C4BltTransform Class Reference

#include <C4BltTransform.h>

Inheritance diagram for C4BltTransform:

Public Member Functions
	C4BltTransform ()=default
void	Set (float fA, float fB, float fC, float fD, float fE, float fF, float fG, float fH, float fI)
void	SetRotate (float iAngle, float fOffX, float fOffY)
bool	SetAsInv (C4BltTransform &rOfTransform)
void	Rotate (float Angle, float fOffX, float fOffY)
void	SetMoveScale (float dx, float dy, float sx, float sy)
void	MoveScale (float dx, float dy, float sx, float sy)
void	ScaleAt (float sx, float sy, float tx, float ty)
C4BltTransform &	operator*= (const C4BltTransform &r)
void	TransformPoint (float &rX, float &rY) const

Public Attributes
float	mat [9]

Detailed Description

Definition at line 21 of file C4BltTransform.h.

Constructor & Destructor Documentation

C4BltTransform()

C4BltTransform::C4BltTransform ( )

default

Member Function Documentation

MoveScale()

void C4BltTransform::MoveScale ( float  dx, float  dy, float  sx, float  sy  )

inline

Definition at line 43 of file C4BltTransform.h.

    {
        // multiply matrix by movescale matrix
        C4BltTransform move; move.SetMoveScale(dx,dy,sx,sy);
        (*this) *= move;
    }

References SetMoveScale().

Referenced by ScaleAt().

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operator*=()

C4BltTransform& C4BltTransform::operator*= ( const C4BltTransform &  r )

inline

Definition at line 54 of file C4BltTransform.h.

    {
        // transform transformation
        Set(mat[0]*r.mat[0] + mat[3]*r.mat[1] + mat[6]*r.mat[2],
            mat[1]*r.mat[0] + mat[4]*r.mat[1] + mat[7]*r.mat[2],
            mat[2]*r.mat[0] + mat[5]*r.mat[1] + mat[8]*r.mat[2],
            mat[0]*r.mat[3] + mat[3]*r.mat[4] + mat[6]*r.mat[5],
            mat[1]*r.mat[3] + mat[4]*r.mat[4] + mat[7]*r.mat[5],
            mat[2]*r.mat[3] + mat[5]*r.mat[4] + mat[8]*r.mat[5],
            mat[0]*r.mat[6] + mat[3]*r.mat[7] + mat[6]*r.mat[8],
            mat[1]*r.mat[6] + mat[4]*r.mat[7] + mat[7]*r.mat[8],
            mat[2]*r.mat[6] + mat[5]*r.mat[7] + mat[8]*r.mat[8]);
        return *this;
    }

References mat, and Set().

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Rotate()

void C4BltTransform::Rotate ( float  Angle, float  fOffX, float  fOffY  )

inline

Definition at line 31 of file C4BltTransform.h.

    {
        // multiply matrix as seen in SetRotate by own matrix
        C4BltTransform rot; rot.SetRotate(Angle, fOffX, fOffY);
        (*this) *= rot;
    }

References Angle(), and SetRotate().

Referenced by C4Object::DrawActionFace(), and C4Object::DrawFace().

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ScaleAt()

void C4BltTransform::ScaleAt ( float  sx, float  sy, float  tx, float  ty  )

inline

Definition at line 49 of file C4BltTransform.h.

    {
        // scale and move back so tx and ty remain fixpoints
        MoveScale(-tx*(sx-1), -ty*(sy-1), sx, sy);
    }

References MoveScale().

Referenced by C4GraphicsOverlay::Draw().

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Set()

void C4BltTransform::Set ( float  fA, float  fB, float  fC, float  fD, float  fE, float  fF, float  fG, float  fH, float  fI  )

inline

Definition at line 27 of file C4BltTransform.h.

    { mat[0]=fA; mat[1]=fB; mat[2]=fC; mat[3]=fD; mat[4]=fE; mat[5]=fF; mat[6]=fG; mat[7]=fH; mat[8]=fI; }

References mat.

Referenced by C4Draw::BlitUnscaled(), operator*=(), C4DrawTransform::Set(), SetAsInv(), and C4DrawTransform::SetTransformAt().

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SetAsInv()

bool C4BltTransform::SetAsInv

(

C4BltTransform &

rOfTransform

)

Definition at line 42 of file C4BltTransform.cpp.

{
    // calc inverse of matrix
    float det = r.mat[0]*r.mat[4]*r.mat[8] + r.mat[1]*r.mat[5]*r.mat[6]
                + r.mat[2]*r.mat[3]*r.mat[7] - r.mat[2]*r.mat[4]*r.mat[6]
                - r.mat[0]*r.mat[5]*r.mat[7] - r.mat[1]*r.mat[3]*r.mat[8];
    if (!det) { Set(1,0,0,0,1,0,0,0,1); return false; }
    mat[0] = (r.mat[4] * r.mat[8] - r.mat[5] * r.mat[7]) / det;
    mat[1] = (r.mat[2] * r.mat[7] - r.mat[1] * r.mat[8]) / det;
    mat[2] = (r.mat[1] * r.mat[5] - r.mat[2] * r.mat[4]) / det;
    mat[3] = (r.mat[5] * r.mat[6] - r.mat[3] * r.mat[8]) / det;
    mat[4] = (r.mat[0] * r.mat[8] - r.mat[2] * r.mat[6]) / det;
    mat[5] = (r.mat[2] * r.mat[3] - r.mat[0] * r.mat[5]) / det;
    mat[6] = (r.mat[3] * r.mat[7] - r.mat[4] * r.mat[6]) / det;
    mat[7] = (r.mat[1] * r.mat[6] - r.mat[0] * r.mat[7]) / det;
    mat[8] = (r.mat[0] * r.mat[4] - r.mat[1] * r.mat[3]) / det;
    return true;
}

References mat, and Set().

Referenced by C4Draw::Blit8().

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SetMoveScale()

void C4BltTransform::SetMoveScale ( float  dx, float  dy, float  sx, float  sy  )

inline

Definition at line 37 of file C4BltTransform.h.

    {
        mat[0] = sx; mat[1] = 0;  mat[2] = dx;
        mat[3] = 0;  mat[4] = sy; mat[5] = dy;
        mat[6] = 0;  mat[7] = 0;  mat[8] = 1;
    }

References mat.

Referenced by C4Draw::Blit8(), and MoveScale().

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SetRotate()

void C4BltTransform::SetRotate	(	float	iAngle,
		float	fOffX,
		float	fOffY
	)

Definition at line 21 of file C4BltTransform.cpp.

{
    // iAngle is in degrees (cycling from 0 to 360)
    // determine sine and cos of reversed angle in radians
    // fAngle = -iAngle * pi/180 = iAngle * -pi/180
    float fAngle = iAngle * -0.0174532925f;
    float fsin = sinf(fAngle); float fcos = cosf(fAngle);
    // set matrix values
    mat[0] = +fcos; mat[1] = +fsin; mat[2] = (1-fcos)*fOffX - fsin*fOffY;
    mat[3] = -fsin; mat[4] = +fcos; mat[5] = (1-fcos)*fOffY + fsin*fOffX;
    mat[6] = 0; mat[7] = 0; mat[8] = 1;
    /*    calculation of rotation matrix:
      x2 = fcos*(x1-fOffX) + fsin*(y1-fOffY) + fOffX
         = fcos*x1 - fcos*fOffX + fsin*y1 - fsin*fOffY + fOffX
         = x1*fcos + y1*fsin + (1-fcos)*fOffX - fsin*fOffY
 
      y2 = -fsin*(x1-fOffX) + fcos*(y1-fOffY) + fOffY
         = x1*-fsin + fsin*fOffX + y1*fcos - fcos*fOffY + fOffY
         = x1*-fsin + y1*fcos + fsin*fOffX + (1-fcos)*fOffY */
}

References mat.

Referenced by C4Object::DrawActionFace(), C4Object::DrawFace(), C4GUI::Element::DrawHBarByVGfx(), C4Facet::DrawXR(), and Rotate().

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TransformPoint()

void C4BltTransform::TransformPoint	(	float &	rX,
		float &	rY
	)		const

Definition at line 61 of file C4BltTransform.cpp.

{
    // apply matrix
    float fW = mat[6] * rX + mat[7] * rY + mat[8];
    // store in temp, so original rX is used for calculation of rY
    float fX = (mat[0] * rX + mat[1] * rY + mat[2]) / fW;
    rY = (mat[3] * rX + mat[4] * rY + mat[5]) / fW;
    rX = fX; // apply temp
}

References mat.

Referenced by C4Draw::Blit8().

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Member Data Documentation

mat

float C4BltTransform::mat[9]

Definition at line 24 of file C4BltTransform.h.

Referenced by C4MarkupTagItalic::Apply(), C4Draw::BlitUnscaled(), C4DrawTransform::CompileFunc(), CStdFont::DrawText(), C4DrawTransform::GetXOffset(), C4DrawTransform::GetYOffset(), C4DrawTransform::IsIdentity(), operator*=(), C4DrawTransform::operator==(), Set(), SetAsInv(), C4DrawTransform::SetFlipDir(), SetMoveScale(), SetRotate(), C4DrawTransform::SetTransformAt(), CStdGL::SetupMultiBlt(), and TransformPoint().

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The documentation for this class was generated from the following files:

• C4BltTransform.h
• C4BltTransform.cpp
• C4Draw.cpp