Question

因为我是cocos2d的新手，我正在努力奋斗。任何人都建议我如何解决这个问题。

我有3个盒子（运动体）
还有多个球（动态体），每个球都有一个标签值（箱号）。
我在射球的位置和方块之间有一些障碍（运动体）。

场景是我将随机获得箱号：2（第二个方框）并将其设置为球的标签值。并且球应该完全进入第二个方框，即使它击中了障碍物。如果我得到下一个球的方框号为3，那么球应该进入第三个方框。

任何人都可以建议我，

谢谢你， Monish

Answer 1

这是一个创建球和返回的简单助手类。您可以使用类似的方法制作盒子。

//
//  Ball.h
//  BouncingBall
//
//  Created by Omar Hussain on 8/12/10.
//  Copyright 2010 __MyCompanyName__. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "cocos2d.h"
#import "Box2D.h"

class Ball : public CCSprite {
public:
    CCSprite *sprite;
    b2BodyDef ballBodyDef;
    b2Body *ballBody;
    b2FixtureDef ballShapeDef;
    b2Fixture *fixture;
    Ball(b2World *world);
    b2Vec2 disp;
    CCSprite *shadowBall;
    b2World *world;
    bool isAnimating;
    void SetBallOverlap(bool willOverlap, int scale);
    void Destroy();
};


#import "Ball.h"

#define Density 1.0f
#define Friction 1.0f
#define Restitution 0.8f
#define PTM_RATIO 32
#define SpriteRadius 40.5


Ball::Ball(b2World *world){
    this->world = world;
    this->sprite = [CCSprite spriteWithFile:@"5.png"];
    [sprite setPosition:ccp(160,460)];  
    this->isAnimating = false;
    //Set up sprite
    ballBodyDef.type = b2_dynamicBody;
    ballBodyDef.position.Set(160/PTM_RATIO, 460/PTM_RATIO);
    ballBodyDef.userData = sprite;
    this->ballBody = world->CreateBody(&ballBodyDef);

    b2CircleShape circle;
    circle.m_radius = SpriteRadius/PTM_RATIO;

    ballShapeDef.shape = &circle;
    ballShapeDef.density = Density;
    ballShapeDef.friction =Friction;
    ballShapeDef.restitution = Restitution;
    this->fixture = this->ballBody->CreateFixture(&ballShapeDef);

    //this->shadowBall = [TSprite spriteWithFile:@"ball_shadow.png"];


}
void Ball::SetBallSize(int scale){
    this->ballBody->DestroyFixture(fixture);
    this->world->DestroyBody(ballBody);

    ballBodyDef.type = b2_dynamicBody;
    ballBodyDef.position.Set(160/PTM_RATIO, 460/PTM_RATIO);
    ballBodyDef.userData = sprite;
    this->ballBody = world->CreateBody(&ballBodyDef);
    float  correctedScale = scale/9.0;
    b2CircleShape circle;
    circle.m_radius = (correctedScale *SpriteRadius)/PTM_RATIO;

    ballShapeDef.shape = &circle;
    ballShapeDef.density = Density;
    ballShapeDef.friction = Friction;
    ballShapeDef.restitution = Restitution;
    this->fixture = this->ballBody->CreateFixture(&ballShapeDef);
    //this->shadowBall.scale = scale;
    this->sprite.scale = correctedScale;
}
void Ball::SetBallOverlap(bool willOverlap, int scale){
    this->world->DestroyBody(ballBody);

    ballBodyDef.type = b2_dynamicBody;
    ballBodyDef.position.Set(160/PTM_RATIO, 460/PTM_RATIO);
    ballBodyDef.userData = sprite;
    this->ballBody = world->CreateBody(&ballBodyDef);
    float  correctedScale = scale/9.0;
    b2CircleShape circle;
    circle.m_radius = (correctedScale *SpriteRadius)/PTM_RATIO;

    ballShapeDef.shape = &circle;
    ballShapeDef.density = Density;
    ballShapeDef.friction = Friction;
    ballShapeDef.restitution = Restitution;
    if(willOverlap)
        ballShapeDef.filter.groupIndex = 1;
    else 
        ballShapeDef.filter.groupIndex = -1;
    this->ballBody->CreateFixture(&ballShapeDef);
}
void Ball::Destroy(){
    this->ballBody->DestroyFixture(fixture);
    this->world->DestroyBody(ballBody);
}

如何手动制作动态的身体（球）进入box2d iPhone的盒子

1 个答案: