[cocos2dx 3.x]Label类数字变化动作

之前写了个2.14版本的动作变化，见 http://www.cnblogs.com/creeper/p/3531304.html

3.x版本变化了很多，但是核心思想还是没有变化，所以对应3.x版本的改了一下放上来

有空的话把tolua的转换方法也放上来吧:)

 1 #ifndef __MISC_NODE_CCNUMBER_CHANGE_H__

 2 #define __MISC_NODE_CCNUMBER_CHANGE_H__

 3 

 4 #include <vector>

 5 

 6 #include "2d/CCAction.h"

 7 #include "2d/CCAnimation.h"

 8 #include "2d/CCActionInterval.h"

 9 #include "base/CCProtocols.h"

10 #include "base/CCVector.h"

11 

12 //NS_CC_BEGIN

13 USING_NS_CC;

14 class Node;

15 class SpriteFrame;

16 class EventCustom;

17 

18 

19 class NumberChange : public ActionInterval

20 {

21 public:

22 

23     static NumberChange* create(float duration, int fromNum, int toNum);

24 

25     virtual NumberChange* clone() const override;

26     virtual NumberChange* reverse(void) const  override;

27     virtual void startWithTarget(cocos2d::Node *target) override;

28     virtual void update(float time) override;

29     

30 CC_CONSTRUCTOR_ACCESS:

31     NumberChange();

32     virtual ~NumberChange();

33 

34     /** initializes the action */

35     bool initWithDuration(float duration, int fromNum, int toNum);

36 

37 protected:

38     int _fromNum;

39     int _toNum;

40 

41 private:

42     CC_DISALLOW_COPY_AND_ASSIGN(NumberChange);

43 };

44 

45 //NS_CC_END

46 

47 #endif //__MISC_NODE_CCNUMBER_CHANGE_H__

 

 1 #include "2d/CCActionInterval.h"

 2 

 3 #include <stdarg.h>

 4 

 5 #include "2d/CCSprite.h"

 6 #include "2d/CCNode.h"

 7 #include "2d/CCSpriteFrame.h"

 8 #include "2d/CCActionInstant.h"

 9 #include "base/CCDirector.h"

10 #include "base/CCEventCustom.h"

11 #include "base/CCEventDispatcher.h"

12 #include "platform/CCStdC.h"

13 #include "deprecated/CCString.h"

14 #include "NumberChange.h"

15 

16 USING_NS_CC;

17 //NS_CC_BEGIN

18 NumberChange::NumberChange(){

19 }

20 

21 NumberChange::~NumberChange(){

22 }

23 

24 NumberChange* NumberChange::create(float duration, int fromNum, int toNum)

25 {

26     NumberChange *ret = new (std::nothrow) NumberChange();

27     ret->initWithDuration(duration, fromNum, toNum);

28     ret->autorelease();

29 

30     return ret;

31 }

32 

33 

34 bool NumberChange::initWithDuration(float duration, int fromNum, int toNum)

35 {

36     if (ActionInterval::initWithDuration(duration))

37     {

38         _fromNum = fromNum;

39         _toNum = toNum;

40         return true;

41     }

42 

43     return false;

44 }

45 

46 NumberChange* NumberChange::clone() const

47 {

48     // no copy constructor

49     auto a = new (std::nothrow) NumberChange();

50     a->initWithDuration(_duration, _fromNum, _toNum);

51     a->autorelease();

52     return a;

53 }

54 

55 void NumberChange::startWithTarget(cocos2d::Node *target)

56 {

57     ActionInterval::startWithTarget(target);

58     LabelProtocol *pLabel = dynamic_cast<LabelProtocol*>(target);

59     if (pLabel)

60     {

61         std::string numStr = cocos2d::StringUtils::format("%i", _fromNum);

62         pLabel->setString(numStr.c_str());

63     }

64 }

65 

66 NumberChange* NumberChange::reverse() const

67 {

68     return NumberChange::create(_duration, _toNum, _fromNum);

69 }

70 

71 

72 void NumberChange::update(float t)

73 {

74     LabelProtocol *pLabel = dynamic_cast<LabelProtocol*>(_target);

75     if (pLabel)

76     {

77         int tempNum = (_toNum - _fromNum) * t;

78         int num = _fromNum + tempNum;

79         std::string numStr = cocos2d::StringUtils::format("%i", num);

80         pLabel->setString(numStr.c_str());

81     }

82 }

83 

84 //NS_CC_END