Changeset - 1258272f91d8
Parent rev.
Child rev.
[Not reviewed]
show-symbols
0 2 0
Hasan Yavuz ÖZDERYA - 9 years ago 2016-08-20 10:21:15
hy@ozderya.net
automatically show symbols when zoomed
2 files changed with 64 insertions and 1 deletions:
src/plot.cpp
60
1
src/plot.h
4
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src/plot.cpp
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@@ -20,12 +20,16 @@
 
#include <QRectF>
 
#include <QKeySequence>
 
#include <QColor>
 

			




	
	
	
		
 
#include <qwt_symbol.h>

			




	
	
	
		
 
#include <qwt_plot_curve.h>

			




	
	
	
		
 
#include <math.h>

			




	
	
	
		
 

			




	
	
	
		
 
#include "plot.h"

			




	
	
	
		
 
#include "utils.h"

			




	
	
	
		
 

			




	
	
	
		
 
static const int SYMBOL_SIZE = 5;

			




	
	
	
		
 
static const int SYMBOL_SHOW_AT_WIDTH = 15;

			




	
	
	
		
 

			




	
	
	
		
 
Plot::Plot(QWidget* parent) :

			




	
	
	
		
 
    QwtPlot(parent),

			




	
	
	
		
 
    zoomer(this->canvas(), false),

			




	
	
		
 
@@ -37,6 +41,7 @@ Plot::Plot(QWidget* parent) :

			




	
	
	
		
 
    showLegendAction("Legend", this)

			




	
	
	
		
 
{

			




	
	
	
		
 
    isAutoScaled = true;

			




	
	
	
		
 
    isSymbolsOn = true;

			




	
	
	
		
 

			




	
	
	
		
 
    QObject::connect(&zoomer, &Zoomer::unzoomed, this, &Plot::unzoomed);

			




	
	
	
		
 

			




	
	
		
 
@@ -80,6 +85,18 @@ Plot::Plot(QWidget* parent) :

			




	
	
	
		
 
    connect(&showLegendAction, SELECT<bool>::OVERLOAD_OF(&QAction::triggered),

			




	
	
	
		
 
            [this](bool enabled){legend.setVisible(enabled); replot();});

			




	
	
	
		
 

			




	
	
	
		
 
    connect(&zoomer, &QwtPlotZoomer::zoomed,

			




	
	
	
		
 
            [this](const QRectF &rect)

			




	
	
	
		
 
            {

			




	
	
	
		
 
                onXScaleChanged();

			




	
	
	
		
 
            });

			




	
	
	
		
 

			




	
	
	
		
 
    connect(this, &QwtPlot::itemAttached,

			




	
	
	
		
 
            [this](QwtPlotItem *plotItem, bool on)

			




	
	
	
		
 
            {

			




	
	
	
		
 
                if (isSymbolsOn) updateSymbols();

			




	
	
	
		
 
            });

			




	
	
	
		
 

			




	
	
	
		
 
    snapshotOverlay = NULL;

			




	
	
	
		
 
}

			




	
	
	
		
 

			




	
	
		
 
@@ -230,3 +247,45 @@ void Plot::flashSnapshotOverlay()

			




	
	
	
		
 
                snapshotOverlay = NULL;

			




	
	
	
		
 
            });

			




	
	
	
		
 
}

			




	
	
	
		
 

			




	
	
	
		
 
void Plot::onXScaleChanged()

			




	
	
	
		
 
{

			




	
	
	
		
 
    auto sw = axisWidget(QwtPlot::xBottom);

			




	
	
	
		
 
    auto paintDist = sw->scaleDraw()->scaleMap().pDist();

			




	
	
	
		
 
    auto scaleDist = sw->scaleDraw()->scaleMap().sDist();

			




	
	
	
		
 
    double symDisPx = paintDist / scaleDist;

			




	
	
	
		
 

			




	
	
	
		
 
    if (symDisPx > SYMBOL_SHOW_AT_WIDTH)

			




	
	
	
		
 
    {

			




	
	
	
		
 
        isSymbolsOn = true;

			




	
	
	
		
 
    }

			




	
	
	
		
 
    else

			




	
	
	
		
 
    {

			




	
	
	
		
 
        isSymbolsOn = false;

			




	
	
	
		
 
    }

			




	
	
	
		
 

			




	
	
	
		
 
    updateSymbols();

			




	
	
	
		
 
}

			




	
	
	
		
 

			




	
	
	
		
 
void Plot::updateSymbols()

			




	
	
	
		
 
{

			




	
	
	
		
 
    const QwtPlotItemList curves = itemList( QwtPlotItem::Rtti_PlotCurve );

			




	
	
	
		
 

			




	
	
	
		
 
    if (curves.size() > 0)

			




	
	
	
		
 
    {

			




	
	
	
		
 
        for (unsigned i = 0; i < curves.size(); i++)

			




	
	
	
		
 
        {

			




	
	
	
		
 
            QwtSymbol* symbol = NULL;

			




	
	
	
		
 
            QwtPlotCurve* curve = static_cast<QwtPlotCurve*>(curves[i]);

			




	
	
	
		
 
            qDebug() << i;

			




	
	
	
		
 
            if (isSymbolsOn)

			




	
	
	
		
 
            {

			




	
	
	
		
 
                symbol = new QwtSymbol(QwtSymbol::Ellipse,

			




	
	
	
		
 
                                       QBrush(Qt::white),

			




	
	
	
		
 
                                       curve->pen(),

			




	
	
	
		
 
                                       QSize(SYMBOL_SIZE, SYMBOL_SIZE));

			




	
	
	
		
 
            }

			




	
	
	
		
 
            curve->setSymbol(symbol);

			




	
	
	
		
 
        }

			




	
	
	
		
 
    }

			




	
	
	
		
 
}

			




        

    


    
    

    

        

                

                    src/plot.h
                

                

                  
                      
                        

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@@ -47,6 +47,7 @@ public:

			




	
	
	
		
 
private:

			




	
	
	
		
 
    bool isAutoScaled;

			




	
	
	
		
 
    double yMin, yMax;

			




	
	
	
		
 
    bool isSymbolsOn;

			




	
	
	
		
 
    Zoomer zoomer;

			




	
	
	
		
 
    ScaleZoomer sZoomer;

			




	
	
	
		
 
    QwtPlotGrid grid;

			




	
	
		
 
@@ -59,6 +60,8 @@ private:

			




	
	
	
		
 
    QAction darkBackgroundAction;

			




	
	
	
		
 
    QAction showLegendAction;

			




	
	
	
		
 

			




	
	
	
		
 
    /// update the display of symbols depending on `isSymbolsOn`

			




	
	
	
		
 
    void updateSymbols();

			




	
	
	
		
 
    void resetAxes();

			




	
	
	
		
 

			




	
	
	
		
 
public slots:

			




	
	
		
 
@@ -72,6 +75,7 @@ public slots:

			




	
	
	
		
 

			




	
	
	
		
 
private slots:

			




	
	
	
		
 
    void unzoomed();

			




	
	
	
		
 
    void onXScaleChanged();

			




	
	
	
		
 
};

			




	
	
	
		
 

			




	
	
	
		
 
#endif // PLOT_H

			




        

    



    


    



    



      

      





    
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