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Add option to show bounding box in drawing sample

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Visualizing bounding box can be helpful in diagnosing problems with determining extents of drawing operations.
This commit is contained in:
Artur Wieczorek
2017-03-02 20:57:30 +01:00
parent a0cb7c1291
commit c0b6540c6f
1 changed files with 29 additions and 0 deletions
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29
samples/drawing/drawing.cpp
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@@ -127,6 +127,7 @@ public:
wxGraphicsRenderer* GetRenderer() const { return m_renderer; }
#endif // wxUSE_GRAPHICS_CONTEXT
void UseBuffer(bool use) { m_useBuffer = use; Refresh(); }
void ShowBoundingBox(bool show) { m_showBBox = show; Refresh(); }
void Draw(wxDC& dc);
@@ -173,6 +174,7 @@ private:
wxGraphicsRenderer* m_renderer;
#endif
bool m_useBuffer;
bool m_showBBox;
wxDECLARE_EVENT_TABLE();
};
@@ -253,6 +255,8 @@ public:
void OnSave(wxCommandEvent& event);
void OnShow(wxCommandEvent &event);
void OnOption(wxCommandEvent &event);
void OnBoundingBox(wxCommandEvent& evt);
void OnBoundingBoxUpdateUI(wxUpdateUIEvent& evt);
#if wxUSE_COLOURDLG
wxColour SelectColour();
@@ -326,6 +330,7 @@ enum
#endif
#endif // __WXMSW__
#endif // wxUSE_GRAPHICS_CONTEXT
File_BBox,
File_Clip,
File_Buffer,
File_Copy,
@@ -512,6 +517,7 @@ MyCanvas::MyCanvas(MyFrame *parent)
m_renderer = NULL;
#endif
m_useBuffer = false;
m_showBBox = false;
}
void MyCanvas::DrawTestBrushes(wxDC& dc)
@@ -1855,6 +1861,15 @@ void MyCanvas::Draw(wxDC& pdc)
default:
break;
}
// For drawing with raw wxGraphicsContext
// there is no bounding box to obtain.
if ( m_showBBox && m_show != File_ShowGraphics)
{
dc.SetPen(wxPen(wxColor(0, 128, 0), 1, wxPENSTYLE_DOT));
dc.SetBrush(*wxTRANSPARENT_BRUSH);
dc.DrawRectangle(dc.MinX(), dc.MinY(), dc.MaxX()-dc.MinX()+1, dc.MaxY()-dc.MinY()+1);
}
}
void MyCanvas::OnMouseMove(wxMouseEvent &event)
@@ -1994,6 +2009,8 @@ wxBEGIN_EVENT_TABLE(MyFrame, wxFrame)
EVT_MENU (File_Buffer, MyFrame::OnBuffer)
EVT_MENU (File_Copy, MyFrame::OnCopy)
EVT_MENU (File_Save, MyFrame::OnSave)
EVT_MENU (File_BBox, MyFrame::OnBoundingBox)
EVT_UPDATE_UI (File_BBox, MyFrame::OnBoundingBoxUpdateUI)
EVT_MENU_RANGE(MenuShow_First, MenuShow_Last, MyFrame::OnShow)
@@ -2046,6 +2063,8 @@ MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
#endif // __WXMSW__
#endif // wxUSE_GRAPHICS_CONTEXT
menuFile->AppendSeparator();
menuFile->AppendCheckItem(File_BBox, wxS("Show bounding box\tCtrl-B"),
wxS("Show extents used in drawing operations"));
menuFile->AppendCheckItem(File_Clip, wxT("&Clip\tCtrl-C"), wxT("Clip/unclip drawing"));
menuFile->AppendCheckItem(File_Buffer, wxT("&Use wx&BufferedPaintDC\tCtrl-Z"), wxT("Buffer painting"));
menuFile->AppendSeparator();
@@ -2350,6 +2369,16 @@ void MyFrame::OnOption(wxCommandEvent& event)
m_canvas->Refresh();
}
void MyFrame::OnBoundingBox(wxCommandEvent& evt)
{
m_canvas->ShowBoundingBox(evt.IsChecked());
}
void MyFrame::OnBoundingBoxUpdateUI(wxUpdateUIEvent& evt)
{
evt.Enable(m_canvas->GetPage() != File_ShowGraphics);
}
void MyFrame::PrepareDC(wxDC& dc)
{
dc.SetLogicalOrigin( m_xLogicalOrigin, m_yLogicalOrigin );