00001 /* Author: Geoff Leach, Department of Computer Science, RMIT. 00002 * email: gl@cs.rmit.edu.au 00003 * 00004 * Date: 6/10/93 00005 * 00006 * Version 1.0 00007 * 00008 * Copyright (c) RMIT 1993. All rights reserved. 00009 * 00010 * License to copy and use this software purposes is granted provided 00011 * that appropriate credit is given to both RMIT and the author. 00012 * 00013 * License is also granted to make and use derivative works provided 00014 * that appropriate credit is given to both RMIT and the author. 00015 * 00016 * RMIT makes no representations concerning either the merchantability 00017 * of this software or the suitability of this software for any particular 00018 * purpose. It is provided "as is" without express or implied warranty 00019 * of any kind. 00020 * 00021 * These notices must be retained in any copies of any part of this software. 00022 */ 00023 00024 #define Vector(p1,p2,u,v) (u = p2->x - p1->x, v = p2->y - p1->y) 00025 00026 #define Cross_product_2v(u1,v1,u2,v2) (u1 * v2 - v1 * u2) 00027 00028 #define Cross_product_3p(p1,p2,p3) ((p2->x - p1->x) * (p3->y - p1->y) - (p2->y - p1->y) * (p3->x - p1->x)) 00029 00030 #define Dot_product_2v(u1,v1,u2,v2) (u1 * u2 + v1 * v2)
1.4.6