fpoint.h
Go to the documentation of this file.
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.
9  ** you may not use this file except in compliance with the License.
10  ** You may obtain a copy of the License at
12  ** Unless required by applicable law or agreed to in writing, software
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
24 #include "host.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
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
52
53 FLOAT32 NormalizedAngleFrom(FPOINT *Point1, FPOINT *Point2, FLOAT32 FullScale);
54 #endif
float FLOAT32
Definition: host.h:111
Definition: fpoint.h:29
FPOINT FVECTOR
Definition: fpoint.h:33
FLOAT32 y
Definition: fpoint.h:31
FLOAT32 DistanceBetween(FPOINT A, FPOINT B)
Definition: fpoint.cpp:30
FLOAT32 NormalizedAngleFrom(FPOINT *Point1, FPOINT *Point2, FLOAT32 FullScale)
Definition: fpoint.cpp:48