line.cpp

c compiler with added projects...

#include<iostream.h>
#include<graphics.h>
#include<conio.h>
#include<dos.h>
#include<math.h>

//////////////mouse

int chk_mouse(void)
{
	REGS r;
	r.x.ax=0x0000;
	int86(0x33,&r,&r);
	return r.x.ax;
}
						   //mouse function
void show_mouse(void)
{
REGS r;
r.x.ax=0x0001;
int86(0x33,&r,&r);
}
						   //mouse function
void hide_mouse(void)
{
REGS r;
r.x.ax=0x0002;
int86(0x33,&r,&r);
}
						   //mouse function
void get_mouse(int *x1,int *y1)
{
REGS r;
r.x.ax=0x0003;
int86(0x33,&r,&r);
*x1=r.x.cx;
*y1=r.x.dx;
}
						   //mouse function
int mouse_pressed(int btn_no)
{
REGS r;
r.x.ax=0x0005;
r.x.bx=btn_no;
int86(0x33,&r,&r);
return r.x.bx;
}
						   //mouse function
int mouse_released(int btn_no)
{
REGS r;
r.x.ax=0x0006;
r.x.bx=btn_no;
int86(0x33,&r,&r);
return r.x.bx;
}
//////////////////////

void lineBres(int xa,int ya,int xb,int yb)

{
	int dx=abs(xa-xb),dy=abs(ya-yb);
	int p=2*dy-dx;
	int twoDy=2*dy,twoDyDx=2*(dy-dx);
	int x,y,xEnd;

	if(xa>xb)
	{
		x=xb; y=yb; xEnd=xa;
	}
	else
	{
		x=xa;	y=ya;	xEnd=xb;
	}
	putpixel(x,y,1);

	while(x<xEnd)
	 {	x++;
		if(p<0)
		p+=twoDy;
		else
		{
			y++;
			p+=twoDyDx;
		}
		putpixel(x,y,1);
	}

}

void main()
{
int a=DETECT,b;
int x1,y1,x2,y2;
initgraph(&a,&b,"c:\\tc\\bgi");
lineBres(100,100,500,50);
chk_mouse();
show_mouse();




	while(!kbhit())


	{

	if(mouse_pressed(0))
	  { get_mouse(&x1,&y1);
		while(!mouse_released(0))
		get_mouse(&x2,&y2);
	  }

lineBres(x1,y1,x2,y2);

}
}