wxWidgets/include/wx/graphics.h

/////////////////////////////////////////////////////////////////////////////
// Name:        wx/graphics.h
// Purpose:     graphics context header
// Author:      Stefan Csomor
// Modified by:
// Created:
// Copyright:   (c) Stefan Csomor
// RCS-ID:      $Id$
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifndef _WX_GRAPHICS_H_
#define _WX_GRAPHICS_H_


#if wxUSE_GRAPHICS_CONTEXT

// ---------------------------------------------------------------------------
// macros
// ---------------------------------------------------------------------------

#include "wx/geometry.h"
#include "wx/dcclient.h"
#include "wx/dynarray.h"

/*
 * notes about the graphics context apis
 *
 * angles : are measured in radians, 0.0 being in direction of positiv x axis, PI/2 being 
 * in direction of positive y axis.
 */
 
class WXDLLEXPORT wxGraphicsPath
{
public :
    wxGraphicsPath() {}
    virtual ~wxGraphicsPath() {}
    
    //
    // These are the path primitives from which everything else can be constructed
    //

    // begins a new subpath at (x,y)
    virtual void MoveToPoint( wxDouble x, wxDouble y ) = 0;

    // adds a straight line from the current point to (x,y) 
    virtual void AddLineToPoint( wxDouble x, wxDouble y ) = 0;

    // 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 ) = 0;

    // closes the current sub-path
    virtual void CloseSubpath() = 0;

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

    // 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 ) = 0;

    //
    // 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 ) ;

    // wrappers using wxPoint2DDoubles

    wxPoint2DDouble GetCurrentPoint();

    void MoveToPoint( const wxPoint2DDouble& p);

    void AddLineToPoint( const wxPoint2DDouble& p);

    void AddCurveToPoint( const wxPoint2DDouble& c1, const wxPoint2DDouble& c2, const wxPoint2DDouble& e);

    void AddArc( const wxPoint2DDouble& c, wxDouble r, wxDouble startAngle, wxDouble endAngle, bool clockwise);

    DECLARE_NO_COPY_CLASS(wxGraphicsPath)
};

class WXDLLEXPORT wxGraphicsContext
{
public:
    wxGraphicsContext() {}
    virtual ~wxGraphicsContext() {}
    
    static wxGraphicsContext* Create( const wxWindowDC& dc) ;

    // creates a path instance that corresponds to the type of graphics context, ie GDIPlus, cairo, CoreGraphics ...
    virtual wxGraphicsPath * CreatePath() = 0;

    // push the current state of the context, ie the transformation matrix on a stack
    virtual void PushState() = 0;

    // pops a stored state from the stack
    virtual void PopState() = 0;

    // clips drawings to the region
    virtual void Clip( const wxRegion &region ) = 0;

    //
    // transformation
    //
    
    // translate
    virtual void Translate( wxDouble dx , wxDouble dy ) = 0;

    // scale
    virtual void Scale( wxDouble xScale , wxDouble yScale ) = 0;

    // rotate (radians)
    virtual void Rotate( wxDouble angle ) = 0;

    //
    // setting the paint
    //
    
    // sets the pan
    virtual void SetPen( const wxPen &pen ) = 0;

    // sets the brush for filling
    virtual void SetBrush( const wxBrush &brush ) = 0;

    // sets the brush to a linear gradient, starting at (x1,y1) with color c1 to (x2,y2) with color c2
    virtual void SetLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2, 
        const wxColour&c1, const wxColour&c2) = 0;

    // sets the brush to a radial gradient originating at (xo,yc) with color oColor and ends on a circle around (xc,yc) 
    // with radius r and color cColor
    virtual void SetRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
        const wxColour &oColor, const wxColour &cColor) = 0;

    // sets the font
    virtual void SetFont( const wxFont &font ) = 0;
    
    // sets the text color
    virtual void SetTextColor( const wxColour &col ) = 0;

    // strokes along a path with the current pen
    virtual void StrokePath( const wxGraphicsPath *path ) = 0;

    // fills a path with the current brush
    virtual void FillPath( const wxGraphicsPath *path, int fillStyle = wxWINDING_RULE ) = 0;

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

    //
    // text
    //
    
    virtual void DrawText( const wxString &str, wxDouble x, wxDouble y ) = 0;

    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  = 0;

    virtual void GetPartialTextExtents(const wxString& text, wxArrayDouble& widths) const = 0;

    //
    // image support
    //

    virtual void DrawBitmap( const wxBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h ) = 0;

    virtual void DrawIcon( const wxIcon &icon, wxDouble x, wxDouble y, wxDouble w, wxDouble h ) = 0;

    //
    // convenience methods
    //
    
    // strokes a single line
    virtual void StrokeLine( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2);

    // stroke lines connecting each of the points
    virtual void StrokeLines( size_t n, const wxPoint2DDouble *points);

    // stroke disconnected lines from begin to end points
    virtual void StrokeLines( size_t n, const wxPoint2DDouble *beginPoints, const wxPoint2DDouble *endPoints);

    // draws a polygon
    virtual void DrawLines( size_t n, const wxPoint2DDouble *points, int fillStyle = wxWINDING_RULE );

    // draws a polygon
    virtual void DrawRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h);

    // draws an ellipse
    virtual void DrawEllipse( wxDouble x, wxDouble y, wxDouble w, wxDouble h);

    // draws a rounded rectangle
    virtual void DrawRoundedRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h, wxDouble radius);

     // wrappers using wxPoint2DDouble TODO

    DECLARE_NO_COPY_CLASS(wxGraphicsContext)
};

class WXDLLEXPORT wxGCDC: public wxDC
{
    DECLARE_DYNAMIC_CLASS(wxGCDC)
    DECLARE_NO_COPY_CLASS(wxGCDC)

public:
    wxGCDC(const wxWindowDC& dc);
    wxGCDC();
    virtual ~wxGCDC();

    void Init();


    // implement base class pure virtuals
    // ----------------------------------

    virtual void Clear();

    virtual bool StartDoc( const wxString& WXUNUSED(message) ) { return true; }
    virtual void EndDoc(void) {}

    virtual void StartPage(void) {}
    virtual void EndPage(void) {}

    virtual void SetFont(const wxFont& font);
    virtual void SetPen(const wxPen& pen);
    virtual void SetBrush(const wxBrush& brush);
    virtual void SetBackground(const wxBrush& brush);
    virtual void SetBackgroundMode(int mode);
    virtual void SetPalette(const wxPalette& palette);

    virtual void DestroyClippingRegion();

    virtual wxCoord GetCharHeight() const;
    virtual wxCoord GetCharWidth() const;

    virtual bool CanDrawBitmap() const;
    virtual bool CanGetTextExtent() const;
    virtual int GetDepth() const;
    virtual wxSize GetPPI() const;

    virtual void SetMapMode(int mode);
    virtual void SetUserScale(double x, double y);

    virtual void SetLogicalScale(double x, double y);
    virtual void SetLogicalOrigin(wxCoord x, wxCoord y);
    virtual void SetDeviceOrigin(wxCoord x, wxCoord y);
    virtual void SetAxisOrientation(bool xLeftRight, bool yBottomUp);
    virtual void SetLogicalFunction(int function);

    virtual void SetTextForeground(const wxColour& colour);
    virtual void SetTextBackground(const wxColour& colour);

    virtual void ComputeScaleAndOrigin();

    wxGraphicsContext* GetGraphicContext() { return m_graphicContext; }

protected:
    // the true implementations
    virtual bool DoFloodFill(wxCoord x, wxCoord y, const wxColour& col,
        int style = wxFLOOD_SURFACE);

    virtual void DoGradientFillLinear(const wxRect& rect,
        const wxColour& initialColour,
        const wxColour& destColour,
        wxDirection nDirection = wxEAST);

    virtual void DoGradientFillConcentric(const wxRect& rect,
        const wxColour& initialColour,
        const wxColour& destColour,
        const wxPoint& circleCenter);

    virtual bool DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const;

    virtual void DoDrawPoint(wxCoord x, wxCoord y);

#if wxUSE_SPLINES
    virtual void DoDrawSpline(wxList *points);
#endif

    virtual void DoDrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2);

    virtual void DoDrawArc(wxCoord x1, wxCoord y1,
        wxCoord x2, wxCoord y2,
        wxCoord xc, wxCoord yc);

    virtual void DoDrawCheckMark(wxCoord x, wxCoord y,
        wxCoord width, wxCoord height);

    virtual void DoDrawEllipticArc(wxCoord x, wxCoord y, wxCoord w, wxCoord h,
        double sa, double ea);

    virtual void DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
    virtual void DoDrawRoundedRectangle(wxCoord x, wxCoord y,
        wxCoord width, wxCoord height,
        double radius);
    virtual void DoDrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height);

    virtual void DoCrossHair(wxCoord x, wxCoord y);

    virtual void DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y);
    virtual void DoDrawBitmap(const wxBitmap &bmp, wxCoord x, wxCoord y,
        bool useMask = false);

    virtual void DoDrawText(const wxString& text, wxCoord x, wxCoord y);
    virtual void DoDrawRotatedText(const wxString& text, wxCoord x, wxCoord y,
        double angle);

    virtual bool DoBlit(wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
        wxDC *source, wxCoord xsrc, wxCoord ysrc,
        int rop = wxCOPY, bool useMask = false, wxCoord xsrcMask = -1, wxCoord ysrcMask = -1);

    virtual void DoGetSize(int *,int *) const;
    virtual void DoGetSizeMM(int* width, int* height) const;

    virtual void DoDrawLines(int n, wxPoint points[],
        wxCoord xoffset, wxCoord yoffset);
    virtual void DoDrawPolygon(int n, wxPoint points[],
        wxCoord xoffset, wxCoord yoffset,
        int fillStyle = wxODDEVEN_RULE);
    virtual void DoDrawPolyPolygon(int n, int count[], wxPoint points[],
        wxCoord xoffset, wxCoord yoffset,
        int fillStyle);

    virtual void DoSetClippingRegionAsRegion(const wxRegion& region);
    virtual void DoSetClippingRegion(wxCoord x, wxCoord y,
        wxCoord width, wxCoord height);

    virtual void DoGetTextExtent(const wxString& string,
        wxCoord *x, wxCoord *y,
        wxCoord *descent = NULL,
        wxCoord *externalLeading = NULL,
        wxFont *theFont = NULL) const;

    virtual bool DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const;

protected:
    // scaling variables
    double       m_mm_to_pix_x, m_mm_to_pix_y;

    wxGraphicsContext* m_graphicContext;
};
#endif

#endif
    // _WX_GRID_H_BASE_