include/wx/mgl/dc.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        dc.h
   3 // Purpose:     wxDC class
   4 // Author:      Vaclav Slavik
   5 // Created:     2001/03/09
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2001-2002 SciTech Software, Inc. (www.scitechsoft.com)
   8 // Licence:     wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11 #ifndef _WX_DC_H_
  12 #define _WX_DC_H_
  13
  14 #include "wx/defs.h"
  15 #include "wx/region.h"
  16
  17 //-----------------------------------------------------------------------------
  18 // classes
  19 //-----------------------------------------------------------------------------
  20
  21 class WXDLLEXPORT wxDC;
  22
  23 //-----------------------------------------------------------------------------
  24 // constants
  25 //-----------------------------------------------------------------------------
  26
  27 #ifndef MM_TEXT
  28 #define MM_TEXT         0
  29 #define MM_ISOTROPIC    1
  30 #define MM_ANISOTROPIC  2
  31 #define MM_LOMETRIC     3
  32 #define MM_HIMETRIC     4
  33 #define MM_TWIPS        5
  34 #define MM_POINTS       6
  35 #define MM_METRIC       7
  36 #endif
  37
  38 //-----------------------------------------------------------------------------
  39 // wxDC
  40 //-----------------------------------------------------------------------------
  41
  42
  43 // MGL fwd declarations:
  44 class MGLDevCtx;
  45 class MGLRegion;
  46 struct font_t;
  47
  48 class WXDLLEXPORT wxDC : public wxDCBase
  49 {
  50     DECLARE_DYNAMIC_CLASS(wxDC)
  51
  52 public:
  53     wxDC();
  54     virtual ~wxDC();
  55
  56     // implement base class pure virtuals
  57     // ----------------------------------
  58
  59     virtual void Clear();
  60
  61     virtual bool StartDoc(const wxString& message);
  62     virtual void EndDoc();
  63
  64     virtual void StartPage();
  65     virtual void EndPage();
  66
  67     virtual void SetFont(const wxFont& font);
  68     virtual void SetPen(const wxPen& pen);
  69     virtual void SetBrush(const wxBrush& brush);
  70     virtual void SetBackground(const wxBrush& brush);
  71     virtual void SetBackgroundMode(int mode);
  72     virtual void SetPalette(const wxPalette& palette);
  73
  74     virtual void DestroyClippingRegion();
  75
  76     virtual wxCoord GetCharHeight() const;
  77     virtual wxCoord GetCharWidth() const;
  78     virtual void DoGetTextExtent(const wxString& string,
  79                                  wxCoord *x, wxCoord *y,
  80                                  wxCoord *descent = NULL,
  81                                  wxCoord *externalLeading = NULL,
  82                                  wxFont *theFont = NULL) const;
  83
  84     virtual bool CanDrawBitmap() const;
  85     virtual bool CanGetTextExtent() const;
  86     virtual int GetDepth() const;
  87     virtual wxSize GetPPI() const;
  88
  89     virtual void SetMapMode(int mode);
  90     virtual void SetUserScale(double x, double y);
  91     virtual void SetLogicalScale(double x, double y);
  92     virtual void SetLogicalOrigin(wxCoord x, wxCoord y);
  93     virtual void SetDeviceOrigin(wxCoord x, wxCoord y);
  94     virtual void SetAxisOrientation(bool xLeftRight, bool yBottomUp);
  95     virtual void SetLogicalFunction(int function);
  96
  97     // implementation from now on
  98     // --------------------------
  99
 100     virtual void ComputeScaleAndOrigin();
 101
 102     wxCoord XDEV2LOG(wxCoord x) const
 103     {
 104         wxCoord new_x = x - m_deviceOriginX;
 105         if (new_x > 0)
 106             return (wxCoord)((double)(new_x) / m_scaleX + 0.5) * m_signX + m_logicalOriginX;
 107         else
 108             return (wxCoord)((double)(new_x) / m_scaleX - 0.5) * m_signX + m_logicalOriginX;
 109     }
 110     wxCoord XDEV2LOGREL(wxCoord x) const
 111     {
 112         if (x > 0)
 113             return (wxCoord)((double)(x) / m_scaleX + 0.5);
 114         else
 115             return (wxCoord)((double)(x) / m_scaleX - 0.5);
 116     }
 117     wxCoord YDEV2LOG(wxCoord y) const
 118     {
 119         wxCoord new_y = y - m_deviceOriginY;
 120         if (new_y > 0)
 121             return (wxCoord)((double)(new_y) / m_scaleY + 0.5) * m_signY + m_logicalOriginY;
 122         else
 123             return (wxCoord)((double)(new_y) / m_scaleY - 0.5) * m_signY + m_logicalOriginY;
 124     }
 125     wxCoord YDEV2LOGREL(wxCoord y) const
 126     {
 127         if (y > 0)
 128             return (wxCoord)((double)(y) / m_scaleY + 0.5);
 129         else
 130             return (wxCoord)((double)(y) / m_scaleY - 0.5);
 131     }
 132     wxCoord XLOG2DEV(wxCoord x) const
 133     {
 134         wxCoord new_x = x - m_logicalOriginX;
 135         if (new_x > 0)
 136             return (wxCoord)((double)(new_x) * m_scaleX + 0.5) * m_signX + m_deviceOriginX;
 137         else
 138             return (wxCoord)((double)(new_x) * m_scaleX - 0.5) * m_signX + m_deviceOriginX;
 139     }
 140     wxCoord XLOG2DEVREL(wxCoord x) const
 141     {
 142         if (x > 0)
 143             return (wxCoord)((double)(x) * m_scaleX + 0.5);
 144         else
 145             return (wxCoord)((double)(x) * m_scaleX - 0.5);
 146     }
 147     wxCoord YLOG2DEV(wxCoord y) const
 148     {
 149         wxCoord new_y = y - m_logicalOriginY;
 150         if (new_y > 0)
 151             return (wxCoord)((double)(new_y) * m_scaleY + 0.5) * m_signY + m_deviceOriginY;
 152         else
 153             return (wxCoord)((double)(new_y) * m_scaleY - 0.5) * m_signY + m_deviceOriginY;
 154     }
 155     wxCoord YLOG2DEVREL(wxCoord y) const
 156     {
 157         if (y > 0)
 158             return (wxCoord)((double)(y) * m_scaleY + 0.5);
 159         else
 160             return (wxCoord)((double)(y) * m_scaleY - 0.5);
 161     }
 162
 163     MGLDevCtx *GetMGLDC() const { return m_MGLDC; }
 164     void SetMGLDC(MGLDevCtx *mgldc, bool OwnsMGLDC = false);
 165
 166 protected:
 167     virtual bool DoFloodFill(wxCoord x, wxCoord y, const wxColour& col,
 168                              int style = wxFLOOD_SURFACE);
 169
 170     virtual bool DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const;
 171
 172     virtual void DoDrawPoint(wxCoord x, wxCoord y);
 173     virtual void DoDrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2);
 174
 175     virtual void DoDrawArc(wxCoord x1, wxCoord y1,
 176                            wxCoord x2, wxCoord y2,
 177                            wxCoord xc, wxCoord yc);
 178     virtual void DoDrawEllipticArc(wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 179                                    double sa, double ea);
 180
 181     virtual void DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
 182     virtual void DoDrawRoundedRectangle(wxCoord x, wxCoord y,
 183                                         wxCoord width, wxCoord height,
 184                                         double radius);
 185     virtual void DoDrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
 186
 187     virtual void DoCrossHair(wxCoord x, wxCoord y);
 188
 189     virtual void DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y);
 190     virtual void DoDrawBitmap(const wxBitmap &bmp, wxCoord x, wxCoord y,
 191                               bool useMask = false);
 192
 193     virtual void DoDrawText(const wxString& text, wxCoord x, wxCoord y);
 194     virtual void DoDrawRotatedText(const wxString& text, wxCoord x, wxCoord y,
 195                                    double angle);
 196
 197     virtual bool DoBlit(wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
 198                         wxDC *source, wxCoord xsrc, wxCoord ysrc,
 199                         int rop = wxCOPY, bool useMask = false, wxCoord xsrcMask = -1, wxCoord ysrcMask = -1);
 200
 201     // this is gnarly - we can't even call this function DoSetClippingRegion()
 202     // because of virtual function hiding
 203     virtual void DoSetClippingRegionAsRegion(const wxRegion& region);
 204     virtual void DoSetClippingRegion(wxCoord x, wxCoord y,
 205                                      wxCoord width, wxCoord height);
 206
 207     virtual void DoGetSize(int *width, int *height) const;
 208     virtual void DoGetSizeMM(int* width, int* height) const;
 209
 210     virtual void DoDrawLines(int n, wxPoint points[],
 211                              wxCoord xoffset, wxCoord yoffset);
 212     virtual void DoDrawPolygon(int n, wxPoint points[],
 213                                wxCoord xoffset, wxCoord yoffset,
 214                                int fillStyle = wxODDEVEN_RULE);
 215
 216     // implementation from now on:
 217
 218 protected:
 219     // setup newly attached MGLDevCtx for wxDC's use
 220     // (does things like setting RGB blending mode for antialiased texts):
 221     void InitializeMGLDC();
 222
 223     // common part of DoDrawText() and DoDrawRotatedText()
 224     void DrawAnyText(const wxString& text, wxCoord x, wxCoord y);
 225
 226     // MGL uses pens as both wxPens and wxBrushes, so we have to
 227     // switch them as needed:
 228     void SelectPen();
 229     void SelectBrush();
 230     void SelectMGLStipplePen(int style);
 231     void SelectMGLFatPen(int style, int flag);
 232
 233     // Select m_font into m_MGLDC:
 234     bool SelectMGLFont();
 235
 236     // Convert wxWin logical function to MGL rop:
 237     int LogicalFunctionToMGLRop(int logFunc) const;
 238
 239     // Unified implementation of DrawIcon, DrawBitmap and Blit:
 240     void DoDrawSubBitmap(const wxBitmap &bmp,
 241                          wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 242                          wxCoord destx, wxCoord desty, int rop, bool useMask);
 243
 244     // MGL DC class we use:
 245     MGLDevCtx        *m_MGLDC;
 246     bool              m_OwnsMGLDC:1;
 247
 248     // helper variables for SelectXXXX():
 249     bool              m_penSelected;
 250     bool              m_brushSelected;
 251     bool              m_downloadedPatterns[2];
 252
 253     // MGL does not render lines with width>1 with endings centered
 254     // at given coords but with top left corner of the pen at them,
 255     // these offsets are used to correct it. They are computed by
 256     // SelectPen.
 257     int               m_penOfsX, m_penOfsY;
 258
 259     double            m_mm_to_pix_x, m_mm_to_pix_y;
 260
 261     wxPalette         m_oldPalette;
 262
 263     wxRegion          m_currentClippingRegion;
 264     wxRegion          m_globalClippingRegion;
 265
 266     // wxDC::Blit handles memoryDCs as special cases :(
 267     bool              m_isMemDC;
 268
 269     font_t            *m_mglFont;
 270 };
 271
 272 #endif
 273     // _WX_DC_H_