42 lines
1,001 B
Go
42 lines
1,001 B
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 use a custom `ValueFormatter` for the y axis, letting us specify how to format text of the y-axis ticks.
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You can also do this for the x-axis, or the secondary y-axis.
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This example also shows what the chart looks like with the x-axis left off or not shown.
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*/
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graph := chart.Chart{
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YAxis: chart.YAxis{
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Style: chart.StyleShow(),
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ValueFormatter: func(v interface{}) string {
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if vf, isFloat := v.(float64); isFloat {
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return fmt.Sprintf("%0.6f", vf)
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}
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return ""
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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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},
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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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