svgtest.cpp

wxGTK 是 wxWidgets 的 linux GTK+ (>2.2.3)版本。wxWidgets 是一个跨平台的 GUI 框架

{
    const int maxBitmaps = 3 ;
    wxBitmap* bitmaps[maxBitmaps];

    bitmaps[0] = new wxBitmap( new_xpm );
    bitmaps[1] = new wxBitmap( save_xpm );
    bitmaps[2] = new wxBitmap( help_xpm );

    int width = 16;
    int currentX = 5;

    toolBar->AddTool( MDI_NEW_WINDOW, *(bitmaps[0]), wxNullBitmap, false, currentX, wxDefaultCoord, (wxObject *) NULL, wxT("New SVG test window"));
    currentX += width + 5;
    toolBar->AddTool( MDI_SAVE, *bitmaps[1], wxNullBitmap, false, currentX, wxDefaultCoord, (wxObject *) NULL, wxT("Save test in SVG format"));
    currentX += width + 5;
    toolBar->AddSeparator();
    toolBar->AddTool(MDI_ABOUT, *bitmaps[2], wxNullBitmap, false, currentX, wxDefaultCoord, (wxObject *) NULL, wxT("Help"));

    toolBar->Realize();

    int i;
    for (i = 0; i < maxBitmaps; i++)
        delete bitmaps[i];
}


void MyFrame::FileSavePicture (wxCommandEvent & WXUNUSED(event) )
{
#if wxUSE_FILEDLG
    MyChild * pChild = (MyChild *)GetActiveChild ();
    if (pChild == NULL)
    {
        return ;
    }

    wxFileDialog dialog(this, wxT("Save Picture as"), wxEmptyString, pChild->GetTitle(),
        wxT("SVG vector picture files (*.svg)|*.svg"),
        wxFD_SAVE|wxFD_OVERWRITE_PROMPT);

    if (dialog.ShowModal() == wxID_OK)
    {
        if (!pChild -> OnSave ( dialog.GetPath() ))
        {
            return ;
        }
    }
    return ;
#endif // wxUSE_FILEDLG
}


// Note that MDI_NEW_WINDOW and MDI_ABOUT commands get passed
// to the parent window for processing, so no need to
// duplicate event handlers here.
BEGIN_EVENT_TABLE(MyChild, wxMDIChildFrame)
    EVT_MENU(MDI_CHILD_QUIT, MyChild::OnQuit)
    EVT_CLOSE(MyChild::OnClose)
END_EVENT_TABLE()

BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)

END_EVENT_TABLE()

// ---------------------------------------------------------------------------
// MyCanvas
// ---------------------------------------------------------------------------

// Define a constructor for my canvas
MyCanvas::MyCanvas(wxWindow *parent, const wxPoint& pos, const wxSize& size)
: wxScrolledWindow(parent, -1, pos, size,
wxSUNKEN_BORDER|wxVSCROLL|wxHSCROLL)
{
    m_child = (MyChild *) parent ;
    SetBackgroundColour(wxColour(_T("WHITE")));
    m_index = m_child->m_frame->nWinCreated % 7 ;
}


// Define the repainting behaviour
void MyCanvas::OnDraw(wxDC& dc)
{
    // vars to use ...
#if wxUSE_STATUSBAR
    wxString s ;
#endif // wxUSE_STATUSBAR
    wxPen wP ;
    wxBrush wB ;
    wxPoint points[6];
    wxColour wC;
    wxFont wF ;

    dc.SetFont(*wxSWISS_FONT);
    dc.SetPen(*wxGREEN_PEN);


    switch (m_index)
    {
        default:
        case 0:
            // draw lines to make a cross
            dc.DrawLine(0, 0, 200, 200);
            dc.DrawLine(200, 0, 0, 200);
            // draw point colored line and spline
            wP = *wxCYAN_PEN ;
            wP.SetWidth(3);
            dc.SetPen(wP);

            dc.DrawPoint (25,15) ;
            dc.DrawLine(50, 30, 200, 30);
            dc.DrawSpline(50, 200, 50, 100, 200, 10);
#if wxUSE_STATUSBAR
            s = wxT("Green Cross, Cyan Line and spline");
#endif // wxUSE_STATUSBAR
            break ;

        case 1:
            // draw standard shapes
            dc.SetBrush(*wxCYAN_BRUSH);
            dc.SetPen(*wxRED_PEN);
            dc.DrawRectangle(10, 10, 100, 70);
            wB = wxBrush (_T("DARK ORCHID"), wxTRANSPARENT);
            dc.SetBrush (wB);
            dc.DrawRoundedRectangle(50, 50, 100, 70, 20);
            dc.SetBrush (wxBrush(_T("GOLDENROD"), wxSOLID) );
            dc.DrawEllipse(100, 100, 100, 50);

            points[0].x = 100; points[0].y = 200;
            points[1].x = 70; points[1].y = 260;
            points[2].x = 160; points[2].y = 230;
            points[3].x = 40; points[3].y = 230;
            points[4].x = 130; points[4].y = 260;
            points[5].x = 100; points[5].y = 200;

            dc.DrawPolygon(5, points);
            dc.DrawLines (6, points, 160);
#if wxUSE_STATUSBAR
            s = wxT("Blue rectangle, red edge, clear rounded rectangle, gold ellipse, gold and clear stars");
#endif // wxUSE_STATUSBAR
            break ;

        case 2:
            // draw text in Arial or similar font
            dc.DrawLine(50,25,50,35);
            dc.DrawLine(45,30,55,30);
            dc.DrawText(wxT("This is a Swiss-style string"), 50, 30);
            wC = dc.GetTextForeground() ;
            dc.SetTextForeground (_T("FIREBRICK"));

            // no effect in msw ??
            dc.SetTextBackground (_T("WHEAT"));
            dc.DrawText(wxT("This is a Red string"), 50, 200);
            dc.DrawRotatedText(wxT("This is a 45 deg string"), 50, 200, 45);
            dc.DrawRotatedText(wxT("This is a 90 deg string"), 50, 200, 90);
            wF = wxFont ( 18, wxROMAN, wxITALIC, wxBOLD, false, wxT("Times New Roman"));
            dc.SetFont(wF);
            dc.SetTextForeground (wC) ;
            dc.DrawText(wxT("This is a Times-style string"), 50, 60);
#if wxUSE_STATUSBAR
            s = wxT("Swiss, Times text; red text, rotated and colored orange");
#endif // wxUSE_STATUSBAR
            break ;

        case 3 :
            // four arcs start and end points, center
            dc.SetBrush(*wxGREEN_BRUSH);
            dc.DrawArc ( 200,300, 370,230, 300,300 );
            dc.SetBrush(*wxBLUE_BRUSH);
            dc.DrawArc ( 270-50, 270-86, 270-86, 270-50, 270,270 );
            dc.SetDeviceOrigin(-10,-10);
            dc.DrawArc ( 270-50, 270-86, 270-86, 270-50, 270,270 );
            dc.SetDeviceOrigin(0,0);

            wP.SetColour (_T("CADET BLUE"));
            dc.SetPen(wP);
            dc.DrawArc ( 75,125, 110, 40, 75, 75 );

            wP.SetColour (_T("SALMON"));
            dc.SetPen(wP);
            dc.SetBrush(*wxRED_BRUSH);
            //top left corner, width and height, start and end angle
                                 // 315 same center and x-radius as last pie-arc, half Y radius
            dc.DrawEllipticArc(25,50,100,50,180.0,45.0) ;

            wP = *wxCYAN_PEN ;
            wP.SetWidth(3);
            dc.SetPen(wP);
                                 //wxTRANSPARENT));
            dc.SetBrush (wxBrush (_T("SALMON"),wxSOLID)) ;
            dc.DrawEllipticArc(300,  0,200,100, 0.0,145.0) ;
                                 //same end point
            dc.DrawEllipticArc(300, 50,200,100,90.0,145.0) ;
            dc.DrawEllipticArc(300,100,200,100,90.0,345.0) ;

#if wxUSE_STATUSBAR
            s = wxT("This is an arc test page");
#endif // wxUSE_STATUSBAR
            break ;

        case 4:
            dc.DrawCheckMark ( 30,30,25,25);
            dc.SetBrush (wxBrush (_T("SALMON"),wxTRANSPARENT));
            dc.DrawCheckMark ( 80,50,75,75);
            dc.DrawRectangle ( 80,50,75,75);
#if wxUSE_STATUSBAR
            s = wxT("Two check marks");
#endif // wxUSE_STATUSBAR
            break ;

        case 5:
            wF = wxFont ( 18, wxROMAN, wxITALIC, wxBOLD, false, wxT("Times New Roman"));
            dc.SetFont(wF);
            dc.DrawLine(0, 0, 200, 200);
            dc.DrawLine(200, 0, 0, 200);
            dc.DrawText(wxT("This is an 18pt string"), 50, 60);

            // rescale and draw in blue
            wP = *wxCYAN_PEN ;
            dc.SetPen(wP);
            dc.SetUserScale (2.0,0.5);
            dc.SetDeviceOrigin(200,0);
            dc.DrawLine(0, 0, 200, 200);
            dc.DrawLine(200, 0, 0, 200);
            dc.DrawText(wxT("This is an 18pt string 2 x 0.5 UserScaled"), 50, 60);
            dc.SetUserScale (2.0,2.0);
            dc.SetDeviceOrigin(200,200);
            dc.DrawText(wxT("This is an 18pt string 2 x 2 UserScaled"), 50, 60);

            wP = *wxRED_PEN ;
            dc.SetPen(wP);
            dc.SetUserScale (1.0,1.0);
            dc.SetDeviceOrigin(0,10);
            dc.SetMapMode (wxMM_METRIC) ; //svg ignores this
            dc.DrawLine(0, 0, 200, 200);
            dc.DrawLine(200, 0, 0, 200);
            dc.DrawText(wxT("This is an 18pt string in MapMode"), 50, 60);
#if wxUSE_STATUSBAR
            s = wxT("Scaling test page");
#endif // wxUSE_STATUSBAR
            break ;

        case 6:
            dc.DrawIcon( wxIcon(mondrian_xpm), 10, 10 );
            dc.DrawBitmap ( wxBitmap(svgbitmap_xpm), 50,15);
#if wxUSE_STATUSBAR
            s = wxT("Icon and Bitmap ");
#endif // wxUSE_STATUSBAR
            break ;

    }
#if wxUSE_STATUSBAR
    m_child->SetStatusText(s);
#endif // wxUSE_STATUSBAR
}




// ---------------------------------------------------------------------------
// MyChild
// ---------------------------------------------------------------------------

MyChild::MyChild(wxMDIParentFrame *parent, const wxString& title,
const wxPoint& pos, const wxSize& size,
const long style)
: wxMDIChildFrame(parent, -1, title, pos, size, style)
{

    m_frame = (MyFrame *) parent ;
#if wxUSE_STATUSBAR
    CreateStatusBar();
    SetStatusText(title);
#endif // wxUSE_STATUSBAR

    int w, h ;
    GetClientSize ( &w, &h );
    m_canvas = new MyCanvas(this, wxPoint(0, 0),  wxSize (w,h)  );
    // Give it scrollbars
    m_canvas->SetScrollbars(20, 20, 50, 50);

}


MyChild::~MyChild()
{
    m_frame->m_children.DeleteObject(this);
}


void MyChild::OnQuit(wxCommandEvent& WXUNUSED(event))
{
    Close(true);
}


bool MyChild::OnSave(wxString filename)
{
    wxSVGFileDC svgDC (filename, 600, 650) ;
    m_canvas->OnDraw (svgDC);
    return svgDC.Ok();
}



void MyChild::OnActivate(wxActivateEvent& event)
{
    if ( event.GetActive() && m_canvas )
        m_canvas->SetFocus();
}


void MyChild::OnClose(wxCloseEvent& event)
{
    event.Skip();
}