#include "wx/dcscreen.h"
#include "wx/dcprint.h"
#include "wx/prntbase.h"
+#include "wx/scopeguard.h"
#ifndef WX_PRECOMP
#include "wx/math.h"
#include "wx/module.h"
+ #include "wx/window.h"
#endif
+#include "wx/private/textmeasure.h"
+
#ifdef __WXMSW__
#include "wx/msw/dcclient.h"
#include "wx/msw/dcmemory.h"
#include "wx/msw/dcscreen.h"
#endif
-#ifdef __WXGTK__
+#ifdef __WXGTK3__
+ #include "wx/gtk/dc.h"
+#elif defined __WXGTK20__
#include "wx/gtk/dcclient.h"
#include "wx/gtk/dcmemory.h"
#include "wx/gtk/dcscreen.h"
+#elif defined(__WXGTK__)
+ #include "wx/gtk1/dcclient.h"
+ #include "wx/gtk1/dcmemory.h"
+ #include "wx/gtk1/dcscreen.h"
#endif
#ifdef __WXMAC__
- #include "wx/mac/dcclient.h"
- #include "wx/mac/dcmemory.h"
- #include "wx/mac/dcscreen.h"
+ #include "wx/osx/dcclient.h"
+ #include "wx/osx/dcmemory.h"
+ #include "wx/osx/dcscreen.h"
+#endif
+
+#ifdef __WXPM__
+ #include "wx/os2/dcclient.h"
+ #include "wx/os2/dcmemory.h"
+ #include "wx/os2/dcscreen.h"
#endif
#ifdef __WXCOCOA__
#include "wx/cocoa/dcscreen.h"
#endif
+#ifdef __WXMOTIF__
+ #include "wx/motif/dcclient.h"
+ #include "wx/motif/dcmemory.h"
+ #include "wx/motif/dcscreen.h"
+#endif
+
#ifdef __WXX11__
#include "wx/x11/dcclient.h"
#include "wx/x11/dcmemory.h"
#include "wx/x11/dcscreen.h"
#endif
+#ifdef __WXDFB__
+ #include "wx/dfb/dcclient.h"
+ #include "wx/dfb/dcmemory.h"
+ #include "wx/dfb/dcscreen.h"
+#endif
+
//----------------------------------------------------------------------------
// wxDCFactory
//----------------------------------------------------------------------------
// wxNativeDCFactory
//-----------------------------------------------------------------------------
-wxDCImpl* wxNativeDCFactory::CreateWindowDC( wxWindowDC *owner )
-{
- return new wxWindowDCImpl( owner );
-}
-
wxDCImpl* wxNativeDCFactory::CreateWindowDC( wxWindowDC *owner, wxWindow *window )
{
- return new wxWindowDCImpl( owner, window );
-}
-
-wxDCImpl* wxNativeDCFactory::CreateClientDC( wxClientDC *owner )
-{
- return new wxClientDCImpl( owner );
+ wxDCImpl * const impl = new wxWindowDCImpl( owner, window );
+ impl->InheritAttributes(window);
+ return impl;
}
wxDCImpl* wxNativeDCFactory::CreateClientDC( wxClientDC *owner, wxWindow *window )
{
- return new wxClientDCImpl( owner, window );
-}
-
-wxDCImpl* wxNativeDCFactory::CreatePaintDC( wxPaintDC *owner )
-{
- return new wxPaintDCImpl( owner );
+ wxDCImpl * const impl = new wxClientDCImpl( owner, window );
+ impl->InheritAttributes(window);
+ return impl;
}
wxDCImpl* wxNativeDCFactory::CreatePaintDC( wxPaintDC *owner, wxWindow *window )
{
- return new wxPaintDCImpl( owner, window );
+ wxDCImpl * const impl = new wxPaintDCImpl( owner, window );
+ impl->InheritAttributes(window);
+ return impl;
}
wxDCImpl* wxNativeDCFactory::CreateMemoryDC( wxMemoryDC *owner )
return new wxMemoryDCImpl( owner );
}
-wxDCImpl* wxNativeDCFactory::CreateMemoryDC( wxMemoryDC *owner, wxBitmap &bitmap )
+wxDCImpl* wxNativeDCFactory::CreateMemoryDC(wxMemoryDC *owner, wxBitmap& bitmap)
{
- return new wxMemoryDCImpl( owner, bitmap );
+ // the bitmap may be modified when it's selected into a memory DC so make
+ // sure changing this bitmap doesn't affect any other shallow copies of it
+ // (see wxMemoryDC::SelectObject())
+ //
+ // notice that we don't provide any ctor equivalent to SelectObjectAsSource
+ // method because this should be rarely needed and easy to work around by
+ // using the default ctor and calling SelectObjectAsSource itself
+ if ( bitmap.IsOk() )
+ bitmap.UnShare();
+
+ return new wxMemoryDCImpl(owner, bitmap);
}
wxDCImpl* wxNativeDCFactory::CreateMemoryDC( wxMemoryDC *owner, wxDC *dc )
void wxMemoryDC::SelectObject(wxBitmap& bmp)
{
+ if ( bmp.IsSameAs(GetSelectedBitmap()) )
+ {
+ // Nothing to do, this bitmap is already selected.
+ return;
+ }
+
// make sure that the given wxBitmap is not sharing its data with other
// wxBitmap instances as its contents will be modified by any drawing
// operation done on this DC
{
}
-wxRect wxPrinterDC::GetPaperRect()
+wxRect wxPrinterDC::GetPaperRect() const
{
return GetImpl()->GetPaperRect();
}
-int wxPrinterDC::GetResolution()
+int wxPrinterDC::GetResolution() const
{
return GetImpl()->GetResolution();
}
, 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_backgroundMode(wxBRUSHSTYLE_TRANSPARENT)
, m_mappingMode(wxMM_TEXT)
, m_pen()
, m_brush()
- , m_backgroundBrush(*wxTRANSPARENT_BRUSH)
+ , m_backgroundBrush()
, m_textForegroundColour(*wxBLACK)
, m_textBackgroundColour(*wxWHITE)
, m_font()
{
}
+// ----------------------------------------------------------------------------
+// clipping
+// ----------------------------------------------------------------------------
+
+void wxDCImpl::DoSetClippingRegion(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
+{
+ if ( m_clipping )
+ {
+ m_clipX1 = wxMax( m_clipX1, x );
+ m_clipY1 = wxMax( m_clipY1, y );
+ m_clipX2 = wxMin( m_clipX2, (x + w) );
+ m_clipY2 = wxMin( m_clipY2, (y + h) );
+ }
+ else
+ {
+ m_clipping = true;
+
+ m_clipX1 = x;
+ m_clipY1 = y;
+ m_clipX2 = x + w;
+ m_clipY2 = y + h;
+ }
+}
+
// ----------------------------------------------------------------------------
// coordinate conversions and transforms
// ----------------------------------------------------------------------------
wxCoord wxDCImpl::DeviceToLogicalX(wxCoord x) const
{
- return wxRound((double)(x - m_deviceOriginX - m_deviceLocalOriginX) / m_scaleX) * m_signX + m_logicalOriginX;
+ return wxRound( (double)((x - m_deviceOriginX - m_deviceLocalOriginX) * m_signX) / m_scaleX ) + m_logicalOriginX ;
}
wxCoord wxDCImpl::DeviceToLogicalY(wxCoord y) const
{
- return wxRound((double)(y - m_deviceOriginY - m_deviceLocalOriginY) / m_scaleY) * m_signY + m_logicalOriginY;
+ return wxRound( (double)((y - m_deviceOriginY - m_deviceLocalOriginY) * m_signY) / m_scaleY ) + m_logicalOriginY ;
}
wxCoord wxDCImpl::DeviceToLogicalXRel(wxCoord x) const
wxCoord wxDCImpl::LogicalToDeviceX(wxCoord x) const
{
- return wxRound((double)(x - m_logicalOriginX) * m_scaleX) * m_signX + m_deviceOriginX * m_signY + m_deviceLocalOriginX;
+ return wxRound( (double)((x - m_logicalOriginX) * m_signX) * m_scaleX) + m_deviceOriginX + m_deviceLocalOriginX;
}
wxCoord wxDCImpl::LogicalToDeviceY(wxCoord y) const
{
- return wxRound((double)(y - m_logicalOriginY) * m_scaleY) * m_signY + m_deviceOriginY * m_signY + m_deviceLocalOriginY;
+ return wxRound( (double)((y - m_logicalOriginY) * m_signY) * m_scaleY) + m_deviceOriginY + m_deviceLocalOriginY;
}
wxCoord wxDCImpl::LogicalToDeviceXRel(wxCoord x) const
m_scaleY = m_logicalScaleY * m_userScaleY;
}
-void wxDCImpl::SetMapMode( int mode )
+void wxDCImpl::SetMapMode( wxMappingMode mode )
{
switch (mode)
{
ComputeScaleAndOrigin();
}
-
-// Each element of the widths array will be the width of the string up to and
-// including the corresponding character in text. This is the generic
-// implementation, the port-specific classes should do this with native APIs
-// if available and if faster. Note: pango_layout_index_to_pos is much slower
-// than calling GetTextExtent!!
-
-#define FWC_SIZE 256
-
-class FontWidthCache
-{
-public:
- FontWidthCache() : m_scaleX(1), m_widths(NULL) { }
- ~FontWidthCache() { delete []m_widths; }
-
- void Reset()
- {
- if (!m_widths)
- m_widths = new int[FWC_SIZE];
-
- memset(m_widths, 0, sizeof(int)*FWC_SIZE);
- }
-
- wxFont m_font;
- double m_scaleX;
- int *m_widths;
-};
-
-static FontWidthCache s_fontWidthCache;
-
bool wxDCImpl::DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
{
- int totalWidth = 0;
-
- const size_t len = text.length();
- widths.Empty();
- widths.Add(0, len);
-
- // reset the cache if font or horizontal scale have changed
- if ( !s_fontWidthCache.m_widths ||
- !wxIsSameDouble(s_fontWidthCache.m_scaleX, m_scaleX) ||
- (s_fontWidthCache.m_font != GetFont()) )
- {
- s_fontWidthCache.Reset();
- s_fontWidthCache.m_font = GetFont();
- s_fontWidthCache.m_scaleX = m_scaleX;
- }
-
- // Calculate the position of each character based on the widths of
- // the previous characters
- int w, h;
- for ( size_t i = 0; i < len; i++ )
- {
- const wxChar c = text[i];
- unsigned int c_int = (unsigned int)c;
-
- if ((c_int < FWC_SIZE) && (s_fontWidthCache.m_widths[c_int] != 0))
- {
- w = s_fontWidthCache.m_widths[c_int];
- }
- else
- {
- DoGetTextExtent(c, &w, &h);
- if (c_int < FWC_SIZE)
- s_fontWidthCache.m_widths[c_int] = w;
- }
-
- totalWidth += w;
- widths[i] = totalWidth;
- }
-
- return true;
+ wxTextMeasure tm(GetOwner(), &m_font);
+ return tm.GetPartialTextExtents(text, widths, m_scaleX);
}
void wxDCImpl::GetMultiLineTextExtent(const wxString& text,
wxCoord *h,
const wxFont *font) const
{
- wxCoord widthTextMax = 0, widthLine,
- heightTextTotal = 0, heightLineDefault = 0, heightLine = 0;
-
- wxString curLine;
- for ( wxString::const_iterator pc = text.begin(); ; ++pc )
- {
- if ( pc == text.end() || *pc == _T('\n') )
- {
- if ( curLine.empty() )
- {
- // we can't use GetTextExtent - it will return 0 for both width
- // and height and an empty line should count in height
- // calculation
-
- // assume that this line has the same height as the previous
- // one
- if ( !heightLineDefault )
- heightLineDefault = heightLine;
-
- if ( !heightLineDefault )
- {
- // but we don't know it yet - choose something reasonable
- DoGetTextExtent(_T("W"), NULL, &heightLineDefault,
- NULL, NULL, font);
- }
-
- heightTextTotal += heightLineDefault;
- }
- else
- {
- DoGetTextExtent(curLine, &widthLine, &heightLine,
- NULL, NULL, font);
- if ( widthLine > widthTextMax )
- widthTextMax = widthLine;
- heightTextTotal += heightLine;
- }
-
- if ( pc == text.end() )
- {
- break;
- }
- else // '\n'
- {
- curLine.clear();
- }
- }
- else
- {
- curLine += *pc;
- }
- }
-
- if ( x )
- *x = widthTextMax;
- if ( y )
- *y = heightTextTotal;
- if ( h )
- *h = heightLine;
+ wxTextMeasure tm(GetOwner(), font && font->IsOk() ? font : &m_font);
+ tm.GetMultiLineTextExtent(text, x, y, h);
}
void wxDCImpl::DoDrawCheckMark(wxCoord x1, wxCoord y1,
wxDC *source,
wxCoord xsrc, wxCoord ysrc,
wxCoord srcWidth, wxCoord srcHeight,
- int rop,
+ wxRasterOperationMode rop,
bool useMask,
wxCoord xsrcMask,
wxCoord ysrcMask)
{
wxCHECK_MSG( srcWidth && srcHeight && dstWidth && dstHeight, false,
- _T("invalid blit size") );
+ wxT("invalid blit size") );
// emulate the stretching by modifying the DC scale
double xscale = (double)srcWidth/dstWidth,
void wxDCImpl::DrawPolygon(const wxPointList *list,
wxCoord xoffset, wxCoord yoffset,
- int fillStyle)
+ wxPolygonFillMode fillStyle)
{
int n = list->GetCount();
wxPoint *points = new wxPoint[n];
int count[],
wxPoint points[],
wxCoord xoffset, wxCoord yoffset,
- int fillStyle)
+ wxPolygonFillMode fillStyle)
{
if ( n == 1 )
{
int i, j, lastOfs;
wxPoint* pts;
- wxPen pen;
for (i = j = lastOfs = 0; i < n; i++)
{
pts[j++] = pts[lastOfs];
}
- pen = GetPen();
- SetPen(wxPen(*wxBLACK, 0, wxTRANSPARENT));
- DoDrawPolygon(j, pts, xoffset, yoffset, fillStyle);
- SetPen(pen);
+ {
+ wxDCPenChanger setTransp(*m_owner, *wxTRANSPARENT_PEN);
+ DoDrawPolygon(j, pts, xoffset, yoffset, fillStyle);
+ }
+
for (i = j = 0; i < n; i++)
{
DoDrawLines(count[i], pts+j, xoffset, yoffset);
#if wxUSE_SPLINES
-void wxDCImpl::DoDrawSpline(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2, wxCoord x3, wxCoord y3)
+void wxDCImpl::DrawSpline(wxCoord x1, wxCoord y1,
+ wxCoord x2, wxCoord y2,
+ wxCoord x3, wxCoord y3)
{
- wxPointList point_list;
-
- wxPoint *point1 = new wxPoint;
- point1->x = x1; point1->y = y1;
- point_list.Append( point1 );
-
- wxPoint *point2 = new wxPoint;
- point2->x = x2; point2->y = y2;
- point_list.Append( point2 );
-
- wxPoint *point3 = new wxPoint;
- point3->x = x3; point3->y = y3;
- point_list.Append( point3 );
-
- DoDrawSpline(&point_list);
-
- for( wxPointList::compatibility_iterator node = point_list.GetFirst(); node; node = node->GetNext() )
- {
- wxPoint *p = node->GetData();
- delete p;
- }
+ wxPoint points[] = { wxPoint(x1, y1), wxPoint(x2, y2), wxPoint(x3, y3) };
+ DrawSpline(WXSIZEOF(points), points);
}
-void wxDCImpl::DoDrawSpline(int n, wxPoint points[])
+void wxDCImpl::DrawSpline(int n, wxPoint points[])
{
wxPointList list;
- for (int i =0; i < n; i++)
- list.Append( &points[i] );
+ for ( int i = 0; i < n; i++ )
+ list.Append(&points[i]);
- DoDrawSpline(&list);
+ DrawSpline(&list);
}
// ----------------------------------- spline code ----------------------------------------
static bool wx_spline_add_point(double x, double y);
static void wx_spline_draw_point_array(wxDC *dc);
-wxPointList wx_spline_point_list;
+static wxPointList wx_spline_point_list;
#define half(z1, z2) ((z1+z2)/2.0)
#define THRESHOLD 5
wx_spline_add_point(x1, y1);
while ((node = node->GetNext())
-#if !wxUSE_STL
+#if !wxUSE_STD_CONTAINERS
!= NULL
-#endif // !wxUSE_STL
+#endif // !wxUSE_STD_CONTAINERS
)
{
p = node->GetData();
nB = nB1 + (nB2-nB1)*(w-x)/w;
wxColour colour(nR,nG,nB);
- SetPen(wxPen(colour, 1, wxSOLID));
+ SetPen(wxPen(colour, 1, wxPENSTYLE_SOLID));
SetBrush(wxBrush(colour));
if(nDirection == wxEAST)
DoDrawRectangle(rect.GetRight()-x-xDelta+1, rect.GetTop(),
nB = nB1 + (nB2-nB1)*(w-y)/w;
wxColour colour(nR,nG,nB);
- SetPen(wxPen(colour, 1, wxSOLID));
+ SetPen(wxPen(colour, 1, wxPENSTYLE_SOLID));
SetBrush(wxBrush(colour));
if(nDirection == wxNORTH)
DoDrawRectangle(rect.GetLeft(), rect.GetTop()+y,
const wxColour& destColour,
const wxPoint& circleCenter)
{
- //save the old pen color
- wxColour oldPenColour = m_pen.GetColour();
+ // save the old pen and ensure it is restored on exit
+ const wxPen penOrig = m_pen;
+ wxON_BLOCK_EXIT_SET(m_pen, penOrig);
wxUint8 nR1 = destColour.Red();
wxUint8 nG1 = destColour.Green();
//Radius
- wxInt32 cx = rect.GetWidth() / 2;
- wxInt32 cy = rect.GetHeight() / 2;
- wxInt32 nRadius;
+ double cx = rect.GetWidth() / 2;
+ double cy = rect.GetHeight() / 2;
+ double dRadius;
if (cx < cy)
- nRadius = cx;
+ dRadius = cx;
else
- nRadius = cy;
+ dRadius = cy;
//Offset of circle
- wxInt32 nCircleOffX = circleCenter.x - (rect.GetWidth() / 2);
- wxInt32 nCircleOffY = circleCenter.y - (rect.GetHeight() / 2);
+ double ptX, ptY;
+ ptX = circleCenter.x;
+ ptY = circleCenter.y;
+ double nCircleOffX = ptX - cx;
+ double nCircleOffY = ptY - cy;
+
+ double dGradient;
+ double dx, dy;
for ( wxInt32 x = 0; x < rect.GetWidth(); x++ )
{
for ( wxInt32 y = 0; y < rect.GetHeight(); y++ )
{
//get color difference
- wxInt32 nGradient = ((nRadius -
- (wxInt32)sqrt(
- pow((double)(x - cx - nCircleOffX), 2) +
- pow((double)(y - cy - nCircleOffY), 2)
- )) * 100) / nRadius;
+ dx = x;
+ dy = y;
+
+ dGradient = ((dRadius - sqrt( (dx - cx - nCircleOffX) * (dx - cx - nCircleOffX)
+ +(dy - cy - nCircleOffY) * (dy - cy - nCircleOffY)
+ )
+ ) * 100
+ ) / dRadius;
//normalize Gradient
- if (nGradient < 0 )
- nGradient = 0;
+ if (dGradient < 0)
+ dGradient = 0.0;
//get dest colors
- nR = (wxUint8)(nR1 + ((nR2 - nR1) * nGradient / 100));
- nG = (wxUint8)(nG1 + ((nG2 - nG1) * nGradient / 100));
- nB = (wxUint8)(nB1 + ((nB2 - nB1) * nGradient / 100));
+ nR = (wxUint8)(nR1 + ((nR2 - nR1) * dGradient / 100));
+ nG = (wxUint8)(nG1 + ((nG2 - nG1) * dGradient / 100));
+ nB = (wxUint8)(nB1 + ((nB2 - nB1) * dGradient / 100));
//set the pixel
- m_pen.SetColour(wxColour(nR,nG,nB));
+ SetPen(wxColour(nR,nG,nB));
DoDrawPoint(x + rect.GetLeft(), y + rect.GetTop());
}
}
- //return old pen color
- m_pen.SetColour(oldPenColour);
+}
+
+void wxDCImpl::InheritAttributes(wxWindow *win)
+{
+ wxCHECK_RET( win, "window can't be NULL" );
+
+ SetFont(win->GetFont());
+ SetTextForeground(win->GetForegroundColour());
+ SetTextBackground(win->GetBackgroundColour());
+ SetBackground(win->GetBackgroundColour());
+ SetLayoutDirection(win->GetLayoutDirection());
+}
+
+void wxDCImpl::DoGetFontMetrics(int *height,
+ int *ascent,
+ int *descent,
+ int *internalLeading,
+ int *externalLeading,
+ int *averageWidth) const
+{
+ // Average width is typically the same as width of 'x'.
+ wxCoord h, d;
+ DoGetTextExtent("x", averageWidth, &h, &d, externalLeading);
+
+ if ( height )
+ *height = h;
+ if ( ascent )
+ *ascent = h - d;
+ if ( descent )
+ *descent = d;
+ if ( internalLeading )
+ *internalLeading = 0;
}
//-----------------------------------------------------------------------------
IMPLEMENT_ABSTRACT_CLASS(wxDC, wxObject)
+void wxDC::CopyAttributes(const wxDC& dc)
+{
+ SetFont(dc.GetFont());
+ SetTextForeground(dc.GetTextForeground());
+ SetTextBackground(dc.GetTextBackground());
+ SetBackground(dc.GetBackground());
+ SetLayoutDirection(dc.GetLayoutDirection());
+}
+
void wxDC::DrawLabel(const wxString& text,
const wxBitmap& bitmap,
const wxRect& rect,
GetMultiLineTextExtent(text, &widthText, &heightText, &heightLine);
wxCoord width, height;
- if ( bitmap.Ok() )
+ if ( bitmap.IsOk() )
{
width = widthText + bitmap.GetWidth();
height = bitmap.GetHeight();
wxCoord x0 = x,
y0 = y,
width0 = width;
- if ( bitmap.Ok() )
+ if ( bitmap.IsOk() )
{
DrawBitmap(bitmap, x, y, true /* use mask */);
yUnderscore = 0;
// split the string into lines and draw each of them separately
+ //
+ // NB: while wxDC::DrawText() on some platforms supports drawing multi-line
+ // strings natively, this is not the case for all of them, notably not
+ // wxMSW which uses this function for multi-line texts, so we may only
+ // call DrawText() for single-line strings from here to avoid infinite
+ // recursion.
wxString curLine;
for ( wxString::const_iterator pc = text.begin(); ; ++pc )
{
- if ( *pc == _T('\n') || pc == text.end() )
+ if ( pc == text.end() || *pc == '\n' )
{
int xRealStart = x; // init it here to avoid compielr warnings
{
if ( pc - text.begin() == indexAccel )
{
- // remeber to draw underscore here
+ // remember to draw underscore here
GetTextExtent(curLine, &startUnderscore, NULL);
curLine += *pc;
GetTextExtent(curLine, &endUnderscore, NULL);
if ( startUnderscore != endUnderscore )
{
// it should be of the same colour as text
- SetPen(wxPen(GetTextForeground(), 0, wxSOLID));
+ SetPen(wxPen(GetTextForeground(), 0, wxPENSTYLE_SOLID));
- yUnderscore--;
+ // This adjustment is relatively arbitrary: we need to draw the
+ // underline slightly higher to avoid overflowing the character cell
+ // but whether we should do it 1, 2 or 3 pixels higher is not clear.
+ //
+ // The currently used value seems to be compatible with native MSW
+ // behaviour, i.e. it results in the same appearance of the owner-drawn
+ // and normal labels.
+ yUnderscore -= 2;
DrawLine(startUnderscore, yUnderscore, endUnderscore, yUnderscore);
}
if (h) *h = hh;
}
+void wxDC::DrawObject(wxDrawObject* drawobject)
+{
+ drawobject->Draw(*this);
+ CalcBoundingBox(drawobject->MinX(),drawobject->MinY());
+ CalcBoundingBox(drawobject->MaxX(),drawobject->MaxY());
+}
+
#endif // WXWIN_COMPATIBILITY_2_8
+
+/*
+Notes for wxWidgets DrawEllipticArcRot(...)
+
+wxDCBase::DrawEllipticArcRot(...) draws a rotated elliptic arc or an ellipse.
+It uses wxDCBase::CalculateEllipticPoints(...) and wxDCBase::Rotate(...),
+which are also new.
+
+All methods are generic, so they can be implemented in wxDCBase.
+DoDrawEllipticArcRot(...) is virtual, so it can be called from deeper
+methods like (WinCE) wxDC::DoDrawArc(...).
+
+CalculateEllipticPoints(...) fills a given list of wxPoints with some points
+of an elliptic arc. The algorithm is pixel-based: In every row (in flat
+parts) or every column (in steep parts) only one pixel is calculated.
+Trigonometric calculation (sin, cos, tan, atan) is only done if the
+starting angle is not equal to the ending angle. The calculation of the
+pixels is done using simple arithmetic only and should perform not too
+bad even on devices without floating point processor. I didn't test this yet.
+
+Rotate(...) rotates a list of point pixel-based, you will see rounding errors.
+For instance: an ellipse rotated 180 degrees is drawn
+slightly different from the original.
+
+The points are then moved to an array and used to draw a polyline and/or polygon
+(with center added, the pie).
+The result looks quite similar to the native ellipse, only e few pixels differ.
+
+The performance on a desktop system (Athlon 1800, WinXP) is about 7 times
+slower as DrawEllipse(...), which calls the native API.
+An rotated ellipse outside the clipping region takes nearly the same time,
+while an native ellipse outside takes nearly no time to draw.
+
+If you draw an arc with this new method, you will see the starting and ending angles
+are calculated properly.
+If you use DrawEllipticArc(...), you will see they are only correct for circles
+and not properly calculated for ellipses.
+
+Peter Lenhard
+p.lenhard@t-online.de
+*/
+
+#ifdef __WXWINCE__
+void wxDCImpl::DoDrawEllipticArcRot( wxCoord x, wxCoord y,
+ wxCoord w, wxCoord h,
+ double sa, double ea, double angle )
+{
+ wxPointList list;
+
+ CalculateEllipticPoints( &list, x, y, w, h, sa, ea );
+ Rotate( &list, angle, wxPoint( x+w/2, y+h/2 ) );
+
+ // Add center (for polygon/pie)
+ list.Append( new wxPoint( x+w/2, y+h/2 ) );
+
+ // copy list into array and delete list elements
+ int n = list.GetCount();
+ wxPoint *points = new wxPoint[n];
+ int i = 0;
+ wxPointList::compatibility_iterator node;
+ for ( node = list.GetFirst(); node; node = node->GetNext(), i++ )
+ {
+ wxPoint *point = node->GetData();
+ points[i].x = point->x;
+ points[i].y = point->y;
+ delete point;
+ }
+
+ // first draw the pie without pen, if necessary
+ if( GetBrush() != *wxTRANSPARENT_BRUSH )
+ {
+ wxPen tempPen( GetPen() );
+ SetPen( *wxTRANSPARENT_PEN );
+ DoDrawPolygon( n, points, 0, 0 );
+ SetPen( tempPen );
+ }
+
+ // then draw the arc without brush, if necessary
+ if( GetPen() != *wxTRANSPARENT_PEN )
+ {
+ // without center
+ DoDrawLines( n-1, points, 0, 0 );
+ }
+
+ delete [] points;
+
+} // DrawEllipticArcRot
+
+void wxDCImpl::Rotate( wxPointList* points, double angle, wxPoint center )
+{
+ if( angle != 0.0 )
+ {
+ double pi(M_PI);
+ double dSinA = -sin(angle*2.0*pi/360.0);
+ double dCosA = cos(angle*2.0*pi/360.0);
+ wxPointList::compatibility_iterator node;
+ for ( node = points->GetFirst(); node; node = node->GetNext() )
+ {
+ wxPoint* point = node->GetData();
+
+ // transform coordinates, if necessary
+ if( center.x ) point->x -= center.x;
+ if( center.y ) point->y -= center.y;
+
+ // calculate rotation, rounding simply by implicit cast to integer
+ int xTemp = point->x * dCosA - point->y * dSinA;
+ point->y = point->x * dSinA + point->y * dCosA;
+ point->x = xTemp;
+
+ // back transform coordinates, if necessary
+ if( center.x ) point->x += center.x;
+ if( center.y ) point->y += center.y;
+ }
+ }
+}
+
+void wxDCImpl::CalculateEllipticPoints( wxPointList* points,
+ wxCoord xStart, wxCoord yStart,
+ wxCoord w, wxCoord h,
+ double sa, double ea )
+{
+ double pi = M_PI;
+ double sar = 0;
+ double ear = 0;
+ int xsa = 0;
+ int ysa = 0;
+ int xea = 0;
+ int yea = 0;
+ int sq = 0;
+ int eq = 0;
+ bool bUseAngles = false;
+ if( w<0 ) w = -w;
+ if( h<0 ) h = -h;
+ // half-axes
+ wxCoord a = w/2;
+ wxCoord b = h/2;
+ // decrement 1 pixel if ellipse is smaller than 2*a, 2*b
+ int decrX = 0;
+ if( 2*a == w ) decrX = 1;
+ int decrY = 0;
+ if( 2*b == h ) decrY = 1;
+ // center
+ wxCoord xCenter = xStart + a;
+ wxCoord yCenter = yStart + b;
+ // calculate data for start and end, if necessary
+ if( sa != ea )
+ {
+ bUseAngles = true;
+ // normalisation of angles
+ while( sa<0 ) sa += 360;
+ while( ea<0 ) ea += 360;
+ while( sa>=360 ) sa -= 360;
+ while( ea>=360 ) ea -= 360;
+ // calculate quadrant numbers
+ if( sa > 270 ) sq = 3;
+ else if( sa > 180 ) sq = 2;
+ else if( sa > 90 ) sq = 1;
+ if( ea > 270 ) eq = 3;
+ else if( ea > 180 ) eq = 2;
+ else if( ea > 90 ) eq = 1;
+ sar = sa * pi / 180.0;
+ ear = ea * pi / 180.0;
+ // correct angle circle -> ellipse
+ sar = atan( -a/(double)b * tan( sar ) );
+ if ( sq == 1 || sq == 2 ) sar += pi;
+ ear = atan( -a/(double)b * tan( ear ) );
+ if ( eq == 1 || eq == 2 ) ear += pi;
+ // coordinates of points
+ xsa = xCenter + a * cos( sar );
+ if( sq == 0 || sq == 3 ) xsa -= decrX;
+ ysa = yCenter + b * sin( sar );
+ if( sq == 2 || sq == 3 ) ysa -= decrY;
+ xea = xCenter + a * cos( ear );
+ if( eq == 0 || eq == 3 ) xea -= decrX;
+ yea = yCenter + b * sin( ear );
+ if( eq == 2 || eq == 3 ) yea -= decrY;
+ } // if iUseAngles
+ // calculate c1 = b^2, c2 = b^2/a^2 with a = w/2, b = h/2
+ double c1 = b * b;
+ double c2 = 2.0 / w;
+ c2 *= c2;
+ c2 *= c1;
+ wxCoord x = 0;
+ wxCoord y = b;
+ long x2 = 1;
+ long y2 = y*y;
+ long y2_old = 0;
+ long y_old = 0;
+ // Lists for quadrant 1 to 4
+ wxPointList pointsarray[4];
+ // Calculate points for first quadrant and set in all quadrants
+ for( x = 0; x <= a; ++x )
+ {
+ x2 = x2+x+x-1;
+ y2_old = y2;
+ y_old = y;
+ bool bNewPoint = false;
+ while( y2 > c1 - c2 * x2 && y > 0 )
+ {
+ bNewPoint = true;
+ y2 = y2-y-y+1;
+ --y;
+ }
+ // old y now too big: set point with old y, old x
+ if( bNewPoint && x>1)
+ {
+ int x1 = x - 1;
+ // remove points on the same line
+ pointsarray[0].Insert( new wxPoint( xCenter + x1 - decrX, yCenter - y_old ) );
+ pointsarray[1].Append( new wxPoint( xCenter - x1, yCenter - y_old ) );
+ pointsarray[2].Insert( new wxPoint( xCenter - x1, yCenter + y_old - decrY ) );
+ pointsarray[3].Append( new wxPoint( xCenter + x1 - decrX, yCenter + y_old - decrY ) );
+ } // set point
+ } // calculate point
+
+ // Starting and/or ending points for the quadrants, first quadrant gets both.
+ pointsarray[0].Insert( new wxPoint( xCenter + a - decrX, yCenter ) );
+ pointsarray[0].Append( new wxPoint( xCenter, yCenter - b ) );
+ pointsarray[1].Append( new wxPoint( xCenter - a, yCenter ) );
+ pointsarray[2].Append( new wxPoint( xCenter, yCenter + b - decrY ) );
+ pointsarray[3].Append( new wxPoint( xCenter + a - decrX, yCenter ) );
+
+ // copy quadrants in original list
+ if( bUseAngles )
+ {
+ // Copy the right part of the points in the lists
+ // and delete the wxPoints, because they do not leave this method.
+ points->Append( new wxPoint( xsa, ysa ) );
+ int q = sq;
+ bool bStarted = false;
+ bool bReady = false;
+ bool bForceTurn = ( sq == eq && sa > ea );
+ while( !bReady )
+ {
+ wxPointList::compatibility_iterator node;
+ for( node = pointsarray[q].GetFirst(); node; node = node->GetNext() )
+ {
+ // once: go to starting point in start quadrant
+ if( !bStarted &&
+ (
+ node->GetData()->x < xsa+1 && q <= 1
+ ||
+ node->GetData()->x > xsa-1 && q >= 2
+ )
+ )
+ {
+ bStarted = true;
+ }
+
+ // copy point, if not at ending point
+ if( bStarted )
+ {
+ if( q != eq || bForceTurn
+ ||
+ ( (wxPoint*) node->GetData() )->x > xea+1 && q <= 1
+ ||
+ ( (wxPoint*) node->GetData() )->x < xea-1 && q >= 2
+ )
+ {
+ // copy point
+ wxPoint* pPoint = new wxPoint( *(node->GetData()) );
+ points->Append( pPoint );
+ }
+ else if( q == eq && !bForceTurn || node->GetData()->x == xea)
+ {
+ bReady = true;
+ }
+ }
+ } // for node
+ ++q;
+ if( q > 3 ) q = 0;
+ bForceTurn = false;
+ bStarted = true;
+ } // while not bReady
+ points->Append( new wxPoint( xea, yea ) );
+
+ // delete points
+ for( q = 0; q < 4; ++q )
+ {
+ wxPointList::compatibility_iterator node;
+ for( node = pointsarray[q].GetFirst(); node; node = node->GetNext() )
+ {
+ wxPoint *p = node->GetData();
+ delete p;
+ }
+ }
+ }
+ else
+ {
+ wxPointList::compatibility_iterator node;
+ // copy whole ellipse, wxPoints will be deleted outside
+ for( node = pointsarray[0].GetFirst(); node; node = node->GetNext() )
+ {
+ wxPoint *p = node->GetData();
+ points->Append( p );
+ }
+ for( node = pointsarray[1].GetFirst(); node; node = node->GetNext() )
+ {
+ wxPoint *p = node->GetData();
+ points->Append( p );
+ }
+ for( node = pointsarray[2].GetFirst(); node; node = node->GetNext() )
+ {
+ wxPoint *p = node->GetData();
+ points->Append( p );
+ }
+ for( node = pointsarray[3].GetFirst(); node; node = node->GetNext() )
+ {
+ wxPoint *p = node->GetData();
+ points->Append( p );
+ }
+ } // not iUseAngles
+} // CalculateEllipticPoints
+
+#endif // __WXWINCE__
+
+float wxDCImpl::GetFontPointSizeAdjustment(float dpi)
+{
+ // wxMSW has long-standing bug where wxFont point size is interpreted as
+ // "pixel size corresponding to given point size *on screen*". In other
+ // words, on a typical 600dpi printer and a typical 96dpi screen, fonts
+ // are ~6 times smaller when printing. Unfortunately, this bug is so severe
+ // that *all* printing code has to account for it and consequently, other
+ // ports need to emulate this bug too:
+ const wxSize screenPPI = wxGetDisplayPPI();
+ return float(screenPPI.y) / dpi;
+}
projects / wxWidgets.git / blobdiff