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playground/scaleengine/TransformPlot.cpp

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+/*****************************************************************************
+ * Qwt Examples - Copyright (C) 2002 Uwe Rathmann
+ * This file may be used under the terms of the 3-clause BSD License
+ *****************************************************************************/
+
+#include "TransformPlot.h"
+
+#include <QwtPlotCurve>
+#include <QwtSyntheticPointData>
+#include <QwtTransform>
+#include <QwtLegend>
+#include <QwtLegendLabel>
+
+namespace
+{
+    class TransformData : public QwtSyntheticPointData
+    {
+      public:
+        TransformData( QwtTransform* transform )
+            : QwtSyntheticPointData( 200 )
+            , m_transform( transform )
+        {
+        }
+
+        virtual ~TransformData()
+        {
+            delete m_transform;
+        }
+
+        const QwtTransform* transform() const
+        {
+            return m_transform;
+        }
+
+        virtual double y( double x ) const QWT_OVERRIDE
+        {
+            const double min = 10.0;
+            const double max = 1000.0;
+
+            const double value = min + x * ( max - min );
+
+            const double s1 = m_transform->transform( min );
+            const double s2 = m_transform->transform( max );
+            const double s = m_transform->transform( value );
+
+            return ( s - s1 ) / ( s2 - s1 );
+        }
+
+      private:
+        const QwtTransform* m_transform;
+    };
+}
+
+TransformPlot::TransformPlot( QWidget* parent )
+    : QwtPlot( parent )
+{
+    setTitle( "Transformations" );
+    setCanvasBackground( Qt::white );
+
+    setAxisScale( QwtAxis::XBottom, 0.0, 1.0 );
+    setAxisScale( QwtAxis::YLeft, 0.0, 1.0 );
+
+    QwtLegend* legend = new QwtLegend();
+    legend->setDefaultItemMode( QwtLegendData::Checkable );
+    insertLegend( legend, QwtPlot::RightLegend );
+
+    connect( legend, SIGNAL(checked(const QVariant&,bool,int)),
+        this, SLOT(legendChecked(const QVariant&,bool)) );
+}
+
+void TransformPlot::insertTransformation(
+    const QString& title, const QColor& color, QwtTransform* transform )
+{
+    QwtPlotCurve* curve = new QwtPlotCurve( title );
+    curve->setRenderHint( QwtPlotItem::RenderAntialiased, true );
+    curve->setPen( color, 2 );
+    curve->setData( new TransformData( transform ) );
+    curve->attach( this );
+}
+
+void TransformPlot::legendChecked( const QVariant& itemInfo, bool on )
+{
+    QwtPlotItem* plotItem = infoToItem( itemInfo );
+
+    setLegendChecked( plotItem );
+
+    if ( on && plotItem->rtti() == QwtPlotItem::Rtti_PlotCurve )
+    {
+        QwtPlotCurve* curve = static_cast< QwtPlotCurve* >( plotItem );
+        TransformData* curveData = static_cast< TransformData* >( curve->data() );
+
+        Q_EMIT selected( curveData->transform()->copy() );
+    }
+}
+
+void TransformPlot::setLegendChecked( QwtPlotItem* plotItem )
+{
+    const QwtPlotItemList items = itemList();
+    for ( int i = 0; i < items.size(); i++ )
+    {
+        QwtPlotItem* item = items[ i ];
+        if ( item->testItemAttribute( QwtPlotItem::Legend ) )
+        {
+            QwtLegend* lgd = qobject_cast< QwtLegend* >( legend() );
+
+            QwtLegendLabel* label = qobject_cast< QwtLegendLabel* >(
+                lgd->legendWidget( itemToInfo( item ) ) );
+            if ( label )
+            {
+                lgd->blockSignals( true );
+                label->setChecked( item == plotItem );
+                lgd->blockSignals( false );
+            }
+        }
+    }
+}
+
+#include "moc_TransformPlot.cpp"