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fpoint.cpp
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1 /******************************************************************************
2 ** Filename: fpoint.c
3 ** Purpose: Abstract data type for a 2D point (floating point coords)
4 ** Author: Dan Johnson
5 ** History: Thu Apr 12 10:44:15 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 ******************************************************************************/
21 #include "const.h"
22 #include "fpoint.h"
23 #include <stdio.h>
24 #include <math.h>
25
29 /*---------------------------------------------------------------------------*/
30
31 FLOAT32 DistanceBetween(FPOINT A, FPOINT B) {
32 double xd = XDelta(A, B);
33 double yd = YDelta(A, B);
34 return sqrt(static_cast<double>(xd * xd + yd * yd));
35 }
36
37
38
39 FLOAT32 NormalizedAngleFrom(FPOINT *Point1,
40 FPOINT *Point2,
41 FLOAT32 FullScale) {
42 /*
43 ** Parameters:
44 ** Point1, Point2 points to compute angle between
45 ** FullScale value to associate with 2*pi
46 ** Globals: none
47 ** Operation: Return the angle from Point1 to Point2 normalized to
48 ** lie in the range 0 to FullScale (where FullScale corresponds
49 ** to 2*pi or 360 degrees).
50 ** Return: none
51 ** Exceptions: none
52 ** History: Wed Mar 28 14:27:25 1990, DSJ, Created.
53 */
54 FLOAT32 Angle;
55 FLOAT32 NumRadsInCircle = 2.0 * PI;
56
57 Angle = AngleFrom (*Point1, *Point2);
58 if (Angle < 0.0)
59 Angle += NumRadsInCircle;
60 Angle *= FullScale / NumRadsInCircle;
61 if (Angle < 0.0 || Angle >= FullScale)
62 Angle = 0.0;
63 return (Angle);
64
65 } /* NormalizedAngleFrom */