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This commit is contained in:
Will Charczuk 2016-08-07 10:51:06 -07:00
parent 63a26acadd
commit c19111629c
3 changed files with 284 additions and 1 deletions
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2
README.md
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go-chart
========
[![Build Status](https://travis-ci.org/wcharczuk/go-chart.svg?branch=master)](https://travis-ci.org/wcharczuk/go-chart)
[![Build Status](https://travis-ci.org/wcharczuk/go-chart.svg?branch=master)](https://travis-ci.org/wcharczuk/go-chart)[![Go Report Card](https://goreportcard.com/badge/github.com/wcharczuk/go-chart)](https://goreportcard.com/report/github.com/wcharczuk/go-chart)
Package `chart` is a very simple golang native charting library that supports timeseries and continuous
line charts.

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_examples/request_timings/main.go Normal file
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package main
import (
"net/http"
"strings"
"time"
util "github.com/blendlabs/go-util"
"github.com/wcharczuk/go-chart"
)
func readData() ([]time.Time, []float64) {
var xvalues []time.Time
var yvalues []float64
util.ReadFileByLines("requests.csv", func(line string) {
parts := strings.Split(line, ",")
year := util.ParseInt(parts[0])
month := util.ParseInt(parts[1])
day := util.ParseInt(parts[2])
hour := util.ParseInt(parts[3])
elapsedMillis := util.ParseFloat64(parts[4])
xvalues = append(xvalues, time.Date(year, time.Month(month), day, hour, 0, 0, 0, time.UTC))
yvalues = append(yvalues, elapsedMillis)
})
return xvalues, yvalues
}
func drawChart(res http.ResponseWriter, req *http.Request) {
xvalues, yvalues := readData()
mainSeries := chart.TimeSeries{
Name: "Prod Request Timings",
Style: chart.Style{
Show: true,
StrokeColor: chart.ColorBlue,
FillColor: chart.ColorBlue.WithAlpha(100),
},
XValues: xvalues,
YValues: yvalues,
}
minSeries := &chart.MinSeries{
Style: chart.Style{
Show: true,
StrokeColor: chart.ColorAlternateGray,
StrokeDashArray: []float64{5.0, 5.0},
},
InnerSeries: mainSeries,
}
maxSeries := &chart.MaxSeries{
Style: chart.Style{
Show: true,
StrokeColor: chart.ColorAlternateGray,
StrokeDashArray: []float64{5.0, 5.0},
},
InnerSeries: mainSeries,
}
linreg := &chart.LinearRegressionSeries{
Name: "Linear Regression",
Style: chart.Style{
Show: true,
StrokeColor: chart.ColorAlternateBlue,
StrokeDashArray: []float64{5.0, 5.0},
},
InnerSeries: mainSeries,
}
sma := &chart.SMASeries{
Name: "SMA",
Style: chart.Style{
Show: true,
StrokeColor: chart.ColorRed,
StrokeDashArray: []float64{5.0, 5.0},
},
InnerSeries: mainSeries,
}
graph := chart.Chart{
Width: 1280,
Height: 720,
YAxis: chart.YAxis{
Name: "Elapsed Millis",
NameStyle: chart.StyleShow(),
Style: chart.StyleShow(),
},
XAxis: chart.XAxis{
Style: chart.StyleShow(),
ValueFormatter: chart.TimeHourValueFormatter,
},
Series: []chart.Series{
mainSeries,
minSeries,
maxSeries,
chart.LastValueAnnotation(minSeries),
chart.LastValueAnnotation(maxSeries),
linreg,
chart.LastValueAnnotation(linreg),
sma,
chart.LastValueAnnotation(sma),
},
}
graph.Elements = []chart.Renderable{chart.Legend(&graph)}
res.Header().Set("Content-Type", "image/png")
graph.Render(chart.PNG, res)
}
func main() {
http.HandleFunc("/", drawChart)
http.ListenAndServe(":8080", nil)
}

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