From: http://cstriker1407.info/blog/cocos2dx-study-notes-custom-actions-realization-of-circular-motion/
最近在翻帖子的时候发现很多大牛都自己实现自定义动作,而不是通过各种动作进行组合,正好最近需要一个圆周运动的效果,就自己写了一个自定义的动作,这里备注下大致的实现思路。
备注:
该动作并未实际应用在游戏中,可能有bug。
数学复习:
截图来自【http://202.113.29.3/nankaisource/mathhands/Elementary%20mathematics/0103/010301/01030101.htm】
实现方式:
可参考这篇文章来实现:【http://www.jb51.cc/article/p-fdrufoeg-bcr.html】
作者自己也写了一个功能增强版的圆周运动,可以实现螺旋线式的圆周运动。代码比较简单,就不在细说了。
自己的实现:
CircleMoveAct.h:
#ifndef __CIRCLE_MOVE_ACT_H__ |
#define __CIRCLE_MOVE_ACT_H__
#include "cocos2d.h"
class
CircleMoveAct :
public
cocos2d::CCActionInterval
{
public
:
bool
initWithDuration(
float
duration,
const
cocos2d::CCPoint& center,
scaleDiff,255)!important; border:0px!important; white-space:normal; margin:0px!important; outline:0px!important; text-align:left!important; float:none!important; vertical-align:baseline!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; font-weight:normal!important; font-style:normal!important; min-height:inherit!important">angle);
virtual
cocos2d::CCObject* copyWithZone(cocos2d::CCZone* pZone);
virtual
void
startWithTarget(cocos2d::CCNode *pTarget);
update(
float
time
);
static
@H_301_240@m_duration;
CircleMoveAct* create(
scale,61)!important; border:0px!important; white-space:normal; margin:0px!important; outline:0px!important; text-align:left!important; float:none!important; vertical-align:baseline!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; font-weight:bold!important; font-style:normal!important; min-height:inherit!important">protected
:
cocos2d::CCPoint m_center;
m_scaleDiff;
@H_301_240@m_currScale;
m_angle;
@H_301_240@m_anglePreFrame;