From 530a7383f26e57b61748d76502229283462a0ede Mon Sep 17 00:00:00 2001
From: Robert Roebling <robert@roebling.de>
Date: Tue, 15 Feb 2000 09:37:39 +0000
Subject: [PATCH]   Many plot window gooddies.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@6023 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 docs/latex/wx/plotwindow.tex | 18 +++++++
 docs/latex/wx/scrlwevt.tex   | 15 +++---
 docs/latex/wx/scrolevt.tex   |  1 +
 include/wx/generic/plot.h    | 18 ++++++-
 src/generic/plot.cpp         | 92 ++++++++++++++++++++++++++++--------
 src/generic/scrolwin.cpp     |  1 +
 6 files changed, 117 insertions(+), 28 deletions(-)

diff --git a/docs/latex/wx/plotwindow.tex b/docs/latex/wx/plotwindow.tex
index cb37e22179..1ae78ccccf 100644
--- a/docs/latex/wx/plotwindow.tex
+++ b/docs/latex/wx/plotwindow.tex
@@ -153,3 +153,21 @@ Helper function which redraws the X axis.
 
 Helper function which redraws the Y axis.
 
+\membersection{wxPlotWindow::SetScrollOnThumbRelease}\label{wxplotwindowsetscrollonthumbrelease}
+
+\func{void}{SetScrollOnThumbRelease}{\param{bool}{ onrelease = TRUE}}
+
+This function controls if the plot area will get scrolled only if the scrollbar thumb
+has been release or also if the thumb is being dragged. When displaying large amounts
+of data, it might become impossible to display the data fast enough to produce smooth
+scrolling and then this function should be called.
+
+\membersection{wxPlotWindow::SetEnlargeAroundWindowCentre}\label{wxplotwindowsetenlargearoundwindowcentre}
+
+\func{void}{SetEnlargeAroundWindowCentre}{\param{bool}{ aroundwindow = TRUE}}
+
+Depending on the kind of data you display, the enlarging the individual curves might
+have different desired effects. Sometimes, the data will be supposed to get enlarged
+with the fixed point being the origin, sometimes the fixed point should be the centre
+of the current drawing area. This function controls this behaviour.
+
diff --git a/docs/latex/wx/scrlwevt.tex b/docs/latex/wx/scrlwevt.tex
index 37c45afe0e..302b8eb0a0 100644
--- a/docs/latex/wx/scrlwevt.tex
+++ b/docs/latex/wx/scrlwevt.tex
@@ -20,14 +20,15 @@ for intercepting scroll window events from the receiving window.
 \twocolwidtha{7cm}
 \begin{twocollist}\itemsep=0pt
 \twocolitem{{\bf EVT\_SCROLLWIN(func)}}{Process all scroll events.}
-\twocolitem{{\bf EVT\_SCROLLWIN\_TOP(func)}}{Process wxEVT\_SCROLL\_TOP scroll-to-top events.}
-\twocolitem{{\bf EVT\_SCROLLWIN\_BOTTOM(func)}}{Process wxEVT\_SCROLL\_TOP scroll-to-bottom events.}
-\twocolitem{{\bf EVT\_SCROLLWIN\_LINEUP(func)}}{Process wxEVT\_SCROLL\_LINEUP line up events.}
-\twocolitem{{\bf EVT\_SCROLLWIN\_LINEDOWN(func)}}{Process wxEVT\_SCROLL\_LINEDOWN line down events.}
-\twocolitem{{\bf EVT\_SCROLLWIN\_PAGEUP(func)}}{Process wxEVT\_SCROLL\_PAGEUP page up events.}
-\twocolitem{{\bf EVT\_SCROLLWIN\_PAGEDOWN(func)}}{Process wxEVT\_SCROLL\_PAGEDOWN page down events.}
-\twocolitem{{\bf EVT\_SCROLLWIN\_THUMBTRACK(func)}}{Process wxEVT\_SCROLL\_THUMBTRACK thumbtrack events (frequent events
+\twocolitem{{\bf EVT\_SCROLLWIN\_TOP(func)}}{Process wxEVT\_SCROLLWIN\_TOP scroll-to-top events.}
+\twocolitem{{\bf EVT\_SCROLLWIN\_BOTTOM(func)}}{Process wxEVT\_SCROLLWIN\_TOP scroll-to-bottom events.}
+\twocolitem{{\bf EVT\_SCROLLWIN\_LINEUP(func)}}{Process wxEVT\_SCROLLWIN\_LINEUP line up events.}
+\twocolitem{{\bf EVT\_SCROLLWIN\_LINEDOWN(func)}}{Process wxEVT\_SCROLLWIN\_LINEDOWN line down events.}
+\twocolitem{{\bf EVT\_SCROLLWIN\_PAGEUP(func)}}{Process wxEVT\_SCROLLWIN\_PAGEUP page up events.}
+\twocolitem{{\bf EVT\_SCROLLWIN\_PAGEDOWN(func)}}{Process wxEVT\_SCROLLWIN\_PAGEDOWN page down events.}
+\twocolitem{{\bf EVT\_SCROLLWIN\_THUMBTRACK(func)}}{Process wxEVT\_SCROLLWIN\_THUMBTRACK thumbtrack events (frequent events
 sent as the user drags the thumtrack).}
+\twocolitem{{\bf EVT\_SCROLLWIN\_THUMBRELEASE(func)}}{Process wxEVT\_SCROLLWIN\_THUMBRELEASE thumb release events.}
 \end{twocollist}%
 
 \wxheading{See also}
diff --git a/docs/latex/wx/scrolevt.tex b/docs/latex/wx/scrolevt.tex
index 3b5f782119..f0870eaf54 100644
--- a/docs/latex/wx/scrolevt.tex
+++ b/docs/latex/wx/scrolevt.tex
@@ -33,6 +33,7 @@ without window IDs for intercepting scroll events from the receiving window.
 \twocolitem{{\bf EVT\_SCROLL\_PAGEDOWN(func)}}{Process wxEVT\_SCROLL\_PAGEDOWN page down events.}
 \twocolitem{{\bf EVT\_SCROLL\_THUMBTRACK(func)}}{Process wxEVT\_SCROLL\_THUMBTRACK thumbtrack events (frequent events
 sent as the user drags the thumtrack).}
+\twocolitem{{\bf EVT\_SCROLL\_THUMBRELEASE(func)}}{Process wxEVT\_SCROLL\_THUMBRELEASE thumb release events.}
 \twocolitem{{\bf EVT\_COMMAND\_SCROLL(id, func)}}{Process all scroll events.}
 \twocolitem{{\bf EVT\_COMMAND\_SCROLL\_TOP(id, func)}}{Process wxEVT\_SCROLL\_TOP scroll-to-top events.}
 \twocolitem{{\bf EVT\_COMMAND\_SCROLL\_BOTTOM(id, func)}}{Process wxEVT\_SCROLL\_TOP scroll-to-bottom events.}
diff --git a/include/wx/generic/plot.h b/include/wx/generic/plot.h
index 919bbebc82..f046a6e78d 100644
--- a/include/wx/generic/plot.h
+++ b/include/wx/generic/plot.h
@@ -213,7 +213,20 @@ public:
     void SetZoom( double zoom );
     double GetZoom()
         { return m_xZoom; }
-    
+        
+    // options
+    // -------
+
+    void SetScrollOnThumbRelease( bool scrollOnThumbRelease = TRUE )
+        { m_scrollOnThumbRelease = scrollOnThumbRelease; }
+    bool GetScrollOnThumbRelease()
+        { return m_scrollOnThumbRelease; }
+        
+    void SetEnlargeAroundWindowCentre( bool enlargeAroundWindowCentre = TRUE )
+        { m_enlargeAroundWindowCentre = enlargeAroundWindowCentre; }
+    bool GetEnlargeAroundWindowCentre()
+        { return m_enlargeAroundWindowCentre; }
+
     // events (may be overridden)
     // --------------------------
 
@@ -249,6 +262,9 @@ private:
     wxPlotXAxisArea   *m_xaxis;
     wxPlotYAxisArea   *m_yaxis;
     wxPlotCurve       *m_current;
+    
+    bool               m_scrollOnThumbRelease;
+    bool               m_enlargeAroundWindowCentre;
 
     DECLARE_CLASS(wxPlotWindow)
     DECLARE_EVENT_TABLE()
diff --git a/src/generic/plot.cpp b/src/generic/plot.cpp
index 4d21d4e87b..46ded83bd8 100644
--- a/src/generic/plot.cpp
+++ b/src/generic/plot.cpp
@@ -60,6 +60,12 @@ static wxBitmap *GetZoomOutBitmap();
 static wxBitmap *GetUpBitmap();
 static wxBitmap *GetDownBitmap();
 
+//-----------------------------------------------------------------------------
+// consts
+//-----------------------------------------------------------------------------
+
+#define wxPLOT_SCROLL_STEP  30
+
 //-----------------------------------------------------------------------------
 // wxPlotEvent
 //-----------------------------------------------------------------------------
@@ -115,8 +121,8 @@ void wxPlotArea::OnMouse( wxMouseEvent &event )
     int view_x;
     int view_y;
     m_owner->GetViewStart( &view_x, &view_y );
-    view_x *= 10;
-    view_y *= 10;
+    view_x *= wxPLOT_SCROLL_STEP;
+    view_y *= wxPLOT_SCROLL_STEP;
     
     int x = event.GetX();
     int y = event.GetY();
@@ -176,7 +182,7 @@ void wxPlotArea::DrawCurve( wxDC *dc, wxPlotCurve *curve, int from, int to )
     int view_x;
     int view_y;
     m_owner->GetViewStart( &view_x, &view_y );
-    view_x *= 10;
+    view_x *= wxPLOT_SCROLL_STEP;
     
     if (from == -1)
         from = view_x;
@@ -187,6 +193,8 @@ void wxPlotArea::DrawCurve( wxDC *dc, wxPlotCurve *curve, int from, int to )
     
     if (to == -1)
         to = view_x + client_width;
+        
+    to += 2;  // no idea why this is needed
 
     double zoom = m_owner->GetZoom();
 
@@ -219,8 +227,8 @@ void wxPlotArea::OnPaint( wxPaintEvent &WXUNUSED(event) )
     int view_x;
     int view_y;
     m_owner->GetViewStart( &view_x, &view_y );
-    view_x *= 10;
-    view_y *= 10;
+    view_x *= wxPLOT_SCROLL_STEP;
+    view_y *= wxPLOT_SCROLL_STEP;
 
     wxPaintDC dc( this );
     m_owner->PrepareDC( dc );
@@ -286,6 +294,7 @@ wxPlotXAxisArea::wxPlotXAxisArea( wxPlotWindow *parent )
     m_owner = parent;
     
     SetBackgroundColour( *wxWHITE );
+    SetFont( *wxSMALL_FONT );
 }
 
 void wxPlotXAxisArea::OnMouse( wxMouseEvent &event )
@@ -296,8 +305,8 @@ void wxPlotXAxisArea::OnMouse( wxMouseEvent &event )
     int view_x;
     int view_y;
     m_owner->GetViewStart( &view_x, &view_y );
-    view_x *= 10;
-    view_y *= 10;
+    view_x *= wxPLOT_SCROLL_STEP;
+    view_y *= wxPLOT_SCROLL_STEP;
     
     int x = event.GetX();
     int y = event.GetY();
@@ -312,8 +321,8 @@ void wxPlotXAxisArea::OnPaint( wxPaintEvent &WXUNUSED(event) )
     int view_x;
     int view_y;
     m_owner->GetViewStart( &view_x, &view_y );
-    view_x *= 10;
-    view_y *= 10;
+    view_x *= wxPLOT_SCROLL_STEP;
+    view_y *= wxPLOT_SCROLL_STEP;
 
     wxPaintDC dc( this );
     
@@ -374,8 +383,14 @@ void wxPlotXAxisArea::OnPaint( wxPaintEvent &WXUNUSED(event) )
         {
             dc.DrawLine( x, 5, x, 15 );
             wxString label;
-            if (range < 10)
-                label.Printf( wxT("%.1f"), current );
+            if (range < 50)
+            {
+                label.Printf( wxT("%f"), current );
+                while (label.Last() == wxT('0')) 
+                    label.RemoveLast();
+                if ((label.Last() == wxT('.')) || (label.Last() == wxT(',')))
+                    label.Append( wxT('0') );
+            }
             else
                 label.Printf( wxT("%d"), (int)floor(current) );
             dc.DrawText( label, x-4, 20 );
@@ -406,6 +421,7 @@ wxPlotYAxisArea::wxPlotYAxisArea( wxPlotWindow *parent )
     m_owner = parent;
     
     SetBackgroundColour( *wxWHITE );
+    SetFont( *wxSMALL_FONT );
 }
 
 void wxPlotYAxisArea::OnMouse( wxMouseEvent &WXUNUSED(event) )
@@ -473,7 +489,16 @@ void wxPlotYAxisArea::OnPaint( wxPaintEvent &WXUNUSED(event) )
         {
             dc.DrawLine( client_width-15, y, client_width-7, y );
             wxString label;
-            label.Printf( wxT("%.1f"), current );
+            if (range < 50)
+            {
+                label.Printf( wxT("%f"), current );
+                while (label.Last() == wxT('0')) 
+                    label.RemoveLast();
+                if ((label.Last() == wxT('.')) || (label.Last() == wxT(',')))
+                    label.Append( wxT('0') );
+            }
+            else
+                label.Printf( wxT("%d"), (int)floor(current) );
             dc.DrawText( label, 5, y-7 );
         }
 
@@ -519,6 +544,9 @@ wxPlotWindow::wxPlotWindow( wxWindow *parent, wxWindowID id, const wxPoint &pos,
 {
     m_xUnitsPerValue = 1.0;
     m_xZoom = 1.0;
+    
+    m_enlargeAroundWindowCentre = FALSE;
+    m_scrollOnThumbRelease = FALSE;
 
     m_area = new wxPlotArea( this );
     wxBoxSizer *mainsizer = new wxBoxSizer( wxHORIZONTAL );
@@ -675,11 +703,29 @@ 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 middle = curve->GetEndY() - range/2;
-    curve->SetStartY( middle - new_range / 2 );
-    curve->SetEndY( middle + new_range / 2 );
+    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();
@@ -710,7 +756,10 @@ void wxPlotWindow::SetZoom( double zoom )
             max = curve->GetEndX();
         node = node->Next();
     }
-    SetScrollbars( 10, 10, (int)((max*m_xZoom)/10)+1, 0, (int)view_x*zoom/old_zoom, 0 );
+    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 );
@@ -728,7 +777,8 @@ void wxPlotWindow::ResetScrollbar()
         node = node->Next();
     }
     
-    SetScrollbars( 10, 10, ((max*m_xZoom)/10)+1, 0 );
+    SetScrollbars( wxPLOT_SCROLL_STEP, wxPLOT_SCROLL_STEP, 
+                   ((max*m_xZoom)/wxPLOT_SCROLL_STEP)+1, 0 );
 }
 
 void wxPlotWindow::RedrawXAxis()
@@ -778,9 +828,11 @@ void wxPlotWindow::OnShrink( wxCommandEvent& WXUNUSED(event) )
 
 void wxPlotWindow::OnScroll2( wxScrollWinEvent& event )
 {
-    wxScrolledWindow::OnScroll( event );
-    
-    RedrawXAxis();
+    if ((!m_scrollOnThumbRelease) || (event.GetEventType() != wxEVT_SCROLLWIN_THUMBTRACK))
+    {
+        wxScrolledWindow::OnScroll( event );
+        RedrawXAxis();
+    }
 }
 
 // ----------------------------------------------------------------------------
diff --git a/src/generic/scrolwin.cpp b/src/generic/scrolwin.cpp
index 17facb6ea2..74b4d6bbd2 100644
--- a/src/generic/scrolwin.cpp
+++ b/src/generic/scrolwin.cpp
@@ -317,6 +317,7 @@ int wxScrolledWindow::CalcScrollInc(wxScrollWinEvent& event)
             break;
         }
         case wxEVT_SCROLLWIN_THUMBTRACK:
+        case wxEVT_SCROLLWIN_THUMBRELEASE:
         {
             if (orient == wxHORIZONTAL)
                 nScrollInc = pos - m_xScrollPosition;
-- 
2.45.2

