gecko-dev/gfx/public/nsTransform2D.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#ifndef nsTransform2D_h___
#define nsTransform2D_h___
#include "nscore.h"
#include "nsCoord.h"
#include "nsUnitConversion.h"
#define MG_2DIDENTITY 0
#define MG_2DTRANSLATION 1
#define MG_2DSCALE 2
#define MG_2DGENERAL 4
class NS_GFX nsTransform2D
{
private:
//accelerators
float m00, m01, m10, m11, m20, m21;
PRUint16 type;
public:
//constructors
nsTransform2D(void) { SetToIdentity(); }
nsTransform2D(nsTransform2D *aTransform2D) { SetMatrix(aTransform2D); }
//destructor
~nsTransform2D(void) { }
/**
* get the type of this transform
*
* @param
* @return type from above set
* @exception
* @author michaelp 09-25-97 1:56pm
**/
PRUint16 GetType(void) { return type; }
/**
* set this transform to identity
*
* @param
* @exception
* @author michaelp 09-25-97 1:56pm
**/
void SetToIdentity(void) { m01 = m10 = m20 = m21 = 0.0f; m00 = m11 = 1.0f; type = MG_2DIDENTITY; }
/**
* set this transform to a scale
*
* @param sx, x scale
* @param sy, y scale
* @exception
* @author michaelp 09-25-97 1:56pm
**/
void SetToScale(float sx, float sy);
/**
* set this transform to a translation
*
* @param tx, x translation
* @param ty, y translation
* @exception
* @author michaelp 09-25-97 1:56pm
**/
void SetToTranslate(float tx, float ty);
/**
* get the translation portion of this transform
*
* @param pt, Point to return translation values in
* @exception
* @author michaelp 09-25-97 1:56pm
**/
void GetTranslation(float *ptX, float *ptY) { *ptX = m20; *ptY = m21; }
void GetTranslationCoord(nscoord *ptX, nscoord *ptY) { *ptX = NSToCoordRound(m20); *ptY = NSToCoordRound(m21); }
/**
* get the X translation portion of this transform
*
* @param
* @returns x component of translation
* @exception
**/
float GetXTranslation(void) { return m20; }
nscoord GetXTranslationCoord(void) { return NSToCoordRound(m20); }
/**
* get the Y translation portion of this transform
*
* @param
* @returns y component of translation
* @exception
**/
float GetYTranslation(void) { return m21; }
nscoord GetYTranslationCoord(void) { return NSToCoordRound(m21); }
/**
* set this matrix and type from another Transform2D
*
* @param aTransform2D is the Transform2D to be copied from
* @exception
* @author michaelp 09-25-97 1:56pm
**/
void SetMatrix(nsTransform2D *aTransform2D);
/**
* post-multiply a new Transform
*
* @param newxform new Transform2D
* @exception
* @author michaelp 09-25-97 1:56pm
**/
void Concatenate(nsTransform2D *newxform);
/**
* pre-multiply a new Transform
*
* @param newxform new Transform2D
* @exception
* @author michaelp 09-25-97 1:56pm
**/
void PreConcatenate(nsTransform2D *newxform);
/**
* apply nontranslation portion of matrix to vector
*
* @param pt Point to transform
* @exception
* @author michaelp 09-25-97 1:56pm
**/
void TransformNoXLate(float *ptX, float *ptY);
void TransformNoXLateCoord(nscoord *ptX, nscoord *ptY);
/**
* apply matrix to vector
*
* @param pt Point to transform
* @exception
* @author michaelp 09-25-97 1:56pm
**/
void Transform(float *ptX, float *ptY);
void TransformCoord(nscoord *ptX, nscoord *ptY);
/**
* apply matrix to rect
*
* @param rect Rect to transform
* @exception
* @author michaelp 09-25-97 1:56pm
**/
void Transform(float *aX, float *aY, float *aWidth, float *aHeight);
void TransformCoord(nscoord *aX, nscoord *aY, nscoord *aWidth, nscoord *aHeight);
/**
* Scale an array of X/Y coordinates by the X/Y scale factor in the
* matrix. The scale is done as if the other coordinate were zero.
*
* @param aSrc Base of coordinate input array
* @param aDst Base of coordinate output array
* @param aNumCoords Number of coordinates to scale
*/
void ScaleXCoords(const nscoord* aSrc, PRUint32 aNumCoords, PRIntn* aDst);
void ScaleYCoords(const nscoord* aSrc, PRUint32 aNumCoords, PRIntn* aDst);
/**
* add a translation to a Transform via x, y pair
*
* @param ptX x value to add as x translation
* @param ptY y value to add as y translation
* @exception
* @author michaelp 09-25-97 1:56pm
**/
void AddTranslation(float ptX, float ptY);
/**
* add a scale to a Transform via x, y pair
*
* @param ptX x value to add as x scale
* @param ptY y value to add as y scale
* @exception
* @author michaelp 09-25-97 1:56pm
**/
void AddScale(float ptX, float ptY);
};
#endif