lab5.cpp

#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include <graphics.h>
#include <dos.h>
class gr_init
{
public:
    gr_init(int driver=0)
    {
        *gd=driver;
        initgraph(gd,gm,"c:\\TurboC3\\BGI");
        if (graphresult() !=0 ) {printf("Error!'");abort();}
    }
    ~gr_init()
    {
        closegraph();
    }
private:
    int *gd,*gm;
};
class gr_obj
{
public:
    gr_obj(int col=7) { _color=col; }
    virtual void draw()=0;
    int color() { return _color; }
    void show() { setcolor(color()); draw(); }
    void hide()
    {
        cback=getcolor(); 
        setcolor(getbkcolor()); 
        draw(); 
        setcolor(color());
    }
private:
    int _color,cback;
};
 
class krug: public gr_obj
{
public:
    krug(int xc=0, int yc=0, int rad=0, int col=7): gr_obj(col)
    {
        r=rad; 
        show(); 
        setpx(xc); 
        setpy(yc); 
    }
    ~krug() { hide(); }
    int getpx() { return x; }
    int getpy() { return y; }
    int getrad() { return r; }
    void setpx(int px) { x=px; }
    void setpy(int py) { y=py; }
    void setrad(int rad) { r=rad; }
    void draw(){ circle(getpx(),getpy(),getrad()); }
 
private:
    int r,x,y;
 
};
void main()
{
gr_init gr(0);
krug kr(180,230,70);
krug kr2(420,230,70);
 
 for (int i = 1; i < 30; i++)
 {
     if (i%2 == 0)
     {
       kr.hide();
     }
     else
     {
       kr.show();
     }
     if (i%2 != 0 && i != 29)
     {
       kr2.hide();
     }
     else
     {
       kr2.show();
     }
     delay(70);
 }
getch();
}