1 /****************************************************************************** 2 ** Filename: fpoint.h 3 ** Purpose: Abstract data type for 2D points (floating point coords) 4 ** Author: Dan Johnson 5 ** History: Thu Apr 12 10:50:01 1990, DSJ, Created. 6 ** 7 ** (c) Copyright Hewlett-Packard Company, 1988. 8 ** Licensed under the Apache License, Version 2.0 (the "License"); 9 ** you may not use this file except in compliance with the License. 10 ** You may obtain a copy of the License at 11 ** http://www.apache.org/licenses/LICENSE-2.0 12 ** Unless required by applicable law or agreed to in writing, software 13 ** distributed under the License is distributed on an "AS IS" BASIS, 14 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 ** See the License for the specific language governing permissions and 16 ** limitations under the License. 17 ******************************************************************************/ 18 #ifndef FPOINT_H 19 #define FPOINT_H 20 21 /**---------------------------------------------------------------------------- 22 Include Files and Type Defines 23 ----------------------------------------------------------------------------**/ 24 #include "general.h" 25 #include <stdio.h> 26 #include <math.h> 27 28 /* define data structure to hold 2D points or vectors using floating point */ 29 typedef struct 30 { 31 FLOAT32 x, y; 32 } FPOINT; 33 typedef FPOINT FVECTOR; 34 35 /**---------------------------------------------------------------------------- 36 Macros 37 ----------------------------------------------------------------------------**/ 38 /* macros for computing miscellaneous functions of 2 points */ 39 #define XDelta(A,B) ( (B).x - (A).x ) 40 #define YDelta(A,B) ( (B).y - (A).y ) 41 #define SlopeFrom(A,B) ( YDelta(A,B) / XDelta(A,B) ) 42 #define AngleFrom(A,B) ( atan2((double) YDelta(A,B), \ 43 (double) XDelta(A,B) ) ) 44 45 #define XIntersectionOf(A,B,X) ( SlopeFrom(A,B) * ((X) - A.x) + A.y) 46 47 /*------------------------------------------------------------------------- 48 Public Function Prototypes 49 ---------------------------------------------------------------------------*/ 50 51 FLOAT32 DistanceBetween(FPOINT A, FPOINT B); 52 53 FLOAT32 NormalizedAngleFrom(FPOINT *Point1, FPOINT *Point2, FLOAT32 FullScale); 54 #endif 55