classify/xform2d.h File Reference

#include "fpoint.h"

Go to the source code of this file.

Classes

• struct MATRIX_2D

  2D matrix of floats More...
  

Defines

• #define CopyMatrix(A, B)
• #define InitMatrix(M)
• #define MapDx(M, DX, DY)   ((M)->a * (DX) + (M)->c * (DY))
• #define MapDy(M, DX, DY)   ((M)->b * (DX) + (M)->d * (DY))
• #define MapPoint(M, A, B)
• #define MapX(M, X, Y)   ((M)->a * (X) + (M)->c * (Y) + (M)->tx)
• #define MapY(M, X, Y)   ((M)->b * (X) + (M)->d * (Y) + (M)->ty)
• #define MirrorMatrixInX(M)   (ScaleMatrix((M),-1,1))
• #define MirrorMatrixInXY(M)   (ScaleMatrix((M),-1,-1))
• #define MirrorMatrixInY(M)   (ScaleMatrix((M),1,-1))
• #define ScaleMatrix(M, X, Y)
• #define TranslateMatrix(M, X, Y)

Typedefs

• typedef struct MATRIX_2D * MATRIX_2D_PTR

Functions

• void RotateMatrix (MATRIX_2D_PTR Matrix, FLOAT32 Angle)

  Rotate the coordinate system (as specified by Matrix) about its origin by Angle radians.
  

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Define Documentation

#define CopyMatrix	(	A,
		B		)

Value:

((B)->a = (A)->a, (B)->b = (A)->b,  \
            (B)->c = (A)->c, (B)->d = (A)->d,   \
            (B)->tx = (A)->tx, (B)->ty = (A)->ty)

copy values from one transform matrics to another

Definition at line 49 of file xform2d.h.

#define InitMatrix

(

M

)

Value:

((M)->a = 1, (M)->b = 0,      \
            (M)->c = 0, (M)->d = 1,    \
            (M)->tx = 0, (M)->ty = 0 )

initialize transform matrices

Definition at line 44 of file xform2d.h.

Referenced by ComputeBulges().

#define MapDx	(	M,
		DX,
		DY		)	((M)->a * (DX) + (M)->c * (DY))

Definition at line 75 of file xform2d.h.

#define MapDy	(	M,
		DX,
		DY		)	((M)->b * (DX) + (M)->d * (DY))

Definition at line 76 of file xform2d.h.

#define MapPoint	(	M,
		A,
		B		)

Value:

(Xof(B) = MapX (M, Xof(A), Yof(A)), \
            Yof(B) = MapY (M, Xof(A), Yof(A)))

Definition at line 73 of file xform2d.h.

Referenced by ComputeBulges().

#define MapX	(	M,
		X,
		Y		)	((M)->a * (X) + (M)->c * (Y) + (M)->tx)

using a matrix to map points, X

Definition at line 69 of file xform2d.h.

#define MapY	(	M,
		X,
		Y		)	((M)->b * (X) + (M)->d * (Y) + (M)->ty)

using a matrix to map points, Y

Definition at line 71 of file xform2d.h.

#define MirrorMatrixInX

(

M

)

(ScaleMatrix((M),-1,1))

matrix mirroring in X

Definition at line 62 of file xform2d.h.

#define MirrorMatrixInXY

(

M

)

(ScaleMatrix((M),-1,-1))

matrix mirroring in XY

Definition at line 66 of file xform2d.h.

#define MirrorMatrixInY

(

M

)

(ScaleMatrix((M),1,-1))

matrix mirroring in Y

Definition at line 64 of file xform2d.h.

#define ScaleMatrix	(	M,
		X,
		Y		)

Value:

((M)->a *= (X), (M)->b *= (X),      \
            (M)->c *= (Y), (M)->d *= (Y))

matrix scaling

Definition at line 58 of file xform2d.h.

#define TranslateMatrix	(	M,
		X,
		Y		)

Value:

((M)->tx += (M)->a * (X) + (M)->c * (Y),  \
            (M)->ty += (M)->b * (X) + (M)->d * (Y) )

matrix translation

Definition at line 54 of file xform2d.h.

Referenced by ComputeBulges().

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Typedef Documentation

typedef struct MATRIX_2D * MATRIX_2D_PTR

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Function Documentation

void RotateMatrix	(	MATRIX_2D_PTR	Matrix,
		FLOAT32	Angle
	)

Rotate the coordinate system (as specified by Matrix) about its origin by Angle radians.

Parameters:

	Matrix	Transformation matrix to rotate
	Angle	Angle to rotate matrix

Returns:

none (Matrix is modified)

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

Note:

Exceptions: none

Date:

7/27/89, DSJ, Create.

Definition at line 51 of file xform2d.cpp.

Referenced by ComputeBulges().

                                                       { 
  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 */

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