84 lines
2.3 KiB
Go
84 lines
2.3 KiB
Go
package main
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import (
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"net/http"
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"time"
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"git.fireandbrimst.one/aw/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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This is an example of using the `TimeSeries` to automatically coerce time.Time values into a continuous xrange.
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Note: chart.TimeSeries implements `ValueFormatterProvider` and as a result gives the XAxis the appropriate formatter to use for the ticks.
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*/
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graph := chart.Chart{
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XAxis: chart.XAxis{
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Style: chart.StyleShow(),
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},
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Series: []chart.Series{
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chart.TimeSeries{
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XValues: []time.Time{
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time.Now().AddDate(0, 0, -10),
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time.Now().AddDate(0, 0, -9),
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time.Now().AddDate(0, 0, -8),
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time.Now().AddDate(0, 0, -7),
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time.Now().AddDate(0, 0, -6),
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time.Now().AddDate(0, 0, -5),
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time.Now().AddDate(0, 0, -4),
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time.Now().AddDate(0, 0, -3),
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time.Now().AddDate(0, 0, -2),
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time.Now().AddDate(0, 0, -1),
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time.Now(),
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},
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YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 11.0},
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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 drawCustomChart(res http.ResponseWriter, req *http.Request) {
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/*
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This is basically the other timeseries example, except we switch to hour intervals and specify a different formatter from default for the xaxis tick labels.
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*/
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graph := chart.Chart{
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XAxis: chart.XAxis{
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Style: chart.StyleShow(),
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ValueFormatter: chart.TimeHourValueFormatter,
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},
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Series: []chart.Series{
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chart.TimeSeries{
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XValues: []time.Time{
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time.Now().Add(-10 * time.Hour),
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time.Now().Add(-9 * time.Hour),
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time.Now().Add(-8 * time.Hour),
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time.Now().Add(-7 * time.Hour),
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time.Now().Add(-6 * time.Hour),
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time.Now().Add(-5 * time.Hour),
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time.Now().Add(-4 * time.Hour),
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time.Now().Add(-3 * time.Hour),
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time.Now().Add(-2 * time.Hour),
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time.Now().Add(-1 * time.Hour),
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time.Now(),
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},
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YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 11.0},
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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.HandleFunc("/favicon.ico", func(res http.ResponseWriter, req *http.Request) {
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res.Write([]byte{})
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})
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http.HandleFunc("/custom", drawCustomChart)
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http.ListenAndServe(":8080", nil)
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}
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