PR6 FINAL

#include <stdlib.h>
#include <time.h>
#include <grxkeys.h>
#include <grx20.h>

struct TPoint{
 int x,y;
 int vx,vy;
 int color;
 TPoint(int ix,int iy,int icolor);
 virtual ~TPoint();
 virtual void Draw(int icolor);
 void Show();
 virtual void Hide();
 void MoveXY(int ix, int iy);
};

struct TBox: public TPoint{
 int w,h;
 TBox(int ix,int iy,int icolor,int iw,int ih);
 virtual ~TBox();
 virtual void Draw(int icolor);
};

struct TCircle: public TPoint{
 int r;
 TCircle(int ix,int iy,int icolor,int ir);
 virtual ~TCircle();
 virtual void Draw(int icolor);
};

struct TM: public TPoint{
 int size;
 TM(int ix,int iy,int icolor,int isize);
 virtual ~TM();
 virtual void Hide();
 virtual void Draw(int icolor);
};

TPoint::TPoint(int ix,int iy,int icolor)
{
 vx=rand()%9-3;
 vy=rand()%9-3;
 x=ix; y=iy;
 color=icolor;
}

TPoint::~TPoint()
{
 Hide();
}

void TPoint::Draw(int icolor)
{
 GrFilledCircle(x,y,3,icolor);
}

void TPoint::Show()
{
 Draw(color);
}

void TPoint::Hide()
{
 Draw(0);
}

void TPoint::MoveXY(int ix,int iy)
{
 Hide();
 x=ix; y=iy;
 if(x+3>GrMaxX())
    vx=-vx;

 if(x-3<0)
    vx=-vx;
 if(y+3>GrMaxY())
    vy=-vy;
 if(y-3<0)
    vy=-vy;
 Show();
}

TBox::TBox(int ix,int iy,int icolor,int iw,int ih):
 TPoint(ix,iy,icolor)
{
 w=iw; h=ih;
}

TBox::~TBox()
{
 Hide();
}

void TBox::Draw(int icolor)
{
 GrFilledBox(x-w/2,y-h/2,x+(w-w/2),y+(h-h/2),icolor);
}

TCircle::TCircle(int ix,int iy,int icolor,int ir):
 TPoint(ix,iy,icolor)
{
 r=ir;
}

TCircle::~TCircle()
{
 Hide();
}

void TCircle::Draw(int icolor)
{
 GrFilledCircle(x,y,r,icolor);;
}

TM::TM(int ix,int iy,int icolor,int isize):
 TPoint(ix,iy,icolor)
{
 size=isize;
}
void TM::Hide()
{
GrLine(x,y,x+0.5*size*4,y-size*4,0);
GrLine(x+0.5*size*4,y-size*4,x+size*4,y,0);
GrLine(x+1,y,x+0.5*size*4+1,y-size*4,0);
GrLine(x+1+0.5*size*4,y-size*4,x+size*4+1,y,0);
GrLine(x+0.3*size*4,y-0.5*size*4,x+0.8*size*4,y-0.5*size*4,0);

GrLine(x+size*5,y-size*4,x+size*5,y,0);
GrLine(x+size*5+1,y-size*4,x+size*5+1,y,0);
GrLine(x+size*8,y-size*4,x+size*8,y,0);
GrLine(x+size*8+1,y-size*4,x+size*8+1,y,0);
GrLine(x+size*5,y-0.5*size*4,x+size*8,y-0.5*size*4,0);
GrLine(x+size*5,y-0.5*size*4+1,x+size*8,y-0.5*size*4+1,0);
}

TM::~TM()
{
 Hide();
}

void TM::Draw(int icolor)
{

GrLine(x,y,x+0.5*size*4,y-size*4,color);
GrLine(x+0.5*size*4,y-size*4,x+size*4,y,color);
GrLine(x+1,y,x+0.5*size*4+1,y-size*4,color);
GrLine(x+1+0.5*size*4,y-size*4,x+size*4+1,y,color);
GrLine(x+0.3*size*4,y-0.5*size*4,x+0.8*size*4,y-0.5*size*4,color);

GrLine(x+size*5,y-size*4,x+size*5,y,color);
GrLine(x+size*5+1,y-size*4,x+size*5+1,y,color);
GrLine(x+size*8,y-size*4,x+size*8,y,color);
GrLine(x+size*8+1,y-size*4,x+size*8+1,y,color);
GrLine(x+size*5,y-0.5*size*4,x+size*8,y-0.5*size*4,color);
GrLine(x+size*5,y-0.5*size*4+1,x+size*8,y-0.5*size*4+1,color);

}

#define N 70
main()
{
 GrSetMode(GR_default_graphics);
 TPoint *obj[N];
 srand(time(0));
 int i;
 for(i=1;i<N;i++){
    int flag = rand()%3;
    switch(flag){
        case 0: obj[i]=new TPoint(GrMaxX()/2,GrMaxY()/2,rand()%15+1); break;
        case 1: obj[i]=new TBox(GrMaxX()/2,GrMaxY()/2, rand()%15+1, rand()%20+10, rand()%20+10); break;
        case 2: obj[i]=new TCircle(GrMaxX()/2,GrMaxY()/2,rand()%15+1, rand()%20+10);
    }
    obj[0]=new TM(GrMaxX()/2,GrMaxY()/2, rand()%15+1, rand()%20+10);
    obj[i]->Show();
 }
 GrKeyType key;
 do{
    while (!GrKeyPressed()){
        GrSleep(20);
        for(i=0;i<N;i++){
            obj[i]->MoveXY(obj[i]->x+obj[i]->vx,obj[i]->y+obj[i]->vy);
            if(rand()%50==30){
                obj[i]->vx=rand()%7-3;
                obj[i]->vy=rand()%7-3;
            }
        }
    }
 key=GrKeyRead();
 }while(key!=GrKey_Escape);

 for(i=0;i<N;i++){
    delete obj[i];
 }

}