easy教学.zip

//模拟Windows操作系统计算器基本计算功能的简单计算器软件。@版本1.0 //本软件基于C++下的easyx图形库的实现，为2018级计算机科学与技术专业学生《面向对象程序设计实训（课程设计）》项目 //*********************************************************************************************************** //作者：南昌师范学院数学与计算机科学系 彭正文 QQ：173780842 //*********************************************************************************************************** //此软件仅为学习C++面向对象知识及easyx图形库的爱好者参考使用 //@版权所有 1.0版本 //软件说明：软件中使用easyx绘制了按钮（按钮类对象）和编辑框（编辑框类对象），另外设计了算术表达式类，该软件只实现简单加减乘除功能 //同时存在不少bug #include <graphics.h> #include <math.h> #include <conio.h> //异常类 class Except//计算过程中可能产生的异常 {char*exc_info;//异常信息 public: Except(char *str) { exc_info=new char[strlen(str)+1]; strcpy(exc_info,str); } Except(Except&e) { exc_info=new char[strlen(e.exc_info)+1]; strcpy(exc_info,e.exc_info); } char *GetInfo() { return exc_info; } ~Except() { delete []exc_info; } }; //算式类 class Formula//算术表达式类 {bool used; double num1,num2;//两个操作数,num1 op num2 char op; //操作符 double result; //运算结果 public: Formula()//无参构造函数 { num1=num2=0;used=false; } Formula(double n1,char oper,double n2) { num1=n1,num2=n2; op=oper; } void SetNum1(double n) //设定第一操作数 { num1=n; } void SetNum2(double n)//设定第二操作数 { num2=n; } void SetOP(char op)//设定操作符 { this->op=op; used=false;//操作符未计算过 } void SetUsed(bool b) { used=b; } double GetResult()//计算算式的结果 { used=true; switch(op) { case '+': result=num1+num2; break; case '-': result=num1-num2; break; case '*': result=num1*num2; break; case '/': if(num2==0)throw Except("错误：除数不能为0！");//除数为0时抛出异常 else result=num1/num2; break; case '%': if(num2==0)throw Except("错误：除数不能为0！");//除数为0时抛出异常 else result=(long)num1%(long)num2; break; case '√': if(num1<0)throw Except("错误：复数无法求平方根！");//除数为0时抛出异常 result=sqrt(num1); break; case '±': num1=-num1; result=-num1; break; } return result; } bool OperUsed() { return used; } }; //简单普通窗口类 class CWnd {protected : int length,hight; COLORREF bkcol; IMAGE*img; int posx,posy; public: CWnd() {} CWnd(int l,int h,COLORREF cbk=RGB(100,100,100)):length(l),hight(h),bkcol(cbk) { img=new IMAGE(length,hight); } void Draw(int l,int r) {posx=l;posy=r; IMAGE *iold=GetWorkingImage(); SetWorkingImage(img); setfillcolor(bkcol); fillrectangle(0,0,length,hight); SetWorkingImage(iold); putimage(posx, posy, img); } ~CWnd() {if(img)delete img;} bool mouse_in(int x,int y) { if((x>posx&&x<posx+length)&&(y>posy&&y<posy+hight))return true; else return false; } }; //按钮类 class CButton:public CWnd { char *str; public : CButton() {str=0;} void SetSize(int length,int hight) {this->length=length;this->hight=hight; img=new IMAGE(length,hight); } void SetPos(int x,int y) {posx=x;posy=y; } CButton(int l,int h,COLORREF c):CWnd(l,h,c) {str=new char[20]; strcpy(str,"按钮名称"); } void SetWnd(IMAGE*image=NULL) {if(image){delete image;this->img=image;} else img=GetWorkingImage(); } void SetBnText(char* str) { if(this->str) delete[]this->str; this->str=new char[strlen(str)+1]; strcpy(this->str,str); } void SetBkColor(COLORREF col) { bkcol=col; } void Draw(int l,int r) { posx=l;posy=r; IMAGE *iold=GetWorkingImage(); SetWorkingImage(img); setfillcolor(bkcol); fillrectangle(0,0,length,hight); fillrectangle(1,1,length-1,hight-1); fillrectangle(2,2,length-2,hight-2); RECT rect={length/6,hight/4,length,hight}; setbkmode(TRANSPARENT); drawtext(str,&rect,DT_CENTER); SetWorkingImage(iold); putimage(posx, posy, img); } void Click_Down() { IMAGE *iold=GetWorkingImage(); SetWorkingImage(img); setfillcolor(RGB(GetRValue(bkcol)+30,GetGValue(bkcol)+30,GetBValue(bkcol)+30)); fillrectangle(0,0,length,hight); fillrectangle(1,1,length-1,hight-1); fillrectangle(2,2,length-2,hight-2); RECT rect={length/6,hight/4,length,hight}; setbkmode(TRANSPARENT); drawtext(str,&rect,DT_CENTER); SetWorkingImage(iold); putimage(posx, posy, img); } void Click_Up() { IMAGE *iold=GetWorkingImage(); SetWorkingImage(img); setfillcolor(bkcol); fillrectangle(0,0,length,hight); fillrectangle(1,1,length-1,hight-1); fillrectangle(2,2,length-2,hight-2); RECT rect={length/6,hight/4,length,hight}; setbkmode(TRANSPARENT); drawtext(str,&rect,DT_CENTER); SetWorkingImage(iold); putimage(posx, posy, img); } char*GetText() {return str;} ~CButton() { if(str)delete []str; } }; //编辑区类 class CEdit:public CWnd { char*str; public: CEdit(int l,int h,COLORREF bkcol=RGB(100,255,255)):CWnd(l,h,bkcol) {str=0;} void Draw(int l,int r) {posx=l;posy=r; IMAGE *iold=GetWorkingImage(); SetWorkingImage(img); setfillcolor(bkcol); settextcolor(RGB(255,0,255)); fillrectangle(0,0,length,hight); RECT rect={length/6,hight/4,length,hight}; setbkmode(TRANSPARENT); drawtext(str,&rect,DT_RIGHT); SetWorkingImage(iold); putimage(posx, posy, img); } void SetPos(int x,int y) {posx=x;posy=y; } void SetEditText(char* str) { if(this->str) delete[]this->str; this->str=new char[strlen(str)+1]; strcpy(this->str,str); } ~CEdit() {if(str)delete [] str;} }; char* strinfo[28]={"MC","MR","MS","M+","M-", "←","CE","C","±","√","7","8","9","/","%", "4","5","6","*","1/x","1","2","3","-","=","0", ".","+"}; //计算器类 class calculator {char **btinfo;//按钮上信息 CButton*pbt;//按钮 CEdit*edit;//编辑区 char*str;//按钮按下字符串 double result; int beginx; int beginy; int sizex,sizey; Formula form; bool first;//新的数字开始，初始为true bool b;//按数字时是否要重新开始 public: calculator(int bx,int by,int szx,int szy, char**str=strinfo) {btinfo=str;pbt=new CButton[28]; beginx=bx;beginy=by,sizex=szx;sizey=szy; edit=new CEdit(sizex*5,sizey); edit->SetPos(beginx+20,beginy-50); this->str=new char[4]; strcpy(this->str,"0"); first=true; b=true; } void Draw(IMAGE*img=NULL) { for(int i=0;i<28;i++) { pbt[i].SetBnText(strinfo[i]); pbt[i].SetSize(sizex,sizey); if(i==24)pbt[i].SetSize(sizex,sizey*2); if(i==25)pbt[i].SetSize(sizex*2,sizey); pbt[i].SetBkColor(RGB(150,100,150)); if(i>=26)pbt[i].Draw(beginx+((i+1)%5)*sizex,beginy+i/5*sizey); else pbt[i].Draw(beginx+(i%5)*sizex,beginy+i/5*sizey); } edit->SetEditText(str); edit->Draw(beginx,beginy-50); } bool Find(char ch)//检查某个字符是否在str中 {int i=0; while(str[i]!=ch&&str[i])i++; if(i<strlen(str))return 1; else return 0; } char* doubleToStr(double x)//双精度数转换为字符串 {char*str=new char[50]; memset(str,0,50);//清空字符串空间 gcvt(x,17,str); return str; } void Process(char*ch)//处理按钮单击，分按钮处理 {try{int x=strlen(ch); switch(strlen(ch))//单字符按钮处理 { case 1: if(ch[0]=='C') {//按钮“C”清0处理 if(str)delete[]str; str=new char[2]; strcpy(str,"0");form.SetNum1(0); break; }; if(ch[0]>='0'&&ch[0]<='9')// 数字按钮“0”——“9”的处理 { if(!form.OperUsed()){ //delete[]str; str=new char[strlen(ch)+1]; strcpy(str,ch); form.SetUsed(true);} else{ if(!atoi(str)&&!Find('.')){ str=new char[strlen(ch)+1]; strcpy(str,ch); } else