plot.cpp

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

    m_curves.Append( curve );
    if (!m_current) m_current = curve;

    ResetScrollbar();
}

size_t wxPlotWindow::GetCount()
{
    return m_curves.GetCount();
}

wxPlotCurve *wxPlotWindow::GetAt( size_t n )
{
    wxList::compatibility_iterator node = m_curves.Item( n );
    if (!node)
        return (wxPlotCurve*) NULL;

    return (wxPlotCurve*) node->GetData();
}

void wxPlotWindow::SetCurrentCurve( wxPlotCurve* current )
{
    m_current = current;
    m_area->Refresh( false );

    RedrawYAxis();

    wxPlotEvent event( wxEVT_PLOT_SEL_CHANGED, GetId() );
    event.SetEventObject( this );
    event.SetZoom( GetZoom() );
    event.SetCurve( m_current );
    GetEventHandler()->ProcessEvent( event );
}

void wxPlotWindow::Delete( wxPlotCurve* curve )
{
    wxList::compatibility_iterator node = m_curves.Find( curve );
    if (!node) return;

    m_curves.DeleteObject( curve );

    m_area->DeleteCurve( curve );
    m_area->Refresh( false );

    if (curve == m_current) m_current = (wxPlotCurve *) NULL;
}

wxPlotCurve *wxPlotWindow::GetCurrentCurve()
{
    return m_current;
}

void wxPlotWindow::Add( wxPlotOnOffCurve *curve )
{
    m_onOffCurves.Append( curve );
}

void wxPlotWindow::Delete( wxPlotOnOffCurve* curve )
{
    wxList::compatibility_iterator node = m_onOffCurves.Find( curve );
    if (!node) return;

    m_onOffCurves.DeleteObject( curve );
}

size_t wxPlotWindow::GetOnOffCurveCount()
{
    return m_onOffCurves.GetCount();
}

wxPlotOnOffCurve *wxPlotWindow::GetOnOffCurveAt( size_t n )
{
    wxList::compatibility_iterator node = m_onOffCurves.Item( n );
    if (!node)
        return (wxPlotOnOffCurve*) NULL;

    return (wxPlotOnOffCurve*) node->GetData();
}

void wxPlotWindow::Move( wxPlotCurve* curve, int pixels_up )
{
    m_area->DeleteCurve( curve );

    curve->SetOffsetY( curve->GetOffsetY() + pixels_up );

    m_area->Refresh( false );

    RedrawYAxis();
}

void wxPlotWindow::OnMoveUp( wxCommandEvent& WXUNUSED(event) )
{
    if (!m_current) return;

    Move( m_current, 25 );
}

void wxPlotWindow::OnMoveDown( wxCommandEvent& WXUNUSED(event) )
{
    if (!m_current) return;

    Move( m_current, -25 );
}

void wxPlotWindow::Enlarge( wxPlotCurve *curve, double factor )
{
    m_area->DeleteCurve( curve );

    int client_width;
    int client_height;
    m_area->GetClientSize( &client_width, &client_height);
    double offset = (double)curve->GetOffsetY() / (double)client_height;

    double range = curve->GetEndY() - curve->GetStartY();
    offset *= range;

    double new_range = range / factor;
    double new_offset = offset / factor;

    if (m_enlargeAroundWindowCentre)
    {
        double middle = curve->GetStartY() - offset + range/2;

        curve->SetStartY( middle - new_range / 2 + new_offset );
        curve->SetEndY( middle + new_range / 2 + new_offset  );
    }
    else
    {
        curve->SetStartY( (curve->GetStartY() - offset)/factor + new_offset );
        curve->SetEndY( (curve->GetEndY() - offset)/factor + new_offset );
    }

    m_area->Refresh( false );
    RedrawYAxis();
}

void wxPlotWindow::SetUnitsPerValue( double upv )
{
    m_xUnitsPerValue = upv;

    RedrawXAxis();
}

void wxPlotWindow::SetZoom( double zoom )
{
    double old_zoom = m_xZoom;
    m_xZoom = zoom;

    int view_x = 0;
    int view_y = 0;
    GetViewStart( &view_x, &view_y );

    wxInt32 max = 0;
    wxList::compatibility_iterator node = m_curves.GetFirst();
    while (node)
    {
        wxPlotCurve *curve = (wxPlotCurve*) node->GetData();
        if (curve->GetEndX() > max)
            max = curve->GetEndX();
        node = node->GetNext();
    }
    SetScrollbars( wxPLOT_SCROLL_STEP, wxPLOT_SCROLL_STEP,
                   (int)((max*m_xZoom)/wxPLOT_SCROLL_STEP)+1, 0,
                   (int)(view_x*zoom/old_zoom), 0,
                   true );

    RedrawXAxis();
    m_area->Refresh( true );
}

void wxPlotWindow::ResetScrollbar()
{
    wxInt32 max = 0;
    wxList::compatibility_iterator node = m_curves.GetFirst();
    while (node)
    {
        wxPlotCurve *curve = (wxPlotCurve*) node->GetData();
        if (curve->GetEndX() > max)
            max = curve->GetEndX();
        node = node->GetNext();
    }

    SetScrollbars( wxPLOT_SCROLL_STEP, wxPLOT_SCROLL_STEP,
                   (int)(((max*m_xZoom)/wxPLOT_SCROLL_STEP)+1), 0 );
}

void wxPlotWindow::AddChartTitle(const wxString& title, wxFont font,
                                 wxColour colour)
{
    m_title = title;
    m_titleFont = font;
    m_titleColour = colour;
    DrawChartTitle();
}

void wxPlotWindow::DrawChartTitle()
{
    if(m_title.size() != 0)
    {
        //If it is already added, remove child and delete
        if(m_titleStaticText)
        {
            RemoveChild( m_titleStaticText );
            m_titleStaticText->Destroy();
        }

        //Create the text control and set the font, colour
        m_titleStaticText = new wxStaticText( this, -1, m_title );
        m_titleStaticText->SetFont( m_titleFont );
        m_titleStaticText->SetForegroundColour( m_titleColour );

        //Create a sizer for the title. Prepend it to the Plot + Title sizer.
        wxBoxSizer* titleSizer = new wxBoxSizer( wxHORIZONTAL );
        titleSizer->Add( m_titleStaticText, 0, wxALIGN_CENTER | wxALL, 10 );
        m_plotAndTitleSizer->Prepend( titleSizer, 0, wxALIGN_CENTER_HORIZONTAL );

        //Finally, force layout
        m_plotAndTitleSizer->Layout();
    }
}

void wxPlotWindow::RedrawXAxis()
{
    if (m_xaxis)
        m_xaxis->Refresh( true );
}

void wxPlotWindow::RedrawYAxis()
{
    if (m_yaxis)
       m_yaxis->Refresh( true );
}

void wxPlotWindow::RedrawEverything()
{
    if (m_xaxis)
        m_xaxis->Refresh( true );
    if (m_yaxis)
        m_yaxis->Refresh( true );
    m_area->Refresh( true );

    DrawChartTitle();
}

void wxPlotWindow::OnZoomIn( wxCommandEvent& WXUNUSED(event) )
{
    SetZoom( m_xZoom * 1.5 );
}

void wxPlotWindow::OnZoomOut( wxCommandEvent& WXUNUSED(event) )
{
    SetZoom( m_xZoom * 0.6666 );
}

void wxPlotWindow::OnEnlarge( wxCommandEvent& WXUNUSED(event) )
{
    if (!m_current) return;

    Enlarge( m_current, 1.5 );
}

void wxPlotWindow::OnShrink( wxCommandEvent& WXUNUSED(event) )
{
    if (!m_current) return;

    Enlarge( m_current, 0.6666666 );
}

void wxPlotWindow::OnScroll2( wxScrollWinEvent& event )
{
    if ((!m_scrollOnThumbRelease) || (event.GetEventType() != wxEVT_SCROLLWIN_THUMBTRACK))
    {
        wxScrolledWindow::OnScroll( event );
        RedrawXAxis();
    }
}

// ----------------------------------------------------------------------------
// global functions
// ----------------------------------------------------------------------------

// FIXME MT-UNSAFE
static wxBitmap *GetEnlargeBitmap()
{
    static wxBitmap* s_bitmap = (wxBitmap *) NULL;
    static bool s_loaded = false;

    if ( !s_loaded )
    {
        s_loaded = true; // set it to true anyhow, we won't try again

        #if defined(__WXMSW__) || defined(__WXPM__)
            s_bitmap = new wxBitmap(_T("plot_enl_bmp"), wxBITMAP_TYPE_RESOURCE);
        #else
            s_bitmap = new wxBitmap( plot_enl_xpm );
        #endif
    }

    return s_bitmap;
}

static wxBitmap *GetShrinkBitmap()
{
    static wxBitmap* s_bitmap = (wxBitmap *) NULL;
    static bool s_loaded = false;

    if ( !s_loaded )
    {
        s_loaded = true; // set it to true anyhow, we won't try again

        #if defined(__WXMSW__) || defined(__WXPM__)
            s_bitmap = new wxBitmap(_T("plot_shr_bmp"), wxBITMAP_TYPE_RESOURCE);
        #else
            s_bitmap = new wxBitmap( plot_shr_xpm );
        #endif
    }

    return s_bitmap;
}

static wxBitmap *GetZoomInBitmap()
{
    static wxBitmap* s_bitmap = (wxBitmap *) NULL;
    static bool s_loaded = false;

    if ( !s_loaded )
    {
        s_loaded = true; // set it to true anyhow, we won't try again

        #if defined(__WXMSW__) || defined(__WXPM__)
            s_bitmap = new wxBitmap(_T("plot_zin_bmp"), wxBITMAP_TYPE_RESOURCE);
        #else
            s_bitmap = new wxBitmap( plot_zin_xpm );
        #endif
    }

    return s_bitmap;
}

static wxBitmap *GetZoomOutBitmap()
{
    static wxBitmap* s_bitmap = (wxBitmap *) NULL;
    static bool s_loaded = false;

    if ( !s_loaded )
    {
        s_loaded = true; // set it to true anyhow, we won't try again

        #if defined(__WXMSW__) || defined(__WXPM__)
            s_bitmap = new wxBitmap(_T("plot_zot_bmp"), wxBITMAP_TYPE_RESOURCE);
        #else
            s_bitmap = new wxBitmap( plot_zot_xpm );
        #endif
    }

    return s_bitmap;
}

static wxBitmap *GetUpBitmap()
{
    static wxBitmap* s_bitmap = (wxBitmap *) NULL;
    static bool s_loaded = false;

    if ( !s_loaded )
    {
        s_loaded = true; // set it to true anyhow, we won't try again

        #if defined(__WXMSW__) || defined(__WXPM__)
            s_bitmap = new wxBitmap(_T("plot_up_bmp"), wxBITMAP_TYPE_RESOURCE);
        #else
            s_bitmap = new wxBitmap( plot_up_xpm );
        #endif
    }

    return s_bitmap;
}

static wxBitmap *GetDownBitmap()
{
    static wxBitmap* s_bitmap = (wxBitmap *) NULL;
    static bool s_loaded = false;

    if ( !s_loaded )
    {
        s_loaded = true; // set it to true anyhow, we won't try again

        #if defined(__WXMSW__) || defined(__WXPM__)
            s_bitmap = new wxBitmap(_T("plot_dwn_bmp"), wxBITMAP_TYPE_RESOURCE);
        #else
            s_bitmap = new wxBitmap( plot_dwn_xpm );
        #endif
    }

    return s_bitmap;
}