adding a few filters (no doing anything yet)

pdb-js/src/app/plot.service.ts

@@ -0,0 +1,63 @@
+import { Injectable, OnInit } from '@angular/core';
+import { HttpClient } from '@angular/common/http';
+import { Observable } from 'rxjs/Observable';
+
+
+@Injectable({
+  providedIn: 'root'
+})
+export class PlotService {
+
+  plotTypes: Array<PlotType>;
+  
+  tagFields: Observable<TagField>;
+
+  constructor(private http: HttpClient) {
+    this.plotTypes = new Array<PlotType>();
+    this.plotTypes.push(new PlotType("Scatter"));
+    this.plotTypes.push(new PlotType("Cumulative Distribution"));
+    this.plotTypes.push(new PlotType("Parallel Requests"));
+    this.plotTypes.push(new PlotType("Parallel Requests"));
+    
+    this.tagFields = new Array<TagField>();
+    
+  }
+  
+  ngOnInit() {
+    
+    
+  }
+  
+  getPlotTypes(): Array<PlotType> {
+    return this.plotTypes;
+  }
+  
+  getTagFields(): Observable<TagField> {
+    const that = this;
+    this.http.get('//localhost:8080/fields').subscribe(data => {
+      data.forEach(function(name) {
+        that.tagFields.push(new TagField(name));
+      });
+    });
+    return this.tagFields;
+  }
+}
+
+
+export class PlotType {
+  name: string;
+  
+  constructor(name: string) {
+    this.name = name;
+  }
+}
+
+export class TagField {
+  name: string;
+  
+  constructor(name: string) {
+    this.name = name;
+  }
+}
+
+