zline.h File Reference

Go to the source code of this file.

Macros
#define	RGB(x)
#define	RGBPIXEL   *pp = color
#define	ZZ(x)
#define	PUTPIXEL()   RGBPIXEL
#define	DRAWLINE(dx, dy, inc_1, inc_2)

Functions
	if (p1->y > p2->y||(p1->y==p2->y &&p1->x > p2->x))
	if (dx==0 &&dy==0)
else	if (dx > 0)
	if (dx >=dy)

Variables
register int	a
register PIXEL *	pp = (PIXEL *) ((char *) zb->pbuf + zb->linesize * p1->y + p1->x * PSZB)
	sx = zb->xsize
	dx = p2->x - p1->x
	dy = p2->y - p1->y
	else

Macro Definition Documentation

DRAWLINE

#define DRAWLINE	(		dx,
			dy,
			inc_1,
			inc_2
	)

Value:

    n=dx;\
    ZZ(zinc=(p2->z-p1->z)/n);\
    RGB(rinc=((p2->r-p1->r) << 8)/n;\
        ginc=((p2->g-p1->g) << 8)/n;\
        binc=((p2->b-p1->b) << 8)/n);\
    a=2*dy-dx;\
    dy=2*dy;\
    dx=2*dx-dy;\
    pp_inc_1 = (inc_1) * PSZB;\
    pp_inc_2 = (inc_2) * PSZB;\
    do {\
        PUTPIXEL();\
        ZZ(z+=zinc);\
        RGB(r+=rinc;g+=ginc;b+=binc);\
        if (a>0) { pp=(PIXEL *)((char *)pp + pp_inc_1); ZZ(pz+=(inc_1));  a-=dx; }\
    else { pp=(PIXEL *)((char *)pp + pp_inc_2); ZZ(pz+=(inc_2)); a+=dy; }\
    } while (--n >= 0);

Definition at line 74 of file zline.h.

PUTPIXEL

#define PUTPIXEL

(

)

RGBPIXEL

Definition at line 71 of file zline.h.

RGB

#define RGB

(

x

)

Definition at line 51 of file zline.h.

RGBPIXEL

#define RGBPIXEL   *pp = color

Definition at line 55 of file zline.h.

ZZ

#define ZZ

(

x

)

Definition at line 70 of file zline.h.

Function Documentation

if() [1/4]

else if	(	dx	,
		0
	)

Definition at line 97 of file zline.h.

if() [2/4]

if

(

dx >=

dy

)

Definition at line 105 of file zline.h.

if() [3/4]

if

(

dx

= = 0 && dy == 0

)

Definition at line 95 of file zline.h.

if() [4/4]

if	(	p1->	y,
		p2->y||	p1->y==p2->y &&p1->x > p2->x
	)

Definition at line 17 of file zline.h.

Variable Documentation

a

register int a

Initial value:

{
    int n, dx, dy, sx, pp_inc_1, pp_inc_2

Definition at line 3 of file zline.h.

dx

dx = p2->x - p1->x

Definition at line 30 of file zline.h.

dy

dy = p2->y - p1->y

Definition at line 31 of file zline.h.

else

else

Initial value:

{
    dx = -dx

Definition at line 103 of file zline.h.

pp

pp = (PIXEL *) ((char *) zb->pbuf + zb->linesize * p1->y + p1->x * PSZB)

Definition at line 4 of file zline.h.

sx

sx = zb->xsize

Definition at line 23 of file zline.h.