dda.bak

c compiler with added projects...

#define ROUND(a)((int)(a+0.5))
#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 DDA(int xa,int ya,int xb,int yb)

{
	int dx=abs(xa-xb),dy=abs(ya-yb),steps,k;
	float xinc,yinc,x=xa,y=ya;

	if(dx>dy)  steps=dx;
	else steps=dy;
	xinc=dx/(float)steps ;
	yinc=dy/(float)steps ;

	putpixel(ROUND(x),ROUND(y),2);
	for(k=0;k<steps;k++)
	{
	x+=xinc;
	y+=yinc;
	putpixel(ROUND(x),ROUND(y),2);
}

}

void main()
{
int a=DETECT,b;
int x1,y1,x2,y2,ax1,ay1,ax2,ay2;
initgraph(&a,&b,"c:\\tc\\bgi");

DDA(10,10,100,100);

chk_mouse();
show_mouse();
	while(!kbhit())

	{

	if(mouse_pressed(0))
	   get_mouse(&x1,&y1);

	if(mouse_released(0))
	   get_mouse(&x2,&y2);

	DDA(x1,y1,x2,y2);


	}
}