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nsTransform2D.h
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00037 
00038 #ifndef nsTransform2D_h___
00039 #define nsTransform2D_h___
00040 
00041 #include "gfxCore.h"
00042 #include "nsCoord.h"
00043 #include "nsUnitConversion.h"
00044 
00045 #define MG_2DIDENTITY     0
00046 #define MG_2DTRANSLATION  1
00047 #define MG_2DSCALE        2
00048 #define MG_2DGENERAL      4
00049 
00050 class NS_GFX nsTransform2D
00051 {
00052 private:
00053   //accelerators
00054 
00055   float     m00, m01, m10, m11, m20, m21;
00056   PRUint16  type;
00057 
00058 public:
00059   //constructors
00060 
00061   nsTransform2D(void)                         { SetToIdentity(); }
00062   nsTransform2D(nsTransform2D *aTransform2D)  { SetMatrix(aTransform2D); }
00063 
00064   //destructor
00065 
00066   ~nsTransform2D(void)                        { }
00067 
00077   PRUint16 GetType(void)                      { return type; }
00078 
00087   void SetToIdentity(void)                    { m01 = m10 = m20 = m21 = 0.0f; m00 = m11 = 1.0f; type = MG_2DIDENTITY; }
00088 
00098   void SetToScale(float sx, float sy);
00099 
00109   void SetToTranslate(float tx, float ty);
00110 
00119   void GetTranslation(float *ptX, float *ptY) { *ptX = m20; *ptY = m21; }
00120   void GetTranslationCoord(nscoord *ptX, nscoord *ptY) { *ptX = NSToCoordRound(m20); *ptY = NSToCoordRound(m21); }
00121 
00130   void SetTranslation(float tX, float tY) {
00131     m20 = tX;
00132     m21 = tY;
00133     type |= MG_2DTRANSLATION;
00134   }
00135 
00144   float GetXTranslation(void)                 { return m20; }
00145   nscoord GetXTranslationCoord(void)          { return NSToCoordRound(m20); }
00146 
00155   float GetYTranslation(void)               { return m21; }
00156   nscoord GetYTranslationCoord(void)        { return NSToCoordRound(m21); }
00157 
00166   void SetMatrix(nsTransform2D *aTransform2D);
00167 
00176   void Concatenate(nsTransform2D *newxform);
00177 
00186   void PreConcatenate(nsTransform2D *newxform);
00187 
00196   void TransformNoXLate(float *ptX, float *ptY);
00197   void TransformNoXLateCoord(nscoord *ptX, nscoord *ptY);
00198 
00207   void Transform(float *ptX, float *ptY);
00208   void TransformCoord(nscoord *ptX, nscoord *ptY);
00209 
00218   void Transform(float *aX, float *aY, float *aWidth, float *aHeight);
00219   void TransformCoord(nscoord *aX, nscoord *aY, nscoord *aWidth, nscoord *aHeight);
00220 
00229   void ScaleXCoords(const nscoord* aSrc, PRUint32 aNumCoords, PRIntn* aDst);
00230   void ScaleYCoords(const nscoord* aSrc, PRUint32 aNumCoords, PRIntn* aDst);
00231 
00241   void AddTranslation(float ptX, float ptY);
00242 
00252   void AddScale(float ptX, float ptY);
00253 
00254 private:
00255   nscoord ToCoordRound(float aCoord);
00256 };
00257 
00258 #endif