How to make a hero class for chipmunk?

cocos2d for iPhone » Programming » physics

How to make a hero class for chipmunk?

(13 posts) (4 voices)

Started 1 year ago by Jack Here
Latest reply from Matz0r

Tags:

Jack Here
Member

Im trying to make a hero class for chipmunk. So far I have this in my header:

@interface Hero: cpCCSprite {
	cpShape *shape;
	cpSpace *space;
}
+(id)hero;
-(id)initHero;

and this in my m file:

@implementation Hero

+ (id)hero {
	NSLog(@"inside hero class method");
	return [[self alloc] initHero];
}

- (id) initHero {
	self = [super initWithFile:@"ball.png"];
	if(self != nil) {
		cpBody *body = cpBodyNew(250.0f, INFINITY);
		body->p = self.position;

		shape = cpCircleShapeNew(body, 29.0f, cpvzero);
		shape->data = self;
		shape->e = 0.8;
		shape->u = 0.7;
		shape->collision_type = 2;
	}
	return self;
}

then i init it in my gamescreen with:

ball = [Hero hero];
		[self addChild:ball];

However, it does not react in the gamescreen...it should fall to the bottom. How do I get my hero class to react to the spacemanager?

Posted 1 year ago #

Paul
Member

Do you checked if cpSpace contains the ball?
Does cpSpace get updated?

Posted 1 year ago #
Jack Here
Member

Now this code is crashing on me, so I cant even check. Maybe this is not the best way to do create this?

Posted 1 year ago #
Paul
Member

I can't assess it. I used the way to create them without SpaceManager. There's a nice a tutorial which may will help: http://www.alexandre-gomes.com/articles/chipmunk/

Posted 1 year ago #
mobilebros
Moderator
If hero is a sub-class of cpCCSprite you already have a "shape" property, no sense in defining another one; access it with "self.shape".

The second problem is that you're not adding it to the space, if using SpaceManager try:
```
ball = [Hero hero];

//This line is neeeded
[smgr addShape:hero.shape];

[self addChild:ball];
```
Posted 1 year ago #

Jack Here
Member

when i do this with ccCCSprite it crashes, but if i do it with CCSprite it works.

@interface Hero: CCSprite {

}
+(id)hero;
-(id)initHero;

@end

@implementation Hero

+ (id)hero {
	NSLog(@"inside hero class method");
	return [[self alloc] initHero];
}

- (id) initHero {
	self = [super initWithFile:@"ball.png"];
	if(self != nil) {
		/*
		cpBody *body = cpBodyNew(250.0f, INFINITY);
		body->p = self.position;

		self.shape = cpCircleShapeNew(body, 29.0f, cpvzero);
		self.shape->data = self;
		self.shape->e = 0.8;
		self.shape->u = 0.7;
		self.shape->collision_type = 2;
		 */
	}
	return self;
}

@end

works...but

@interface Hero: CCSprite {....

does not, is this not allowed with ccCCSprite?

Posted 1 year ago #

mobilebros
Moderator

hmmm i'm not sure what the issue is, I'd have to see both your files; theoretically what you're doing should be ok.... of course if the CCSprite version works for you thats fine too. support@mobile-bros.com if you want to share your files, or I guess even post them here...

Posted 1 year ago #

Jack Here
Member

This is the h file:

#import <Foundation/Foundation.h>
#import "cocos2d.h"
#import "SpaceManager.h"
#import "chipmunk.h"
#import "cpCCSprite.h"
#import "cpBody.h"
#import "cpShape.h"
#import "cpShapeNode.h"

@interface Hero: cpCCSprite {

}
+(id)hero;
-(id)initHero;

@end

and the m file:

#import "Hero.h"

@implementation Hero

+ (id)hero {
	NSLog(@"inside hero class method");
	return [[self alloc] initHero];
}

- (id) initHero {
	self = [super initWithFile:@"ball.png"];
	if(self != nil) {

		cpBody *body = cpBodyNew(250.0f, INFINITY);
		body->p = cpv(250, 160);

		self.shape = cpCircleShapeNew(body, 29.0f, cpvzero);
		self.shape->data = self;
		self.shape->e = 0.8;
		self.shape->u = 0.7;
		self.shape->collision_type = 2;

	}
	return self;
}

@end

and then Im using it in my gamelayer with this:

ball = [Hero hero];
		[smgr addShape:ball.shape];
		[self addChild:ball];

ship is cpCCSprite *ball; in header.

Posted 1 year ago #

mobilebros
Moderator
Wow ok that was trickier than I thought, I'll try to explain. cpCCSprite does not actually override initWithFile (it actually probably should, so thank you for that). Since it does not it does not initialize things properly. Sooo to get your class to work I had to do this:
```
#import "Hero.h"

@implementation Hero

+ (id)hero {
	NSLog(@"inside hero class method");
	return [[self alloc] initHero];
}

- (id) initHero {
	self = [super initWithFile:@"gear.png"];
	if(self != nil)
	{
		cpBody *body = cpBodyNew(250.0f, INFINITY);
		body->p = cpv(250, 160);

		cpShape *shape = cpCircleShapeNew(body, 29.0f, cpvzero);

		CPCCNODE_MEM_VARS_INIT(shape)

		shape->e = 0.8;
		shape->u = 0.7;
		shape->collision_type = 2;

	}
	return self;
}

@end
```
Basically I create the shape separately but then hand it off to that handy macro that will expand and properly initialize everything, it will automatically add self to shape->data so I removed your line that did so. I did a quick test and everything checks out, good luck.
Posted 1 year ago #
Jack Here
Member

oh sweet! thanks a lot, that was becoming a big headache.

Posted 1 year ago #
Matz0r
Member
What if I want to delete the body inside the subclass?
```
-(void) die {
	self.visible=NO;

}
```
Regards
Posted 10 months ago #

mobilebros
Moderator

-(void) die:(SpaceManager*)smgr
 {
	self.visible=NO;
        [smgr removeAndFreeShape:self.shape];
        self.shape = nil;
}

Posted 10 months ago #

Matz0r
Member

Thanks mobilebros!, but I'm not using spacemanager since I'm using chipmunk for collision detection only.

Posted 10 months ago #

RSS feed for this topic

Reply

You must log in to post.