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70 lines
2.8 KiB
C
70 lines
2.8 KiB
C
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/******************************************************************************
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** Filename: xform2d.h
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** Purpose: Definitions for using 2D point transformation library
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** Author: Dan Johnson
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** History: Fri Sep 22 09:57:08 1989, DSJ, Created.
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**
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** (c) Copyright Hewlett-Packard Company, 1988.
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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** http://www.apache.org/licenses/LICENSE-2.0
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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******************************************************************************/
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#ifndef XFORM2D_H
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#define XFORM2D_H
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/**----------------------------------------------------------------------------
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Include Files and Type Defines
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----------------------------------------------------------------------------**/
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#include "fpoint.h"
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typedef struct
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{
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FLOAT32 a, b, c, d, tx, ty;
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}
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MATRIX_2D, *MATRIX_2D_PTR;
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/**----------------------------------------------------------------------------
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Macros
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----------------------------------------------------------------------------**/
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/* macros for initializing transform matrices */
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#define InitMatrix(M) ((M)->a = 1, (M)->b = 0, \
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(M)->c = 0, (M)->d = 1, \
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(M)->tx = 0, (M)->ty = 0 )
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#define CopyMatrix(A,B) ((B)->a = (A)->a, (B)->b = (A)->b, \
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(B)->c = (A)->c, (B)->d = (A)->d, \
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(B)->tx = (A)->tx, (B)->ty = (A)->ty)
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/* matrix scaling, translation, rotation, mirroring, etc.*/
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#define TranslateMatrix(M,X,Y) ((M)->tx += (M)->a * (X) + (M)->c * (Y), \
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(M)->ty += (M)->b * (X) + (M)->d * (Y) )
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#define ScaleMatrix(M,X,Y) ((M)->a *= (X), (M)->b *= (X), \
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(M)->c *= (Y), (M)->d *= (Y))
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#define MirrorMatrixInX(M) (ScaleMatrix((M),-1,1))
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#define MirrorMatrixInY(M) (ScaleMatrix((M),1,-1))
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#define MirrorMatrixInXY(M) (ScaleMatrix((M),-1,-1))
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/* using a matrix to map points*/
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#define MapX(M,X,Y) ((M)->a * (X) + (M)->c * (Y) + (M)->tx)
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#define MapY(M,X,Y) ((M)->b * (X) + (M)->d * (Y) + (M)->ty)
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#define MapPoint(M,A,B) (Xof(B) = MapX (M, Xof(A), Yof(A)), \
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Yof(B) = MapY (M, Xof(A), Yof(A)))
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#define MapDx(M,DX,DY) ((M)->a * (DX) + (M)->c * (DY))
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#define MapDy(M,DX,DY) ((M)->b * (DX) + (M)->d * (DY))
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/**----------------------------------------------------------------------------
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Public Function Prototypes
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----------------------------------------------------------------------------**/
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void RotateMatrix(MATRIX_2D_PTR Matrix, FLOAT32 Angle);
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#endif
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