Merge pull request #252 from githubdoe/JST/fix249

fix compass not working in 8.0.0

Author: gr5

contourplot.cpp

@@ -492,8 +492,11 @@ ContourPlot::ContourPlot( QWidget *parent, ContourTools *tools, bool minimal ):
 
     tracker_ = new MyZoomer(this->canvas(), this);
 
-
-    connect(picker_, QOverload<const QPointF&>::of(&QwtPlotPicker::selected), this, &ContourPlot::selected);
+    // Using the old SIGNAL/SLOT syntax because problems with QWT.
+    // Qt is not able to match signal at runtime even if compile time checks all passed.
+    // ChatGPT tells it might be an ABI problem with QWT library but I (JST) have been unable to fix for now (2025-10-20).
+    connect(picker_, SIGNAL(selected(const QPointF&)), SLOT(selected(const QPointF&)));
+    //connect(picker_, QOverload<const QPointF&>::of(&QwtPlotPicker::selected), this, &ContourPlot::selected);
 
     QSettings settings;
     m_colorMapNdx = settings.value("colorMapType",0).toInt();

intensityplot.cpp

@@ -145,7 +145,12 @@ intensityPlot::intensityPlot(QWidget *parent):
         new QwtCompassMagnetNeedle( QwtCompassMagnetNeedle::ThinStyle ) );
     compass->setValue( 0 );
     compass->setOrigin( -90 );
-    connect(compass,&QwtAbstractSlider::valueChanged,this ,&intensityPlot::angleChanged);
+
+    // Using the old SIGNAL/SLOT syntax because problems with QWT.
+    // Qt is not able to match signal at runtime even if compile time checks all passed.
+    // ChatGPT tells it might be an ABI problem with QWT library but I (JST) have been unable to fix for now (2025-10-20).
+    connect(compass, SIGNAL(valueChanged(double)), this ,SLOT(angleChanged(double)));
+    //connect(compass,&QwtAbstractSlider::valueChanged,this ,&intensityPlot::angleChanged);
 
     populate();
     resize(QGuiApplication::primaryScreen()->availableSize() * 1./ 5.);

profileplot.cpp

@@ -198,7 +198,13 @@ ProfilePlot::ProfilePlot(QWidget *parent , ContourTools *tools):
        // new QwtCompassMagnetNeedle( QwtCompassMagnetNeedle::ThinStyle ) );
     compass->setValue( 270 );
     compass->setOrigin( -90 );
-    connect(compass,&QwtAbstractSlider::valueChanged,this ,&ProfilePlot::angleChanged);
+    
+    // Using the old SIGNAL/SLOT syntax because problems with QWT.
+    // Qt is not able to match signal at runtime even if compile time checks all passed.
+    // ChatGPT tells it might be an ABI problem with QWT library but I (JST) have been unable to fix for now (2025-10-20).
+    connect(compass, SIGNAL(valueChanged(double)), this ,SLOT(angleChanged(double)));
+    //connect(compass,&QwtAbstractSlider::valueChanged,this ,&ProfilePlot::angleChanged);
+    
     connect(m_tools, &ContourTools::newDisplayErrorRange,
             this, &ProfilePlot::newDisplayErrorRange);
     connect(m_tools, &ContourTools::contourZeroOffsetChanged, this, &ProfilePlot::zeroOffsetChanged);