--- /dev/null
+/* Libart_LGPL - library of basic graphic primitives
+ * Copyright (C) 1998 Raph Levien
+ *
+ * This 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.
+ *
+ * This 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 this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+#include "art_rect.h"
+
+#include <math.h>
+
+#ifndef MAX
+#define MAX(a, b) (((a) > (b)) ? (a) : (b))
+#endif /* MAX */
+
+#ifndef MIN
+#define MIN(a, b) (((a) < (b)) ? (a) : (b))
+#endif /* MIN */
+
+/* rectangle primitives stolen from gzilla */
+
+/**
+ * art_irect_copy: Make a copy of an integer rectangle.
+ * @dest: Where the copy is stored.
+ * @src: The source rectangle.
+ *
+ * Copies the rectangle.
+ **/
+void
+art_irect_copy (ArtIRect *dest, const ArtIRect *src) {
+ dest->x0 = src->x0;
+ dest->y0 = src->y0;
+ dest->x1 = src->x1;
+ dest->y1 = src->y1;
+}
+
+/**
+ * art_irect_union: Find union of two integer rectangles.
+ * @dest: Where the result is stored.
+ * @src1: A source rectangle.
+ * @src2: Another source rectangle.
+ *
+ * Finds the smallest rectangle that includes @src1 and @src2.
+ **/
+void
+art_irect_union (ArtIRect *dest, const ArtIRect *src1, const ArtIRect *src2) {
+ if (art_irect_empty (src1)) {
+ art_irect_copy (dest, src2);
+ } else if (art_irect_empty (src2)) {
+ art_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);
+ }
+}
+
+/**
+ * art_irect_intersection: Find intersection of two integer rectangles.
+ * @dest: Where the result is stored.
+ * @src1: A source rectangle.
+ * @src2: Another source rectangle.
+ *
+ * Finds the intersection of @src1 and @src2.
+ **/
+void
+art_irect_intersect (ArtIRect *dest, const ArtIRect *src1, const ArtIRect *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);
+}
+
+/**
+ * art_irect_empty: Determine whether integer rectangle is empty.
+ * @src: The source rectangle.
+ *
+ * Return value: TRUE if @src is an empty rectangle, FALSE otherwise.
+ **/
+int
+art_irect_empty (const ArtIRect *src) {
+ return (src->x1 <= src->x0 || src->y1 <= src->y0);
+}
+
+#if 0
+gboolean irect_point_inside (ArtIRect *rect, GzwPoint *point) {
+ return (point->x >= rect->x0 && point->y >= rect->y0 &&
+ point->x < rect->x1 && point->y < rect->y1);
+}
+#endif
+
+/**
+ * art_drect_copy: Make a copy of a rectangle.
+ * @dest: Where the copy is stored.
+ * @src: The source rectangle.
+ *
+ * Copies the rectangle.
+ **/
+void
+art_drect_copy (ArtDRect *dest, const ArtDRect *src) {
+ dest->x0 = src->x0;
+ dest->y0 = src->y0;
+ dest->x1 = src->x1;
+ dest->y1 = src->y1;
+}
+
+/**
+ * art_drect_union: Find union of two rectangles.
+ * @dest: Where the result is stored.
+ * @src1: A source rectangle.
+ * @src2: Another source rectangle.
+ *
+ * Finds the smallest rectangle that includes @src1 and @src2.
+ **/
+void
+art_drect_union (ArtDRect *dest, const ArtDRect *src1, const ArtDRect *src2) {
+ if (art_drect_empty (src1)) {
+ art_drect_copy (dest, src2);
+ } else if (art_drect_empty (src2)) {
+ art_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);
+ }
+}
+
+/**
+ * art_drect_intersection: Find intersection of two rectangles.
+ * @dest: Where the result is stored.
+ * @src1: A source rectangle.
+ * @src2: Another source rectangle.
+ *
+ * Finds the intersection of @src1 and @src2.
+ **/
+void
+art_drect_intersect (ArtDRect *dest, const ArtDRect *src1, const ArtDRect *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);
+}
+
+/**
+ * art_irect_empty: Determine whether rectangle is empty.
+ * @src: The source rectangle.
+ *
+ * Return value: TRUE if @src is an empty rectangle, FALSE otherwise.
+ **/
+int
+art_drect_empty (const ArtDRect *src) {
+ return (src->x1 <= src->x0 || src->y1 <= src->y0);
+}
+
+/**
+ * art_drect_affine_transform: Affine transform rectangle.
+ * @dst: Where to store the result.
+ * @src: The source rectangle.
+ * @matrix: The affine transformation.
+ *
+ * Find the smallest rectangle enclosing the affine transformed @src.
+ * The result is exactly the affine transformation of @src when
+ * @matrix specifies a rectilinear affine transformation, otherwise it
+ * is a conservative approximation.
+ **/
+void
+art_drect_affine_transform (ArtDRect *dst, const ArtDRect *src, const double matrix[6])
+{
+ double x00, y00, x10, y10;
+ double x01, y01, x11, y11;
+
+ x00 = src->x0 * matrix[0] + src->y0 * matrix[2] + matrix[4];
+ y00 = src->x0 * matrix[1] + src->y0 * matrix[3] + matrix[5];
+ x10 = src->x1 * matrix[0] + src->y0 * matrix[2] + matrix[4];
+ y10 = src->x1 * matrix[1] + src->y0 * matrix[3] + matrix[5];
+ x01 = src->x0 * matrix[0] + src->y1 * matrix[2] + matrix[4];
+ y01 = src->x0 * matrix[1] + src->y1 * matrix[3] + matrix[5];
+ x11 = src->x1 * matrix[0] + src->y1 * matrix[2] + matrix[4];
+ y11 = src->x1 * matrix[1] + src->y1 * matrix[3] + matrix[5];
+ dst->x0 = MIN (MIN (x00, x10), MIN (x01, x11));
+ dst->y0 = MIN (MIN (y00, y10), MIN (y01, y11));
+ dst->x1 = MAX (MAX (x00, x10), MAX (x01, x11));
+ dst->y1 = MAX (MAX (y00, y10), MAX (y01, y11));
+}
+
+/**
+ * art_drect_to_irect: Convert rectangle to integer rectangle.
+ * @dst: Where to store resulting integer rectangle.
+ * @src: The source rectangle.
+ *
+ * Find the smallest integer rectangle that encloses @src.
+ **/
+void
+art_drect_to_irect (ArtIRect *dst, ArtDRect *src)
+{
+ dst->x0 = floor (src->x0);
+ dst->y0 = floor (src->y0);
+ dst->x1 = ceil (src->x1);
+ dst->y1 = ceil (src->y1);
+}
git.asbjorn.biz / swftools.git / blobdiff