libfoocanvas/foo-canvas-line.h

   1 /*
   2  * Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation
   3  * All rights reserved.
   4  *
   5  * This file is part of the Gnome Library.
   6  *
   7  * The Gnome Library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Library General Public License as
   9  * published by the Free Software Foundation; either version 2 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * The Gnome Library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Library General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Library General Public
  18  * License along with the Gnome Library; see the file COPYING.LIB.  If not,
  19  * write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20  * Boston, MA 02111-1307, USA.
  21  */
  22 /*
  23   @NOTATION@
  24  */
  25
  26 /* Line/curve item type for FooCanvas widget
  27  *
  28  * FooCanvas is basically a port of the Tk toolkit's most excellent canvas widget.  Tk is
  29  * copyrighted by the Regents of the University of California, Sun Microsystems, and other parties.
  30  *
  31  *
  32  * Author: Federico Mena <federico@nuclecu.unam.mx>
  33  */
  34
  35 #ifndef FOO_CANVAS_LINE_H
  36 #define FOO_CANVAS_LINE_H
  37
  38
  39 #include <libfoocanvas/foo-canvas.h>
  40
  41
  42 G_BEGIN_DECLS
  43
  44
  45 /* Line item for the canvas.  This is a polyline with configurable width, cap/join styles, and arrowheads.
  46  * If arrowheads are enabled, then three values are used to specify their shape:
  47  *
  48  *      arrow_shape_a:  Distance from tip of arrowhead to the center point.
  49  *      arrow_shape_b:  Distance from tip of arrowhead to trailing point, measured along the shaft.
  50  *      arrow_shape_c:  Distance of trailing point from outside edge of shaft.
  51  *
  52  * The following object arguments are available:
  53  *
  54  * name                 type                    read/write      description
  55  * ------------------------------------------------------------------------------------------
  56  * points               FooCanvasPoints*        RW              Pointer to a FooCanvasPoints structure.
  57  *                                                              This can be created by a call to
  58  *                                                              foo_canvas_points_new() (in foo-canvas-util.h).
  59  *                                                              X coordinates are in the even indices of the
  60  *                                                              points->coords array, Y coordinates are in
  61  *                                                              the odd indices.
  62  * fill_color           string                  W               X color specification for line
  63  * fill_color_gdk       GdkColor*               RW              Pointer to an allocated GdkColor
  64  * fill_stipple         GdkBitmap*              RW              Stipple pattern for the line
  65  * width_pixels         uint                    R               Width of the line in pixels.  The line width
  66  *                                                              will not be scaled when the canvas zoom factor changes.
  67  * width_units          double                  R               Width of the line in canvas units.  The line width
  68  *                                                              will be scaled when the canvas zoom factor changes.
  69  * cap_style            GdkCapStyle             RW              Cap ("endpoint") style for the line.
  70  * join_style           GdkJoinStyle            RW              Join ("vertex") style for the line.
  71  * line_style           GdkLineStyle            RW              Line dash style
  72  * first_arrowhead      boolean                 RW              Specifies whether to draw an arrowhead on the
  73  *                                                              first point of the line.
  74  * last_arrowhead       boolean                 RW              Specifies whether to draw an arrowhead on the
  75  *                                                              last point of the line.
  76  * smooth               boolean                 RW              Specifies whether to smooth the line using
  77  *                                                              parabolic splines.
  78  * spline_steps         uint                    RW              Specifies the number of steps to use when rendering curves.
  79  * arrow_shape_a        double                  RW              First arrow shape specifier.
  80  * arrow_shape_b        double                  RW              Second arrow shape specifier.
  81  * arrow_shape_c        double                  RW              Third arrow shape specifier.
  82  */
  83
  84
  85 #define FOO_TYPE_CANVAS_LINE            (foo_canvas_line_get_type ())
  86 #define FOO_CANVAS_LINE(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), FOO_TYPE_CANVAS_LINE, FooCanvasLine))
  87 #define FOO_CANVAS_LINE_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), FOO_TYPE_CANVAS_LINE, FooCanvasLineClass))
  88 #define FOO_IS_CANVAS_LINE(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), FOO_TYPE_CANVAS_LINE))
  89 #define FOO_IS_CANVAS_LINE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), FOO_TYPE_CANVAS_LINE))
  90 #define FOO_CANVAS_LINE_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), FOO_TYPE_CANVAS_LINE, FooCanvasLineClass))
  91
  92
  93 typedef struct _FooCanvasLine FooCanvasLine;
  94 typedef struct _FooCanvasLineClass FooCanvasLineClass;
  95
  96 struct _FooCanvasLine {
  97         FooCanvasItem item;
  98
  99         double *coords;         /* Array of coordinates for the line's points.  X coords are in the
 100                                  * even indices, Y coords are in the odd indices.  If the line has
 101                                  * arrowheads then the first and last points have been adjusted to
 102                                  * refer to the necks of the arrowheads rather than their tips.  The
 103                                  * actual endpoints are stored in the first_arrow and last_arrow
 104                                  * arrays, if they exist.
 105                                  */
 106
 107         double *first_coords;   /* Array of points describing polygon for the first arrowhead */
 108         double *last_coords;    /* Array of points describing polygon for the last arrowhead */
 109
 110         GdkBitmap *stipple;     /* Stipple pattern */
 111
 112         double width;           /* Width of the line */
 113
 114         double shape_a;         /* Distance from tip of arrowhead to center */
 115         double shape_b;         /* Distance from tip of arrowhead to trailing point, measured along shaft */
 116         double shape_c;         /* Distance of trailing points from outside edge of shaft */
 117
 118         GdkCapStyle cap;        /* Cap style for line */
 119         GdkJoinStyle join;      /* Join style for line */
 120         GdkLineStyle line_style;/* Style for the line */
 121
 122         gulong fill_pixel;      /* Color for line */
 123         guint32 fill_rgba;              /* RGBA color for outline */ /*AA*/
 124
 125         int num_points;         /* Number of points in the line */
 126         guint width_pixels : 1; /* Is the width specified in pixels or units? */
 127         guint first_arrow : 1;  /* Draw first arrowhead? */
 128         guint last_arrow : 1;   /* Draw last arrowhead? */
 129         guint smooth : 1;       /* Smooth line (with parabolic splines)? */
 130         guint aa: 1; /* Enable anti-alias for this item */
 131 };
 132
 133 struct _FooCanvasLineClass {
 134         FooCanvasItemClass parent_class;
 135 };
 136
 137
 138 /* Standard Gtk function */
 139 GType foo_canvas_line_get_type (void) G_GNUC_CONST;
 140
 141
 142 G_END_DECLS
 143
 144 #endif