create src directory

src/utcicalculator.h

@@ -0,0 +1,44 @@
+#pragma once
+
+#include <QObject>
+#include <QVector>
+#include <QString>
+
+/*
+ UtciCalculator
+ - lit un fichier de coefficients (format ESM_3/tab-delimited)
+ - calcule UTCI via l'approximation polynomiale : UTCI = Ta + Offset(Ta, va, tm, pa)
+   where tm = Tr - Ta and pa is water vapour pressure in kPa.
+ - fournit une fonction utilitaire pour calculer pa depuis Ta et relative humidity (Magnus-Tetens).
+*/
+
+class UtciCalculator : public QObject
+{
+    Q_OBJECT
+public:
+    explicit UtciCalculator(QObject *parent = nullptr);
+
+    // Load coefficients from a file (ESM_3 table or exported txt)
+    // Return true on success.
+    //bool loadCoefficientsFromFile(const QString &path);
+
+    // Calculate UTCI.
+    // Ta: air temperature (°C)
+    // va: wind speed at 10 m (m/s)
+    // Tr: mean radiant temperature (°C)
+    // rh: relative humidity in % (0..100). If rh < 0, supply pa directly (next param) and set pa_provided=true.
+    // pa_kpa: vapour pressure in kPa (used if pa_provided==true)
+    double computeUTCI(double Ta, double va, double Tr, double rh) const;
+
+    // Utility: compute water vapour pressure (kPa) from Ta and relative humidity (Magnus formula)
+    // Ta in °C, rh in %
+    static double vapourPressureFromRH(double Ta, double rh_percent);
+
+private:
+    // coefficients in the same order as the ESM_3 polynomial table terms.
+    QVector<double> m_coeffs;
+
+    // Evaluate the polynomial offset = f(Ta, va, tm, pa)
+    double evalOffset(double Ta, double va, double tm, double pa) const;
+    void initCoefficients();  // initialise m_coeffs avec les 210 valeurs
+};