CCSprite(播放器)在移动设备左侧时从平台上掉落

Question

在我的游戏中，我放置了连续移动的平台和一个玩家。玩家在每个平台上跳跃，但平台从左向右移动，当玩家坐在移动的平台上时，平台也会随着平台滑动。

但问题是，当平台与屏幕左侧边缘碰撞并开始向右移动时，我的玩家不断向左侧移动，而没有与平台停止并掉落。如何停止玩家的后移动？就好像我们从车上摔下来时，会跳过玻璃：（

在Init方法中，我正在创建播放器。CCSprite *_player在头文件中声明。

// Creates player
_player = [CCSprite spriteWithImageNamed: @"Assets.atlas/Player.png"];
[_player setPosition: ccp(160.0f, 160.0f)];
_player.physicsBody = [CCPhysicsBody bodyWithRect:(CGRect){CGPointZero, _player.contentSize} cornerRadius:0]; // 1
_player.physicsBody.collisionGroup = @"playerGroup"; // 2
_player.physicsBody.collisionType = @"player";
//[_physicsWorld addChild:_player];
[_foreground addChild: _player];

_foreground是添加平台的CCNode，当玩家向上移动时，平台可以向下滚动，以产生玩家向上运动的效果。

//This is how platform node is added in init method.
PlatformNode *platform3 = (PlatformNode *)[PlatformNode node];
[platform3 createPlatformAtPosition:CGPointMake(110, 50) ofType: PLATFORM_NORMAL];
[_foreground addChild: platform3];

实现了createPlatform...方法来放置精灵和物理体。请参阅PlatformNode.m中编写的方法代码。

- (void) createPlatformAtPosition:(CGPoint) position ofType:(PlatformType) type {
    //PlatformNode *node = [PlatformNode node];
    if (type == PLATFORM_BREAK) {
        _sprite = [CCSprite spriteWithImageNamed: @"PlatformBreak.png"];
    } else {
        _sprite = [CCSprite spriteWithImageNamed: @"Platform.png"];
    }
    [_sprite setPosition: ccp(_sprite.contentSize.width/2, _sprite.contentSize.height/2)];
    [self addChild: _sprite];
    [self setPosition: position];
    [self setName: @"NODE_PLATFORM"];
    [self setPlatformType: type];
    self.physicsBody = [CCPhysicsBody bodyWithRect:(CGRect){CGPointZero, _sprite.contentSize} cornerRadius: 0.0];
    self.physicsBody.collisionGroup = @"platform";
    self.physicsBody.type = CCPhysicsBodyTypeStatic;
    self.physicsBody.collisionType = @"obstacle";
//    if (type == PLATFORM_MOVE) {
//    // Animate projectile
//    CCActionMoveBy* actionMove = [CCActionMoveBy actionWithDuration:4.0f position: CGPointMake(-100, 0)];
//    CCActionReverse *actionRev = [CCActionReverse actionWithAction: actionMove];
//    CCActionSequence *seq = [CCActionSequence actionWithArray: @[actionMove, actionRev]];
//    [self runAction:[CCActionRepeatForever actionWithAction: seq]];
//    }
    //return self;
}

为了使平台从左到右连续移动，实现了以下逻辑。

CGPoint actPoint=平台3位置；CGPoint extPoint=ccp（[CCCDirector sharedDirector].viewSize.width-平台3.contentSize.width*2，平台3.position.y）；CGPoint zrPoint=ccp（0，平台3.position.y）；

    //CCActionMoveBy* actionMove = [CCActionMoveTo actionWithDuration:((ccpSub(actPoint, zrPoint).x * 8.0) / extPoint.x) position: CGPointMake(0, platform3.position.y)];
    CCActionMoveBy* actionMoveF = [CCActionMoveTo actionWithDuration:8.0f position: extPoint];
CCActionMoveBy* actionMoveR = [CCActionMoveTo actionWithDuration:8.0f position: zrPoint];
    CCActionSequence *seq = [CCActionSequence actionWithArray: @[actionMoveF, actionMoveR]];
//CCActionReverse *actR = [CCActionReverse actionWithAction: seq];
//CCActionSequence *act = [CCActionSequence actionWithArray: @[seq, actR]];
    [platform3 runAction:[CCActionRepeatForever actionWithAction: seq]];

有人能帮我吗？

Answer 1

我解决了这个问题。从这里的链接中获得的想法：Cocos2d 3.0+花栗鼠+CCA动画：用动画对象移动物理体。怎样

我取了一个临时变量来保持球员所站的地面值。该代码是用碰撞检测方法编写的。

-(BOOL)ccPhysicsCollisionBegin:(CCPhysicsCollisionPair *)pair player:(CCSprite *)player obstacle:(CCCustomSprite *)obstacle {
    // Taken the ground as temporary variable when player collides with the obstacle
    _ground = obstacle;
    return YES;
}

现在触摸开始方法

-(void) touchBegan:(UITouch *)touch withEvent:(UIEvent *)event {
    // Remove the reference from the ground as the player jumps up from the ground, needs to release the ground first in order to avoid its velocity
    _ground = nil;
    // Making a jump
    [_player.physicsBody applyImpulse: ccp(0, _player.physicsBody.mass * JUMP_IMPULSE)];
}

现在应用与地面速度相同的速度，但确保在平台仅水平移动时仅更改x值。

- (void) update:(CFTimeInterval)currentTime {
  if (_ground) {
        CGPoint veloc = _ground.physicsBody.velocity;
        _player.physicsBody.velocity = ccp(veloc.x, _player.physicsBody.velocity.y);
    }
}

工作对我来说很好。但另一个问题是我无法提高跳跃速度。例如，我的选手在2秒内跳了100分，我想在0.5秒内完成，我能完成吗？