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/*
* Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation
* All rights reserved.
*
* This file is part of the Gnome Library.
*
* The Gnome Library 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.
*
* The Gnome Library 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 the Gnome Library; see the file COPYING.LIB. If not,
* write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
@NOTATION@
*/
/* Line/curve item type for GnomeCanvas widget
*
* GnomeCanvas is basically a port of the Tk toolkit's most excellent canvas widget. Tk is
* copyrighted by the Regents of the University of California, Sun Microsystems, and other parties.
*
*
* Author: Federico Mena <federico@nuclecu.unam.mx>
*/
#ifndef GNOME_CANVAS_LINE_H
#define GNOME_CANVAS_LINE_H
#include <libgnomecanvas/gnome-canvas.h>
G_BEGIN_DECLS
/* Line item for the canvas. This is a polyline with configurable width, cap/join styles, and arrowheads.
* If arrowheads are enabled, then three values are used to specify their shape:
*
* arrow_shape_a: Distance from tip of arrowhead to the center point.
* arrow_shape_b: Distance from tip of arrowhead to trailing point, measured along the shaft.
* arrow_shape_c: Distance of trailing point from outside edge of shaft.
*
* The following object arguments are available:
*
* name type read/write description
* ------------------------------------------------------------------------------------------
* points GnomeCanvasPoints* RW Pointer to a GnomeCanvasPoints structure.
* This can be created by a call to
* gnome_canvas_points_new() (in gnome-canvas-util.h).
* X coordinates are in the even indices of the
* points->coords array, Y coordinates are in
* the odd indices.
* fill_color string W X color specification for line
* fill_color_gdk GdkColor* RW Pointer to an allocated GdkColor
* fill_stipple GdkBitmap* RW Stipple pattern for the line
* width_pixels uint R Width of the line in pixels. The line width
* will not be scaled when the canvas zoom factor changes.
* width_units double R Width of the line in canvas units. The line width
* will be scaled when the canvas zoom factor changes.
* cap_style GdkCapStyle RW Cap ("endpoint") style for the line.
* join_style GdkJoinStyle RW Join ("vertex") style for the line.
* line_style GdkLineStyle RW Line dash style
* first_arrowhead boolean RW Specifies whether to draw an arrowhead on the
* first point of the line.
* last_arrowhead boolean RW Specifies whether to draw an arrowhead on the
* last point of the line.
* smooth boolean RW Specifies whether to smooth the line using
* parabolic splines.
* spline_steps uint RW Specifies the number of steps to use when rendering curves.
* arrow_shape_a double RW First arrow shape specifier.
* arrow_shape_b double RW Second arrow shape specifier.
* arrow_shape_c double RW Third arrow shape specifier.
*/
#define GNOME_TYPE_CANVAS_LINE (gnome_canvas_line_get_type ())
#define GNOME_CANVAS_LINE(obj) (GTK_CHECK_CAST ((obj), GNOME_TYPE_CANVAS_LINE, GnomeCanvasLine))
#define GNOME_CANVAS_LINE_CLASS(klass) (GTK_CHECK_CLASS_CAST ((klass), GNOME_TYPE_CANVAS_LINE, GnomeCanvasLineClass))
#define GNOME_IS_CANVAS_LINE(obj) (GTK_CHECK_TYPE ((obj), GNOME_TYPE_CANVAS_LINE))
#define GNOME_IS_CANVAS_LINE_CLASS(klass) (GTK_CHECK_CLASS_TYPE ((klass), GNOME_TYPE_CANVAS_LINE))
#define GNOME_CANVAS_LINE_GET_CLASS(obj) (GTK_CHECK_GET_CLASS ((obj), GNOME_TYPE_CANVAS_LINE, GnomeCanvasLineClass))
typedef struct _GnomeCanvasLine GnomeCanvasLine;
typedef struct _GnomeCanvasLineClass GnomeCanvasLineClass;
struct _GnomeCanvasLine {
GnomeCanvasItem item;
double *coords; /* Array of coordinates for the line's points. X coords are in the
* even indices, Y coords are in the odd indices. If the line has
* arrowheads then the first and last points have been adjusted to
* refer to the necks of the arrowheads rather than their tips. The
* actual endpoints are stored in the first_arrow and last_arrow
* arrays, if they exist.
*/
double *first_coords; /* Array of points describing polygon for the first arrowhead */
double *last_coords; /* Array of points describing polygon for the last arrowhead */
GdkGC *gc; /* GC for drawing line */
GdkBitmap *stipple; /* Stipple pattern */
ArtSVP *fill_svp; /* The SVP for the outline shape */ /*AA*/
ArtSVP *first_svp; /* The SVP for the first arrow */ /*AA*/
ArtSVP *last_svp; /* The SVP for the last arrow */ /*AA*/
double width; /* Width of the line */
double shape_a; /* Distance from tip of arrowhead to center */
double shape_b; /* Distance from tip of arrowhead to trailing point, measured along shaft */
double shape_c; /* Distance of trailing points from outside edge of shaft */
GdkCapStyle cap; /* Cap style for line */
GdkJoinStyle join; /* Join style for line */
GdkLineStyle line_style;/* Style for the line */
gulong fill_pixel; /* Color for line */
guint32 fill_rgba; /* RGBA color for outline */ /*AA*/
int num_points; /* Number of points in the line */
guint fill_color; /* Fill color, RGBA */
int spline_steps; /* Number of steps in each spline segment */
guint width_pixels : 1; /* Is the width specified in pixels or units? */
guint first_arrow : 1; /* Draw first arrowhead? */
guint last_arrow : 1; /* Draw last arrowhead? */
guint smooth : 1; /* Smooth line (with parabolic splines)? */
};
struct _GnomeCanvasLineClass {
GnomeCanvasItemClass parent_class;
};
/* Standard Gtk function */
GType gnome_canvas_line_get_type (void) G_GNUC_CONST;
G_END_DECLS
#endif
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