/*
作者：meteor135
Email:meteor@mail.biti.edu.cn
smith_135@163.com
时间:2003.5.22
*/
#include <stdio.h>
#include <conio.h>
#include <graphics.h>
#include <bios.h>
#include <dos.h>
#define path "C://TC//BGI" //改为你自己的BGI路径
#include <stdlib.h>
#include <string.h>
#include <iostream.h>
#include <math.h>
#define Pi 3.1415926
#define RIGHT 77
#define LEFT 75
#define UP 72
#define DOWN 80
#define HIDE 'h'
#define SHOW 's'
#define ENLARGE '='
#define REDUCE 'b'
#define Alt_X '-'
enum bool { false, true };
int GetKey();
int prompt();
void window(int, int, int, int, int, int, int);
//////////////////////////////////////////////////
class Location
{
protected:
int x0, y0;
public:
Location(int x, int y){x0=x;y0=y;}
int GetX0(){return x0;}
int GetY0(){return y0;}
};
class Point:public Location
{
protected:
bool isVisible;
void Draw();
public:
void Show(){putpixel(x0,y0,getcolor());}
Point(int x, int y):Location(x,y){};
bool GetVisible(){return isVisible;}
};
//////////////////////////////////////////////////////////////
class Figure : public Point
{
protected:
int changeStep;
virtual void Draw ()=0;
public:
Figure(int x, int y):Point(x, y){changeStep=10;}
public:
virtual void Show ();
virtual void Left ();
virtual void Up ();
virtual void Down ();
virtual void Hide ();
virtual void Right ();
public:
virtual void Enlarge()=0;
virtual void Reduce ()=0;
};
void Figure::Hide()
{
unsigned color = getcolor();
isVisible = false;
setcolor(getbkcolor());
Draw();
setcolor(color);
}
void Figure::Show()
{
setcolor(getcolor());
Draw();
isVisible=true;
}
void Figure::Up()
{
Hide();
(y0 -= changeStep) ? 0 : (y0 += 480);
Draw();
}
void Figure::Down()
{
Hide();
y0 = (y0 + changeStep) % 480;
Draw();
}
void Figure::Right()
{
Hide();
x0 = (x0 + changeStep) % 640;
Draw();
}
void Figure::Left()
{
Hide();
(x0 -= changeStep) ? 0 : (x0 += 640);
Draw();
}
//////////////////////////////////////////////////////////////
class Rectangle : public Figure
{
private:
int width,height;
void Draw()
{
int left,top,right,bottom;
left = x0-width /2;
top = y0-height/2;
right = x0+width /2;
bottom = y0+height/2;
rectangle(left,top,right,bottom);
}
public:
Rectangle(int x, int y, int w, int h):Figure(x,y)
{
width = w;
height = h;
}
public:
int GetWidth (){return width ;}
int GetHeight(){return height;}
void Enlarge();
void Reduce ();
};
void Rectangle::Enlarge()
{
Hide();
width += changeStep;
height += changeStep;
Draw();
}
void Rectangle::Reduce()
{
Hide();
width -= width >0&&height>0 ? changeStep : 0;
height -= height>0&&height>0 ? changeStep : 0;
Draw();
}
//////////////////////////////////////////////////////////////
class Circle: public Figure
{
private:
int radius;
void Draw(){circle(x0, y0, radius);}
public:
Circle(int x, int y, int radius);
int GetRadius(){return radius;}
void Enlarge();
void Reduce ();
};
Circle::Circle(int x, int y, int radius):Figure(x, y)
{
this->radius = radius;
}
void Circle::Enlarge()
{
Hide();
radius += changeStep;
Draw();
}
void Circle::Reduce()
{
Hide();
radius -= radius>0 ? changeStep : 0;
Draw();
}
/////////////////////////////////////////////////////////////////////////
void main()
{
Figure *pFigure;
int choice;
while((choice=prompt())>0)
{
switch(choice)
{
case 1:
pFigure = new Circle(320, 240, 100);
break;
case 2:
pFigure = new Rectangle(200,200,300,200);
break;
default:
pFigure = new Circle(320, 240, 100);
}
char s1[10], s2[10];
//char s3[15];
int key;
int gdriver = DETECT, gmode;
initgraph(&gdriver, &gmode, path);
setbkcolor(LIGHTCYAN);
cleardevice();
window(0, 0, getmaxx(), getmaxy(), 20, BLUE, LIGHTCYAN);
settextstyle(1, 0, 1);
setcolor(RED);
outtextxy(20, 15, "Now you will see a figure and you can do something with it");
outtextxy(20, 33, "Press any key to continue!");
outtextxy(20, 57, "h:hide s:show =:enlarge b:reduce");
outtextxy(20, 75, " :right :left :up :down alt_x:quit");
setlinestyle(SOLID_LINE, 1, 3);
line(26, 88, 40, 88);
line(40, 88, 36, 84);
line(40, 88, 36, 92);
line(100, 88, 114, 88);
line(100, 88, 104, 84);
line(100, 88, 104, 92);
line(214, 82, 214, 95);
line(214, 95, 210, 91);
line(214, 95, 218, 91);
line(166, 82, 166, 95);
line(166, 82, 162, 86);
line(166, 82, 170, 86);
setcolor(RED);
rectangle(390,62,441,81);
rectangle(454,62,505,81);
//rectangle(518,62,601,81);
while((key = GetKey())!= Alt_X)
{
setfillstyle(SOLID_FILL,CYAN);
bar(391,63,440,80);
bar(455,63,504,80);
//bar(519,63,600,80);
setviewport(20, 100, 618, 458 , 1);
switch(key)
{
case RIGHT : pFigure->Right (); break;
case LEFT : pFigure->Left (); break;
case UP : pFigure->Up (); break;
case DOWN : pFigure->Down (); break;
case ENLARGE : pFigure->Enlarge(); break;
case REDUCE : pFigure->Reduce (); break;
case HIDE : pFigure->Hide (); break;
case SHOW : pFigure->Show (); break;
default : break;
}
setviewport(0, 0, 639, 479, 1);
settextstyle(2,0,5);
setcolor(RED);
sprintf(s1,"X0=%d",pFigure->GetX0());
outtextxy(392,62,s1);
sprintf(s2,"Y0=%d",pFigure->GetY0());
outtextxy(456,62,s2);
//sprintf(s3,"RADIUS=%d",pFigure->GetRadius());
//outtextxy(520,62,s3);
}
delete pFigure;
closegraph();
}
}
///////////////////////////////////////////////////////////////////////////////////////
void window(int left, int top, int right, int bottom, int width, int color1, int color2)
{
setfillstyle(SOLID_FILL, color1);
bar(left, top, right, bottom);
setcolor(color2);
rectangle(left+width, top+width*5, right-width, bottom-width);
setfillstyle(SOLID_FILL, color2);
floodfill(left+width+1, top+width*5+1, color2);
rectangle(left+2, top+2, right-2, bottom-2);
rectangle(left+width-2, top+width-2, right-width+2, bottom-width+2);
line(left+width-1, top+width*3-2, right-width+1, top+width*3-2);
line(left+width-1, top+width*5-2, right-width+1, top+width*5-2);
line(left+2, top+2, left+width-2, top+width-2);
line(right-2, top+2, right-width+2, top+width-2);
line(left+2, bottom-2, left+width-2, bottom-width+2);
line(right-2, bottom-2, right-width+2, bottom-width+2);
}
///////////////////////////////////////////////////////////
int prompt()
{
printf("This program shows a figure, it can move there and here,/n");
printf("hide and then show./n");
printf("/nPlease input your choice to show what figure you want to see:");
printf("/n1:Circle/n2:Rectangle/n0:quit/n");
int choice = 0;
cin >> choice;
return choice;
}
//////////////////////////////////////////////////////////
int GetKey()
{
int key;
while(bioskey(1) == 0);
key = bioskey(0);
key = key & 0xff ? key & 0xff : key >> 8;
return(key);
}
/////////////////////////////////////////////////////////
//The program is over here.
