graphics.cpp

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    m_matrix = CGAffineTransformMake(a,b,c,d,tx,ty);
}

// gets the component valuess of the matrix
void wxMacCoreGraphicsMatrixData::Get(wxDouble* a, wxDouble* b,  wxDouble* c,
                                      wxDouble* d, wxDouble* tx, wxDouble* ty) const
{
    if (a)  *a = m_matrix.a;
    if (b)  *b = m_matrix.b;
    if (c)  *c = m_matrix.c;
    if (d)  *d = m_matrix.d;
    if (tx) *tx= m_matrix.tx;
    if (ty) *ty= m_matrix.ty;
}

// makes this the inverse matrix
void wxMacCoreGraphicsMatrixData::Invert()
{
    m_matrix = CGAffineTransformInvert( m_matrix );
}

// returns true if the elements of the transformation matrix are equal ?
bool wxMacCoreGraphicsMatrixData::IsEqual( const wxGraphicsMatrixData* t) const
{
    const CGAffineTransform* tm = (CGAffineTransform*) t->GetNativeMatrix();
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_4
    if ( CGAffineTransformEqualToTransform!=NULL )
    {
        return CGAffineTransformEqualToTransform(m_matrix, *((CGAffineTransform*) t->GetNativeMatrix()));
    }
    else
#endif
    {
        return (
            m_matrix.a == tm->a &&
            m_matrix.b == tm->b &&
            m_matrix.c == tm->c &&
            m_matrix.d == tm->d &&
            m_matrix.tx == tm->tx &&
            m_matrix.ty == tm->ty ) ;
    }
}

// return true if this is the identity matrix
bool wxMacCoreGraphicsMatrixData::IsIdentity() const
{
    return ( m_matrix.a == 1 && m_matrix.d == 1 &&
        m_matrix.b == 0 && m_matrix.d == 0 && m_matrix.tx == 0 && m_matrix.ty == 0);
}

//
// transformation
//

// add the translation to this matrix
void wxMacCoreGraphicsMatrixData::Translate( wxDouble dx , wxDouble dy )
{
    m_matrix = CGAffineTransformTranslate( m_matrix, dx, dy);
}

// add the scale to this matrix
void wxMacCoreGraphicsMatrixData::Scale( wxDouble xScale , wxDouble yScale )
{
    m_matrix = CGAffineTransformScale( m_matrix, xScale, yScale);
}

// add the rotation to this matrix (radians)
void wxMacCoreGraphicsMatrixData::Rotate( wxDouble angle )
{
    m_matrix = CGAffineTransformRotate( m_matrix, angle);
}

//
// apply the transforms
//

// applies that matrix to the point
void wxMacCoreGraphicsMatrixData::TransformPoint( wxDouble *x, wxDouble *y ) const
{
    CGPoint pt = CGPointApplyAffineTransform( CGPointMake(*x,*y), m_matrix);

    *x = pt.x;
    *y = pt.y;
}

// applies the matrix except for translations
void wxMacCoreGraphicsMatrixData::TransformDistance( wxDouble *dx, wxDouble *dy ) const
{
    CGSize sz = CGSizeApplyAffineTransform( CGSizeMake(*dx,*dy) , m_matrix );
    *dx = sz.width;
    *dy = sz.height;
}

// returns the native representation
void * wxMacCoreGraphicsMatrixData::GetNativeMatrix() const
{
    return (void*) &m_matrix;
}

//
// Graphics Path
//

//-----------------------------------------------------------------------------
// wxMacCoreGraphicsPath declaration
//-----------------------------------------------------------------------------

class WXDLLEXPORT wxMacCoreGraphicsPathData : public wxGraphicsPathData
{
public :
    wxMacCoreGraphicsPathData( wxGraphicsRenderer* renderer, CGMutablePathRef path = NULL);

    ~wxMacCoreGraphicsPathData();

    virtual wxGraphicsObjectRefData *Clone() const;

    // begins a new subpath at (x,y)
    virtual void MoveToPoint( wxDouble x, wxDouble y );

    // adds a straight line from the current point to (x,y)
    virtual void AddLineToPoint( wxDouble x, wxDouble y );

    // adds a cubic Bezier curve from the current point, using two control points and an end point
    virtual void AddCurveToPoint( wxDouble cx1, wxDouble cy1, wxDouble cx2, wxDouble cy2, wxDouble x, wxDouble y );

    // closes the current sub-path
    virtual void CloseSubpath();

    // gets the last point of the current path, (0,0) if not yet set
    virtual void GetCurrentPoint( wxDouble* x, wxDouble* y) const;

    // adds an arc of a circle centering at (x,y) with radius (r) from startAngle to endAngle
    virtual void AddArc( wxDouble x, wxDouble y, wxDouble r, wxDouble startAngle, wxDouble endAngle, bool clockwise );

    //
    // These are convenience functions which - if not available natively will be assembled
    // using the primitives from above
    //

    // adds a quadratic Bezier curve from the current point, using a control point and an end point
    virtual void AddQuadCurveToPoint( wxDouble cx, wxDouble cy, wxDouble x, wxDouble y );

    // appends a rectangle as a new closed subpath
    virtual void AddRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h );

    // appends an ellipsis as a new closed subpath fitting the passed rectangle
    virtual void AddCircle( wxDouble x, wxDouble y, wxDouble r );

    // draws a an arc to two tangents connecting (current) to (x1,y1) and (x1,y1) to (x2,y2), also a straight line from (current) to (x1,y1)
    virtual void AddArcToPoint( wxDouble x1, wxDouble y1 , wxDouble x2, wxDouble y2, wxDouble r );

    // adds another path
    virtual void AddPath( const wxGraphicsPathData* path );

    // returns the native path
    virtual void * GetNativePath() const { return m_path; }

    // give the native path returned by GetNativePath() back (there might be some deallocations necessary)
    virtual void UnGetNativePath(void *p) const {}

    // transforms each point of this path by the matrix
    virtual void Transform( const wxGraphicsMatrixData* matrix );

    // gets the bounding box enclosing all points (possibly including control points)
    virtual void GetBox(wxDouble *x, wxDouble *y, wxDouble *w, wxDouble *y) const;

    virtual bool Contains( wxDouble x, wxDouble y, int fillStyle = wxODDEVEN_RULE) const;
private :
    CGMutablePathRef m_path;
};

//-----------------------------------------------------------------------------
// wxMacCoreGraphicsPath implementation
//-----------------------------------------------------------------------------

wxMacCoreGraphicsPathData::wxMacCoreGraphicsPathData( wxGraphicsRenderer* renderer, CGMutablePathRef path) : wxGraphicsPathData(renderer)
{
    if ( path )
        m_path = path;
    else
        m_path = CGPathCreateMutable();
}

wxMacCoreGraphicsPathData::~wxMacCoreGraphicsPathData()
{
    CGPathRelease( m_path );
}

wxGraphicsObjectRefData* wxMacCoreGraphicsPathData::Clone() const
{
    wxMacCoreGraphicsPathData* clone = new wxMacCoreGraphicsPathData(GetRenderer(),CGPathCreateMutableCopy(m_path));
    return clone ;
}


// opens (starts) a new subpath
void wxMacCoreGraphicsPathData::MoveToPoint( wxDouble x1 , wxDouble y1 )
{
    CGPathMoveToPoint( m_path , NULL , x1 , y1 );
}

void wxMacCoreGraphicsPathData::AddLineToPoint( wxDouble x1 , wxDouble y1 )
{
    CGPathAddLineToPoint( m_path , NULL , x1 , y1 );
}

void wxMacCoreGraphicsPathData::AddCurveToPoint( wxDouble cx1, wxDouble cy1, wxDouble cx2, wxDouble cy2, wxDouble x, wxDouble y )
{
    CGPathAddCurveToPoint( m_path , NULL , cx1 , cy1 , cx2, cy2, x , y );
}

void wxMacCoreGraphicsPathData::AddQuadCurveToPoint( wxDouble cx1, wxDouble cy1, wxDouble x, wxDouble y )
{
    CGPathAddQuadCurveToPoint( m_path , NULL , cx1 , cy1 , x , y );
}

void wxMacCoreGraphicsPathData::AddRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h )
{
    CGRect cgRect = { { x , y } , { w , h } };
    CGPathAddRect( m_path , NULL , cgRect );
}

void wxMacCoreGraphicsPathData::AddCircle( wxDouble x, wxDouble y , wxDouble r )
{
    CGPathAddArc( m_path , NULL , x , y , r , 0.0 , 2 * M_PI , true );
}

// adds an arc of a circle centering at (x,y) with radius (r) from startAngle to endAngle
void wxMacCoreGraphicsPathData::AddArc( wxDouble x, wxDouble y, wxDouble r, wxDouble startAngle, wxDouble endAngle, bool clockwise )
{
    // inverse direction as we the 'normal' state is a y axis pointing down, ie mirrored to the standard core graphics setup
    CGPathAddArc( m_path, NULL , x, y, r, startAngle, endAngle, !clockwise);
}

void wxMacCoreGraphicsPathData::AddArcToPoint( wxDouble x1, wxDouble y1 , wxDouble x2, wxDouble y2, wxDouble r )
{
    CGPathAddArcToPoint( m_path, NULL , x1, y1, x2, y2, r);
}

void wxMacCoreGraphicsPathData::AddPath( const wxGraphicsPathData* path )
{
    CGPathAddPath( m_path , NULL, (CGPathRef) path->GetNativePath() );
}

// closes the current subpath
void wxMacCoreGraphicsPathData::CloseSubpath()
{
    CGPathCloseSubpath( m_path );
}

// gets the last point of the current path, (0,0) if not yet set
void wxMacCoreGraphicsPathData::GetCurrentPoint( wxDouble* x, wxDouble* y) const
{
    CGPoint p = CGPathGetCurrentPoint( m_path );
    *x = p.x;
    *y = p.y;
}

// transforms each point of this path by the matrix
void wxMacCoreGraphicsPathData::Transform( const wxGraphicsMatrixData* matrix )
{
    CGMutablePathRef p = CGPathCreateMutable() ;
    CGPathAddPath( p, (CGAffineTransform*) matrix->GetNativeMatrix() , m_path );
    CGPathRelease( m_path );
    m_path = p;
}

// gets the bounding box enclosing all points (possibly including control points)
void wxMacCoreGraphicsPathData::GetBox(wxDouble *x, wxDouble *y, wxDouble *w, wxDouble *h) const
{
    CGRect bounds = CGPathGetBoundingBox( m_path ) ;
    *x = bounds.origin.x;
    *y = bounds.origin.y;
    *w = bounds.size.width;
    *h = bounds.size.height;
}

bool wxMacCoreGraphicsPathData::Contains( wxDouble x, wxDouble y, int fillStyle) const
{
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_4
    if ( CGPathContainsPoint!=NULL )
    {
        return CGPathContainsPoint( m_path, NULL, CGPointMake(x,y), fillStyle == wxODDEVEN_RULE );
    }
    else
#endif
    {
        // TODO : implementation for 10.3
        CGRect bounds = CGPathGetBoundingBox( m_path ) ;
        return CGRectContainsPoint( bounds, CGPointMake(x,y) ) == 1;
    }
}

//
// Graphics Context
//

//-----------------------------------------------------------------------------
// wxMacCoreGraphicsContext declaration
//-----------------------------------------------------------------------------

class WXDLLEXPORT wxMacCoreGraphicsContext : public wxGraphicsContext
{
public:
    wxMacCoreGraphicsContext( wxGraphicsRenderer* renderer, CGContextRef cgcontext );

    wxMacCoreGraphicsContext( wxGraphicsRenderer* renderer, WindowRef window );

    wxMacCoreGraphicsContext( wxGraphicsRenderer* renderer, wxWindow* window );

    wxMacCoreGraphicsContext( wxGraphicsRenderer* renderer);

    wxMacCoreGraphicsContext();

    ~wxMacCoreGraphicsContext();

    void Init();

    // push the current state of the context, ie the transformation matrix on a stack
    virtual void PushState();

    // pops a stored state from the stack
    virtual void PopState();

    // clips drawings to the region
    virtual void Clip( const wxRegion &region );

    // clips drawings to the rect
    virtual void Clip( wxDouble x, wxDouble y, wxDouble w, wxDouble h );

    // resets the clipping to original extent
    virtual void ResetClip();

    virtual void * GetNativeContext();

    bool SetLogicalFunction( int function );
    //
    // transformation
    //

    // translate
    virtual void Translate( wxDouble dx , wxDouble dy );

    // scale
    virtual void Scale( wxDouble xScale , wxDouble yScale );

    // rotate (radians)
    virtual void Rotate( wxDouble angle );

    // concatenates this transform with the current transform of this context
    virtual void ConcatTransform( const wxGraphicsMatrix& matrix );

    // sets the transform of this context
    virtual void SetTransform( const wxGraphicsMatrix& matrix );

    // gets the matrix of this context
    virtual wxGraphicsMatrix GetTransform() const;
    //
    // setting the paint
    //

    // strokes along a path with the current pen
    virtual void StrokePath( const wxGraphicsPath &path );

    // fills a path with the current brush
    virtual void FillPath( const wxGraphicsPath &path, int fillStyle = wxODDEVEN_RULE );

    // draws a path by first filling and then stroking
    virtual void DrawPath( const wxGraphicsPath &path, int fillStyle = wxODDEVEN_RULE );

    virtual bool ShouldOffset() const
    {     
        int penwidth = 0 ;
        if ( !m_pen.IsNull() )
        {
            penwidth = (int)((wxMacCoreGraphicsPenData*)m_pen.GetRefData())->GetWidth();
            if ( penwidth == 0 )
                penwidth = 1;
        }
        return ( penwidth % 2 ) == 1;
    }
    //
    // text
    //

    virtual void DrawText( const wxString &str, wxDouble x, wxDouble y );

    virtual void DrawText( const wxString &str, wxDouble x, wxDouble y, wxDouble angle );

    virtual void GetTextExtent( const wxString &text, wxDouble *width, wxDouble *height,
        wxDouble *descent, wxDouble *externalLeading ) const;

    virtual void GetPartialTextExtents(const wxString& text, wxArrayDouble& widths) const;

    //
    // image support
    //

    virtual void DrawBitmap( const wxBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h );

    virtual void DrawIcon( const wxIcon &icon, wxDouble x, wxDouble y, wxDouble w, wxDouble h );

    void SetNativeContext( CGContextRef cg );

    DECLARE_NO_COPY_CLASS(wxMacCoreGraphicsContext)
    DECLARE_DYNAMIC_CLASS(wxMacCoreGraphicsContext)

private:
    void EnsureIsValid();

    CGContextRef m_cgContext;
    WindowRef m_windowRef;
    bool m_releaseContext;
    CGAffineTransform m_windowTransform;