cocos2d-x游戏开发系列教程-超级玛丽07-CMGameMap(六)-马里奥跳跃

当w键按下时，马里奥执行跳跃动作

执行跳跃动作也是在MarioMove函数中调用的

aaarticlea/png;base64,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" alt="" />

实际的跳跃则调用了mario对象的OnCtrlJump函数，来看看OnCtrlJump函数吧

void CMMario::OnCtrlJump()
{
	//根据马里奥当前状态 来处理
	switch(m_eCurMarioStatus)
	{
	case enMarioStatusStandLeft:	//待机 和 跑动 时 马里奥允许跳跃
	case enMarioStatusStandRight:
	case enMarioStatusRunLeft:
	case enMarioStatusRunRight:
		{
			//播放跳跃动画
			switch(m_eCurMarioLevel)
			{
			case enMarioLevelSmall:
				{
					m_pCcbReader->getAnimationManager()->runAnimationsForSequenceNamed(_CCB_MARIO_SMALL_JUMP_);
				}break;
			case enMarioLevelBig:
				{
					m_pCcbReader->getAnimationManager()->runAnimationsForSequenceNamed(_CCB_MARIO_BIG_JUMP_);
				}break;
			case enMarioLevelMax:
				{
					m_pCcbReader->getAnimationManager()->runAnimationsForSequenceNamed(_CCB_MARIO_MAX_JUMP_);
				}break;
			}

			if(getActionByTag(enTagOfActionJump)==NULL)
			{
				//强制瞬间离地
				setPositionY(getPositionY()+10.f);
				//增加跳跃运动
				CCJumpTo *pJump = CCJumpTo::create(_MARIO_BASIC_JUMP_TIME_,ccp(getPositionX(),getPositionY()-10.f),_MARIO_BASIC_JUMP_HEIGHT_,1);
				if(pJump==NULL)
				{
					CCAssert(false,"Can't Create Jump!");
					return;
				}
				//为Jump设置独立的Tag
				pJump->setTag(enTagOfActionJump);
				runAction(pJump);

				m_fMarioJumpMaxHeight = -100.f;
			}
			//将Mario状态设置为悬空
			SetMarioStatus(m_bFaceToRight?enMarioStatusOnAirRight:enMarioStatusOnAirLeft);

		}break;
	}
}

在代码中可以看到，如果马里奥已经在空中，就不能再跳跃了，只有在马里奥站立和行走时候可以跳跃。

当可以跳跃时，首先让马里奥对象播放跳跃动画，这个动画指马里奥本身的变化，比如马里奥的胳膊和腿，并不是马里奥跳跃的动作

跳跃的动作是pJump这个Action。

在runAction之前，先判断了这个action是否存在，如果这个action存在，则不需要再执行action了，这个也有避免连续两次跳跃的意思

和之前的状态判断差不多，去掉这个判断也是可以的，但是这样判断鲁棒性更好些吧。

最后根据马里奥的方向，设置马里奥的状态。

这里涉及新的知识点了，一个是执行动作runAction，一个是马里奥对象，我们分两个文章来介绍这两个知识。