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/*
* Color.h -- Header for color routines.
*
* Authors : Patrick Lecoanet.
* Creation date : Thu Dec 16 15:41:04 1999
*
* $Id$
*/
/*
* Copyright (c) 1993 - 1999 CENA, Patrick Lecoanet --
*
* This code is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This code 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this code; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#ifndef _Color_h
#define _Color_h
#include "Types.h"
#include "Geo.h"
/*
* Types of gradients.
*/
#define ZN_AXIAL_GRADIENT 0
#define ZN_RADIAL_GRADIENT 1
#define ZN_PATH_GRADIENT 2
typedef struct _ZnGradientColor {
unsigned char position; /* Color starting position along the gradient axis.
* This is in percent of the gradient total size. */
unsigned char control; /* Middle-shade position in percent of this color
* size along the gradient axis. */
unsigned char alpha; /* The color alpha channel in percent */
unsigned char mid_alpha;
XColor *rgb; /* The actual color description */
XColor *mid_rgb;
} ZnGradientColor;
typedef struct _ZnGradient {
int ref_count;
Tcl_HashEntry *hash;
char type; /* Either ZN_AXIAL_GRADIENT (lines) or
* ZN_RADIAL_GRADIENT (circles). */
union {
int angle; /* Angle spec for an axial gradient (Degrees). */
ZnPoint p; /* Center for a radial gradiant. */
} g;
unsigned int num_colors; /* Number of colors in gradient spec. */
ZnGradientColor colors[1];
} ZnGradient;
ZnGradient *ZnGetGradient(Tcl_Interp *interp, Tk_Window tkwin,
Tk_Uid name);
ZnGradient *ZnGetGradientByValue(ZnGradient *gradient);
ZnGradient *ZnGetReliefGradient(Tcl_Interp *interp, Tk_Window tkwin,
Tk_Uid name, unsigned short alpha);
ZnBool ZnGradientFlat(ZnGradient *grad);
XColor *ZnGetGradientColor(ZnGradient *gradient,
ZnReal position, unsigned short *alpha);
char *ZnNameOfGradient(ZnGradient *gradient);
void ZnFreeGradient(ZnGradient *gradient);
void ZnDeleteGradientName(char *name);
ZnBool ZnGradientNameExists(char *name);
ZnBool ZnNameGradient(Tcl_Interp *interp, Tk_Window tkwin,
char *grad_descr, char *name);
int ZnComposeAlpha(unsigned short alpha1, unsigned short alpha2);
#endif /* _Color_h */
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