Amebis/wxWidgets
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
Files
0f820c97cacb0a0ba4346531dd8e34d74e1f14a0
wxWidgets/src/msw/dc.cpp
Robert Roebling 0f820c97ca Reverted Vadims change for the size of filled 
rects, the are the same now on GTK and Win95.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@5991 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2000-02-13 14:50:47 +00:00

1710 lines
48 KiB
C++
Raw Blame History

/////////////////////////////////////////////////////////////////////////////
// Name: dc.cpp
// Purpose: wxDC class
// Author: Julian Smart
// Modified by:
// Created: 01/02/97
// RCS-ID: $Id$
// Copyright: (c) Julian Smart and Markus Holzem
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
// ===========================================================================
// declarations
// ===========================================================================
// ---------------------------------------------------------------------------
// headers
// ---------------------------------------------------------------------------
#ifdef __GNUG__
#pragma implementation "dc.h"
#endif
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#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/dcprint.h"
#include <string.h>
#include <math.h>
#include "wx/msw/private.h" // needs to be before #include <commdlg.h>
#if wxUSE_COMMON_DIALOGS
#if wxUSE_NORLANDER_HEADERS
#include <windows.h>
#endif
#include <commdlg.h>
#endif
#ifndef __WIN32__
#include <print.h>
#endif
IMPLEMENT_ABSTRACT_CLASS(wxDC, wxObject)
// ---------------------------------------------------------------------------
// constants
// ---------------------------------------------------------------------------
static const int VIEWPORT_EXTENT = 1000;
static const int MM_POINTS = 9;
static const int MM_METRIC = 10;
// usually this is defined in math.h
#ifndef M_PI
static const double M_PI = 3.14159265358979323846;
#endif // M_PI
// ROPs which don't have standard names (see "Ternary Raster Operations" in the
// MSDN docs for how this and other numbers in wxDC::Blit() are obtained)
#define DSTCOPY 0x00AA0029 // a.k.a. NOP operation
// ---------------------------------------------------------------------------
// private functions
// ---------------------------------------------------------------------------
// convert degrees to radians
static inline double DegToRad(double deg) { return (deg * M_PI) / 180.0; }
// ===========================================================================
// implementation
// ===========================================================================
// ---------------------------------------------------------------------------
// wxDC
// ---------------------------------------------------------------------------
// Default constructor
wxDC::wxDC()
{
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_windowExtX = VIEWPORT_EXTENT;
m_windowExtY = VIEWPORT_EXTENT;
m_hDCCount = 0;
}
wxDC::~wxDC()
{
if ( m_hDC != 0 ) {
SelectOldObjects(m_hDC);
if ( m_bOwnsDC ) {
if ( m_canvas == NULL )
::DeleteDC(GetHdc());
else
::ReleaseDC((HWND)m_canvas->GetHWND(), GetHdc());
}
}
}
// 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::DoSetClippingRegion(wxCoord cx, wxCoord cy, wxCoord cw, wxCoord ch)
{
m_clipping = TRUE;
m_clipX1 = (int)cx;
m_clipY1 = (int)cy;
m_clipX2 = (int)(cx + cw);
m_clipY2 = (int)(cy + ch);
DoClipping((WXHDC) m_hDC);
}
void wxDC::DoSetClippingRegionAsRegion(const wxRegion& region)
{
wxCHECK_RET( region.GetHRGN(), wxT("invalid clipping region") );
wxRect box = region.GetBox();
m_clipping = TRUE;
m_clipX1 = box.x;
m_clipY1 = box.y;
m_clipX2 = box.x + box.width;
m_clipY2 = box.y + box.height;
#ifdef __WIN16__
SelectClipRgn(GetHdc(), (HRGN) region.GetHRGN());
#else
ExtSelectClipRgn(GetHdc(), (HRGN) region.GetHRGN(), RGN_AND);
#endif
}
void wxDC::DoClipping(WXHDC dc)
{
if (m_clipping && dc)
{
IntersectClipRect((HDC) dc, XLOG2DEV(m_clipX1), YLOG2DEV(m_clipY1),
XLOG2DEV(m_clipX2), YLOG2DEV(m_clipY2));
}
}
void wxDC::DestroyClippingRegion()
{
if (m_clipping && m_hDC)
{
// TODO: this should restore the previous clipping region,
// so that OnPaint processing works correctly, and the update clipping region
// doesn't get destroyed after the first DestroyClippingRegion.
HRGN rgn = CreateRectRgn(0, 0, 32000, 32000);
SelectClipRgn(GetHdc(), rgn);
DeleteObject(rgn);
}
m_clipping = FALSE;
}
// ---------------------------------------------------------------------------
// query capabilities
// ---------------------------------------------------------------------------
bool wxDC::CanDrawBitmap() const
{
return TRUE;
}
bool wxDC::CanGetTextExtent() const
{
// What sort of display is it?
int technology = ::GetDeviceCaps(GetHdc(), TECHNOLOGY);
return (technology == DT_RASDISPLAY) || (technology == DT_RASPRINTER);
}
int wxDC::GetDepth() const
{
return (int)::GetDeviceCaps(GetHdc(), BITSPIXEL);
}
// ---------------------------------------------------------------------------
// drawing
// ---------------------------------------------------------------------------
void wxDC::Clear()
{
RECT rect;
if ( m_canvas )
{
GetClientRect((HWND) m_canvas->GetHWND(), &rect);
}
else
{
// No, I think we should simply ignore this if printing on e.g.
// a printer DC.
// wxCHECK_RET( m_selectedBitmap.Ok(), wxT("this DC can't be cleared") );
if (!m_selectedBitmap.Ok())
return;
rect.left = 0; rect.top = 0;
rect.right = m_selectedBitmap.GetWidth();
rect.bottom = m_selectedBitmap.GetHeight();
}
(void) ::SetMapMode(GetHdc(), MM_TEXT);
DWORD colour = GetBkColor(GetHdc());
HBRUSH brush = CreateSolidBrush(colour);
FillRect(GetHdc(), &rect, brush);
DeleteObject(brush);
::SetMapMode(GetHdc(), MM_ANISOTROPIC);
::SetViewportExtEx(GetHdc(), VIEWPORT_EXTENT, VIEWPORT_EXTENT, NULL);
::SetWindowExtEx(GetHdc(), m_windowExtX, m_windowExtY, NULL);
::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL);
::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL);
}
void wxDC::DoFloodFill(wxCoord x, wxCoord y, const wxColour& col, int style)
{
if ( !::ExtFloodFill(GetHdc(), XLOG2DEV(x), YLOG2DEV(y),
col.GetPixel(),
style == wxFLOOD_SURFACE ? FLOODFILLSURFACE
: FLOODFILLBORDER) )
{
// quoting from the MSDN docs:
//
// Following are some of the reasons this function might fail:
//
// * The filling could not be completed.
// * The specified point has the boundary color specified by the
// crColor parameter (if FLOODFILLBORDER was requested).
// * The specified point does not have the color specified by
// crColor (if FLOODFILLSURFACE was requested)
// * The point is outside the clipping region that is, it is not
// visible on the device.
//
wxLogLastError("ExtFloodFill");
}
CalcBoundingBox(x, y);
}
bool wxDC::DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const
{
// get the color of the pixel
COLORREF pixelcolor = ::GetPixel(GetHdc(), XLOG2DEV(x), YLOG2DEV(y));
// get the color of the pen
COLORREF pencolor = 0x00ffffff;
if (m_pen.Ok())
{
pencolor = m_pen.GetColour().GetPixel();
}
// return the color of the pixel
if( col )
{
col->Set(GetRValue(pixelcolor),
GetGValue(pixelcolor),
GetBValue(pixelcolor));
}
// check, if color of the pixels is the same as the color of the current
// pen and return TRUE if it is, FALSE otherwise
return pixelcolor == pencolor;
}
void wxDC::DoCrossHair(wxCoord x, wxCoord y)
{
wxCoord x1 = x-VIEWPORT_EXTENT;
wxCoord y1 = y-VIEWPORT_EXTENT;
wxCoord x2 = x+VIEWPORT_EXTENT;
wxCoord y2 = y+VIEWPORT_EXTENT;
(void)MoveToEx(GetHdc(), XLOG2DEV(x1), YLOG2DEV(y), NULL);
(void)LineTo(GetHdc(), XLOG2DEV(x2), YLOG2DEV(y));
(void)MoveToEx(GetHdc(), XLOG2DEV(x), YLOG2DEV(y1), NULL);
(void)LineTo(GetHdc(), XLOG2DEV(x), YLOG2DEV(y2));
CalcBoundingBox(x1, y1);
CalcBoundingBox(x2, y2);
}
void wxDC::DoDrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2)
{
(void)MoveToEx(GetHdc(), XLOG2DEV(x1), YLOG2DEV(y1), NULL);
(void)LineTo(GetHdc(), XLOG2DEV(x2), YLOG2DEV(y2));
/* MATTHEW: [6] New normalization */
#if WX_STANDARD_GRAPHICS
(void)LineTo(GetHdc(), XLOG2DEV(x2) + 1, YLOG2DEV(y2));
#endif
CalcBoundingBox(x1, y1);
CalcBoundingBox(x2, y2);
}
void wxDC::DoDrawArc(wxCoord x1,wxCoord y1,wxCoord x2,wxCoord y2, wxCoord xc, wxCoord yc)
{
double dx = xc-x1;
double dy = yc-y1;
double radius = (double)sqrt(dx*dx+dy*dy) ;;
if (x1==x2 && x2==y2)
{
DrawEllipse(xc,yc,(wxCoord)(radius*2.0),(wxCoord)(radius*2.0));
return;
}
wxCoord xx1 = XLOG2DEV(x1);
wxCoord yy1 = YLOG2DEV(y1);
wxCoord xx2 = XLOG2DEV(x2);
wxCoord yy2 = YLOG2DEV(y2);
wxCoord xxc = XLOG2DEV(xc);
wxCoord yyc = YLOG2DEV(yc);
wxCoord ray = (wxCoord) sqrt(double((xxc-xx1)*(xxc-xx1)+(yyc-yy1)*(yyc-yy1)));
(void)MoveToEx(GetHdc(), (int) xx1, (int) yy1, NULL);
wxCoord xxx1 = (wxCoord) (xxc-ray);
wxCoord yyy1 = (wxCoord) (yyc-ray);
wxCoord xxx2 = (wxCoord) (xxc+ray);
wxCoord yyy2 = (wxCoord) (yyc+ray);
if (m_brush.Ok() && m_brush.GetStyle() !=wxTRANSPARENT)
{
// Have to add 1 to bottom-right corner of rectangle
// to make semi-circles look right (crooked line otherwise).
// Unfortunately this is not a reliable method, depends
// on the size of shape.
// TODO: figure out why this happens!
Pie(GetHdc(),xxx1,yyy1,xxx2+1,yyy2+1,
xx1,yy1,xx2,yy2);
}
else
Arc(GetHdc(),xxx1,yyy1,xxx2,yyy2,
xx1,yy1,xx2,yy2);
CalcBoundingBox((wxCoord)(xc-radius), (wxCoord)(yc-radius));
CalcBoundingBox((wxCoord)(xc+radius), (wxCoord)(yc+radius));
}
void wxDC::DoDrawPoint(wxCoord x, wxCoord y)
{
COLORREF color = 0x00ffffff;
if (m_pen.Ok())
{
color = m_pen.GetColour().GetPixel();
}
SetPixel(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), color);
CalcBoundingBox(x, y);
}
void wxDC::DoDrawPolygon(int n, wxPoint points[], wxCoord xoffset, wxCoord yoffset,int fillStyle)
{
COLORREF old_textground = ::GetTextColor(GetHdc());
COLORREF old_background = ::GetBkColor(GetHdc());
if (m_brush.GetStyle() == wxSTIPPLE_MASK_OPAQUE)
{
if (m_textForegroundColour.Ok())
{ //just the oposite from what is expected see help on pattern brush
// 1 in mask becomes bk color
::SetBkColor(GetHdc(), m_textForegroundColour.GetPixel() );
}
if (m_textBackgroundColour.Ok())
{ //just the oposite from what is expected
// 0 in mask becomes text color
::SetTextColor(GetHdc(), m_textBackgroundColour.GetPixel() );
}
if (m_backgroundMode == wxTRANSPARENT)
SetBkMode(GetHdc(), TRANSPARENT);
else
SetBkMode(GetHdc(), OPAQUE);
}
// Do things less efficiently if we have offsets
if (xoffset != 0 || yoffset != 0)
{
POINT *cpoints = new POINT[n];
int i;
for (i = 0; i < n; i++)
{
cpoints[i].x = (int)(points[i].x + xoffset);
cpoints[i].y = (int)(points[i].y + yoffset);
CalcBoundingBox(cpoints[i].x, cpoints[i].y);
}
int prev = SetPolyFillMode(GetHdc(),fillStyle==wxODDEVEN_RULE?ALTERNATE:WINDING);
(void)Polygon(GetHdc(), cpoints, n);
SetPolyFillMode(GetHdc(),prev);
delete[] cpoints;
}
else
{
int i;
for (i = 0; i < n; i++)
CalcBoundingBox(points[i].x, points[i].y);
int prev = SetPolyFillMode(GetHdc(),fillStyle==wxODDEVEN_RULE?ALTERNATE:WINDING);
(void)Polygon(GetHdc(), (POINT*) points, n);
SetPolyFillMode(GetHdc(),prev);
}
if (m_brush.GetStyle() == wxSTIPPLE_MASK_OPAQUE)
{
::SetBkMode(GetHdc(), TRANSPARENT);
::SetTextColor(GetHdc(), old_textground);
::SetBkColor(GetHdc(), old_background);
}
}
void wxDC::DoDrawLines(int n, wxPoint points[], wxCoord xoffset, wxCoord yoffset)
{
// Do things less efficiently if we have offsets
if (xoffset != 0 || yoffset != 0)
{
POINT *cpoints = new POINT[n];
int i;
for (i = 0; i < n; i++)
{
cpoints[i].x = (int)(points[i].x + xoffset);
cpoints[i].y = (int)(points[i].y + yoffset);
CalcBoundingBox(cpoints[i].x, cpoints[i].y);
}
(void)Polyline(GetHdc(), cpoints, n);
delete[] cpoints;
}
else
{
int i;
for (i = 0; i < n; i++)
CalcBoundingBox(points[i].x, points[i].y);
(void)Polyline(GetHdc(), (POINT*) points, n);
}
}
void wxDC::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
{
COLORREF colFgOld = 0,
colBgOld = 0;
if ( m_brush.GetStyle() == wxSTIPPLE_MASK_OPAQUE )
{
colFgOld = ::GetTextColor(GetHdc());
colBgOld = ::GetBkColor(GetHdc());
if ( m_textForegroundColour.Ok() )
{
// just the oposite from what is expected see help on pattern brush
// 1 in mask becomes bk color
::SetBkColor(GetHdc(), m_textForegroundColour.GetPixel());
}
if ( m_textBackgroundColour.Ok() )
{
// 0 in mask becomes text color
::SetTextColor(GetHdc(), m_textBackgroundColour.GetPixel());
}
// VZ: IMHO this does strictly nothing here
SetBkMode(GetHdc(), m_backgroundMode == wxTRANSPARENT ? TRANSPARENT
: OPAQUE);
}
wxCoord x2 = x + width;
wxCoord y2 = y + height;
// Windows draws the filled rectangles without outline (i.e. drawn with a
// transparent pen) one pixel smaller in both directions and we want them
// to have the same size regardless of which pen is used - adjust
if ( m_pen.GetStyle() == wxTRANSPARENT )
{
// x2++;
// y2++;
}
(void)Rectangle(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2), YLOG2DEV(y2));
CalcBoundingBox(x, y);
CalcBoundingBox(x2, y2);
if ( m_brush.GetStyle() == wxSTIPPLE_MASK_OPAQUE )
{
// restore the colours we changed
::SetBkMode(GetHdc(), TRANSPARENT);
::SetTextColor(GetHdc(), colFgOld);
::SetBkColor(GetHdc(), colBgOld);
}
}
void wxDC::DoDrawRoundedRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height, double radius)
{
// Now, a negative radius value is interpreted to mean
// 'the proportion of the smallest X or Y dimension'
if (radius < 0.0)
{
double smallest = 0.0;
if (width < height)
smallest = width;
else
smallest = height;
radius = (- radius * smallest);
}
wxCoord x2 = (x+width);
wxCoord y2 = (y+height);
(void)RoundRect(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2),
YLOG2DEV(y2), (int) (2*XLOG2DEV(radius)), (int)( 2*YLOG2DEV(radius)));
CalcBoundingBox(x, y);
CalcBoundingBox(x2, y2);
}
void wxDC::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
{
wxCoord x2 = (x+width);
wxCoord y2 = (y+height);
(void)Ellipse(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2), YLOG2DEV(y2));
CalcBoundingBox(x, y);
CalcBoundingBox(x2, y2);
}
// Chris Breeze 20/5/98: first implementation of DrawEllipticArc on Windows
void wxDC::DoDrawEllipticArc(wxCoord x,wxCoord y,wxCoord w,wxCoord h,double sa,double ea)
{
wxCoord x2 = (x+w);
wxCoord y2 = (y+h);
int rx1 = XLOG2DEV(x+w/2);
int ry1 = YLOG2DEV(y+h/2);
int rx2 = rx1;
int ry2 = ry1;
sa = DegToRad(sa);
ea = DegToRad(ea);
rx1 += (int)(100.0 * abs(w) * cos(sa));
ry1 -= (int)(100.0 * abs(h) * m_signY * sin(sa));
rx2 += (int)(100.0 * abs(w) * cos(ea));
ry2 -= (int)(100.0 * abs(h) * m_signY * sin(ea));
// draw pie with NULL_PEN first and then outline otherwise a line is
// drawn from the start and end points to the centre
HPEN orig_pen = (HPEN) ::SelectObject(GetHdc(), (HPEN) ::GetStockObject(NULL_PEN));
if (m_signY > 0)
{
(void)Pie(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2)+1, YLOG2DEV(y2)+1,
rx1, ry1, rx2, ry2);
}
else
{
(void)Pie(GetHdc(), XLOG2DEV(x), YLOG2DEV(y)-1, XLOG2DEV(x2)+1, YLOG2DEV(y2),
rx1, ry1-1, rx2, ry2-1);
}
::SelectObject(GetHdc(), orig_pen);
(void)Arc(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2), YLOG2DEV(y2),
rx1, ry1, rx2, ry2);
CalcBoundingBox(x, y);
CalcBoundingBox(x2, y2);
}
void wxDC::DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y)
{
wxCHECK_RET( icon.Ok(), wxT("invalid icon in DrawIcon") );
::DrawIcon(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), GetHiconOf(icon));
CalcBoundingBox(x, y);
CalcBoundingBox(x + icon.GetWidth(), y + icon.GetHeight());
}
void wxDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool useMask )
{
wxCHECK_RET( bmp.Ok(), _T("invalid bitmap in wxDC::DrawBitmap") );
int width = bmp.GetWidth(),
height = bmp.GetHeight();
HBITMAP hbmpMask = 0;
if ( useMask )
{
wxMask *mask = bmp.GetMask();
if ( mask )
hbmpMask = (HBITMAP)mask->GetMaskBitmap();
if ( !hbmpMask )
{
// don't give assert here because this would break existing
// programs - just silently ignore useMask parameter
useMask = FALSE;
}
}
if ( useMask )
{
#ifdef __WIN32__
HDC hdcMem = ::CreateCompatibleDC(GetHdc());
::SelectObject(hdcMem, GetHbitmapOf(bmp));
// use MaskBlt() with ROP which doesn't do anything to dst in the mask
// points
bool ok = ::MaskBlt(GetHdc(), x, y, width, height,
hdcMem, 0, 0,
hbmpMask, 0, 0,
MAKEROP4(SRCCOPY, DSTCOPY)) != 0;
::DeleteDC(hdcMem);
if ( !ok )
#endif // Win32
{
// Rather than reproduce wxDC::Blit, let's do it at the wxWin API
// level
wxMemoryDC memDC;
memDC.SelectObject(bmp);
Blit(x, y, width, height, &memDC, 0, 0, wxCOPY, useMask);
memDC.SelectObject(wxNullBitmap);
}
}
else // no mask, just use BitBlt()
{
HDC cdc = GetHdc();
HDC memdc = ::CreateCompatibleDC( cdc );
HBITMAP hbitmap = (HBITMAP) bmp.GetHBITMAP( );
wxASSERT_MSG( hbitmap, wxT("bitmap is ok but HBITMAP is NULL?") );
COLORREF old_textground = ::GetTextColor(GetHdc());
COLORREF old_background = ::GetBkColor(GetHdc());
if (m_textForegroundColour.Ok())
{
::SetTextColor(GetHdc(), m_textForegroundColour.GetPixel() );
}
if (m_textBackgroundColour.Ok())
{
::SetBkColor(GetHdc(), m_textBackgroundColour.GetPixel() );
}
::SelectObject( memdc, hbitmap );
::BitBlt( cdc, x, y, width, height, memdc, 0, 0, SRCCOPY);
::DeleteDC( memdc );
::SetTextColor(GetHdc(), old_textground);
::SetBkColor(GetHdc(), old_background);
}
}
void wxDC::DoDrawText(const wxString& text, wxCoord x, wxCoord y)
{
DrawAnyText(text, x, y);
// update the bounding box
CalcBoundingBox(x, y);
wxCoord w, h;
GetTextExtent(text, &w, &h);
CalcBoundingBox(x + w, y + h);
}
void wxDC::DrawAnyText(const wxString& text, wxCoord x, wxCoord y)
{
// prepare for drawing the text
if ( m_textForegroundColour.Ok() )
SetTextColor(GetHdc(), m_textForegroundColour.GetPixel());
DWORD old_background = 0;
if ( m_textBackgroundColour.Ok() )
{
old_background = SetBkColor(GetHdc(), m_textBackgroundColour.GetPixel() );
}
SetBkMode(GetHdc(), m_backgroundMode == wxTRANSPARENT ? TRANSPARENT
: OPAQUE);
if ( ::TextOut(GetHdc(), XLOG2DEV(x), YLOG2DEV(y),
text.c_str(), text.length()) == 0 )
{
wxLogLastError("TextOut");
}
// restore the old parameters (text foreground colour may be left because
// it never is set to anything else, but background should remain
// transparent even if we just drew an opaque string)
if ( m_textBackgroundColour.Ok() )
(void)SetBkColor(GetHdc(), old_background);
SetBkMode(GetHdc(), TRANSPARENT);
}
void wxDC::DoDrawRotatedText(const wxString& text,
wxCoord x, wxCoord y,
double angle)
{
// we test that we have some font because otherwise we should still use the
// "else" part below to avoid that DrawRotatedText(angle = 180) and
// DrawRotatedText(angle = 0) use different fonts (we can't use the default
// font for drawing rotated fonts unfortunately)
if ( (angle == 0.0) && m_font.Ok() )
{
DoDrawText(text, x, y);
}
else
{
// NB: don't take DEFAULT_GUI_FONT because it's not TrueType and so
// can't have non zero orientation/escapement
wxFont font = m_font.Ok() ? m_font : *wxNORMAL_FONT;
HFONT hfont = (HFONT)font.GetResourceHandle();
LOGFONT lf;
if ( ::GetObject(hfont, sizeof(lf), &lf) == 0 )
{
wxLogLastError("GetObject(hfont)");
}
// GDI wants the angle in tenth of degree
long angle10 = (long)(angle * 10);
lf.lfEscapement = angle10;
lf. lfOrientation = angle10;
hfont = ::CreateFontIndirect(&lf);
if ( !hfont )
{
wxLogLastError("CreateFont");
}
else
{
HFONT hfontOld = (HFONT)::SelectObject(GetHdc(), hfont);
DrawAnyText(text, x, y);
(void)::SelectObject(GetHdc(), hfontOld);
(void)::DeleteObject(hfont);
}
// call the bounding box by adding all four vertices of the rectangle
// containing the text to it (simpler and probably not slower than
// determining which of them is really topmost/leftmost/...)
wxCoord w, h;
GetTextExtent(text, &w, &h);
double rad = DegToRad(angle);
// "upper left" and "upper right"
CalcBoundingBox(x, y);
CalcBoundingBox(x + w*cos(rad), y - h*sin(rad));
// "bottom left" and "bottom right"
x += (wxCoord)(h*sin(rad));
y += (wxCoord)(h*cos(rad));
CalcBoundingBox(x, y);
CalcBoundingBox(x + h*sin(rad), y + h*cos(rad));
}
}
// ---------------------------------------------------------------------------
// set GDI objects
// ---------------------------------------------------------------------------
void wxDC::SetPalette(const wxPalette& palette)
{
// Set the old object temporarily, in case the assignment deletes an object
// that's not yet selected out.
if (m_oldPalette)
{
::SelectPalette(GetHdc(), (HPALETTE) m_oldPalette, TRUE);
m_oldPalette = 0;
}
m_palette = palette;
if (!m_palette.Ok())
{
// Setting a NULL colourmap is a way of restoring
// the original colourmap
if (m_oldPalette)
{
::SelectPalette(GetHdc(), (HPALETTE) m_oldPalette, TRUE);
m_oldPalette = 0;
}
return;
}
if (m_palette.Ok() && m_palette.GetHPALETTE())
{
HPALETTE oldPal = ::SelectPalette(GetHdc(), (HPALETTE) m_palette.GetHPALETTE(), TRUE);
if (!m_oldPalette)
m_oldPalette = (WXHPALETTE) oldPal;
::RealizePalette(GetHdc());
}
}
void wxDC::SetFont(const wxFont& the_font)
{
// Set the old object temporarily, in case the assignment deletes an object
// that's not yet selected out.
if (m_oldFont)
{
::SelectObject(GetHdc(), (HFONT) m_oldFont);
m_oldFont = 0;
}
m_font = the_font;
if (!the_font.Ok())
{
if (m_oldFont)
::SelectObject(GetHdc(), (HFONT) m_oldFont);
m_oldFont = 0;
}
if (m_font.Ok() && m_font.GetResourceHandle())
{
HFONT f = (HFONT) ::SelectObject(GetHdc(), (HFONT) m_font.GetResourceHandle());
if (f == (HFONT) NULL)
{
wxLogDebug(wxT("::SelectObject failed in wxDC::SetFont."));
}
if (!m_oldFont)
m_oldFont = (WXHFONT) f;
}
}
void wxDC::SetPen(const wxPen& pen)
{
// Set the old object temporarily, in case the assignment deletes an object
// that's not yet selected out.
if (m_oldPen)
{
::SelectObject(GetHdc(), (HPEN) m_oldPen);
m_oldPen = 0;
}
m_pen = pen;
if (!m_pen.Ok())
{
if (m_oldPen)
::SelectObject(GetHdc(), (HPEN) m_oldPen);
m_oldPen = 0;
}
if (m_pen.Ok())
{
if (m_pen.GetResourceHandle())
{
HPEN p = (HPEN) ::SelectObject(GetHdc(), (HPEN)m_pen.GetResourceHandle());
if (!m_oldPen)
m_oldPen = (WXHPEN) p;
}
}
}
void wxDC::SetBrush(const wxBrush& brush)
{
// Set the old object temporarily, in case the assignment deletes an object
// that's not yet selected out.
if (m_oldBrush)
{
::SelectObject(GetHdc(), (HBRUSH) m_oldBrush);
m_oldBrush = 0;
}
m_brush = brush;
if (!m_brush.Ok())
{
if (m_oldBrush)
::SelectObject(GetHdc(), (HBRUSH) m_oldBrush);
m_oldBrush = 0;
}
if (m_brush.Ok())
{
if (m_brush.GetResourceHandle())
{
HBRUSH b = 0;
b = (HBRUSH) ::SelectObject(GetHdc(), (HBRUSH)m_brush.GetResourceHandle());
if (!m_oldBrush)
m_oldBrush = (WXHBRUSH) b;
}
}
}
void wxDC::SetBackground(const wxBrush& brush)
{
m_backgroundBrush = brush;
if (!m_backgroundBrush.Ok())
return;
if (m_canvas)
{
bool customColours = TRUE;
// If we haven't specified wxUSER_COLOURS, don't allow the panel/dialog box to
// change background colours from the control-panel specified colours.
if (m_canvas->IsKindOf(CLASSINFO(wxWindow)) && ((m_canvas->GetWindowStyleFlag() & wxUSER_COLOURS) != wxUSER_COLOURS))
customColours = FALSE;
if (customColours)
{
if (m_backgroundBrush.GetStyle()==wxTRANSPARENT)
{
m_canvas->SetTransparent(TRUE);
}
else
{
// New behaviour, 10/2/99: setting the background brush of a DC
// doesn't affect the window background colour. However,
// I'm leaving in the transparency setting because it's needed by
// various controls (e.g. wxStaticText) to determine whether to draw
// transparently or not. TODO: maybe this should be a new function
// wxWindow::SetTransparency(). Should that apply to the child itself, or the
// parent?
// m_canvas->SetBackgroundColour(m_backgroundBrush.GetColour());
m_canvas->SetTransparent(FALSE);
}
}
}
COLORREF new_color = m_backgroundBrush.GetColour().GetPixel();
{
(void)SetBkColor(GetHdc(), new_color);
}
}
void wxDC::SetBackgroundMode(int mode)
{
m_backgroundMode = mode;
// SetBackgroundColour now only refers to text background
// and m_backgroundMode is used there
/*
if (m_backgroundMode == wxTRANSPARENT)
::SetBkMode(GetHdc(), TRANSPARENT);
else
::SetBkMode(GetHdc(), OPAQUE);
*/
}
void wxDC::SetLogicalFunction(int function)
{
m_logicalFunction = function;
SetRop(m_hDC);
}
void wxDC::SetRop(WXHDC dc)
{
if ( !dc || m_logicalFunction < 0 )
return;
int rop;
switch (m_logicalFunction)
{
case wxCLEAR: rop = R2_BLACK; break;
case wxXOR: rop = R2_XORPEN; break;
case wxINVERT: rop = R2_NOT; break;
case wxOR_REVERSE: rop = R2_MERGEPENNOT; break;
case wxAND_REVERSE: rop = R2_MASKPENNOT; break;
case wxCOPY: rop = R2_COPYPEN; break;
case wxAND: rop = R2_MASKPEN; break;
case wxAND_INVERT: rop = R2_MASKNOTPEN; break;
case wxNO_OP: rop = R2_NOP; break;
case wxNOR: rop = R2_NOTMERGEPEN; break;
case wxEQUIV: rop = R2_NOTXORPEN; break;
case wxSRC_INVERT: rop = R2_NOTCOPYPEN; break;
case wxOR_INVERT: rop = R2_MERGENOTPEN; break;
case wxNAND: rop = R2_NOTMASKPEN; break;
case wxOR: rop = R2_MERGEPEN; break;
case wxSET: rop = R2_WHITE; break;
default:
wxFAIL_MSG( wxT("unsupported logical function") );
return;
}
SetROP2(GetHdc(), rop);
}
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()
{
}
// ---------------------------------------------------------------------------
// text metrics
// ---------------------------------------------------------------------------
wxCoord wxDC::GetCharHeight() const
{
TEXTMETRIC lpTextMetric;
GetTextMetrics(GetHdc(), &lpTextMetric);
return YDEV2LOGREL(lpTextMetric.tmHeight);
}
wxCoord wxDC::GetCharWidth() const
{
TEXTMETRIC lpTextMetric;
GetTextMetrics(GetHdc(), &lpTextMetric);
return XDEV2LOGREL(lpTextMetric.tmAveCharWidth);
}
void wxDC::DoGetTextExtent(const wxString& string, wxCoord *x, wxCoord *y,
wxCoord *descent, wxCoord *externalLeading,
wxFont *theFont) const
{
wxFont *fontToUse = (wxFont*) theFont;
if (!fontToUse)
fontToUse = (wxFont*) &m_font;
SIZE sizeRect;
TEXTMETRIC tm;
GetTextExtentPoint(GetHdc(), WXSTRINGCAST string, wxStrlen(WXSTRINGCAST string), &sizeRect);
GetTextMetrics(GetHdc(), &tm);
if (x) *x = XDEV2LOGREL(sizeRect.cx);
if (y) *y = YDEV2LOGREL(sizeRect.cy);
if (descent) *descent = tm.tmDescent;
if (externalLeading) *externalLeading = tm.tmExternalLeading;
}
void wxDC::SetMapMode(int mode)
{
m_mappingMode = mode;
int pixel_width = 0;
int pixel_height = 0;
int mm_width = 0;
int mm_height = 0;
pixel_width = GetDeviceCaps(GetHdc(), HORZRES);
pixel_height = GetDeviceCaps(GetHdc(), VERTRES);
mm_width = GetDeviceCaps(GetHdc(), HORZSIZE);
mm_height = GetDeviceCaps(GetHdc(), VERTSIZE);
if ((pixel_width == 0) || (pixel_height == 0) || (mm_width == 0) || (mm_height == 0))
{
return;
}
double mm2pixelsX = pixel_width/mm_width;
double mm2pixelsY = pixel_height/mm_height;
switch (mode)
{
case wxMM_TWIPS:
{
m_logicalScaleX = (twips2mm * mm2pixelsX);
m_logicalScaleY = (twips2mm * mm2pixelsY);
break;
}
case wxMM_POINTS:
{
m_logicalScaleX = (pt2mm * mm2pixelsX);
m_logicalScaleY = (pt2mm * mm2pixelsY);
break;
}
case wxMM_METRIC:
{
m_logicalScaleX = mm2pixelsX;
m_logicalScaleY = mm2pixelsY;
break;
}
case wxMM_LOMETRIC:
{
m_logicalScaleX = (mm2pixelsX/10.0);
m_logicalScaleY = (mm2pixelsY/10.0);
break;
}
default:
case wxMM_TEXT:
{
m_logicalScaleX = 1.0;
m_logicalScaleY = 1.0;
break;
}
}
if (::GetMapMode(GetHdc()) != MM_ANISOTROPIC)
::SetMapMode(GetHdc(), MM_ANISOTROPIC);
SetViewportExtEx(GetHdc(), VIEWPORT_EXTENT, VIEWPORT_EXTENT, NULL);
m_windowExtX = (int)MS_XDEV2LOGREL(VIEWPORT_EXTENT);
m_windowExtY = (int)MS_YDEV2LOGREL(VIEWPORT_EXTENT);
::SetWindowExtEx(GetHdc(), m_windowExtX, m_windowExtY, NULL);
::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL);
::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL);
}
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)
{
m_logicalOriginX = x;
m_logicalOriginY = y;
::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL);
}
void wxDC::SetDeviceOrigin(wxCoord x, wxCoord y)
{
m_deviceOriginX = x;
m_deviceOriginY = y;
::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL);
}
// ---------------------------------------------------------------------------
// coordinates transformations
// ---------------------------------------------------------------------------
wxCoord wxDCBase::DeviceToLogicalX(wxCoord x) const
{
return (wxCoord) (((x) - m_deviceOriginX)/(m_logicalScaleX*m_userScaleX*m_signX*m_scaleX) - m_logicalOriginX);
}
wxCoord wxDCBase::DeviceToLogicalXRel(wxCoord x) const
{
return (wxCoord) ((x)/(m_logicalScaleX*m_userScaleX*m_signX*m_scaleX));
}
wxCoord wxDCBase::DeviceToLogicalY(wxCoord y) const
{
return (wxCoord) (((y) - m_deviceOriginY)/(m_logicalScaleY*m_userScaleY*m_signY*m_scaleY) - m_logicalOriginY);
}
wxCoord wxDCBase::DeviceToLogicalYRel(wxCoord y) const
{
return (wxCoord) ((y)/(m_logicalScaleY*m_userScaleY*m_signY*m_scaleY));
}
wxCoord wxDCBase::LogicalToDeviceX(wxCoord x) const
{
return (wxCoord) ((x - m_logicalOriginX)*m_logicalScaleX*m_userScaleX*m_signX*m_scaleX + m_deviceOriginX);
}
wxCoord wxDCBase::LogicalToDeviceXRel(wxCoord x) const
{
return (wxCoord) (x*m_logicalScaleX*m_userScaleX*m_signX*m_scaleX);
}
wxCoord wxDCBase::LogicalToDeviceY(wxCoord y) const
{
return (wxCoord) ((y - m_logicalOriginY)*m_logicalScaleY*m_userScaleY*m_signY*m_scaleY + m_deviceOriginY);
}
wxCoord wxDCBase::LogicalToDeviceYRel(wxCoord y) const
{
return (wxCoord) (y*m_logicalScaleY*m_userScaleY*m_signY*m_scaleY);
}
// ---------------------------------------------------------------------------
// bit blit
// ---------------------------------------------------------------------------
bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest,
wxCoord width, wxCoord height,
wxDC *source, wxCoord xsrc, wxCoord ysrc,
int rop, bool useMask)
{
wxMask *mask = NULL;
if ( useMask )
{
const wxBitmap& bmp = source->m_selectedBitmap;
mask = bmp.GetMask();
if ( !(bmp.Ok() && mask && mask->GetMaskBitmap()) )
{
// don't give assert here because this would break existing
// programs - just silently ignore useMask parameter
useMask = FALSE;
}
}
COLORREF old_textground = ::GetTextColor(GetHdc());
COLORREF old_background = ::GetBkColor(GetHdc());
if (m_textForegroundColour.Ok())
{
::SetTextColor(GetHdc(), m_textForegroundColour.GetPixel() );
}
if (m_textBackgroundColour.Ok())
{
::SetBkColor(GetHdc(), m_textBackgroundColour.GetPixel() );
}
DWORD dwRop = SRCCOPY;
switch (rop)
{
case wxXOR: dwRop = SRCINVERT; break;
case wxINVERT: dwRop = DSTINVERT; break;
case wxOR_REVERSE: dwRop = 0x00DD0228; break;
case wxAND_REVERSE: dwRop = SRCERASE; break;
case wxCLEAR: dwRop = BLACKNESS; break;
case wxSET: dwRop = WHITENESS; break;
case wxOR_INVERT: dwRop = MERGEPAINT; break;
case wxAND: dwRop = SRCAND; break;
case wxOR: dwRop = SRCPAINT; break;
case wxEQUIV: dwRop = 0x00990066; break;
case wxNAND: dwRop = 0x007700E6; break;
case wxAND_INVERT: dwRop = 0x00220326; break;
case wxCOPY: dwRop = SRCCOPY; break;
case wxNO_OP: dwRop = DSTCOPY; break;
case wxSRC_INVERT: dwRop = NOTSRCCOPY; break;
case wxNOR: dwRop = NOTSRCCOPY; break;
default:
wxFAIL_MSG( wxT("unsupported logical function") );
return FALSE;
}
bool success;
if (useMask)
{
#ifdef __WIN32__
// we want the part of the image corresponding to the mask to be
// transparent, so use "DSTCOPY" ROP for the mask points (the usual
// meaning of fg and bg is inverted which corresponds to wxWin notion
// of the mask which is also contrary to the Windows one)
success = ::MaskBlt(GetHdc(), xdest, ydest, width, height,
GetHdcOf(*source), xsrc, ysrc,
(HBITMAP)mask->GetMaskBitmap(), 0, 0,
MAKEROP4(dwRop, DSTCOPY)) != 0;
if ( !success )
#endif // Win32
{
// Blit bitmap with mask
// create a temp buffer bitmap and DCs to access it and the mask
HDC dc_mask = ::CreateCompatibleDC(GetHdcOf(*source));
HDC dc_buffer = ::CreateCompatibleDC(GetHdc());
HBITMAP buffer_bmap = ::CreateCompatibleBitmap(GetHdc(), width, height);
::SelectObject(dc_mask, (HBITMAP) mask->GetMaskBitmap());
::SelectObject(dc_buffer, buffer_bmap);
// copy dest to buffer
if ( !::BitBlt(dc_buffer, 0, 0, (int)width, (int)height,
GetHdc(), xdest, ydest, SRCCOPY) )
{
wxLogLastError("BitBlt");
}
// copy src to buffer using selected raster op
if ( !::BitBlt(dc_buffer, 0, 0, (int)width, (int)height,
GetHdcOf(*source), xsrc, ysrc, dwRop) )
{
wxLogLastError("BitBlt");
}
// set masked area in buffer to BLACK (pixel value 0)
COLORREF prevBkCol = ::SetBkColor(GetHdc(), RGB(255, 255, 255));
COLORREF prevCol = ::SetTextColor(GetHdc(), RGB(0, 0, 0));
if ( !::BitBlt(dc_buffer, 0, 0, (int)width, (int)height,
dc_mask, xsrc, ysrc, SRCAND) )
{
wxLogLastError("BitBlt");
}
// set unmasked area in dest to BLACK
::SetBkColor(GetHdc(), RGB(0, 0, 0));
::SetTextColor(GetHdc(), RGB(255, 255, 255));
if ( !::BitBlt(GetHdc(), xdest, ydest, (int)width, (int)height,
dc_mask, xsrc, ysrc, SRCAND) )
{
wxLogLastError("BitBlt");
}
::SetBkColor(GetHdc(), prevBkCol); // restore colours to original values
::SetTextColor(GetHdc(), prevCol);
// OR buffer to dest
success = ::BitBlt(GetHdc(), xdest, ydest,
(int)width, (int)height,
dc_buffer, 0, 0, SRCPAINT) != 0;
if ( !success )
{
wxLogLastError("BitBlt");
}
// tidy up temporary DCs and bitmap
::SelectObject(dc_mask, 0);
::DeleteDC(dc_mask);
::SelectObject(dc_buffer, 0);
::DeleteDC(dc_buffer);
::DeleteObject(buffer_bmap);
}
}
else // no mask, just BitBlt() it
{
success = ::BitBlt(GetHdc(), xdest, ydest,
(int)width, (int)height,
GetHdcOf(*source), xsrc, ysrc, dwRop) != 0;
if ( !success )
{
wxLogLastError("BitBlt");
}
}
::SetTextColor(GetHdc(), old_textground);
::SetBkColor(GetHdc(), old_background);
return success;
}
void wxDC::DoGetSize(int *w, int *h) const
{
if ( w ) *w = ::GetDeviceCaps(GetHdc(), HORZRES);
if ( h ) *h = ::GetDeviceCaps(GetHdc(), VERTRES);
}
void wxDC::DoGetSizeMM(int *w, int *h) const
{
if ( w ) *w = ::GetDeviceCaps(GetHdc(), HORZSIZE);
if ( h ) *h = ::GetDeviceCaps(GetHdc(), VERTSIZE);
}
wxSize wxDC::GetPPI() const
{
int x = ::GetDeviceCaps(GetHdc(), LOGPIXELSX);
int y = ::GetDeviceCaps(GetHdc(), LOGPIXELSY);
return wxSize(x, y);
}
// For use by wxWindows only, unless custom units are required.
void wxDC::SetLogicalScale(double x, double y)
{
m_logicalScaleX = x;
m_logicalScaleY = y;
}
#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
// ---------------------------------------------------------------------------
// spline drawing code
// ---------------------------------------------------------------------------
#if wxUSE_SPLINES
class wxSpline: public wxObject
{
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);
}
wxList wx_spline_point_list;
void wx_draw_open_spline(wxDC *dc, wxSpline *spline)
{
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);
}
/********************* 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)
{
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 // wxUSE_SPLINES
Reference in New Issue View Git Blame Copy Permalink