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* Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation
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* This file is part of the Gnome Library.
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* The Gnome Library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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* The Gnome Library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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* You should have received a copy of the GNU Library General Public
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* License along with the Gnome Library; see the file COPYING.LIB. If not,
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* write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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/* Line/curve item type for GnomeCanvas widget
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* GnomeCanvas is basically a port of the Tk toolkit's most excellent canvas widget. Tk is
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* copyrighted by the Regents of the University of California, Sun Microsystems, and other parties.
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* Author: Federico Mena <federico@nuclecu.unam.mx>
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#ifndef GNOME_CANVAS_LINE_H
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#define GNOME_CANVAS_LINE_H
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#include <libgnomecanvas/gnome-canvas.h>
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/* Line item for the canvas. This is a polyline with configurable width, cap/join styles, and arrowheads.
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* If arrowheads are enabled, then three values are used to specify their shape:
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* arrow_shape_a: Distance from tip of arrowhead to the center point.
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* arrow_shape_b: Distance from tip of arrowhead to trailing point, measured along the shaft.
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* arrow_shape_c: Distance of trailing point from outside edge of shaft.
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* The following object arguments are available:
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* name type read/write description
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* ------------------------------------------------------------------------------------------
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* points GnomeCanvasPoints* RW Pointer to a GnomeCanvasPoints structure.
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* This can be created by a call to
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* gnome_canvas_points_new() (in gnome-canvas-util.h).
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* X coordinates are in the even indices of the
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* points->coords array, Y coordinates are in
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* fill_color string W X color specification for line
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* fill_color_gdk GdkColor* RW Pointer to an allocated GdkColor
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* fill_stipple GdkBitmap* RW Stipple pattern for the line
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* width_pixels uint R Width of the line in pixels. The line width
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* will not be scaled when the canvas zoom factor changes.
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* width_units double R Width of the line in canvas units. The line width
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* will be scaled when the canvas zoom factor changes.
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* cap_style GdkCapStyle RW Cap ("endpoint") style for the line.
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* join_style GdkJoinStyle RW Join ("vertex") style for the line.
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* line_style GdkLineStyle RW Line dash style
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* first_arrowhead boolean RW Specifies whether to draw an arrowhead on the
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* first point of the line.
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* last_arrowhead boolean RW Specifies whether to draw an arrowhead on the
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* last point of the line.
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* smooth boolean RW Specifies whether to smooth the line using
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* spline_steps uint RW Specifies the number of steps to use when rendering curves.
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* arrow_shape_a double RW First arrow shape specifier.
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* arrow_shape_b double RW Second arrow shape specifier.
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* arrow_shape_c double RW Third arrow shape specifier.
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#define GNOME_TYPE_CANVAS_LINE (gnome_canvas_line_get_type ())
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#define GNOME_CANVAS_LINE(obj) (GTK_CHECK_CAST ((obj), GNOME_TYPE_CANVAS_LINE, GnomeCanvasLine))
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#define GNOME_CANVAS_LINE_CLASS(klass) (GTK_CHECK_CLASS_CAST ((klass), GNOME_TYPE_CANVAS_LINE, GnomeCanvasLineClass))
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#define GNOME_IS_CANVAS_LINE(obj) (GTK_CHECK_TYPE ((obj), GNOME_TYPE_CANVAS_LINE))
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#define GNOME_IS_CANVAS_LINE_CLASS(klass) (GTK_CHECK_CLASS_TYPE ((klass), GNOME_TYPE_CANVAS_LINE))
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#define GNOME_CANVAS_LINE_GET_CLASS(obj) (GTK_CHECK_GET_CLASS ((obj), GNOME_TYPE_CANVAS_LINE, GnomeCanvasLineClass))
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typedef struct _GnomeCanvasLine GnomeCanvasLine;
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typedef struct _GnomeCanvasLineClass GnomeCanvasLineClass;
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struct _GnomeCanvasLine {
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double *coords; /* Array of coordinates for the line's points. X coords are in the
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* even indices, Y coords are in the odd indices. If the line has
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* arrowheads then the first and last points have been adjusted to
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* refer to the necks of the arrowheads rather than their tips. The
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* actual endpoints are stored in the first_arrow and last_arrow
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* arrays, if they exist.
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double *first_coords; /* Array of points describing polygon for the first arrowhead */
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double *last_coords; /* Array of points describing polygon for the last arrowhead */
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GdkGC *gc; /* GC for drawing line */
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GdkBitmap *stipple; /* Stipple pattern */
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ArtSVP *fill_svp; /* The SVP for the outline shape */ /*AA*/
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ArtSVP *first_svp; /* The SVP for the first arrow */ /*AA*/
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ArtSVP *last_svp; /* The SVP for the last arrow */ /*AA*/
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double width; /* Width of the line */
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double shape_a; /* Distance from tip of arrowhead to center */
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double shape_b; /* Distance from tip of arrowhead to trailing point, measured along shaft */
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double shape_c; /* Distance of trailing points from outside edge of shaft */
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GdkCapStyle cap; /* Cap style for line */
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GdkJoinStyle join; /* Join style for line */
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GdkLineStyle line_style;/* Style for the line */
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gulong fill_pixel; /* Color for line */
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guint32 fill_rgba; /* RGBA color for outline */ /*AA*/
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int num_points; /* Number of points in the line */
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guint fill_color; /* Fill color, RGBA */
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int spline_steps; /* Number of steps in each spline segment */
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guint width_pixels : 1; /* Is the width specified in pixels or units? */
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guint first_arrow : 1; /* Draw first arrowhead? */
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guint last_arrow : 1; /* Draw last arrowhead? */
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guint smooth : 1; /* Smooth line (with parabolic splines)? */
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struct _GnomeCanvasLineClass {
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GnomeCanvasItemClass parent_class;
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/* Standard Gtk function */
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GType gnome_canvas_line_get_type (void) G_GNUC_CONST;