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-rw-r--r--eel/eel-art-extensions.c191
1 files changed, 191 insertions, 0 deletions
diff --git a/eel/eel-art-extensions.c b/eel/eel-art-extensions.c
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+++ b/eel/eel-art-extensions.c
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+/* eel-art-extensions.c - implementation of libart extension functions.
+ *
+ * Copyright (C) 2000 Eazel, Inc.
+ *
+ * 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,
+ * see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Darin Adler <darin@eazel.com>
+ * Ramiro Estrugo <ramiro@eazel.com>
+ */
+
+#include <config.h>
+
+#include "eel-art-extensions.h"
+#include "eel-lib-self-check-functions.h"
+#include <math.h>
+
+const EelDRect eel_drect_empty = { 0.0, 0.0, 0.0, 0.0 };
+const EelIRect eel_irect_empty = { 0, 0, 0, 0 };
+
+static void
+eel_irect_copy (EelIRect *dest,
+ const EelIRect *src)
+{
+ dest->x0 = src->x0;
+ dest->y0 = src->y0;
+ dest->x1 = src->x1;
+ dest->y1 = src->y1;
+}
+
+static gboolean
+eel_irect_is_empty (const EelIRect *src)
+{
+ return (src->x1 <= src->x0 ||
+ src->y1 <= src->y0);
+}
+
+void
+eel_irect_union (EelIRect *dest,
+ const EelIRect *src1,
+ const EelIRect *src2)
+{
+ if (eel_irect_is_empty (src1))
+ {
+ eel_irect_copy (dest, src2);
+ }
+ else if (eel_irect_is_empty (src2))
+ {
+ eel_irect_copy (dest, src1);
+ }
+ else
+ {
+ dest->x0 = MIN (src1->x0, src2->x0);
+ dest->y0 = MIN (src1->y0, src2->y0);
+ dest->x1 = MAX (src1->x1, src2->x1);
+ dest->y1 = MAX (src1->y1, src2->y1);
+ }
+}
+
+static void
+eel_irect_intersect (EelIRect *dest,
+ const EelIRect *src1,
+ const EelIRect *src2)
+{
+ dest->x0 = MAX (src1->x0, src2->x0);
+ dest->y0 = MAX (src1->y0, src2->y0);
+ dest->x1 = MIN (src1->x1, src2->x1);
+ dest->y1 = MIN (src1->y1, src2->y1);
+}
+
+/**
+ * eel_irect_get_width:
+ *
+ * @rectangle: An EelIRect.
+ *
+ * Returns: The width of the rectangle.
+ *
+ */
+int
+eel_irect_get_width (EelIRect rectangle)
+{
+ return rectangle.x1 - rectangle.x0;
+}
+
+/**
+ * eel_irect_get_height:
+ *
+ * @rectangle: An EelIRect.
+ *
+ * Returns: The height of the rectangle.
+ *
+ */
+int
+eel_irect_get_height (EelIRect rectangle)
+{
+ return rectangle.y1 - rectangle.y0;
+}
+
+
+static void
+eel_drect_copy (EelDRect *dest,
+ const EelDRect *src)
+{
+ dest->x0 = src->x0;
+ dest->y0 = src->y0;
+ dest->x1 = src->x1;
+ dest->y1 = src->y1;
+}
+
+static gboolean
+eel_drect_is_empty (const EelDRect *src)
+{
+ return (src->x1 <= src->x0 || src->y1 <= src->y0);
+}
+
+void
+eel_drect_union (EelDRect *dest,
+ const EelDRect *src1,
+ const EelDRect *src2)
+{
+ if (eel_drect_is_empty (src1))
+ {
+ eel_drect_copy (dest, src2);
+ }
+ else if (eel_drect_is_empty (src2))
+ {
+ eel_drect_copy (dest, src1);
+ }
+ else
+ {
+ dest->x0 = MIN (src1->x0, src2->x0);
+ dest->y0 = MIN (src1->y0, src2->y0);
+ dest->x1 = MAX (src1->x1, src2->x1);
+ dest->y1 = MAX (src1->y1, src2->y1);
+ }
+}
+
+gboolean
+eel_irect_hits_irect (EelIRect rectangle_a,
+ EelIRect rectangle_b)
+{
+ EelIRect intersection;
+ eel_irect_intersect (&intersection, &rectangle_a, &rectangle_b);
+ return !eel_irect_is_empty (&intersection);
+}
+
+gboolean
+eel_irect_equal (EelIRect rectangle_a,
+ EelIRect rectangle_b)
+{
+ return rectangle_a.x0 == rectangle_b.x0
+ && rectangle_a.y0 == rectangle_b.y0
+ && rectangle_a.x1 == rectangle_b.x1
+ && rectangle_a.y1 == rectangle_b.y1;
+}
+
+EelIRect
+eel_irect_offset_by (EelIRect rectangle,
+ int x,
+ int y)
+{
+ rectangle.x0 += x;
+ rectangle.x1 += x;
+ rectangle.y0 += y;
+ rectangle.y1 += y;
+
+ return rectangle;
+}
+
+EelIRect
+eel_irect_scale_by (EelIRect rectangle,
+ double scale)
+{
+ rectangle.x0 *= scale;
+ rectangle.x1 *= scale;
+ rectangle.y0 *= scale;
+ rectangle.y1 *= scale;
+
+ return rectangle;
+}