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264 lines
7.2 KiB
C++
264 lines
7.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsTransform2D_h___
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#define nsTransform2D_h___
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#include "gfxCore.h"
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#include "nsCoord.h"
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#include "nsUnitConversion.h"
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#define MG_2DIDENTITY 0
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#define MG_2DTRANSLATION 1
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#define MG_2DSCALE 2
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class NS_GFX nsTransform2D
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{
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private:
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/**
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* This represents the following matrix (note that the order of row/column
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* indices is opposite to usual notation)
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*
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* / m00 0 m20 \
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* M = | 0 m11 m21 |
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* \ 0 0 1 /
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*
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* Transformation of a coordinate (x, y) is obtained by setting
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* v = (x, y, 1)^T and evaluating M . v
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**/
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float m00, m11, m20, m21;
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PRUint16 type;
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public:
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nsTransform2D(void) { SetToIdentity(); }
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nsTransform2D(nsTransform2D *aTransform2D) { SetMatrix(aTransform2D); }
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~nsTransform2D(void) { }
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/**
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* get the type of this transform
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*
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* @param
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* @return type from above set
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* @exception
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* @author michaelp 09-25-97 1:56pm
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**/
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PRUint16 GetType(void) const { return type; }
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/**
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* set this transform to identity
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*
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* @param
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* @exception
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* @author michaelp 09-25-97 1:56pm
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**/
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void SetToIdentity(void) { m20 = m21 = 0.0f; m00 = m11 = 1.0f; type = MG_2DIDENTITY; }
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/**
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* set this transform to a scale
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*
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* @param sx, x scale
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* @param sy, y scale
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* @exception
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* @author michaelp 09-25-97 1:56pm
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**/
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void SetToScale(float sx, float sy) { m00 = sx; m11 = sy; m20 = m21 = 0.0f; type = MG_2DSCALE; }
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/**
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* set this transform to a translation
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*
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* @param tx, x translation
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* @param ty, y translation
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* @exception
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* @author michaelp 09-25-97 1:56pm
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**/
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void SetToTranslate(float tx, float ty) { m00 = m11 = 1.0f; m20 = tx; m21 = ty; type = MG_2DTRANSLATION; }
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/**
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* get the translation portion of this transform
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*
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* @param pt, Point to return translation values in
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* @exception
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* @author michaelp 09-25-97 1:56pm
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**/
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void GetTranslation(float *ptX, float *ptY) const { *ptX = m20; *ptY = m21; }
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void GetTranslationCoord(nscoord *ptX, nscoord *ptY) const { *ptX = NSToCoordRound(m20); *ptY = NSToCoordRound(m21); }
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/**
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* set the translation portion of this transform
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*
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* @param tx, x translation
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* @param ty, y translation
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* @exception
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**/
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void SetTranslation(float tX, float tY) {
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m20 = tX;
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m21 = tY;
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type |= MG_2DTRANSLATION;
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}
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/**
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* get the X translation portion of this transform
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*
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* @param
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* @returns x component of translation
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* @exception
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**/
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float GetXTranslation(void) const { return m20; }
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nscoord GetXTranslationCoord(void) const { return NSToCoordRound(m20); }
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/**
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* get the Y translation portion of this transform
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*
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* @param
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* @returns y component of translation
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* @exception
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**/
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float GetYTranslation(void) const { return m21; }
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nscoord GetYTranslationCoord(void) const { return NSToCoordRound(m21); }
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/**
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* set this matrix and type from another Transform2D
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*
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* @param aTransform2D is the Transform2D to be copied from
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* @exception
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* @author michaelp 09-25-97 1:56pm
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**/
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void SetMatrix(nsTransform2D *aTransform2D);
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/**
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* post-multiply a new Transform
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*
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* @param newxform new Transform2D
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* @exception
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* @author michaelp 09-25-97 1:56pm
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**/
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void Concatenate(nsTransform2D *newxform);
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/**
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* pre-multiply a new Transform
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*
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* @param newxform new Transform2D
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* @exception
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* @author michaelp 09-25-97 1:56pm
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**/
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void PreConcatenate(nsTransform2D *newxform);
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/**
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* apply nontranslation portion of matrix to vector
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*
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* @param pt Point to transform
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* @exception
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* @author michaelp 09-25-97 1:56pm
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**/
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void TransformNoXLate(float *ptX, float *ptY) const;
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void TransformNoXLateCoord(nscoord *ptX, nscoord *ptY) const;
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/**
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* apply matrix to vector
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*
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* @param pt Point to transform
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* @exception
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* @author michaelp 09-25-97 1:56pm
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**/
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void Transform(float *ptX, float *ptY) const;
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void TransformCoord(nscoord *ptX, nscoord *ptY) const;
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/**
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* apply matrix to rect
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*
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* @param rect Rect to transform
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* @exception
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* @author michaelp 09-25-97 1:56pm
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**/
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void Transform(float *aX, float *aY, float *aWidth, float *aHeight) const;
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void TransformCoord(nscoord *aX, nscoord *aY, nscoord *aWidth, nscoord *aHeight) const;
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void TransformNoXLateCoord(nscoord *aX, nscoord *aY, nscoord *aWidth, nscoord *aHeight) const;
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/**
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* Scale an array of X/Y coordinates by the X/Y scale factor in the
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* matrix. The scale is done as if the other coordinate were zero.
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*
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* @param aSrc Base of coordinate input array
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* @param aDst Base of coordinate output array
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* @param aNumCoords Number of coordinates to scale
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*/
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void ScaleXCoords(const nscoord* aSrc, PRUint32 aNumCoords, PRIntn* aDst) const;
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void ScaleYCoords(const nscoord* aSrc, PRUint32 aNumCoords, PRIntn* aDst) const;
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/**
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* add a translation to a Transform via x, y pair
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*
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* @param ptX x value to add as x translation
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* @param ptY y value to add as y translation
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* @exception
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* @author michaelp 09-25-97 1:56pm
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**/
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void AddTranslation(float ptX, float ptY);
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/**
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* add a scale to a Transform via x, y pair
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*
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* @param ptX x value to add as x scale
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* @param ptY y value to add as y scale
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* @exception
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* @author michaelp 09-25-97 1:56pm
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**/
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void AddScale(float ptX, float ptY);
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};
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#endif
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