From 0e004c696b0e68b2cff37a4c3315b022a35eaf43 Mon Sep 17 00:00:00 2001
From: Perberos <perberos@gmail.com>
Date: Thu, 1 Dec 2011 22:24:23 -0300
Subject: moving from https://github.com/perberos/mate-desktop-environment

---
 eel/eel-canvas-util.h | 110 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 eel/eel-canvas-util.h

(limited to 'eel/eel-canvas-util.h')

diff --git a/eel/eel-canvas-util.h b/eel/eel-canvas-util.h
new file mode 100644
index 00000000..e4484cde
--- /dev/null
+++ b/eel/eel-canvas-util.h
@@ -0,0 +1,110 @@
+/*
+ * 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, 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 <federico@nuclecu.unam.mx>
+ */
+
+#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
-- 
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