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-/*
- * Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation
- * All rights reserved.
- *
- * This file is part of the Mate Library.
- *
- * The Mate 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 Mate 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 Mate Library; see the file COPYING.LIB. If not,
- * write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- */
-/*
- @NOTATION@
- */
-/* Miscellaneous utility functions for the EelCanvas widget
- *
- * EelCanvas 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 <[email protected]>
- */
-
-#ifndef EEL_CANVAS_UTIL_H
-#define EEL_CANVAS_UTIL_H
-
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-
- /* 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.
- */
- typedef struct
- {
- double *coords;
- int num_points;
- int ref_count;
- } EelCanvasPoints;
-
-
- /* Allocate a new EelCanvasPoints structure with enough space for the specified number of points */
- EelCanvasPoints *eel_canvas_points_new (int num_points);
-
- /* Increate ref count */
- EelCanvasPoints *eel_canvas_points_ref (EelCanvasPoints *points);
-#define eel_canvas_points_unref eel_canvas_points_free
-
- /* Decrease ref count and free structure if it has reached zero */
- void eel_canvas_points_free (EelCanvasPoints *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 eel_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 eel_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 eel_canvas_polygon_to_point (double *poly, int num_points, double x, double y);
-
-
- void eel_canvas_item_reset_bounds (EelCanvasItem *item);
-
- /* Sets the bbox to the new value, requesting full repaint. */
- void eel_canvas_update_bbox (EelCanvasItem *item, int x1, int y1, int x2, int y2);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif