Multi-layer grib.

Author: sebastien-rosset

plugins/grib_pi/src/GribOverlayFactory.h

@@ -206,6 +206,7 @@ class GRIBOverlayFactory : public wxEvtHandler {
   }
 
   GribTimelineRecordSet *m_pGribTimelineRecordSet;
+  GRIBLayerSet *m_pGribLayerSet;
 
   void DrawMessageZoomOut(PlugIn_ViewPort *vp);
   void GetGraphicColor(int settings, double val, unsigned char &r,

plugins/grib_pi/src/grib_layer_set.cpp

@@ -443,5 +443,11 @@ bool GRIBLayerSet::getTimeInterpolatedValues(double& M, double& A, int idx1,
 
 // TODO: refactor and remove.
 GribTimelineRecordSet* GRIBLayerSet::GetTimeLineRecordSet(wxDateTime time) {
+  for (auto& pair : m_layers) {
+    if (pair.second && pair.second->IsEnabled()) {
+      // Return the first valid timeline record set for backwards compatibility.
+      return pair.second->GetTimeLineRecordSet(time);
+    }
+  }
   return nullptr;
 }

plugins/grib_pi/src/grib_layer_set.h

@@ -201,7 +201,16 @@ class DECL_EXP GRIBLayerSet {
   /** Get smallest time interval between records in minutes. */
   int GetSmallestInterval() const;
 
-  // TODO: refactor and remove.
+  /**
+   * Get the weather parameter values at a specific time.
+   *
+   * @param time The target datetime for which to interpolate GRIB records.
+   * @return Pointer to GribTimelineRecordSet containing temporally interpolated
+   * data, or NULL if no valid data.
+   *
+   * @note Return the values from the first layer that has data.
+   * @todo Refactor to use the merge strategy.
+   */
   GribTimelineRecordSet* GetTimeLineRecordSet(wxDateTime time);
 
   double getTimeInterpolatedValue(int idx, double lon, double lat,