CCCardinalSplineBy 样条曲线动作

欢迎各位童鞋转载，转载请注明出处：http://blog.youkuaiyun.com/song_hui_xiang 作者新浪微博：http://weibo.com/u/3168848533 作者腾讯微博：http://t.qq.com/song_huixiang CCCardinalSplineBy概念 这个类是样条曲线动作，其创建函数CCCardinalSplineBy::create(float duration, cocos2d::CCPointArray *points, float tension)；中duration是时间间隔，points是控制点列表，tension是松紧程度。tension==1时，样条线是分段直线。tension<1向外松弛弯曲，tension>1向内缩紧弯曲。By动作是以当前坐标为新坐标原点。 CCCardinalSplineBy示例–为同一组控制点实现不同的移动路径     CCSize s = CCDirector::sharedDirector()->getWinSize();     CCPointArray *array = CCPointArray::create(20);     array->addControlPoint(ccp(0, 0));     array->addControlPoint(ccp(s.width/2-30, 0));     array->addControlPoint(ccp(s.width/2-30, s.height-80));     array->addControlPoint(ccp(0, s.height-80));     array->addControlPoint(ccp(0, 0));         //         // sprite 1 (By)         //         // Spline with no tension (tension==0)         //     CCCardinalSplineBy *action = CCCardinalSplineBy::create(3, array, 0);     CCActionInterval *reverse = action->reverse();     CCFiniteTimeAction *seq = CCSequence::create(action, reverse, NULL);     m_tamara->setPosition(ccp(50, 50));     m_tamara->runAction(seq);         //         // sprite 2 (By)         //         // Spline with high tension (tension==1)         //     CCCardinalSplineBy *action2 = CCCardinalSplineBy::create(3, array, 1);     CCActionInterval *reverse2 = action2->reverse();     CCFiniteTimeAction *seq2 = CCSequence::create(action2, reverse2, NULL);     m_kathia->setPosition(ccp(s.width/2, 50));     m_kathia->runAction(seq2); 由于By动作是以当前坐标为新坐标原点，所以在draw函数里设置openGL的原点位置     // move to 50,50 since the "by" path will start at 50,50         kmGLPushMatrix();         kmGLTranslatef(50, 50, 0);         ccDrawCardinalSpline(m_pArray, 0, 100);         kmGLPopMatrix();         CCSize s = CCDirector::sharedDirector()->getWinSize();         kmGLPushMatrix();         kmGLTranslatef(s.width/2, 50, 0);         ccDrawCardinalSpline(m_pArray, 1, 100);         kmGLPopMatrix(); 复制代码 效果图如下：