mirror of
https://github.com/tesseract-ocr/tesseract.git
synced 2024-11-24 19:19:05 +08:00
694d3f2c20
git-svn-id: https://tesseract-ocr.googlecode.com/svn/trunk@291 d0cd1f9f-072b-0410-8dd7-cf729c803f20
121 lines
3.5 KiB
C++
121 lines
3.5 KiB
C++
/******************************************************************************
|
|
** Filename: xform2d.c
|
|
** Purpose: Library routines for performing 2D point transformations
|
|
** Author: Dan Johnson
|
|
** History: Fri Sep 22 09:54:17 1989, 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.
|
|
******************************************************************************/
|
|
/**----------------------------------------------------------------------------
|
|
Include Files and Type Defines
|
|
----------------------------------------------------------------------------**/
|
|
#include "xform2d.h"
|
|
#include <math.h>
|
|
|
|
/**----------------------------------------------------------------------------
|
|
Public Code
|
|
----------------------------------------------------------------------------**/
|
|
|
|
void InitMatrix(MATRIX_2D *M) {
|
|
M->a = 1;
|
|
M->b = 0;
|
|
M->c = 0;
|
|
M->d = 1;
|
|
M->tx = 0;
|
|
M->ty = 0;
|
|
}
|
|
|
|
void CopyMatrix(MATRIX_2D *A, MATRIX_2D *B) {
|
|
B->a = A->a;
|
|
B->b = A->b;
|
|
B->c = A->c;
|
|
B->d = A->d;
|
|
B->tx = A->tx;
|
|
B->ty = A->ty;
|
|
}
|
|
|
|
void TranslateMatrix(MATRIX_2D *M, FLOAT32 X, FLOAT32 Y) {
|
|
M->tx += M->a * X + M->c * Y;
|
|
M->ty += M->b * X + M->d * Y;
|
|
}
|
|
|
|
void ScaleMatrix(MATRIX_2D *M, FLOAT32 X, FLOAT32 Y) {
|
|
M->a *= X;
|
|
M->b *= X;
|
|
M->c *= Y;
|
|
M->d *= Y;
|
|
}
|
|
|
|
void MirrorMatrixInX(MATRIX_2D *M) {ScaleMatrix(M, -1, 1);}
|
|
void MirrorMatrixInY(MATRIX_2D *M) {ScaleMatrix(M, 1, -1);}
|
|
void MirrorMatrixInXY(MATRIX_2D *M) {ScaleMatrix(M, -1, -1);}
|
|
|
|
FLOAT32 MapX(MATRIX_2D *M, FLOAT32 X, FLOAT32 Y) {
|
|
return M->a * (X) + (M)->c * (Y) + (M)->tx;
|
|
}
|
|
|
|
FLOAT32 MapY(MATRIX_2D *M, FLOAT32 X, FLOAT32 Y) {
|
|
return M->b * X + M->d * Y + M->ty;
|
|
}
|
|
|
|
void MapPoint(MATRIX_2D *M, const FPOINT &A, FPOINT* B) {
|
|
B->x = MapX(M, A.x, A.y);
|
|
B->y = MapY(M, A.x, A.y);
|
|
}
|
|
|
|
FLOAT32 MapDx(MATRIX_2D *M, FLOAT32 DX, FLOAT32 DY) {
|
|
return M->a * DX + M->c * DY;
|
|
}
|
|
|
|
FLOAT32 MapDy(MATRIX_2D *M, FLOAT32 DX, FLOAT32 DY) {
|
|
return M->b * DX + M->d * DY;
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
void RotateMatrix(MATRIX_2D_PTR Matrix, FLOAT32 Angle) {
|
|
/*
|
|
** Parameters:
|
|
** Matrix transformation matrix to rotate
|
|
** Angle angle to rotate matrix
|
|
** Globals: none
|
|
** Operation:
|
|
** Rotate the coordinate system (as specified by Matrix) about
|
|
** its origin by Angle radians. In matrix notation the
|
|
** effect is as follows:
|
|
**
|
|
** Matrix = R X Matrix
|
|
**
|
|
** where R is the following matrix
|
|
**
|
|
** cos Angle sin Angle 0
|
|
** -sin Angle cos Angle 0
|
|
** 0 0 1
|
|
** Return: none
|
|
** Exceptions: none
|
|
** History: 7/27/89, DSJ, Create.
|
|
*/
|
|
FLOAT32 Cos, Sin;
|
|
FLOAT32 NewA, NewB;
|
|
|
|
Cos = cos ((double) Angle);
|
|
Sin = sin ((double) Angle);
|
|
|
|
NewA = Matrix->a * Cos + Matrix->c * Sin;
|
|
NewB = Matrix->b * Cos + Matrix->d * Sin;
|
|
Matrix->c = Matrix->a * -Sin + Matrix->c * Cos;
|
|
Matrix->d = Matrix->b * -Sin + Matrix->d * Cos;
|
|
Matrix->a = NewA;
|
|
Matrix->b = NewB;
|
|
|
|
} /* RotateMatrix */
|