/* * 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 */ #ifndef GNOME_CANVAS_LINE_H #define GNOME_CANVAS_LINE_H #include 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 * 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 gdouble 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 gdouble RW First arrow shape specifier. * arrow_shape_b gdouble RW Second arrow shape specifier. * arrow_shape_c gdouble RW Third arrow shape specifier. */ #define GNOME_TYPE_CANVAS_LINE (gnome_canvas_line_get_type ()) #define GNOME_CANVAS_LINE(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GNOME_TYPE_CANVAS_LINE, GnomeCanvasLine)) #define GNOME_CANVAS_LINE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GNOME_TYPE_CANVAS_LINE, GnomeCanvasLineClass)) #define GNOME_IS_CANVAS_LINE(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GNOME_TYPE_CANVAS_LINE)) #define GNOME_IS_CANVAS_LINE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GNOME_TYPE_CANVAS_LINE)) #define GNOME_CANVAS_LINE_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GNOME_TYPE_CANVAS_LINE, GnomeCanvasLineClass)) typedef struct _GnomeCanvasLine GnomeCanvasLine; typedef struct _GnomeCanvasLineClass GnomeCanvasLineClass; struct _GnomeCanvasLine { GnomeCanvasItem item; gdouble *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. */ gdouble *first_coords; /* Array of points describing polygon for the first arrowhead */ gdouble *last_coords; /* Array of points describing polygon for the last arrowhead */ GdkGC *gc; /* GC for drawing line */ 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*/ gdouble width; /* Width of the line */ gdouble shape_a; /* Distance from tip of arrowhead to center */ gdouble shape_b; /* Distance from tip of arrowhead to trailing point, measured along shaft */ gdouble shape_c; /* Distance of trailing points from outside edge of shaft */ cairo_line_cap_t cap; /* Cap style for line */ cairo_line_join_t join; /* Join style for line */ gulong fill_pixel; /* Color for line */ guint32 fill_rgba; /* RGBA color for outline */ /*AA*/ gint num_points; /* Number of points in the line */ guint fill_color; /* Fill color, RGBA */ gint 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