update readme

README.md

@@ -2,11 +2,6 @@
 [![Go Report Card](https://goreportcard.com/badge/github.com/bitly/tsplot)](https://goreportcard.com/report/github.com/bitly/tsplot)
 [![Go Reference](https://pkg.go.dev/badge/github.com/bitly/tsplot.svg)](https://pkg.go.dev/github.com/bitly/tsplot)
 
-This package provides a method of querying for raw time series data from the GCM APIs and additionally plotting that data for use in other applications.
-
-This came to be due to what we consider a small limitation in the Google APIs which require us to re-draw graphs to include them in other applications such as
-Slack bots. There is no facility in the Google API that provides a PNG of already graphed data.
-
 ## Authentication
 This package makes no effort to assist in authentication to the Google APIs.
 Instead, it will expect the caller to supply an authenticated client.
@@ -16,60 +11,31 @@ More information on authentication can be found in the official [Google Cloud do
 func main() {
 
     ... snip ...
-    
+
     start := time.Now().Add(-1 * time.Hour)
     end := time.Now()
-    
-    // create new request
-	request := tsplot.GCMTimeSeriesRequester{ListTimeSeriesRequest: monitoringpb.ListTimeSeriesRequest{
-		Name:   fmt.Sprintf("projects/%s", project),
-		Filter: query,
-		Interval: &monitoringpb.TimeInterval{
-			EndTime:   timestamppb.New(et),
-			StartTime: timestamppb.New(st),
-		},
-		Aggregation:          nil,
-		SecondaryAggregation: nil,
-		View:                 monitoringpb.ListTimeSeriesRequest_FULL,
-	}}
-
-    // disable cross series reducer (MEAN reduction is default)
-    request.Set_REDUCE_NONE()
-
-    // set different alignment window. (Default is 1 minute)
-    request.SetAlignmentPeriod(time.Minute * 5)
-
-    tsi := request.Do(client) // client is provided by user
-}
-```
 
-## Plotting
-To plot the data, tsplot leverages the open source package [gonum/plot](github.com/gonum/plot) to create a graph and plot the data for a given time series.
-
-The example below creates a new graph containing a singular time series, plots it, and saves the resulting plot to disk.
-```
-func main() {
-
-    ... snip ...
-
-    ts := tsplot.TimeSeries{}
+    // create new request
+    request := monitoringpb.ListTimeSeriesRequest{
+	Name:   fmt.Sprintf("projects/%s", project),
+	Filter: query,
+	Interval: &monitoringpb.TimeInterval{
+	    EndTime:   timestamppb.New(et),
+	    StartTime: timestamppb.New(st),
+	},
+	Aggregation:          nil,
+	SecondaryAggregation: nil,
+	View:                 monitoringpb.ListTimeSeriesRequest_FULL,
+    }
 
-    // optionally iterate over returned time series
-    timeSeries, _ := tsi.Next()
-    ts[metric] = ts.GetPoints()
+    // execute the request and get the response from Google APIs
+    tsi := GoogleCloudMonitoringClient.ListTimeSeries(context.Background(), request)
 
-    // create the plot with some formatting options
-    p, err := ts.Plot([]tsplot.PlotOption{
-      tsplot.WithXAxisName("UTC"),
-      tsplot.WIthGrid(colornames.Darkgrey),
-      tsplot.WithTitle(metric)}...)
-    
-    if err != nil {
-      return err
-    }
+    // Create the plot from the GAPI TimeSeries
+    plot, _ := tsplot.NewPlotFromTimeSeriesIterator(tsi)
 
-    // optionally save the plot to disk
-    p.Save(8*vg.Inch, 4*vg.Inch, "./my-graph.png")
+    // Save the new plot to disk.
+    plot.Save(8*vg.Inch, 4*vg.Inch, "my_plot.png")
 }
 ```