cocos2dx-3.10 C++实现滚动数字

本文实例为大家分享了cocos2dx-3.10 C++实现滚动数字的具体代码，供大家参考，具体内容如下

NumberScroller.h

#ifndef _NUMBERSCROLLER_H_
#define _NUMBERSCROLLER_H_

#include "cocos2d.h"
USING_NS_CC;

/*
 这是一个数字滚动切换控件
 更新方向:
 1.在规定时间运动完,速度在变化
 2.能指定字体表
 3.增加新的更新算法,确保运动到指定数时候可以及时完成
 4.添加能够指定宽和高以及数字之间的间隔
*/
class NumberColumn : public Node{
private:
 NumberColumn();
public:
 static NumberColumn* create(int fontHight);
 void setNumber(int number,bool direction=true);
 void setTime(float time);
private:
 bool init(int fontHight);
 void update(float delta);
private:
 Node* m_numbers;  //当前显示节点
 int m_cur_num;   //当前显示数字
 int m_target_num;  //目标显示数组
 int m_fontHight;  //当个字体高度

 float m_time;   //切换总时间

 float update_moveSum; //几率在两个数字更新期间移动的距离
 float update_speed; //刷新一次的时间
};



class NumberScroller : public Node{
private:
 NumberScroller();
public:
 static NumberScroller* create(int length,int fontWidth,int fontHeight,int fontSpacing);
 void setTime(float time);
 void setNumber(int number);
 int getNumber();
private:
 bool init(int length, int fontWidth, int fontHeight, int fontSpacing);
private:
 Vector<NumberColumn*> m_columns; //存储一共的列数
 int m_cur_num;      //当前显示数字
 int m_length;      //列数
 int m_time;       //切换总时间
 int m_fontWidth;     //字体宽度
 int m_fontHeight;     //字体高度
 int m_fontSpacing;     //字体间隔
 Node* m_visibleNode;    //当前可视节点
};
#endif

NumberScroller.cpp

#include "NumberScroller.h"

NumberColumn::NumberColumn():
 m_cur_num(0),
 m_target_num(0),
 m_time(1.0f),
 update_moveSum(0),
 update_speed(0)
{

}

NumberColumn* NumberColumn::create(int fontHight){
 NumberColumn* ret = new NumberColumn();
 if (ret && ret->init(fontHight)){
  ret->autorelease();
  return ret;
 }
 CC_SAFE_DELETE(ret);
 return nullptr;
}

bool NumberColumn::init(int fontHight){
 if(!Node::init()) return false;
 m_numbers = Node::create();
 this->addChild(m_numbers);
 m_fontHight = fontHight;

 this->scheduleUpdate();

 //初始化一列0-9 共十个数字
 for(int i=0;i<10;i++){
  char str[2];
  str[0] = i + '0';
  str[1] = '\0';

  auto temp = Label::createWithBMFont("fonts/test.fnt", str);
  temp->setAnchorPoint(Point(0,0));
  temp->setPosition(Point(0, i * fontHight));
  m_numbers->addChild(temp);
 }
 //为了兼容不同方向的偏转
 char str[2];
 str[0]='0';
 str[1]='\0'; //添加字符串结束符
 Label* temp = Label::createWithBMFont("fonts/test.fnt", str);
 temp->setAnchorPoint(Point(0,0));
 temp->setPosition(Point(0, 10 * fontHight));
 m_numbers->addChild(temp);

 return true;
}
void NumberColumn::setNumber(int number,bool direction){
 m_target_num = number;
 int delta = m_target_num - m_cur_num;   //计算数字间隔
 update_speed = (delta * m_fontHight / m_time); //v = s / t
}

void NumberColumn::setTime(float time){
 m_time = time;
}

void NumberColumn::update(float d){
 if(m_cur_num != m_target_num){ //如果当前显示的数字不等于目标数字，即要开始滚动
  float dis = update_speed * d; //每次调用update函数需要滚动的距离等于update_speed 乘以 d （update_speed在setNumber函数中已经算出） 
  m_numbers->setPositionY(m_numbers->getPositionY() - dis);//每次使整条向下移动dis距离
  update_moveSum += dis;//update_moveSum 用于保存现在到底移动了多少距离
  if (update_moveSum >= m_fontHight){ //如果现在已经移动了一个字大小的距离
   //每移动一次累加1
   m_cur_num++;
   //对10求余是为了在每次达到10后从新开始新循环
   m_numbers->setPositionY(- (m_cur_num % 10) * m_fontHight); //负数表示向下移,标准对齐位置
   update_moveSum = 0; 
  }
 }
}

/*
********************************************************************************************************************************************
********************************************************************************************************************************************
*/

NumberScroller::NumberScroller():
 m_cur_num(0),
 m_length(0),
 m_time(1.0f)
{

}

NumberScroller* NumberScroller::create(int length, int fontWidth, int fontHeight, int fontSpacing){
 NumberScroller* ret = new NumberScroller();
 if (ret && ret->init(length, fontWidth, fontHeight,fontSpacing)){
  ret->autorelease();
  return ret;
 }
 CC_SAFE_DELETE(ret);
 return nullptr;
}

bool NumberScroller::init(int length, int fontWidth, int fontHeight, int fontSpacing){
 if(!Node::init()) return false;
 m_length = length;
 m_fontWidth = fontWidth;
 m_fontHeight = fontHeight;
 m_fontSpacing = fontSpacing;
 m_visibleNode = Node::create();

 //排好length行数字
 //该demo下为左对齐
 for(int i=0;i<length;i++){
  NumberColumn* column = NumberColumn::create(fontHeight);
  m_columns.pushBack(column);
  column->setAnchorPoint(Point(0,0));  //锚点设置为0是为了后面设置遮罩层
  column->setPosition(i * (fontWidth + fontSpacing), 0);
  column->setTime(m_time);  //设置默认运动时间1S
  m_visibleNode->addChild(column);
 }
 /*设置遮罩层*/
 ClippingNode* cliper = ClippingNode::create();
 //创建模板
 DrawNode* drawNode = DrawNode::create();
 Point points[] = {
  Point(getPosition()),
  Point(getPositionX(),getPositionY() + m_fontHeight),
  Point(getPositionX() + m_length * m_fontHeight, getPositionY() + m_fontHeight), 
  Point(getPositionX() + m_length * m_fontHeight, getPositionY()) 
 };
 drawNode->drawPolygon(points,4,Color4F(0,0,0,1),0,Color4F(0,0,0,1));
 //设置模板
 cliper->setStencil(drawNode);
 cliper->addChild(m_visibleNode);
 this->addChild(cliper);
 //不添加遮罩层的方法
 //this->addChild(m_visibleNode);
}

void NumberScroller::setNumber(int number){
 if(number > m_cur_num){
  m_cur_num = number;

  for(int i=0;i<m_length;i++){
   m_columns.at(m_length - i -1)->setNumber(number);
   number /= 10;
  }  
 }
}

int NumberScroller::getNumber(){
 return m_cur_num;
}

//对外开放设置时间的接口
void NumberScroller::setTime(float time){
 m_time = time;
 for(int i=0;i<m_length;i++){
  m_columns.at(i)->setTime(time);
 } 
}

使用方法

auto numberScroller = NumberScroller::create(1,15,33,10);//这个字体宽度根据fnt 文件表的相关参数计算
 numberScroller->setPosition(Director::getInstance()->getVisibleSize().width / 2, Director::getInstance()->getVisibleSize().height / 2);

 this->addChild(numberScroller);
 scheduleUpdate();
 Director::getInstance()->getScheduler()->schedule([=](float){
   CountNum = CountNum + 1;
   numberScroller->setNumber(CountNum);
 }, this, 1.0f, false, "countDown");

实现效果：

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