Initial revision

source/blender/blenlib/intern/rct.c

@@ -0,0 +1,115 @@
+/*
+ * 
+ * rct.c
+ * 
+ * april 95
+ * 
+ * $Id$
+ *
+ * A minimalist lib for functions doing stuff with rectangle structs.
+ *
+ * ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version. The Blender
+ * Foundation also sells licenses for use in proprietary software under
+ * the Blender License.  See http://www.blender.org/BL/ for information
+ * about this.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): none yet.
+ *
+ * ***** END GPL/BL DUAL LICENSE BLOCK *****
+ *
+ */
+
+#include "DNA_vec_types.h"
+#include "BLI_blenlib.h"
+
+int BLI_rcti_is_empty(rcti * rect)
+{
+	return ((rect->xmax<=rect->xmin) ||
+			(rect->ymax<=rect->ymin));
+}
+
+int BLI_in_rcti(rcti * rect, int x, int y)
+{
+
+	if(x<rect->xmin) return 0;
+	if(x>rect->xmax) return 0;
+	if(y<rect->ymin) return 0;
+	if(y>rect->ymax) return 0;
+	return 1;
+}
+
+int BLI_in_rctf(rctf *rect, float x, float y)
+{
+
+	if(x<rect->xmin) return 0;
+	if(x>rect->xmax) return 0;
+	if(y<rect->ymin) return 0;
+	if(y>rect->ymax) return 0;
+	return 1;
+}
+
+void BLI_union_rctf(rctf *rct1, rctf *rct2)
+{
+
+	if(rct1->xmin>rct2->xmin) rct1->xmin= rct2->xmin;
+	if(rct1->xmax<rct2->xmax) rct1->xmax= rct2->xmax;
+	if(rct1->ymin>rct2->ymin) rct1->ymin= rct2->ymin;
+	if(rct1->ymax<rct2->ymax) rct1->ymax= rct2->ymax;
+}
+
+void BLI_init_rctf(rctf *rect, float xmin, float xmax, float ymin, float ymax)
+{
+	rect->xmin= xmin;
+	rect->xmax= xmax;
+	rect->ymin= ymin;
+	rect->ymax= ymax;
+}
+
+int BLI_isect_rctf(rctf *src1, rctf *src2, rctf *dest)
+{
+	float xmin, xmax;
+	float ymin, ymax;
+
+	xmin = (src1->xmin) > (src2->xmin) ? (src1->xmin) : (src2->xmin);
+	xmax = (src1->xmax) < (src2->xmax) ? (src1->xmax) : (src2->xmax);
+	ymin = (src1->ymin) > (src2->ymin) ? (src1->ymin) : (src2->ymin);
+	ymax = (src1->ymax) < (src2->ymax) ? (src1->ymax) : (src2->ymax);
+	
+	if(xmax>=xmin && ymax>=ymin) {
+		if(dest) {
+			dest->xmin = xmin;
+			dest->xmax = xmax;
+			dest->ymin = ymin;
+			dest->ymax = ymax;
+		}
+		return 1;
+	}
+	else {
+		if(dest) {
+			dest->xmin = 0;
+			dest->xmax = 0;
+			dest->ymin = 0;
+			dest->ymax = 0;
+		}
+		return 0;
+	}
+}