adding the python sample for graphicscontext
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@49820 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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Stefan Csomor
parent
82a234fbff
commit
7a5c82b147
@ -77,6 +77,7 @@ enum ScreenToShow
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Show_Splines,
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#if wxUSE_GRAPHICS_CONTEXT
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Show_Alpha,
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Show_Graphics,
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#endif
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Show_Gradient,
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Show_Max
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@ -193,6 +194,7 @@ protected:
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void DrawWithLogicalOps(wxDC& dc);
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#if wxUSE_GRAPHICS_CONTEXT
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void DrawAlpha(wxDC& dc);
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void DrawGraphics(wxGraphicsContext* gc);
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#endif
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void DrawRegions(wxDC& dc);
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void DrawCircles(wxDC& dc);
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@ -241,6 +243,7 @@ enum
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File_ShowSplines,
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#if wxUSE_GRAPHICS_CONTEXT
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File_ShowAlpha,
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File_ShowGraphics,
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#endif
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File_ShowGradients,
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MenuShow_Last = File_ShowGradients,
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@ -962,6 +965,121 @@ void MyCanvas::DrawAlpha(wxDC& dc)
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#endif
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#if wxUSE_GRAPHICS_CONTEXT
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const int BASE = 80.0;
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const int BASE2 = BASE/2;
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const int BASE4 = BASE/4;
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static inline double DegToRad(double deg) { return (deg * M_PI) / 180.0; }
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// modeled along Robin Dunn's GraphicsContext.py sample
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void MyCanvas::DrawGraphics(wxGraphicsContext* gc)
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{
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wxFont font = wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT);
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gc->SetFont(font,*wxBLACK);
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// make a path that contains a circle and some lines, centered at 0,0
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wxGraphicsPath path = gc->CreatePath() ;
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path.AddCircle( 0, 0, BASE2 );
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path.MoveToPoint(0, -BASE2);
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path.AddLineToPoint(0, BASE2);
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path.MoveToPoint(-BASE2, 0);
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path.AddLineToPoint(BASE2, 0);
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path.CloseSubpath();
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path.AddRectangle(-BASE4, -BASE4/2, BASE2, BASE4);
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// Now use that path to demonstrate various capbilites of the grpahics context
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gc->PushState(); // save current translation/scale/other state
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gc->Translate(60, 75); // reposition the context origin
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gc->SetPen(wxPen("navy", 1));
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gc->SetBrush(wxBrush("pink"));
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for( int i = 0 ; i < 3 ; ++i )
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{
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wxString label;
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switch( i )
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{
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case 0 :
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label = "StrokePath";
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break;
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case 1 :
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label = "FillPath";
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break;
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case 2 :
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label = "DrawPath";
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break;
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}
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wxDouble w, h;
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gc->GetTextExtent(label, &w, &h, NULL, NULL);
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gc->DrawText(label, -w/2, -BASE2-h-4);
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switch( i )
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{
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case 0 :
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gc->StrokePath(path);
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break;
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case 1 :
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gc->FillPath(path);
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break;
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case 2 :
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gc->DrawPath(path);
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break;
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}
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gc->Translate(2*BASE, 0);
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}
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gc->PopState(); // restore saved state
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gc->PushState(); // save it again
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gc->Translate(60, 200); // offset to the lower part of the window
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gc->DrawText("Scale", 0, -BASE2);
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gc->Translate(0, 20);
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gc->SetBrush(wxBrush(wxColour(178, 34, 34, 128)));// 128 == half transparent
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for( int i = 0 ; i < 8 ; ++i )
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{
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gc->Scale(1.08, 1.08); // increase scale by 8%
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gc->Translate(5,5);
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gc->DrawPath(path);
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}
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gc->PopState(); // restore saved state
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gc->PushState(); // save it again
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gc->Translate(400, 200);
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gc->DrawText("Rotate", 0, -BASE2);
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// Move the origin over to the next location
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gc->Translate(0, 75);
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// draw our path again, rotating it about the central point,
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// and changing colors as we go
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for ( int angle = 0 ; angle < 360 ; angle += 30 )
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{
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gc->PushState(); // save this new current state so we can
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// pop back to it at the end of the loop
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wxImage::RGBValue val = wxImage::HSVtoRGB(wxImage::HSVValue(float(angle)/360, 1, 1));
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gc->SetBrush(wxBrush(wxColour(val.red, val.green, val.blue, 64)));
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gc->SetPen(wxPen(wxColour(val.red, val.green, val.blue, 128)));
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// use translate to artfully reposition each drawn path
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gc->Translate(1.5 * BASE2 * cos(DegToRad(angle)),
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1.5 * BASE2 * sin(DegToRad(angle)));
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// use Rotate to rotate the path
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gc->Rotate(DegToRad(angle));
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// now draw it
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gc->DrawPath(path);
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gc->PopState();
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}
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gc->PopState();
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}
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#endif
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void MyCanvas::DrawCircles(wxDC& dc)
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{
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int x = 100,
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@ -1343,6 +1461,9 @@ void MyCanvas::OnPaint(wxPaintEvent &WXUNUSED(event))
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case Show_Alpha:
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DrawAlpha(dc);
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break;
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case Show_Graphics:
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DrawGraphics(gdc.GetGraphicsContext());
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break;
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#endif
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case Show_Gradient:
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@ -1416,6 +1537,9 @@ MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
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#endif
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menuFile->Append(File_ShowSplines, _T("&Splines screen\tF11"));
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menuFile->Append(File_ShowGradients, _T("&Gradients screen\tF12"));
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#if wxUSE_GRAPHICS_CONTEXT
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menuFile->Append(File_ShowGraphics, _T("&Graphics screen\tF13"));
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#endif
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menuFile->AppendSeparator();
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menuFile->AppendCheckItem(File_Clip, _T("&Clip\tCtrl-C"), _T("Clip/unclip drawing"));
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#if wxUSE_GRAPHICS_CONTEXT
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