consolidated TDR bandpass/lowpass mode, configuration dialog for TDR

Software/PC_Application/Traces/Math/windowfunction.h

@@ -0,0 +1,48 @@
+#ifndef WINDOWFUNCTION_H
+#define WINDOWFUNCTION_H
+
+#include <QWidget>
+#include <complex>
+#include <vector>
+
+class WindowFunction : public QObject
+{
+    Q_OBJECT;
+public:   
+    enum class Type {
+        Rectangular,
+//        Kaiser,
+        Gaussian,
+        Chebyshev,
+        Hann,
+        Hamming,
+        Blackman,
+        // always has to be the last entry
+        Last,
+    };
+    static QString typeToName(Type type);
+
+    WindowFunction(Type type = Type::Hamming);
+
+    void apply(std::vector<std::complex<double>>& data);
+
+    QWidget *createEditor();
+
+    Type getType() const;
+    QString getDescription();
+
+signals:
+    void changed();
+
+private:
+    double getFactor(unsigned int n, unsigned int N);
+    Type type;
+    // parameters for the different types. Not all windows use one and most only one.
+    // But keeping all parameters for all windows allows switching between window types
+    // while remembering the settings for each type
+    double kaiser_alpha;
+    double gaussian_sigma;
+    double chebyshev_alpha;
+};
+
+#endif // WINDOWFUNCTION_H