only allow zoom by mouse wheel or selection when time axis is available

pdb-js/src/app/visualization-page/visualization-page.component.ts

@@ -1,5 +1,5 @@
 import { Component, OnInit, ViewChild } from '@angular/core';
-import { PlotService, PlotType, PlotRequest, PlotResponse, TagField, FilterDefaults  } from '../plot.service';
+import { PlotService, PlotType, PlotRequest, PlotResponse, TagField, FilterDefaults, DataType, AxesTypes  } from '../plot.service';
 import { Observable } from 'rxjs/Observable';
 import { FormControl, Validators } from '@angular/forms';
 import { MatSnackBar } from '@angular/material/snack-bar';
@@ -99,11 +99,27 @@ export class VisualizationPageComponent implements OnInit {
     const request = this.createPlotRequest();
     this.galleryView.renderGallery(request, this.splitBy.name);
   }
+  
+  getAxes() : AxesTypes {
+    
+    var x = new Set<DataType>();
+    var y = new Set<DataType>();
+    
+    for(var i = 0; i < this.selectedPlotType.length; i++){
+      var plotType = this.selectedPlotType[i];
+      x.add(plotType.xAxis);
+      y.add(plotType.yAxis);
+    }
+    
+    return new AxesTypes(x,y);
+  }
     
   plot(){
     const that = this;
     
     that.plotView.imageUrl = '';
+    this.plotView.axes = this.getAxes();
+    console.log(JSON.stringify(this.getAxes()));
     that.galleryView.show=false;
     document.dispatchEvent(new Event("invadersStart", {}));