go-chart/_examples/twoaxis/main.go

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package main
import (
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"fmt"
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"net/http"
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"git.gutmet.org/go-chart.git"
util "git.gutmet.org/go-chart.git/util"
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)
func drawChart(res http.ResponseWriter, req *http.Request) {
/*
In this example we add a second series, and assign it to the secondary y axis, giving that series it's own range.
We also enable all of the axes by setting the `Show` propery of their respective styles to `true`.
*/
graph := chart.Chart{
XAxis: chart.XAxis{
Style: chart.StyleShow(), //enables / displays the x-axis
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TickPosition: chart.TickPositionBetweenTicks,
ValueFormatter: func(v interface{}) string {
typed := v.(float64)
typedDate := util.Time.FromFloat64(typed)
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return fmt.Sprintf("%d-%d\n%d", typedDate.Month(), typedDate.Day(), typedDate.Year())
},
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},
YAxis: chart.YAxis{
Style: chart.StyleShow(), //enables / displays the y-axis
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},
YAxisSecondary: chart.YAxis{
Style: chart.StyleShow(), //enables / displays the secondary y-axis
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},
Series: []chart.Series{
chart.ContinuousSeries{
XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
},
chart.ContinuousSeries{
YAxis: chart.YAxisSecondary,
XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
YValues: []float64{50.0, 40.0, 30.0, 20.0, 10.0},
},
},
}
res.Header().Set("Content-Type", "image/png")
graph.Render(chart.PNG, res)
}
func main() {
http.HandleFunc("/", drawChart)
http.ListenAndServe(":8080", nil)
}