Переделать программу так что бы можно было нарисовать линиями

#include<iostream.h>
#include<graphics.h>
#include<conio.h>
 
class Object{
public:
Object();
int x,y,mx, my;
void Show(){
line(x,y,x+mx,y+my);
}
Object* Next;
};
 
Object::Object(){Next = NULL;}
 
void main(){
int gdriver = DETECT, gmode;
initgraph(&gdriver, &gmode, "..\\BGI");
Object *p;            //point
p->x = getmaxx()/2;
p->y = getmaxy()/2;
p->mx = 0;
p->my = 0;
p->Show();
p = new Object();
getch();
 
Object *str=p->Next;                 //straight
str->x = getmaxx()/2;
str->y = getmaxy()/2;
str->mx = 100;
str->my = 0;
str->Show();
str->Next = new Object();
getch();
 
Object *ang=str->Next;                 //angle
ang->x = getmaxx()/2;
ang->y = getmaxy()/2;
ang->mx = 0;
ang->my = 100;
ang->Show();
ang->Next = new Object();
getch();
 
Object *tr=ang->Next;                 //triangle
tr->x = getmaxx()/2;
tr->y = getmaxy()/2+100;
tr->mx = 100;
tr->my = -100;
tr->Show();
tr->Next = new Object();
getch();
 
Object *temp;
char key;
 
while(key != 'q'){
key = getch();
if (key == '1')
temp = p;
if (key == '2')
temp = str;
if (key == '3')
temp = ang;
if (key == '4')
temp = tr;
 
if (key == 'd')
temp->x +=10;
if (key == 'a')
temp->x -=10;
if (key == 'w')
temp->y -=10;
if (key == 's')
temp->y +=10;
temp->Show();}
}