/////////////////////////////////////////////////////////////////////////////
// Name: dc.cpp
// Purpose: wxDC class
-// Author: AUTHOR
+// Author: David Webster
// Modified by:
-// Created: 01/02/97
+// Created: 10/14/99
// RCS-ID: $Id$
-// Copyright: (c) AUTHOR
-// Licence: wxWindows licence
+// Copyright: (c) David Webster
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
-#ifdef __GNUG__
-#pragma implementation "dc.h"
+// For compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"
+
+#ifndef WX_PRECOMP
+ #include "wx/window.h"
+ #include "wx/dc.h"
+ #include "wx/utils.h"
+ #include "wx/dialog.h"
+ #include "wx/app.h"
+ #include "wx/bitmap.h"
+ #include "wx/dcmemory.h"
+ #include "wx/log.h"
+ #include "wx/icon.h"
#endif
-#include "wx/dc.h"
+#include "wx/dcprint.h"
+
+#include <string.h>
+#include <math.h>
+
+#include "wx/os2/private.h"
#if !USE_SHARED_LIBRARY
-IMPLEMENT_ABSTRACT_CLASS(wxDC, wxObject)
+ IMPLEMENT_ABSTRACT_CLASS(wxDC, wxObject)
#endif
-//-----------------------------------------------------------------------------
+// ---------------------------------------------------------------------------
// constants
-//-----------------------------------------------------------------------------
-
-#define mm2inches 0.0393700787402
-#define inches2mm 25.4
-#define mm2twips 56.6929133859
-#define twips2mm 0.0176388888889
-#define mm2pt 2.83464566929
-#define pt2mm 0.352777777778
-
-//-----------------------------------------------------------------------------
-// wxDCBase
-//-----------------------------------------------------------------------------
-
-long wxDCBase::DeviceToLogicalX(long x) const
-{
- long new_x = x - m_deviceOriginX;
- if (new_x > 0)
- return (long)((double)(new_x) / m_scaleX + 0.5) * m_signX + m_logicalOriginX;
- else
- return (long)((double)(new_x) / m_scaleX - 0.5) * m_signX + m_logicalOriginX;
-};
-
-long wxDCBase::DeviceToLogicalY(long y) const
-{
- long new_y = y - m_deviceOriginY;
- if (new_y > 0)
- return (long)((double)(new_y) / m_scaleY + 0.5) * m_signY + m_logicalOriginY;
- else
- return (long)((double)(new_y) / m_scaleY - 0.5) * m_signY + m_logicalOriginY;
-};
-
-long wxDCBase::DeviceToLogicalXRel(long x) const
-{
- if (x > 0)
- return (long)((double)(x) / m_scaleX + 0.5);
- else
- return (long)((double)(x) / m_scaleX - 0.5);
-};
-
-long wxDCBase::DeviceToLogicalYRel(long y) const
-{
- if (y > 0)
- return (long)((double)(y) / m_scaleY + 0.5);
- else
- return (long)((double)(y) / m_scaleY - 0.5);
-};
+// ---------------------------------------------------------------------------
-long wxDCBase::LogicalToDeviceX(long x) const
-{
- long new_x = x - m_logicalOriginX;
- if (new_x > 0)
- return (long)((double)(new_x) * m_scaleX + 0.5) * m_signX + m_deviceOriginX;
- else
- return (long)((double)(new_x) * m_scaleX - 0.5) * m_signX + m_deviceOriginX;
-};
-
-long wxDCBase::LogicalToDeviceY(long y) const
-{
- long new_y = y - m_logicalOriginY;
- if (new_y > 0)
- return (long)((double)(new_y) * m_scaleY + 0.5) * m_signY + m_deviceOriginY;
- else
- return (long)((double)(new_y) * m_scaleY - 0.5) * m_signY + m_deviceOriginY;
-};
+static const int VIEWPORT_EXTENT = 1000;
-long wxDCBase::LogicalToDeviceXRel(long x) const
-{
- if (x > 0)
- return (long)((double)(x) * m_scaleX + 0.5);
- else
- return (long)((double)(x) * m_scaleX - 0.5);
-};
+static const int MM_POINTS = 9;
+static const int MM_METRIC = 10;
-long wxDCBase::LogicalToDeviceYRel(long y) const
-{
- if (y > 0)
- return (long)((double)(y) * m_scaleY + 0.5);
- else
- return (long)((double)(y) * m_scaleY - 0.5);
-};
+// ===========================================================================
+// implementation
+// ===========================================================================
-//-----------------------------------------------------------------------------
+// ---------------------------------------------------------------------------
// wxDC
-//-----------------------------------------------------------------------------
+// ---------------------------------------------------------------------------
wxDC::wxDC(void)
{
- m_owner = NULL;
- m_bitmap = NULL;
+ m_canvas = NULL;
m_oldBitmap = 0;
m_oldPen = 0;
m_oldBrush = 0;
m_oldFont = 0;
m_oldPalette = 0;
+
+ m_bOwnsDC = FALSE;
m_hDC = 0;
m_hDCCount = 0;
};
// TODO:
};
-void wxDC::DestroyClippingRegion(void)
-{
- // TODO:
-};
-
-void wxDC::DoGetSize( int* width, int* height ) const
-{
- // TODO:
-};
-
-void wxDC::DoGetSizeMM( int* width, int* height ) const
-{
- // TODO:
-};
-
-void wxDC::SetMapMode( int mode )
-{
- // TODO:
-};
+// This will select current objects out of the DC,
+// which is what you have to do before deleting the
+// DC.
+void wxDC::SelectOldObjects(WXHDC dc)
+{
+ if (dc)
+ {
+ if (m_oldBitmap)
+ {
+// ::SelectObject((HDC) dc, (HBITMAP) m_oldBitmap);
+ if (m_selectedBitmap.Ok())
+ {
+ m_selectedBitmap.SetSelectedInto(NULL);
+ }
+ }
+ m_oldBitmap = 0;
+ if (m_oldPen)
+ {
+// ::SelectObject((HDC) dc, (HPEN) m_oldPen);
+ }
+ m_oldPen = 0;
+ if (m_oldBrush)
+ {
+// ::SelectObject((HDC) dc, (HBRUSH) m_oldBrush);
+ }
+ m_oldBrush = 0;
+ if (m_oldFont)
+ {
+// ::SelectObject((HDC) dc, (HFONT) m_oldFont);
+ }
+ m_oldFont = 0;
+ if (m_oldPalette)
+ {
+// ::SelectPalette((HDC) dc, (HPALETTE) m_oldPalette, TRUE);
+ }
+ m_oldPalette = 0;
+ }
+
+ m_brush = wxNullBrush;
+ m_pen = wxNullPen;
+ m_palette = wxNullPalette;
+ m_font = wxNullFont;
+ m_backgroundBrush = wxNullBrush;
+ m_selectedBitmap = wxNullBitmap;
+}
+
+// ---------------------------------------------------------------------------
+// clipping
+// ---------------------------------------------------------------------------
-void wxDC::SetUserScale( double x, double y )
+void wxDC::DoSetClippingRegionAsRegion(const wxRegion& region)
{
- m_userScaleX = x;
- m_userScaleY = y;
-
- SetMapMode(m_mappingMode);
-};
+ // TODO
+}
-void wxDC::SetLogicalScale( double x, double y )
+void wxDC::DoSetClippingRegion( wxCoord x, wxCoord y
+ ,wxCoord width, wxCoord height
+ )
{
- // TODO:
-};
+ // TODO
+}
-void wxDC::SetLogicalOrigin( long x, long y )
+void wxDC::DoClipping(WXHDC dc)
{
- // TODO:
-};
+ if (m_clipping && dc)
+ {
+// TODO:
+// IntersectClipRect((HDC) dc, XLOG2DEV(m_clipX1), YLOG2DEV(m_clipY1),
+// XLOG2DEV(m_clipX2), YLOG2DEV(m_clipY2));
+ }
+}
-void wxDC::SetDeviceOrigin( long x, long y )
+void wxDC::DestroyClippingRegion(void)
{
// TODO:
};
-void wxDC::SetInternalDeviceOrigin( long x, long y )
-{
- // TODO:
-};
+// ---------------------------------------------------------------------------
+// query capabilities
+// ---------------------------------------------------------------------------
-void wxDC::GetInternalDeviceOrigin( long *x, long *y )
+bool wxDC::CanDrawBitmap() const
{
- // TODO:
-};
+ return TRUE;
+}
-void wxDC::SetAxisOrientation( bool xLeftRight, bool yBottomUp )
+bool wxDC::CanGetTextExtent() const
{
- // TODO:
-};
+ // What sort of display is it?
+ int technology = 0; // TODO: ::GetDeviceCaps(GetHdc(), TECHNOLOGY);
+ // TODO: return (technology == DT_RASDISPLAY) || (technology == DT_RASPRINTER);
+ return FALSE;
+}
int wxDC::GetDepth() const
{
return (1);
}
-wxSize wxDC::GetPPI() const
+// ---------------------------------------------------------------------------
+// drawing
+// ---------------------------------------------------------------------------
+
+void wxDC::Clear()
{
- int x = 1;
- int y = 1;
- // TODO:
- return (wxSize(x,y));
+ // TODO
}
-void wxDC::GetTextExtent( const wxString& string
- ,long* x
- ,long* y
- ,long* decent
- ,long* externalLeading
- ,wxFont* theFont
- ) const
+
+void wxDC::DoFloodFill( wxCoord x
+ ,wxCoord y
+ ,const wxColour& col
+ ,int style
+ )
{
- // TODO:
+ // TODO
}
-long wxDC::GetCharWidth() const
+bool wxDC::DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const
{
- // TODO
- return(1);
+ // TODO
+ return(TRUE);
}
-long wxDC::GetCharHeight() const
+void wxDC::DoCrossHair(wxCoord x, wxCoord y)
{
- // TODO
- return(1);
+ // TODO
}
-void wxDC::Clear()
+void wxDC::DoDrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2)
{
// TODO
}
-void wxDC::SetFont(const wxFont& font)
+void wxDC::DoDrawArc( wxCoord x1, wxCoord y1
+ ,wxCoord x2, wxCoord y2
+ ,wxCoord xc, wxCoord yc
+ )
{
// TODO
}
-void wxDC::SetPen(const wxPen& pen)
+void wxDC::DoDrawPoint(wxCoord x, wxCoord y)
{
// TODO
}
-void wxDC::SetBrush(const wxBrush& brush)
+
+void wxDC::DoDrawPolygon(int n, wxPoint points[]
+ ,wxCoord xoffset, wxCoord yoffset
+ ,int fillStyle
+ )
{
// TODO
}
-void wxDC::SetBackground(const wxBrush& brush)
+void wxDC::DoDrawLines( int n, wxPoint points[]
+ ,wxCoord xoffset, wxCoord yoffset
+ )
{
// TODO
}
-void wxDC::SetLogicalFunction(int function)
+void wxDC::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
{
// TODO
}
-void wxDC::SetBackgroundMode(int mode)
+void wxDC::DoDrawRoundedRectangle( wxCoord x, wxCoord y
+ ,wxCoord width, wxCoord height
+ ,double radius
+ )
{
// TODO
}
-void wxDC::SetPalette(const wxPalette& palette)
+void wxDC::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
{
// TODO
}
-void wxDC::DoFloodFill( long x
- ,long y
- ,const wxColour& col
- ,int style
- )
+void wxDC::DoDrawEllipticArc( wxCoord x
+ ,wxCoord y
+ ,wxCoord w
+ ,wxCoord h
+ ,double sa
+ ,double ea
+ )
{
// TODO
}
-bool wxDC::DoGetPixel(long x, long y, wxColour *col) const
+void wxDC::DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y)
{
// TODO
- return(TRUE);
}
-void wxDC::DoDrawPoint(long x, long y)
+void wxDC::DoDrawBitmap( const wxBitmap &bmp
+ ,wxCoord x, wxCoord y
+ ,bool useMask
+ )
{
// TODO
}
-void wxDC::DoDrawLine(long x1, long y1, long x2, long y2)
+void wxDC::DoDrawText(const wxString& text, wxCoord x, wxCoord y)
{
// TODO
}
-void wxDC::DoDrawArc( long x1, long y1
- ,long x2, long y2
- ,long xc, long yc
- )
+// ---------------------------------------------------------------------------
+// set GDI objects
+// ---------------------------------------------------------------------------
+
+void wxDC::SetPalette(const wxPalette& palette)
{
// TODO
}
-void wxDC::DoDrawEllipticArc( long x
- ,long y
- ,long w
- ,long h
- ,double sa
- ,double ea
- )
+void wxDC::SetFont(const wxFont& font)
{
// TODO
}
-void wxDC::DoDrawRectangle(long x, long y, long width, long height)
+void wxDC::SetPen(const wxPen& pen)
{
// TODO
}
-
-void wxDC::DoDrawRoundedRectangle( long x, long y
- ,long width, long height
- ,double radius
- )
+void wxDC::SetBrush(const wxBrush& brush)
{
// TODO
}
-void wxDC::DoDrawEllipse(long x, long y, long width, long height)
+void wxDC::SetBackground(const wxBrush& brush)
{
// TODO
}
-void wxDC::DoCrossHair(long x, long y)
+void wxDC::SetBackgroundMode(int mode)
{
// TODO
}
-void wxDC::DoDrawIcon(const wxIcon& icon, long x, long y)
+void wxDC::SetLogicalFunction(int function)
{
// TODO
}
-void wxDC::DoDrawBitmap( const wxBitmap &bmp
- ,long x, long y
- ,bool useMask
- )
+void wxDC::SetRop(WXHDC dc)
{
- // TODO
+ if (!dc || m_logicalFunction < 0)
+ return;
+
+ int c_rop;
+ // These may be wrong
+ switch (m_logicalFunction)
+ {
+// TODO: Figure this stuff out
+ // case wxXOR: c_rop = R2_XORPEN; break;
+// case wxXOR: c_rop = R2_NOTXORPEN; break;
+// case wxINVERT: c_rop = R2_NOT; break;
+// case wxOR_REVERSE: c_rop = R2_MERGEPENNOT; break;
+// case wxAND_REVERSE: c_rop = R2_MASKPENNOT; break;
+// case wxCLEAR: c_rop = R2_WHITE; break;
+// case wxSET: c_rop = R2_BLACK; break;
+// case wxSRC_INVERT: c_rop = R2_NOTCOPYPEN; break;
+// case wxOR_INVERT: c_rop = R2_MERGENOTPEN; break;
+// case wxAND: c_rop = R2_MASKPEN; break;
+// case wxOR: c_rop = R2_MERGEPEN; break;
+// case wxAND_INVERT: c_rop = R2_MASKNOTPEN; break;
+// case wxEQUIV:
+// case wxNAND:
+// case wxCOPY:
+ default:
+// c_rop = R2_COPYPEN;
+ break;
+ }
+// SetROP2((HDC) dc, c_rop);
}
-void wxDC::DoDrawText(const wxString& text, long x, long y)
+bool wxDC::StartDoc(const wxString& message)
+{
+ // We might be previewing, so return TRUE to let it continue.
+ return TRUE;
+}
+
+void wxDC::EndDoc()
+{
+}
+
+void wxDC::StartPage()
+{
+}
+
+void wxDC::EndPage()
{
- // TODO
}
-bool wxDC::DoBlit( long xdest
- ,long ydest
- ,long width
- ,long height
+// ---------------------------------------------------------------------------
+// text metrics
+// ---------------------------------------------------------------------------
+
+wxCoord wxDC::GetCharHeight() const
+{
+ // TODO
+ return(1);
+}
+
+wxCoord wxDC::GetCharWidth() const
+{
+ // TODO
+ return(1);
+}
+
+void wxDC::DoGetTextExtent( const wxString& string
+ ,wxCoord* x
+ ,wxCoord* y
+ ,wxCoord* decent
+ ,wxCoord* externalLeading
+ ,wxFont* theFont
+ ) const
+{
+ // TODO:
+}
+
+void wxDC::SetMapMode( int mode )
+{
+ // TODO:
+};
+
+void wxDC::SetUserScale(double x, double y)
+{
+ m_userScaleX = x;
+ m_userScaleY = y;
+
+ SetMapMode(m_mappingMode);
+}
+
+void wxDC::SetAxisOrientation(bool xLeftRight, bool yBottomUp)
+{
+ m_signX = xLeftRight ? 1 : -1;
+ m_signY = yBottomUp ? -1 : 1;
+
+ SetMapMode(m_mappingMode);
+}
+
+void wxDC::SetSystemScale(double x, double y)
+{
+ m_scaleX = x;
+ m_scaleY = y;
+
+ SetMapMode(m_mappingMode);
+}
+
+void wxDC::SetLogicalOrigin( wxCoord x, wxCoord y )
+{
+ // TODO:
+};
+
+void wxDC::SetDeviceOrigin( wxCoord x, wxCoord y )
+{
+ // TODO:
+};
+
+// ---------------------------------------------------------------------------
+// coordinates transformations
+// ---------------------------------------------------------------------------
+
+wxCoord wxDCBase::DeviceToLogicalX(wxCoord x) const
+{
+ wxCoord new_x = x - m_deviceOriginX;
+ if (new_x > 0)
+ return (wxCoord)((double)(new_x) / m_scaleX + 0.5) * m_signX + m_logicalOriginX;
+ else
+ return (wxCoord)((double)(new_x) / m_scaleX - 0.5) * m_signX + m_logicalOriginX;
+};
+
+wxCoord wxDCBase::DeviceToLogicalXRel(wxCoord x) const
+{
+ if (x > 0)
+ return (wxCoord)((double)(x) / m_scaleX + 0.5);
+ else
+ return (wxCoord)((double)(x) / m_scaleX - 0.5);
+};
+
+wxCoord wxDCBase::DeviceToLogicalY(wxCoord y) const
+{
+ wxCoord new_y = y - m_deviceOriginY;
+ if (new_y > 0)
+ return (wxCoord)((double)(new_y) / m_scaleY + 0.5) * m_signY + m_logicalOriginY;
+ else
+ return (wxCoord)((double)(new_y) / m_scaleY - 0.5) * m_signY + m_logicalOriginY;
+};
+
+wxCoord wxDCBase::DeviceToLogicalYRel(wxCoord y) const
+{
+ if (y > 0)
+ return (wxCoord)((double)(y) / m_scaleY + 0.5);
+ else
+ return (wxCoord)((double)(y) / m_scaleY - 0.5);
+};
+
+wxCoord wxDCBase::LogicalToDeviceX(wxCoord x) const
+{
+ wxCoord new_x = x - m_logicalOriginX;
+ if (new_x > 0)
+ return (wxCoord)((double)(new_x) * m_scaleX + 0.5) * m_signX + m_deviceOriginX;
+ else
+ return (wxCoord)((double)(new_x) * m_scaleX - 0.5) * m_signX + m_deviceOriginX;
+};
+
+wxCoord wxDCBase::LogicalToDeviceXRel(wxCoord x) const
+{
+ if (x > 0)
+ return (wxCoord)((double)(x) * m_scaleX + 0.5);
+ else
+ return (wxCoord)((double)(x) * m_scaleX - 0.5);
+};
+
+wxCoord wxDCBase::LogicalToDeviceY(wxCoord y) const
+{
+ wxCoord new_y = y - m_logicalOriginY;
+ if (new_y > 0)
+ return (wxCoord)((double)(new_y) * m_scaleY + 0.5) * m_signY + m_deviceOriginY;
+ else
+ return (wxCoord)((double)(new_y) * m_scaleY - 0.5) * m_signY + m_deviceOriginY;
+};
+
+wxCoord wxDCBase::LogicalToDeviceYRel(wxCoord y) const
+{
+ if (y > 0)
+ return (wxCoord)((double)(y) * m_scaleY + 0.5);
+ else
+ return (wxCoord)((double)(y) * m_scaleY - 0.5);
+};
+
+// ---------------------------------------------------------------------------
+// bit blit
+// ---------------------------------------------------------------------------
+
+bool wxDC::DoBlit( wxCoord xdest
+ ,wxCoord ydest
+ ,wxCoord width
+ ,wxCoord height
,wxDC *source
- ,long xsrc
- ,long ysrc
+ ,wxCoord xsrc
+ ,wxCoord ysrc
,int rop
,bool useMask
)
return(TRUE);
}
-void wxDC::DoDrawLines( int n, wxPoint points[]
- ,long xoffset, long yoffset
- )
+void wxDC::DoGetSize( int* width, int* height ) const
{
- // TODO
+ // TODO:
+};
+
+void wxDC::DoGetSizeMM( int* width, int* height ) const
+{
+ // TODO:
+};
+
+wxSize wxDC::GetPPI() const
+{
+ int x = 1;
+ int y = 1;
+ // TODO:
+ return (wxSize(x,y));
}
-void wxDC::DoDrawPolygon(int n, wxPoint points[]
- ,long xoffset, long yoffset
- ,int fillStyle
- )
+void wxDC::SetLogicalScale( double x, double y )
{
- // TODO
+ // TODO:
+};
+
+#if WXWIN_COMPATIBILITY
+void wxDC::DoGetTextExtent(const wxString& string, float *x, float *y,
+ float *descent, float *externalLeading,
+ wxFont *theFont, bool use16bit) const
+{
+ wxCoord x1, y1, descent1, externalLeading1;
+ GetTextExtent(string, & x1, & y1, & descent1, & externalLeading1, theFont, use16bit);
+ *x = x1; *y = y1;
+ if (descent)
+ *descent = descent1;
+ if (externalLeading)
+ *externalLeading = externalLeading1;
}
+#endif
-void wxDC::DoSetClippingRegionAsRegion(const wxRegion& region)
+// ---------------------------------------------------------------------------
+// spline drawing code
+// ---------------------------------------------------------------------------
+
+#if wxUSE_SPLINES
+
+class wxSpline: public wxObject
{
- // TODO
+public:
+ int type;
+ wxList *points;
+
+ wxSpline(wxList *list);
+ void DeletePoints();
+
+ // Doesn't delete points
+ ~wxSpline();
+};
+
+void wx_draw_open_spline(wxDC *dc, wxSpline *spline);
+
+void wx_quadratic_spline(double a1, double b1, double a2, double b2,
+ double a3, double b3, double a4, double b4);
+void wx_clear_stack();
+int wx_spline_pop(double *x1, double *y1, double *x2, double *y2, double *x3,
+ double *y3, double *x4, double *y4);
+void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3,
+ double x4, double y4);
+static bool wx_spline_add_point(double x, double y);
+static void wx_spline_draw_point_array(wxDC *dc);
+wxSpline *wx_make_spline(int x1, int y1, int x2, int y2, int x3, int y3);
+
+void wxDC::DoDrawSpline(wxList *list)
+{
+ wxSpline spline(list);
+
+ wx_draw_open_spline(this, &spline);
}
-void wxDC::DoSetClippingRegion( long x, long y
- ,long width, long height
- )
+wxList wx_spline_point_list;
+
+void wx_draw_open_spline(wxDC *dc, wxSpline *spline)
{
- // TODO
+ wxPoint *p;
+ double cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4;
+ double x1, y1, x2, y2;
+
+ wxNode *node = spline->points->First();
+ p = (wxPoint *)node->Data();
+
+ x1 = p->x;
+ y1 = p->y;
+
+ node = node->Next();
+ p = (wxPoint *)node->Data();
+
+ x2 = p->x;
+ y2 = p->y;
+ cx1 = (double)((x1 + x2) / 2);
+ cy1 = (double)((y1 + y2) / 2);
+ cx2 = (double)((cx1 + x2) / 2);
+ cy2 = (double)((cy1 + y2) / 2);
+
+ wx_spline_add_point(x1, y1);
+
+ while ((node = node->Next()) != NULL)
+ {
+ p = (wxPoint *)node->Data();
+ x1 = x2;
+ y1 = y2;
+ x2 = p->x;
+ y2 = p->y;
+ cx4 = (double)(x1 + x2) / 2;
+ cy4 = (double)(y1 + y2) / 2;
+ cx3 = (double)(x1 + cx4) / 2;
+ cy3 = (double)(y1 + cy4) / 2;
+
+ wx_quadratic_spline(cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4);
+
+ cx1 = cx4;
+ cy1 = cy4;
+ cx2 = (double)(cx1 + x2) / 2;
+ cy2 = (double)(cy1 + y2) / 2;
+ }
+
+ wx_spline_add_point((double)wx_round(cx1), (double)wx_round(cy1));
+ wx_spline_add_point(x2, y2);
+
+ wx_spline_draw_point_array(dc);
+
}
-#if wxUSE_SPLINES
-void wxDC::DoDrawSpline(wxList *points)
+/********************* CURVES FOR SPLINES *****************************
+
+ The following spline drawing routine is from
+
+ "An Algorithm for High-Speed Curve Generation"
+ by George Merrill Chaikin,
+ Computer Graphics and Image Processing, 3, Academic Press,
+ 1974, 346-349.
+
+ and
+
+ "On Chaikin's Algorithm" by R. F. Riesenfeld,
+ Computer Graphics and Image Processing, 4, Academic Press,
+ 1975, 304-310.
+
+***********************************************************************/
+
+#define half(z1, z2) ((z1+z2)/2.0)
+#define THRESHOLD 5
+
+/* iterative version */
+
+void wx_quadratic_spline(double a1, double b1, double a2, double b2, double a3, double b3, double a4,
+ double b4)
{
- // TODO
+ register double xmid, ymid;
+ double x1, y1, x2, y2, x3, y3, x4, y4;
+
+ wx_clear_stack();
+ wx_spline_push(a1, b1, a2, b2, a3, b3, a4, b4);
+
+ while (wx_spline_pop(&x1, &y1, &x2, &y2, &x3, &y3, &x4, &y4)) {
+ xmid = (double)half(x2, x3);
+ ymid = (double)half(y2, y3);
+ if (fabs(x1 - xmid) < THRESHOLD && fabs(y1 - ymid) < THRESHOLD &&
+ fabs(xmid - x4) < THRESHOLD && fabs(ymid - y4) < THRESHOLD) {
+ wx_spline_add_point((double)wx_round(x1), (double)wx_round(y1));
+ wx_spline_add_point((double)wx_round(xmid), (double)wx_round(ymid));
+ } else {
+ wx_spline_push(xmid, ymid, (double)half(xmid, x3), (double)half(ymid, y3),
+ (double)half(x3, x4), (double)half(y3, y4), x4, y4);
+ wx_spline_push(x1, y1, (double)half(x1, x2), (double)half(y1, y2),
+ (double)half(x2, xmid), (double)half(y2, ymid), xmid, ymid);
+ }
+ }
+}
+
+
+/* utilities used by spline drawing routines */
+
+
+typedef struct wx_spline_stack_struct {
+ double x1, y1, x2, y2, x3, y3, x4, y4;
+}
+Stack;
+
+#define SPLINE_STACK_DEPTH 20
+static Stack wx_spline_stack[SPLINE_STACK_DEPTH];
+static Stack *wx_stack_top;
+static int wx_stack_count;
+
+void wx_clear_stack()
+{
+ wx_stack_top = wx_spline_stack;
+ wx_stack_count = 0;
+}
+
+void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4)
+{
+ wx_stack_top->x1 = x1;
+ wx_stack_top->y1 = y1;
+ wx_stack_top->x2 = x2;
+ wx_stack_top->y2 = y2;
+ wx_stack_top->x3 = x3;
+ wx_stack_top->y3 = y3;
+ wx_stack_top->x4 = x4;
+ wx_stack_top->y4 = y4;
+ wx_stack_top++;
+ wx_stack_count++;
+}
+
+int wx_spline_pop(double *x1, double *y1, double *x2, double *y2,
+ double *x3, double *y3, double *x4, double *y4)
+{
+ if (wx_stack_count == 0)
+ return (0);
+ wx_stack_top--;
+ wx_stack_count--;
+ *x1 = wx_stack_top->x1;
+ *y1 = wx_stack_top->y1;
+ *x2 = wx_stack_top->x2;
+ *y2 = wx_stack_top->y2;
+ *x3 = wx_stack_top->x3;
+ *y3 = wx_stack_top->y3;
+ *x4 = wx_stack_top->x4;
+ *y4 = wx_stack_top->y4;
+ return (1);
+}
+
+static bool wx_spline_add_point(double x, double y)
+{
+ wxPoint *point = new wxPoint;
+ point->x = (int) x;
+ point->y = (int) y;
+ wx_spline_point_list.Append((wxObject*)point);
+ return TRUE;
+}
+
+static void wx_spline_draw_point_array(wxDC *dc)
+{
+ dc->DrawLines(&wx_spline_point_list, 0, 0);
+ wxNode *node = wx_spline_point_list.First();
+ while (node)
+ {
+ wxPoint *point = (wxPoint *)node->Data();
+ delete point;
+ delete node;
+ node = wx_spline_point_list.First();
+ }
+}
+
+wxSpline::wxSpline(wxList *list)
+{
+ points = list;
+}
+
+wxSpline::~wxSpline()
+{
+}
+
+void wxSpline::DeletePoints()
+{
+ for(wxNode *node = points->First(); node; node = points->First())
+ {
+ wxPoint *point = (wxPoint *)node->Data();
+ delete point;
+ delete node;
+ }
+ delete points;
}
-#endif
-//
-// Private functions
-//
+#endif // wxUSE_SPLINES
projects / wxWidgets.git / blobdiff