# HG changeset patch
# User Hasan Yavuz ÖZDERYA <hy@ozderya.net>
# Date 2017-01-29 07:45:41
# Node ID c78aec692ac0b85831105529a69b663c5b3cf33e
# Parent  da3f4cd6026d35d531090367e10a2149bcbf993e

experimental scrollbar behaviour for large data plots

diff --git a/src/plot.cpp b/src/plot.cpp
--- a/src/plot.cpp
+++ b/src/plot.cpp
@@ -41,7 +41,7 @@ Plot::Plot(QWidget* parent) :
 
     QObject::connect(&zoomer, &Zoomer::unzoomed, this, &Plot::unzoomed);
 
-    zoomer.setZoomBase();
+    zoomer.setZoomBase(QRectF(0,-1,2,500));
     grid.attach(this);
     legend.attach(this);
 
diff --git a/src/scrollzoomer.cpp b/src/scrollzoomer.cpp
--- a/src/scrollzoomer.cpp
+++ b/src/scrollzoomer.cpp
@@ -42,6 +42,8 @@ ScrollZoomer::ScrollZoomer( QWidget *can
     d_vScrollData( NULL ),
     d_inZoom( false )
 {
+    d_limits = QRectF(0, -10, 10000, 20);
+
     for ( int axis = 0; axis < QwtPlot::axisCnt; axis++ )
         d_alignCanvasToScales[ axis ] = false;
 
@@ -61,6 +63,8 @@ ScrollZoomer::~ScrollZoomer()
 
 void ScrollZoomer::rescale()
 {
+    qDebug() << "rescale";
+
     QwtScaleWidget *xScale = plot()->axisWidget( xAxis() );
     QwtScaleWidget *yScale = plot()->axisWidget( yAxis() );
 
@@ -265,16 +269,20 @@ bool ScrollZoomer::needScrollBar( Qt::Or
     if ( orientation == Qt::Horizontal )
     {
         mode = d_hScrollData->mode;
-        baseMin = zoomBase().left();
-        baseMax = zoomBase().right();
+        // baseMin = zoomBase().left();
+        // baseMax = zoomBase().right();
+        baseMin = d_limits.left();
+        baseMax = d_limits.right();
         zoomMin = zoomRect().left();
         zoomMax = zoomRect().right();
     }
     else
     {
         mode = d_vScrollData->mode;
-        baseMin = zoomBase().top();
-        baseMax = zoomBase().bottom();
+        // baseMin = zoomBase().top();
+        // baseMax = zoomBase().bottom();
+        baseMin = d_limits.top();
+        baseMax = d_limits.bottom();
         zoomMin = zoomRect().top();
         zoomMax = zoomRect().bottom();
     }
@@ -300,6 +308,8 @@ bool ScrollZoomer::needScrollBar( Qt::Or
 
 void ScrollZoomer::updateScrollBars()
 {
+    qDebug() << "updateScrollBars()";
+
     if ( !canvas() )
         return;
 
@@ -323,8 +333,10 @@ void ScrollZoomer::updateScrollBars()
         ScrollBar *sb = scrollBar( Qt::Horizontal );
         sb->setPalette( plot()->palette() );
         sb->setInverted( !plot()->axisScaleDiv( xAxis ).isIncreasing() );
-        sb->setBase( zoomBase().left(), zoomBase().right() );
+        // sb->setBase( zoomBase().left(), zoomBase().right() );
+        sb->setBase( d_limits.left(), d_limits.right() );
         sb->moveSlider( zoomRect().left(), zoomRect().right() );
+        qDebug() << "moveSlider" << zoomRect().left() << zoomRect().right();
 
         if ( !sb->isVisibleTo( canvas() ) )
         {
@@ -349,7 +361,7 @@ void ScrollZoomer::updateScrollBars()
         ScrollBar *sb = scrollBar( Qt::Vertical );
         sb->setPalette( plot()->palette() );
         sb->setInverted( plot()->axisScaleDiv( yAxis ).isIncreasing() );
-        sb->setBase( zoomBase().top(), zoomBase().bottom() );
+        sb->setBase( d_limits.top(), d_limits.bottom() );
         sb->moveSlider( zoomRect().top(), zoomRect().bottom() );
 
         if ( !sb->isVisibleTo( canvas() ) )
@@ -487,3 +499,33 @@ int ScrollZoomer::oppositeAxis( int axis
 
     return axis;
 }
+
+void ScrollZoomer::moveTo( const QPointF &pos )
+{
+    // QwtPlotZoomer::moveTo(pos);
+    // return;
+
+    double x = pos.x();
+    double y = pos.y();
+
+    if ( x < d_limits.left() )
+        x = d_limits.left();
+    if ( x > d_limits.right() - zoomRect().width() )
+        x = d_limits.right() - zoomRect().width();
+
+    if ( y < d_limits.top() )
+        y = d_limits.top();
+    if ( y > d_limits.bottom() - zoomRect().height() )
+        y = d_limits.bottom() - zoomRect().height();
+
+    qDebug() << "x,y: "<<x<<y;
+
+    if ( x != zoomRect().left() || y != zoomRect().top() )
+    {
+        auto zs = zoomStack();
+        zs[zoomRectIndex()].moveTo( x, y );
+        // d_data->zoomStack[d_data->zoomRectIndex].moveTo( x, y );
+        setZoomStack(zs, zoomRectIndex());
+        rescale();
+    }
+}
diff --git a/src/scrollzoomer.h b/src/scrollzoomer.h
--- a/src/scrollzoomer.h
+++ b/src/scrollzoomer.h
@@ -52,6 +52,9 @@ public:
 
     virtual void rescale();
 
+public Q_SLOTS:
+    virtual void moveTo( const QPointF & );
+
 protected:
     virtual ScrollBar *scrollBar( Qt::Orientation );
     virtual void updateScrollBars();
@@ -61,6 +64,8 @@ private Q_SLOTS:
     void scrollBarMoved( Qt::Orientation o, double min, double max );
 
 private:
+    QRectF d_limits;
+
     bool needScrollBar( Qt::Orientation ) const;
     int oppositeAxis( int ) const;