box2d collision

//
//  HelloWorldLayer.mm
//  maliaobox2d
//
//  Created by ivt on 6/3/13.
//  Copyright __MyCompanyName__ 2013. All rights reserved.
//

// Import the interfaces
#import "HelloWorldLayer.h"

// Needed to obtain the Navigation Controller
#import "AppDelegate.h"

#import "PhysicsSprite.h"
#import "CAnimationHelper.h"

#import <vector>
#import <algorithm>
#import "MyContactListener.h"
enum {
	kTagParentNode = 1,
};


#pragma mark - HelloWorldLayer

@interface HelloWorldLayer()
-(void) initPhysics;
-(void) addNewSpriteAtPosition:(CGPoint)p;
-(void) createMenu;
@end

@implementation HelloWorldLayer

+(CCScene *) scene
{
	// 'scene' is an autorelease object.
	CCScene *scene = [CCScene node];
	
	// 'layer' is an autorelease object.
	HelloWorldLayer *layer = [HelloWorldLayer node];
	
	// add layer as a child to scene
	[scene addChild: layer];
	
	// return the scene
	return scene;
}

-(void) menuItem1Touched:(id)sender{
    
    
    
}
-(id) init
{
	if( (self=[super init])) {
		
		// enable events
		
		self.isTouchEnabled = YES;
		self.isAccelerometerEnabled = YES;
		CGSize s = [CCDirector sharedDirector].winSize;
        
        
        
       		// init physics
		[self initPhysics];
		
		// create reset button
		[self createMenu];
        
        
    //    CCTMXTiledMap *map = [CCTMXTiledMap tiledMapWithTMXFile:@"map.tmx"];
		//[self addChild:map];
		//Set up sprite
		
#if 1
		// Use batch node. Faster
		CCSpriteBatchNode *parent = [CCSpriteBatchNode batchNodeWithFile:@"blocks.png" capacity:100];
		spriteTexture_ = [parent texture];
#else
		// doesn't use batch node. Slower
		spriteTexture_ = [[CCTextureCache sharedTextureCache] addImage:@"blocks.png"];
		CCNode *parent = [CCNode node];
#endif
		[self addChild:parent z:0 tag:kTagParentNode];
		
		
		[self addNewSpriteAtPosition:ccp(s.width/2, s.height/2)];
		
		CCLabelTTF *label = [CCLabelTTF labelWithString:@"Tap screen" fontName:@"Marker Felt" fontSize:32];
		[self addChild:label z:0];
		[label setColor:ccc3(0,0,255)];
		label.position = ccp( s.width/2, s.height-50);
		
		[self scheduleUpdate];
        
        
        
        
        
        _contactListener =new MyContactListener();
        world->SetContactListener(_contactListener);
	}
	return self;
}

-(void) dealloc
{
	delete world;
	world = NULL;
	
	delete m_debugDraw;
	m_debugDraw = NULL;
	
	[super dealloc];
}	

-(void) createMenu
{
	// Default font size will be 22 points.
	[CCMenuItemFont setFontSize:22];
	
	// Reset Button
	CCMenuItemLabel *reset = [CCMenuItemFont itemWithString:@"Reset" block:^(id sender){
		[[CCDirector sharedDirector] replaceScene: [HelloWorldLayer scene]];
	}];
	
	// Achievement Menu Item using blocks
	CCMenuItem *itemAchievement = [CCMenuItemFont itemWithString:@"Achievements" block:^(id sender) {
		
		
		GKAchievementViewController *achivementViewController = [[GKAchievementViewController alloc] init];
		achivementViewController.achievementDelegate = self;
		
		AppController *app = (AppController*) [[UIApplication sharedApplication] delegate];
		
		[[app navController] presentModalViewController:achivementViewController animated:YES];
		
		[achivementViewController release];
	}];
	
	// Leaderboard Menu Item using blocks
	CCMenuItem *itemLeaderboard = [CCMenuItemFont itemWithString:@"Leaderboard" block:^(id sender) {
		
		
		GKLeaderboardViewController *leaderboardViewController = [[GKLeaderboardViewController alloc] init];
		leaderboardViewController.leaderboardDelegate = self;
		
		AppController *app = (AppController*) [[UIApplication sharedApplication] delegate];
		
		[[app navController] presentModalViewController:leaderboardViewController animated:YES];
		
		[leaderboardViewController release];
	}];
    
    CCMenuItemFont* right= [CCMenuItemFont itemFromString:@"right!"
                                                     block:^(id sender){
                                                       
                                                         b2Vec2 v=maliaobody->GetLinearVelocity();
                                                         v.x=5.0f;
                                                         
                                                         maliaobody->SetLinearVelocity(v);
                                                     }];
    CCMenuItemFont* left= [CCMenuItemFont itemFromString:@"left"
                                                     block:^(id sender){
                                                         
                                                         b2Vec2 v=maliaobody->GetLinearVelocity();
                                                         v.x=-5.0f;
                                                         
                                                         maliaobody->SetLinearVelocity(v);
                                                     }];

    
    CCMenuItemFont* jump= [CCMenuItemFont itemFromString:@"jump"
                                                   block:^(id sender){
                                                     
                                                       b2Vec2 v=maliaobody->GetLinearVelocity();
                                                       v.y=8.0f;
                                                       
                                                       maliaobody->SetLinearVelocity(v);
                                                   }];

	
	CCMenu *menu = [CCMenu menuWithItems:itemAchievement, reset, right,left,jump, nil];
	
	[menu alignItemsVertically];
	
	CGSize size = [[CCDirector sharedDirector] winSize];
	[menu setPosition:ccp( size.width/2, size.height/2)];
	
	
	[self addChild: menu z:-1];
    
    
         

}

-(void) initPhysics
{
	
	CGSize s = [[CCDirector sharedDirector] winSize];
	
	b2Vec2 gravity;
	gravity.Set(0.0f, -10.0f);
	world = new b2World(gravity);
	
	
	// Do we want to let bodies sleep?
	world->SetAllowSleeping(true);
	
	world->SetContinuousPhysics(true);
    
    _contactListener =new MyContactListener();
    world->SetContactListener(_contactListener);

	
	m_debugDraw = new GLESDebugDraw( PTM_RATIO );
	world->SetDebugDraw(m_debugDraw);
	
	uint32 flags = 0;
	flags += b2Draw::e_shapeBit;
	//		flags += b2Draw::e_jointBit;
	//		flags += b2Draw::e_aabbBit;
	//		flags += b2Draw::e_pairBit;
	//		flags += b2Draw::e_centerOfMassBit;
	m_debugDraw->SetFlags(flags);		
	
	
	// Define the ground body.
	b2BodyDef groundBodyDef;
	groundBodyDef.position.Set(0, 0); // bottom-left corner
	
	// Call the body factory which allocates memory for the ground body
	// from a pool and creates the ground box shape (also from a pool).
	// The body is also added to the world.
	b2Body* groundBody = world->CreateBody(&groundBodyDef);
	
	// Define the ground box shape.
	b2EdgeShape groundBox;
	
	
	// bottom
	
	groundBox.Set(b2Vec2(0,0), b2Vec2(s.width/PTM_RATIO,0));
	groundBody->CreateFixture(&groundBox,0);
	
/*	// top
	groundBox.Set(b2Vec2(0,s.height/PTM_RATIO), b2Vec2(s.width/PTM_RATIO,s.height/PTM_RATIO));
	groundBody->CreateFixture(&groundBox,0);
*/
	// left
	groundBox.Set(b2Vec2(0,s.height/PTM_RATIO), b2Vec2(0,0));
	groundBody->CreateFixture(&groundBox,0);
	
	// right
	groundBox.Set(b2Vec2(s.width/PTM_RATIO,s.height/PTM_RATIO), b2Vec2(s.width/PTM_RATIO,0));
	groundBody->CreateFixture(&groundBox,0);
    
   
    
    //利用帧缓存中的文件名创建动作
    
    [[CCSpriteFrameCache sharedSpriteFrameCache]addSpriteFramesWithFile:@"game.plist"];
    PhysicsSprite *mySpriteByF =[PhysicsSprite spriteWithSpriteFrameName:@"Frame0.swf"];
     mySpriteByF.tag=10;
    [self addChild:mySpriteByF];
    
    CCAnimation *anim=[CCAnimation animationWithFrame:@"Frame" frameCount:5 delay:0.1];
    CCAnimate *animate = [CCAnimate actionWithAnimation:anim];
    CCSequence *seq = [CCSequence actions:animate,nil];
    CCRepeatForever *repeat = [CCRepeatForever actionWithAction:seq];
    [mySpriteByF runAction:repeat];
    
    
    
    
    b2BodyDef bodyDef;
	bodyDef.type = b2_dynamicBody;
	bodyDef.position.Set(0.5,1);
    bodyDef.userData=mySpriteByF;
    
    	maliaobody = world->CreateBody(&bodyDef);
    maliaobody->SetFixedRotation(true);

    
	
	// Define another box shape for our dynamic body.
	b2PolygonShape dynamicBox;
	dynamicBox.SetAsBox(.1f, .2f);//These are mid points for our 1m box
	
	// Define the dynamic body fixture.
	b2FixtureDef fixtureDef;
	fixtureDef.shape = &dynamicBox;
	fixtureDef.density = 1.0f;
	fixtureDef.friction = 0.3f;
    
    	maliaobody->CreateFixture(&fixtureDef);
    

    
    [mySpriteByF setPhysicsBody:maliaobody];
   

    
    
    
    [[CCSpriteFrameCache sharedSpriteFrameCache]addSpriteFramesWithFile:@"game1.plist"];
    m_Score=[CCSprite spriteWithSpriteFrameName:@"Score0.swf"];
    
    m_Score.position=ccp(80,s.height*0.5);
    [self addChild:m_Score];
    CCAnimation *anim1=[CCAnimation animationWithFrame:@"Score" frameCount:25 delay:0.1];
    CCAnimate *animate1= [CCAnimate actionWithAnimation:anim1];
    CCSequence *seq1 = [CCSequence actions:animate1,nil];
    CCRepeatForever *repeat1 = [CCRepeatForever actionWithAction:seq1];
    [m_Score runAction:repeat1];
    
 

}

-(void) draw
{
	//
	// IMPORTANT:
	// This is only for debug purposes
	// It is recommend to disable it
	//
	[super draw];
	
	ccGLEnableVertexAttribs( kCCVertexAttribFlag_Position );
	
	kmGLPushMatrix();
	
	world->DrawDebugData();	
	
	kmGLPopMatrix();
}


-(void) addWallSpriteAtPosition
{
	//CCLOG(@"Add sprite %0.2f x %02.f",p.x,p.y);
	CCNode *parent = [self getChildByTag:kTagParentNode];
	
	//We have a 64x64 sprite sheet with 4 different 32x32 images.  The following code is
	//just randomly picking one of the images
	int idx = (CCRANDOM_0_1() > .5 ? 0:1);
	int idy = (CCRANDOM_0_1() > .5 ? 0:1);
	PhysicsSprite *sprite = [PhysicsSprite spriteWithTexture:spriteTexture_ rect:CGRectMake(32 * idx,32 * idy,32,32)];
    sprite.tag=11;
	[parent addChild:sprite];
	
	sprite.position = ccp( 3,3);
	
	// Define the dynamic body.
	//Set up a 1m squared box in the physics world
	b2BodyDef bodyDef;
	bodyDef.type = b2_dynamicBody;
	bodyDef.position.Set(3,3);
    bodyDef.userData=sprite;
	b2Body *body = world->CreateBody(&bodyDef);
    
	
	// Define another box shape for our dynamic body.
	b2PolygonShape dynamicBox;
	dynamicBox.SetAsBox(.5f, 0.5f);//These are mid points for our 1m box
	
	// Define the dynamic body fixture.
	b2FixtureDef fixtureDef;
	fixtureDef.shape = &dynamicBox;
	fixtureDef.density = 100.0f;
	fixtureDef.friction = 0.3f;
    
	body->CreateFixture(&fixtureDef);
    
    
    
	[sprite setPhysicsBody:body];
}

-(void) addNewSpriteAtPosition:(CGPoint)p
{
	CCLOG(@"Add sprite %0.2f x %02.f",p.x,p.y);
	CCNode *parent = [self getChildByTag:kTagParentNode];
	
	//We have a 64x64 sprite sheet with 4 different 32x32 images.  The following code is
	//just randomly picking one of the images
	int idx = (CCRANDOM_0_1() > .5 ? 0:1);
	int idy = (CCRANDOM_0_1() > .5 ? 0:1);
	PhysicsSprite *sprite = [PhysicsSprite spriteWithTexture:spriteTexture_ rect:CGRectMake(32 * idx,32 * idy,32,32)];
    sprite.tag=2;
	[parent addChild:sprite];
	
	sprite.position = ccp( p.x, p.y);
	
	// Define the dynamic body.
	//Set up a 1m squared box in the physics world
	b2BodyDef bodyDef;
	bodyDef.type = b2_dynamicBody;
	bodyDef.position.Set(p.x/PTM_RATIO, p.y/PTM_RATIO);
    bodyDef.userData=sprite;
	b2Body *body = world->CreateBody(&bodyDef);
    
    body->SetGravityScale(0);
	
	// Define another box shape for our dynamic body.
	b2PolygonShape dynamicBox;
	dynamicBox.SetAsBox(.5f, 0.5f);//These are mid points for our 1m box
	
	// Define the dynamic body fixture.
	b2FixtureDef fixtureDef;
	fixtureDef.shape = &dynamicBox;	
	fixtureDef.density = 100.0f;
	fixtureDef.friction = 0.3f;
   
	body->CreateFixture(&fixtureDef);
    
    
   
	[sprite setPhysicsBody:body];
}

-(void) update: (ccTime) dt
{
	//It is recommended that a fixed time step is used with Box2D for stability
	//of the simulation, however, we are using a variable time step here.
	//You need to make an informed choice, the following URL is useful
	//http://gafferongames.com/game-physics/fix-your-timestep/
	
	int32 velocityIterations = 8;
	int32 positionIterations = 1;
	
	// Instruct the world to perform a single step of simulation. It is
	// generally best to keep the time step and iterations fixed.
	world->Step(dt, velocityIterations, positionIterations);
    
    
    
 
    
    
    
    
    std::vector<b2Body *>toDestroy;
    std::vector<MyContact>::iterator pos;
    for(pos = _contactListener->_contacts.begin();
        pos != _contactListener->_contacts.end(); ++pos) {
        MyContact contact =*pos;
        
        b2Body *bodyA = contact.fixtureA->GetBody();
        b2Body *bodyB = contact.fixtureB->GetBody();
        if (bodyA->GetUserData() != NULL && bodyB->GetUserData() != NULL) {
            CCSprite *spriteA = (CCSprite *) bodyA->GetUserData();
            CCSprite *spriteB = (CCSprite *) bodyB->GetUserData();
            
            if (spriteA.tag ==10&& spriteB.tag ==2) {
                NSLog(@"collision");
                b2Vec2 v=bodyB->GetLinearVelocity();
                //v.y=50.0f;
              //  v.x=50.0f;
                bodyB->SetLinearVelocity(v);
                //  toDestroy.push_back(bodyA);
            } else if (spriteA.tag ==2&& spriteB.tag ==10) {
                  NSLog(@"collision");
              //  toDestroy.push_back(bodyB);
            }
             
        }
    }
    
    std::vector<b2Body *>::iterator pos2;
    for(pos2 = toDestroy.begin(); pos2 != toDestroy.end(); ++pos2) {
        b2Body *body =*pos2;
        if (body->GetUserData() != NULL) {
            CCSprite *sprite = (CCSprite *) body->GetUserData();
            //[_spriteSheet removeChild:sprite cleanup:YES];
        }
       // world->DestroyBody(body);
    }
    
    }

- (void)ccTouchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
	//Add a new body/atlas sprite at the touched location
	for( UITouch *touch in touches ) {
		CGPoint location = [touch locationInView: [touch view]];
		
		location = [[CCDirector sharedDirector] convertToGL: location];
		
		[self addNewSpriteAtPosition: location];
	}
}

#pragma mark GameKit delegate

-(void) achievementViewControllerDidFinish:(GKAchievementViewController *)viewController
{
	AppController *app = (AppController*) [[UIApplication sharedApplication] delegate];
	[[app navController] dismissModalViewControllerAnimated:YES];
}

-(void) leaderboardViewControllerDidFinish:(GKLeaderboardViewController *)viewController
{
	AppController *app = (AppController*) [[UIApplication sharedApplication] delegate];
	[[app navController] dismissModalViewControllerAnimated:YES];
}

@end

转载于:https://my.oschina.net/u/942328/blog/135331