first step to show plot on dashboard

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

@@ -180,15 +180,14 @@ export class VisualizationPageComponent implements OnInit {
       }
     });
   }
-  
-  createPlotRequest(): PlotRequest {
+
+  createPlotConfig(): PlotConfig {
     const aggregates = new Array<string>();
     this.selectedPlotType.forEach(a => aggregates.push(a.id));
     
     const y1 = this.y1AxisDefinitionComponent.getAxisDefinition();
     const y2 = this.y2AxisDefinitionComponent ? this.y2AxisDefinitionComponent.getAxisDefinition() : undefined;
-    const results = document.getElementById("results");
-    
+   
     const config = new PlotConfig(
       this.query.query,
       this.groupBy.map(o => o.name),
@@ -202,6 +201,13 @@ export class VisualizationPageComponent implements OnInit {
       this.intervalValue,
       this.renderBarChartTickLabels, 
     );
+    return config;
+  }
+  
+  createPlotRequest(): PlotRequest {
+     const results = document.getElementById("results");
+    
+    const config = this.createPlotConfig();
 
     const request = new PlotRequest(
       results != null ? results.offsetHeight-1: 1024,