dc.h

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/////////////////////////////////////////////////////////////////////////////
// Name:        dc.h
// Purpose:     wxDC class
// Author:      Vadim Zeitlin
// Modified by:
// Created:     05/25/99
// RCS-ID:      $Id: dc.h,v 1.69 2005/06/26 15:46:07 RR Exp $
// Copyright:   (c) wxWidgets team
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifndef _WX_DC_H_BASE_
#define _WX_DC_H_BASE_

#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
    #pragma interface "dcbase.h"
#endif

// ----------------------------------------------------------------------------
// headers which we must include here
// ----------------------------------------------------------------------------

#include "wx/object.h"          // the base class

#include "wx/cursor.h"          // we have member variables of these classes
#include "wx/font.h"            // so we can't do without them
#include "wx/colour.h"
#include "wx/bitmap.h"          // for wxNullBitmap
#include "wx/brush.h"
#include "wx/pen.h"
#include "wx/palette.h"
#include "wx/list.h"            // we use wxList in inline functions
#include "wx/dynarray.h"
#include "wx/math.h"

class WXDLLEXPORT wxDC;
class WXDLLEXPORT wxDCBase;

class WXDLLEXPORT wxDrawObject
{
public:

    wxDrawObject()
        : m_isBBoxValid(false)
        , m_minX(0), m_minY(0), m_maxX(0), m_maxY(0)
    { }

    virtual ~wxDrawObject() { }

    virtual void Draw(wxDCBase&) const { }

    virtual void CalcBoundingBox(wxCoord x, wxCoord y)
    {
      if ( m_isBBoxValid )
      {
         if ( x < m_minX ) m_minX = x;
         if ( y < m_minY ) m_minY = y;
         if ( x > m_maxX ) m_maxX = x;
         if ( y > m_maxY ) m_maxY = y;
      }
      else
      {
         m_isBBoxValid = true;

         m_minX = x;
         m_minY = y;
         m_maxX = x;
         m_maxY = y;
      }
    }

    void ResetBoundingBox()
    {
        m_isBBoxValid = false;

        m_minX = m_maxX = m_minY = m_maxY = 0;
    }

    // Get the final bounding box of the PostScript or Metafile picture.

    wxCoord MinX() const { return m_minX; }
    wxCoord MaxX() const { return m_maxX; }
    wxCoord MinY() const { return m_minY; }
    wxCoord MaxY() const { return m_maxY; }

    //to define the type of object for derived objects
    virtual int GetType()=0;

protected:
    //for boundingbox calculation
    bool m_isBBoxValid:1;
    //for boundingbox calculation
    wxCoord m_minX, m_minY, m_maxX, m_maxY;
};

// ---------------------------------------------------------------------------
// global variables
// ---------------------------------------------------------------------------

extern WXDLLEXPORT_DATA(int) wxPageNumber;

// ---------------------------------------------------------------------------
// wxDC is the device context - object on which any drawing is done
// ---------------------------------------------------------------------------

class WXDLLEXPORT wxDCBase : public wxObject
{
public:
    wxDCBase()
        : m_colour(wxColourDisplay())
        , m_ok(true)
        , m_clipping(false)
        , m_isInteractive(0)
        , m_isBBoxValid(false)
        , m_logicalOriginX(0), m_logicalOriginY(0)
        , m_deviceOriginX(0), m_deviceOriginY(0)
        , m_logicalScaleX(1.0), m_logicalScaleY(1.0)
        , m_userScaleX(1.0), m_userScaleY(1.0)
        , m_scaleX(1.0), m_scaleY(1.0)
        , m_signX(1), m_signY(1)
        , m_minX(0), m_minY(0), m_maxX(0), m_maxY(0)
        , m_clipX1(0), m_clipY1(0), m_clipX2(0), m_clipY2(0)
        , m_logicalFunction(wxCOPY)
        , m_backgroundMode(wxTRANSPARENT)
        , m_mappingMode(wxMM_TEXT)
        , m_pen()
        , m_brush()
        , m_backgroundBrush(*wxTRANSPARENT_BRUSH)
        , m_textForegroundColour(*wxBLACK)
        , m_textBackgroundColour(*wxWHITE)
        , m_font()
#if wxUSE_PALETTE
        , m_palette()
        , m_hasCustomPalette(false)
#endif // wxUSE_PALETTE
    {
        ResetBoundingBox();
        ResetClipping();
    }

    ~wxDCBase() { }

    virtual void BeginDrawing() { }
    virtual void EndDrawing() { }

    // graphic primitives
    // ------------------

    virtual void DrawObject(wxDrawObject* drawobject)
    {
        drawobject->Draw(*this);
        CalcBoundingBox(drawobject->MinX(),drawobject->MinY());
        CalcBoundingBox(drawobject->MaxX(),drawobject->MaxY());
    }

    bool FloodFill(wxCoord x, wxCoord y, const wxColour& col,
                   int style = wxFLOOD_SURFACE)
        { return DoFloodFill(x, y, col, style); }
    bool FloodFill(const wxPoint& pt, const wxColour& col,
                   int style = wxFLOOD_SURFACE)
        { return DoFloodFill(pt.x, pt.y, col, style); }

    bool GetPixel(wxCoord x, wxCoord y, wxColour *col) const
        { return DoGetPixel(x, y, col); }
    bool GetPixel(const wxPoint& pt, wxColour *col) const
        { return DoGetPixel(pt.x, pt.y, col); }

    void DrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2)
        { DoDrawLine(x1, y1, x2, y2); }
    void DrawLine(const wxPoint& pt1, const wxPoint& pt2)
        { DoDrawLine(pt1.x, pt1.y, pt2.x, pt2.y); }

    void CrossHair(wxCoord x, wxCoord y)
        { DoCrossHair(x, y); }
    void CrossHair(const wxPoint& pt)
        { DoCrossHair(pt.x, pt.y); }

    void DrawArc(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2,
                 wxCoord xc, wxCoord yc)
        { DoDrawArc(x1, y1, x2, y2, xc, yc); }
    void DrawArc(const wxPoint& pt1, const wxPoint& pt2, const wxPoint& centre)
        { DoDrawArc(pt1.x, pt1.y, pt2.x, pt2.y, centre.x, centre.y); }

    void DrawCheckMark(wxCoord x, wxCoord y,
                       wxCoord width, wxCoord height)
        { DoDrawCheckMark(x, y, width, height); }
    void DrawCheckMark(const wxRect& rect)
        { DoDrawCheckMark(rect.x, rect.y, rect.width, rect.height); }

    void DrawEllipticArc(wxCoord x, wxCoord y, wxCoord w, wxCoord h,
                         double sa, double ea)
        { DoDrawEllipticArc(x, y, w, h, sa, ea); }
    void DrawEllipticArc(const wxPoint& pt, const wxSize& sz,
                         double sa, double ea)
        { DoDrawEllipticArc(pt.x, pt.y, sz.x, sz.y, sa, ea); }

    void DrawPoint(wxCoord x, wxCoord y)
        { DoDrawPoint(x, y); }
    void DrawPoint(const wxPoint& pt)
        { DoDrawPoint(pt.x, pt.y); }

    void DrawLines(int n, wxPoint points[],
                   wxCoord xoffset = 0, wxCoord yoffset = 0)
        { DoDrawLines(n, points, xoffset, yoffset); }
    void DrawLines(const wxList *list,
                   wxCoord xoffset = 0, wxCoord yoffset = 0);

    void DrawPolygon(int n, wxPoint points[],
                     wxCoord xoffset = 0, wxCoord yoffset = 0,
                     int fillStyle = wxODDEVEN_RULE)
        { DoDrawPolygon(n, points, xoffset, yoffset, fillStyle); }

    void DrawPolygon(const wxList *list,
                     wxCoord xoffset = 0, wxCoord yoffset = 0,
                     int fillStyle = wxODDEVEN_RULE);

    void DrawPolyPolygon(int n, int count[], wxPoint points[],
                         wxCoord xoffset = 0, wxCoord yoffset = 0,
                         int fillStyle = wxODDEVEN_RULE)
        { DoDrawPolyPolygon(n, count, points, xoffset, yoffset, fillStyle); }

    void DrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
        { DoDrawRectangle(x, y, width, height); }
    void DrawRectangle(const wxPoint& pt, const wxSize& sz)
        { DoDrawRectangle(pt.x, pt.y, sz.x, sz.y); }
    void DrawRectangle(const wxRect& rect)
        { DoDrawRectangle(rect.x, rect.y, rect.width, rect.height); }

    void DrawRoundedRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height,
                              double radius)
        { DoDrawRoundedRectangle(x, y, width, height, radius); }
    void DrawRoundedRectangle(const wxPoint& pt, const wxSize& sz,
                             double radius)
        { DoDrawRoundedRectangle(pt.x, pt.y, sz.x, sz.y, radius); }
    void DrawRoundedRectangle(const wxRect& r, double radius)
        { DoDrawRoundedRectangle(r.x, r.y, r.width, r.height, radius); }

    void DrawCircle(wxCoord x, wxCoord y, wxCoord radius)
        { DoDrawEllipse(x - radius, y - radius, 2*radius, 2*radius); }
    void DrawCircle(const wxPoint& pt, wxCoord radius)
        { DrawCircle(pt.x, pt.y, radius); }

    void DrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
        { DoDrawEllipse(x, y, width, height); }
    void DrawEllipse(const wxPoint& pt, const wxSize& sz)
        { DoDrawEllipse(pt.x, pt.y, sz.x, sz.y); }
    void DrawEllipse(const wxRect& rect)
        { DoDrawEllipse(rect.x, rect.y, rect.width, rect.height); }

    void DrawIcon(const wxIcon& icon, wxCoord x, wxCoord y)
        { DoDrawIcon(icon, x, y); }
    void DrawIcon(const wxIcon& icon, const wxPoint& pt)
        { DoDrawIcon(icon, pt.x, pt.y); }

    void DrawBitmap(const wxBitmap &bmp, wxCoord x, wxCoord y,
                    bool useMask = false)
        { DoDrawBitmap(bmp, x, y, useMask); }
    void DrawBitmap(const wxBitmap &bmp, const wxPoint& pt,
                    bool useMask = false)
        { DoDrawBitmap(bmp, pt.x, pt.y, useMask); }

    void DrawText(const wxString& text, wxCoord x, wxCoord y)
        { DoDrawText(text, x, y); }
    void DrawText(const wxString& text, const wxPoint& pt)
        { DoDrawText(text, pt.x, pt.y); }

    void DrawRotatedText(const wxString& text, wxCoord x, wxCoord y, double angle)
        { DoDrawRotatedText(text, x, y, angle); }
    void DrawRotatedText(const wxString& text, const wxPoint& pt, double angle)
        { DoDrawRotatedText(text, pt.x, pt.y, angle); }

    // this version puts both optional bitmap and the text into the given
    // rectangle and aligns is as specified by alignment parameter; it also
    // will emphasize the character with the given index if it is != -1 and
    // return the bounding rectangle if required
    virtual void DrawLabel(const wxString& text,
                           const wxBitmap& image,
                           const wxRect& rect,
                           int alignment = wxALIGN_LEFT | wxALIGN_TOP,
                           int indexAccel = -1,
                           wxRect *rectBounding = NULL);

    void DrawLabel(const wxString& text, const wxRect& rect,
                   int alignment = wxALIGN_LEFT | wxALIGN_TOP,
                   int indexAccel = -1)
        { DrawLabel(text, wxNullBitmap, rect, alignment, indexAccel); }

    bool Blit(wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
              wxDC *source, wxCoord xsrc, wxCoord ysrc,
              int rop = wxCOPY, bool useMask = false, wxCoord xsrcMask = wxDefaultCoord, wxCoord ysrcMask = wxDefaultCoord)
    {
        return DoBlit(xdest, ydest, width, height,
                      source, xsrc, ysrc, rop, useMask, xsrcMask, ysrcMask);