enhance VectorDescriptor

GUI/Model/Types/VectorDescriptor.h

@@ -25,6 +25,8 @@
 //! of three doubles, three double members, or any other construction to hold the three values.
 class VectorDescriptor {
 public:
+    VectorDescriptor() = default;
+
     //! Operates on a VectorItem.
     //!
     //! The settings (like decimals, limits) are taken from the item.
@@ -74,6 +76,7 @@ public:
         z.label = label + " (z)";
     }
 
+    // #baMigration used?
     VectorDescriptor(const QString& label, const QString& tooltip, const R3* vec,
                      const variant<QString, Unit>& unit)
         : label(label), tooltip(tooltip)
@@ -104,6 +107,38 @@ public:
         z.path = [=] { return uid() + "z"; };
     }
 
+    void init(const QString& _label, const QString& _tooltip, const R3* vec,
+              const variant<QString, Unit>& _unit)
+    {
+        label = _label;
+        tooltip = _tooltip;
+        x.limits = RealLimits::limitless();
+        y.limits = RealLimits::limitless();
+        z.limits = RealLimits::limitless();
+        x.decimals = 3;
+        y.decimals = 3;
+        z.decimals = 3;
+        x.tooltip = tooltip;
+        y.tooltip = tooltip;
+        z.tooltip = tooltip;
+        x.unit = _unit;
+        y.unit = _unit;
+        z.unit = _unit;
+        x.label = label + " (x)";
+        y.label = label + " (y)";
+        z.label = label + " (z)";
+        x.set = [=](double v) { const_cast<R3*>(vec)->setX(v); };
+        x.get = [=]() { return vec->x(); };
+        x.path = [=] { return uid() + "x"; };
+        y.set = [=](double v) { const_cast<R3*>(vec)->setY(v); };
+        y.get = [=]() { return vec->y(); };
+        y.path = [=] { return uid() + "y"; };
+        z.set = [=](double v) { const_cast<R3*>(vec)->setZ(v); };
+        z.get = [=]() { return vec->z(); };
+        z.path = [=] { return uid() + "z"; };
+    }
+
+
     QString label;   //!< A label text (short, no trailing colon)
     QString tooltip; //!< Tooltip text
     DoubleDescriptor x;