tesseract  v4.0.0-17-g361f3264
Open Source OCR Engine
fpoint.h
1 /******************************************************************************
2  ** Filename: fpoint.h
3  ** Purpose: Abstract data type for 2D points (floating point coords)
4  ** Author: Dan Johnson
5  **
6  ** (c) Copyright Hewlett-Packard Company, 1988.
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 
19 #ifndef FPOINT_H
20 #define FPOINT_H
21 
25 #include <cmath>
26 #include <cstdio>
27 #include "host.h"
28 
29 /* define data structure to hold 2D points or vectors using floating point */
30 typedef struct {
31  float x, y;
32 } FPOINT;
33 using FVECTOR = FPOINT;
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), (double)XDelta(A, B)))
43 
44 #define XIntersectionOf(A, B, X) (SlopeFrom(A, B) * ((X)-A.x) + A.y)
45 
46 /*-------------------------------------------------------------------------
47  Public Function Prototypes
48 ---------------------------------------------------------------------------*/
49 
50 float DistanceBetween(FPOINT A, FPOINT B);
51 
52 float NormalizedAngleFrom(FPOINT* Point1, FPOINT* Point2, float FullScale);
53 
54 #endif
Definition: fpoint.h:30
float y
Definition: fpoint.h:31