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examples/bode/ComplexNumber.h

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+/*****************************************************************************
+ * Qwt Examples
+ * Copyright (C) 1997   Josef Wilgen
+ * Copyright (C) 2002   Uwe Rathmann
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the Qwt License, Version 1.0
+ *****************************************************************************/
+
+#pragma once
+
+class ComplexNumber
+{
+  public:
+    ComplexNumber();
+    ComplexNumber( double r, double i = 0.0 );
+
+    double real() const;
+    double imag() const;
+
+    friend ComplexNumber operator*(
+        const ComplexNumber&, const ComplexNumber& );
+
+    friend ComplexNumber operator+(
+        const ComplexNumber&, const ComplexNumber& );
+
+    friend ComplexNumber operator-(
+        const ComplexNumber&, const ComplexNumber& );
+    friend ComplexNumber operator/(
+        const ComplexNumber&, const ComplexNumber& );
+
+  private:
+    double m_real;
+    double m_imag;
+};
+
+inline ComplexNumber::ComplexNumber()
+    : m_real( 0.0 )
+    , m_imag( -0.0 )
+{
+}
+
+inline ComplexNumber::ComplexNumber( double re, double im )
+    : m_real( re )
+    , m_imag( im )
+{
+}
+
+inline double ComplexNumber::real() const
+{
+    return m_real;
+}
+
+inline double ComplexNumber::imag() const
+{
+    return m_imag;
+}
+
+inline ComplexNumber operator+(
+    const ComplexNumber& x1, const ComplexNumber& x2 )
+{
+    return ComplexNumber( x1.m_real + x2.m_real, x1.m_imag + x2.m_imag );
+}
+
+inline ComplexNumber operator-(
+    const ComplexNumber& x1, const ComplexNumber& x2 )
+{
+    return ComplexNumber( x1.m_real - x2.m_real, x1.m_imag - x2.m_imag );
+}
+
+inline ComplexNumber operator*(
+    const ComplexNumber& x1, const ComplexNumber& x2 )
+{
+    return ComplexNumber( x1.m_real * x2.m_real - x1.m_imag * x2.m_imag,
+        x1.m_real * x2.m_imag + x2.m_real * x1.m_imag );
+}
+
+inline ComplexNumber operator/(
+    const ComplexNumber& x1, const ComplexNumber& x2 )
+{
+    double denom = x2.m_real * x2.m_real + x2.m_imag * x2.m_imag;
+
+    return ComplexNumber(
+        ( x1.m_real * x2.m_real + x1.m_imag * x2.m_imag ) / denom,
+        ( x1.m_imag * x2.m_real - x2.m_imag * x1.m_real ) / denom
+        );
+}