/* * 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@ */ /* Miscellaneous utility functions for the 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_UTIL_H #define GNOME_CANVAS_UTIL_H #include #include #include #include G_BEGIN_DECLS typedef struct _GnomeCanvasPoints GnomeCanvasPoints; /* This structure defines an array of points. X coordinates are stored in the even-numbered * indices, and Y coordinates are stored in the odd-numbered indices. num_points indicates the * number of points, so the array is 2*num_points elements big. */ struct _GnomeCanvasPoints { double *coords; int num_points; int ref_count; }; /* Allocate a new GnomeCanvasPoints structure with enough space for the specified number of points */ GnomeCanvasPoints *gnome_canvas_points_new (int num_points); /* Increate ref count */ GnomeCanvasPoints *gnome_canvas_points_ref (GnomeCanvasPoints *points); #define gnome_canvas_points_unref gnome_canvas_points_free /* Decrease ref count and free structure if it has reached zero */ void gnome_canvas_points_free (GnomeCanvasPoints *points); /* Given three points forming an angle, compute the coordinates of the inside and outside points of * the mitered corner formed by a line of a given width at that angle. * * If the angle is less than 11 degrees, then FALSE is returned and the return points are not * modified. Otherwise, TRUE is returned. */ int gnome_canvas_get_miter_points (double x1, double y1, double x2, double y2, double x3, double y3, double width, double *mx1, double *my1, double *mx2, double *my2); /* Compute the butt points of a line segment. If project is FALSE, then the results are as follows: * * -------------------* (bx1, by1) * | * (x1, y1) *------------------* (x2, y2) * | * -------------------* (bx2, by2) * * that is, the line is not projected beyond (x2, y2). If project is TRUE, then the results are as * follows: * * -------------------* (bx1, by1) * (x2, y2) | * (x1, y1) *-------------* | * | * -------------------* (bx2, by2) */ void gnome_canvas_get_butt_points (double x1, double y1, double x2, double y2, double width, int project, double *bx1, double *by1, double *bx2, double *by2); /* Calculate the distance from a polygon to a point. The polygon's X coordinates are in the even * indices of the poly array, and the Y coordinates are in the odd indices. */ double gnome_canvas_polygon_to_point (double *poly, int num_points, double x, double y); /* Render the svp over the buf. */ void gnome_canvas_render_svp (GnomeCanvasBuf *buf, ArtSVP *svp, guint32 rgba); /* Sets the svp to the new value, requesting repaint on what's changed. This function takes responsibility for * freeing new_svp. */ void gnome_canvas_update_svp (GnomeCanvas *canvas, ArtSVP **p_svp, ArtSVP *new_svp); /* Sets the svp to the new value, clipping if necessary, and requesting repaint * on what's changed. This function takes responsibility for freeing new_svp. */ void gnome_canvas_update_svp_clip (GnomeCanvas *canvas, ArtSVP **p_svp, ArtSVP *new_svp, ArtSVP *clip_svp); /* Sets the svp to the new value, requesting repaint on what's changed. This * function takes responsibility for freeing new_svp. This routine also adds the * svp's bbox to the item's. */ void gnome_canvas_item_reset_bounds (GnomeCanvasItem *item); /* Sets the svp to the new value, requesting repaint on what's changed. This function takes responsibility for * freeing new_svp. This routine also adds the svp's bbox to the item's. */ void gnome_canvas_item_update_svp (GnomeCanvasItem *item, ArtSVP **p_svp, ArtSVP *new_svp); /* Sets the svp to the new value, clipping if necessary, and requesting repaint * on what's changed. This function takes responsibility for freeing new_svp. */ void gnome_canvas_item_update_svp_clip (GnomeCanvasItem *item, ArtSVP **p_svp, ArtSVP *new_svp, ArtSVP *clip_svp); /* Request redraw of the svp if in aa mode, or the entire item in in xlib * mode. */ void gnome_canvas_item_request_redraw_svp (GnomeCanvasItem *item, const ArtSVP *svp); /* Sets the bbox to the new value, requesting full repaint. */ void gnome_canvas_update_bbox (GnomeCanvasItem *item, int x1, int y1, int x2, int y2); /* Ensure that the buffer is in RGB format, suitable for compositing. */ void gnome_canvas_buf_ensure_buf (GnomeCanvasBuf *buf); /* Convert from GDK line join specifier to libart. */ ArtPathStrokeJoinType gnome_canvas_join_gdk_to_art (GdkJoinStyle gdk_join); /* Convert from GDK line cap specifier to libart. */ ArtPathStrokeCapType gnome_canvas_cap_gdk_to_art (GdkCapStyle gdk_cap); G_END_DECLS #endif