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