check for empty legendEntry param

bitly · Dec 13, 2023 · 54f14a9 · 54f14a9
1 parent 1f82d7d
commit 54f14a9
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Showing 2 changed files with 7 additions and 5 deletions.
diff --git a/README.md b/README.md
@@ -32,7 +32,7 @@ func main() {
     tsi := GoogleCloudMonitoringClient.ListTimeSeries(context.Background(), request)
     
     // Create the plot from the GAPI TimeSeries
-    plot, _ := tsplot.NewPlotFromTimeSeriesIterator(tsi)
+    plot, _ := tsplot.NewPlotFromTimeSeriesIterator(tsi, "", nil)
     
     // Save the new plot to disk.
     plot.Save(8*vg.Inch, 4*vg.Inch, "my_plot.png")

diff --git a/tsplot/plot.go b/tsplot/plot.go
@@ -103,10 +103,12 @@ func NewPlotFromTimeSeriesIterator(tsi *monitoring.TimeSeriesIterator, legendKey
 		applyLine(p)
 
 		// add to legend
-		legendEntry, _ := plotter.NewPolygon()
-		legendEntry.Color = lineColor
-		p.Legend.Left = true
-		p.Legend.Add(timeSeries.GetMetric().GetLabels()[legendKey], legendEntry)
+		if legendKey != "" {
+			legendEntry, _ := plotter.NewPolygon()
+			legendEntry.Color = lineColor
+			p.Legend.Left = true
+			p.Legend.Add(timeSeries.GetMetric().GetLabels()[legendKey], legendEntry)
+		}
 	}
 
 	// set Y Axis scale