Create it like this

Mole *mole = [Mole spriteWithFile:@"mole.png"];

Should work I think, just play around with it. That's the best way to get it.

Posted 1 year ago #
Joethemonkey101
On probation

@michaelm Thanks for the answer, but even if I make it like that, I still get the warning. I'm not even sure if the warning will affect anything, I'm just trying to fix it.

Posted 1 year ago #
Benihana
Member

@abitofcode that's what I tried. spawnMole is a method, so I did [mole spawnMole];

spawnMole is a method of NormalMole, not Mole. You need to either declare a spawnMole in Mole and override it in NormalMole, or send your message to a NormalMole instance.

Posted 1 year ago #
Joethemonkey101
On probation

@Benihana It still says NormalMole may not respond to spawnMole

Posted 1 year ago #
AcesWild
Member
JoeTheMonkey,
Are you looking at the code you are writing, or do you just want the forum members to do the work for you?

You declared the method "spawnMole" as the following:
```
-(void)spawnMole:(id)sender;
```
The you wrote above
"@abitofcode that's what I tried. spawnMole is a method, so I did [mole spawnMole];"

Look how you are calling the method!!!! You declared it to take a parameter of type "id", which you are NOT PASSING IN!!!

What if you tried this?
```
NormalMole* normalMole = [[NormalMole alloc] init]; //How do you create one of these things anyway, because based on the code, it doesn't look like you know what's going on
[normalMole: self]; //See how I am passing in a parameter as the "sender" variable that you declared the method to take?
```
Joe, there is so much wrong with your code that I don't know how you will EVER get this to work?

In your NormalMole implementation, you have a method
```
+(id)mole;
```
in your .h file, but in your .m file, you declare it as
```
@implementation NormalMole

+(Mole *)mole
```
Why isn't this returning objects of type "NormalMole*", and why doesn't it *at least* match how you declared it in your .h file?

This thread is getting VERY tiring!
Posted 1 year ago #
Joethemonkey101
On probation

Sorry @AcesWild, I'm just having trouble with this. I corrected everything you've pointed out, but for the line self.mole; I get the warning Value computed is not used.

Posted 1 year ago #
AcesWild
Member

Joe,

You are having a problem with it because your code looks like a mish-mash of different ideas all just crammed together.

I don't know what you mean by
"but for the line self.mole; I get the warning Value computed is not used. "

How is that line being used? in what context?

Posted 1 year ago #
Joethemonkey101
On probation

Thanks for all help, I finally got it all sorted out.

Posted 1 year ago #
Millawub
Member

Thank you Michealm, you answered the question I was here looking for the answer to exactly. Thanks you also to Joethemonkey101 for asking it a month before I needed the answer so it could be here for me.

Posted 1 year ago #

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