学步园

上次说到，当点击一个menu时，会创建一个新的test，并调用它的runThisTest方法，比如actionTest

void ActionsTestScene::runThisTest()
{
   s_nActionIdx = -1;
   addChild(NextAction());
 
   CCDirector::sharedDirector()->replaceScene(this);
 
}

每一个test都继承自TestScene，TestScene又继承自CCScene，这里TestScene做了一下初始化工作，在构造函数里设置了屏幕为横屏并调用 CCScene::init()方法来设置场景的大小为窗口大小
，在onEnter方法里创建了一个用于返回到主界面的按钮。
 
addChild(NextAction());中NextAction（）方法创建了一个新的layer用于演示action比如ActionManual，注意这里所有的layer都继承自ActionsDemo，ActionsDemo继承自CCLayer。当我们创建ActionManual时，它会首先调用ActionsDemo::onEnter();这里对主界面进行了初始化，初始化了三个sprite、三个menu，两个label。
 
然后回到ActionManual::onEnter()，这里对上述三个sprite进行了缩放，旋转，透明，变化颜色，变化位置的操作。
 下面的都类似，只是action不同 
 

CCLayer* CreateLayer(int nIndex)
 
{
   CCLayer * pLayer = NULL;
 
    switch (nIndex)
   {
    case ACTION_MANUAL_LAYER:
       pLayer = new ActionManual(); break;
    case ACTION_MOVE_LAYER:
       pLayer = new ActionMove(); break;//移动sprite
    case ACTION_SCALE_LAYER:
       pLayer = new ActionScale(); break;//缩放sprite
    case ACTION_ROTATE_LAYER:
       pLayer = new ActionRotate(); break;//旋转sprite
   case ACTION_SKEW_LAYER:
       pLayer = new ActionSkew(); break;//倾斜sprite
   case ACTION_SKEWROTATE_LAYER:
       pLayer = new ActionSkewRotateScale(); break;//m_tamara->removeFromParentAndCleanup(true);这个方法可以从父类中移除自己。还有并发action不是得用CCSpawn吗？难道不需要？？
 
 
    case ACTION_JUMP_LAYER:
       pLayer = new ActionJump(); break;//actionTo和actionBy的区别：前者是跳到这个坐标点，后者是基于原来的位置跳多少距离，比如actionBy（ccp（0,0））就是在原地跳
    case ACTION_BEZIER_LAYER:、、
       pLayer = new ActionBezier(); break;//贝尔曲线
    case ACTION_BLINK_LAYER:
       pLayer = new ActionBlink(); break;//闪烁
    case ACTION_FADE_LAYER:
       pLayer = new ActionFade(); break;//淡入淡出
    case ACTION_TINT_LAYER:
       pLayer = new ActionTint(); break;//从一种颜色变为另一种
    case ACTION_ANIMATE_LAYER:
       pLayer = new ActionAnimate(); break;//动画
    case ACTION_SEQUENCE_LAYER:
       pLayer = new ActionSequence(); break;//按顺序执行一系列动作
    case ACTION_SEQUENCE2_LAYER:
       pLayer = new ActionSequence2(); break;//action结束可以回调某个方法
    case ACTION_SPAWN_LAYER:
       pLayer = new ActionSpawn(); break;//并发,就是多个动作同时进行
    case ACTION_REVERSE:
       pLayer = new ActionReverse(); break;//执行相反动作
    case ACTION_DELAYTIME_LAYER:
       pLayer = new ActionDelayTime(); break;// CCSequence::actions( move, CCDelayTime::actionWithDuration(2), move, NULL);
CCDelayTime::actionWithDuration(2)可以执行延时
 
    case ACTION_REPEAT_LAYER:
       pLayer = new ActionRepeat(); break;//
    case ACTION_REPEATEFOREVER_LAYER:
       pLayer = new ActionRepeatForever(); break;//
    case ACTION_ROTATETOREPEATE_LAYER:
       pLayer = new ActionRotateToRepeat(); break;
    case ACTION_ROTATEJERK_LAYER:
       pLayer = new ActionRotateJerk(); break;    
    case ACTION_CALLFUNC_LAYER:
       pLayer = new ActionCallFunc(); break;
    case ACTION_CALLFUNCND_LAYER:
       pLayer = new ActionCallFuncND(); break;
    case ACTION_REVERSESEQUENCE_LAYER:
       pLayer = new ActionReverseSequence(); break;
    case ACTION_REVERSESEQUENCE2_LAYER:
       pLayer = new ActionReverseSequence2(); break;
    case ACTION_ORBIT_LAYER:
       pLayer = new ActionOrbit(); break;//每一个CCNode对象都有一个Camera，默认的位置是锚点？所以我们看到的2D图都是规则的，当我们改变Camera的位置时，就会看到这个CCNode对象的不同形状，不知道这样理解对不对
    case ACTION_FLLOW_LAYER:
       pLayer = new ActionFollow(); break;
    default:
        break;
   }
 
    return pLayer;
}

原文地址：http://www.itmmd.com/201410/70.html 
该文章由 android开发 整理发布,转载须标明出处。。