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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 - 2005 CENA, Patrick Lecoanet --
*
* See the file "Copyright" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
*/
#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
#define ZN_CONICAL_GRADIENT 3
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, ZN_RADIAL_GRADIENT or
* ZN_PATH_GRADIENT. */
int angle; /* Angle for an axial gradient (Degrees). */
ZnPoint p; /* Start for an axial/radial/path gradiant. In
* percent of the bbox. */
ZnPoint e; /* End of the axial/radial gradiant in percent
* of bbox. */
unsigned int num_actual_colors;/* Number of adjusted colors */
ZnGradientColor *actual_colors;/* Actual adjusted gradient color spec. May
* be the same array as color_spec. */
unsigned int num_colors_in; /* Number of colors in gradient spec. */
ZnGradientColor colors_in[1]; /* Gradient color spec */
} ZnGradient;
#define ZnGetGradientPixel(gradient, position) \
ZnPixel(ZnGetGradientColor(gradient, position, NULL))
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);
void ZnInterpGradientColor(ZnGradient *gradient, ZnReal position,
XColor *color, 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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