| /****************************************************************************** |
| ** Filename: fpoint.h |
| ** Purpose: Abstract data type for 2D points (floating point coords) |
| ** Author: Dan Johnson |
| ** History: Thu Apr 12 10:50:01 1990, DSJ, Created. |
| ** |
| ** (c) Copyright Hewlett-Packard Company, 1988. |
| ** Licensed under the Apache License, Version 2.0 (the "License"); |
| ** you may not use this file except in compliance with the License. |
| ** You may obtain a copy of the License at |
| ** http://www.apache.org/licenses/LICENSE-2.0 |
| ** Unless required by applicable law or agreed to in writing, software |
| ** distributed under the License is distributed on an "AS IS" BASIS, |
| ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| ** See the License for the specific language governing permissions and |
| ** limitations under the License. |
| ******************************************************************************/ |
| #ifndef FPOINT_H |
| #define FPOINT_H |
| |
| /**---------------------------------------------------------------------------- |
| Include Files and Type Defines |
| ----------------------------------------------------------------------------**/ |
| #include "general.h" |
| #include <stdio.h> |
| #include <math.h> |
| |
| /* define data structure to hold 2D points or vectors using floating point */ |
| typedef struct |
| { |
| FLOAT32 x, y; |
| } FPOINT; |
| typedef FPOINT FVECTOR; |
| |
| /**---------------------------------------------------------------------------- |
| Macros |
| ----------------------------------------------------------------------------**/ |
| /* macros for computing miscellaneous functions of 2 points */ |
| #define XDelta(A,B) ( (B).x - (A).x ) |
| #define YDelta(A,B) ( (B).y - (A).y ) |
| #define SlopeFrom(A,B) ( YDelta(A,B) / XDelta(A,B) ) |
| #define AngleFrom(A,B) ( atan2((double) YDelta(A,B), \ |
| (double) XDelta(A,B) ) ) |
| |
| #define XIntersectionOf(A,B,X) ( SlopeFrom(A,B) * ((X) - A.x) + A.y) |
| |
| /*------------------------------------------------------------------------- |
| Public Function Prototypes |
| ---------------------------------------------------------------------------*/ |
| |
| FLOAT32 DistanceBetween(FPOINT A, FPOINT B); |
| |
| FLOAT32 NormalizedAngleFrom(FPOINT *Point1, FPOINT *Point2, FLOAT32 FullScale); |
| #endif |