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/* This file is part of the GNU libxmi package.
Copyright (C) 1985, 1986, 1987, 1988, 1989, X Consortium. For an
associated permission notice, see the accompanying file README-X.
GNU enhancements Copyright (C) 1998, 1999, 2000, 2005, Free Software
Foundation, Inc.
The GNU libxmi package is free software. You may redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software foundation; either version 2, or (at your
option) any later version.
The GNU libxmi package is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License along
with the GNU plotutils package; see the file COPYING. If not, write to
the Free Software Foundation, Inc., 51 Franklin St., Fifth Floor,
Boston, MA 02110-1301, USA. */
/* This header file is included by mi_fllarc.c (which contains code for
filling a poly-arc) and mi_arc.c (which contains code for drawing a wide
poly-arc). */
#define FULLCIRCLE (360 * 64)
/*----------------------------------------------------------------------*/
/* Structures and macros used by arc-filling code in mi_arc.c */
/*----------------------------------------------------------------------*/
/* Structure containing variables that are updated during a scan through a
filled arc. */
typedef struct
{
int xorg, yorg;
int y;
int dx, dy;
int e;
int ym, yk, xm, xk;
} miFillArc;
/* A floating-point version, used for non-circular arcs one of whose
dimensions (width or height) is greater than 800 pixels. Could use
64-bit integers. */
typedef struct
{
int xorg, yorg; /* upper left corner */
int y; /* vertical semi-axis */
int dx, dy;
double e;
double ym, yk, xm, xk;
} miFillArcD;
/* Which to use? */
#define MI_CAN_FILL_ARC(arc) (((arc)->width == (arc)->height) || \
(((arc)->width <= 800) && ((arc)->height <= 800)))
/* Nothing to draw? */
#define MI_FILLED_ARC_IS_EMPTY(arc) (!(arc)->angle2 || \
!(arc)->width || !(arc)->height || \
(((arc)->width == 1) && ((arc)->height & 1)))
/* used for setup only */
#define MIFILLARCSETUP(info, x, y, e, xk, xm, yk, ym, dx, dy, xorg, yorg) \
x = 0; \
y = info.y; \
e = info.e; \
xk = info.xk; \
xm = info.xm; \
yk = info.yk; \
ym = info.ym; \
dx = info.dx; \
dy = info.dy; \
xorg = info.xorg; \
yorg = info.yorg
#define MIFILLARCSTEP(x, y, e, xk, xm, yk, ym, dx, slw) \
e += yk; \
while (e >= 0) \
{ \
x++; \
xk -= xm; \
e += xk; \
} \
y--; \
yk -= ym; \
slw = (x << 1) + dx; \
if ((e == xk) && (slw > 1)) \
slw--
#define MIFILLARCLOWER(e, xk, y, dy, slw) (((y + dy) != 0) && ((slw > 1) || (e != xk)))
/* pie-slice related things */
typedef struct
{
int x;
int stepx;
int deltax;
int e;
int dy;
int dx;
} miSliceEdge;
typedef struct
{
miSliceEdge edge1, edge2;
int min_top_y, max_top_y;
int min_bot_y, max_bot_y;
bool edge1_top, edge2_top;
bool flip_top, flip_bot;
} miArcSlice;
#define MIARCSLICESTEP(edge) \
edge.x -= edge.stepx; \
edge.e -= edge.dx; \
if (edge.e <= 0) \
{ \
edge.x -= edge.deltax; \
edge.e += edge.dy; \
}
#define MIFILLSLICEUPPER(y, slice) \
((y >= slice.min_top_y) && (y <= slice.max_top_y))
#define MIFILLSLICELOWER(y, slice) \
((y >= slice.min_bot_y) && (y <= slice.max_bot_y))
#define MIARCSLICEUPPER(xl,xr,slice,slw) \
xl = xorg - x; \
xr = xl + slw - 1; \
if (slice.edge1_top && (slice.edge1.x < xr)) \
xr = slice.edge1.x; \
if (slice.edge2_top && (slice.edge2.x > xl)) \
xl = slice.edge2.x;
#define MIARCSLICELOWER(xl,xr,slice,slw) \
xl = xorg - x; \
xr = xl + slw - 1; \
if (!slice.edge1_top && (slice.edge1.x > xl)) \
xl = slice.edge1.x; \
if (!slice.edge2_top && (slice.edge2.x < xr)) \
xr = slice.edge2.x;
/*----------------------------------------------------------------------*/
/* Macros used by wide-arc-drawing code in mi_arc.c */
/*----------------------------------------------------------------------*/
/* used for setup only */
#define MIWIDEARCSETUP(x,y,dy,slw,e,xk,xm,yk,ym) \
x = 0; \
y = slw >> 1; \
yk = y << 3; \
xm = 8; \
ym = 8; \
if (dy) \
{ \
xk = 0; \
if (slw & 1) \
e = -1; \
else \
e = -(y << 2) - 2; \
} \
else \
{ \
y++; \
yk += 4; \
xk = -4; \
if (slw & 1) \
e = -(y << 2) - 3; \
else \
e = - (y << 3); \
}
#define MIFILLINARCSTEP(inx, iny, ine, inxk, inxm, inyk, inym, dx, slw) \
ine += inyk; \
while (ine >= 0) \
{ \
inx++; \
inxk -= inxm; \
ine += inxk; \
} \
iny--; \
inyk -= inym; \
slw = (inx << 1) + dx; \
if ((ine == inxk) && (slw > 1)) \
slw--
/*----------------------------------------------------------------------*/
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