48 lines
1.3 KiB
Go
48 lines
1.3 KiB
Go
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package main
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import (
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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 an `Annotation` series, which is a special type of series that
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draws annotation labels at given X and Y values (as translated by their respective ranges).
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It is important to not that the chart automatically sizes the canvas box to fit the annotations,
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As well as automatically assign a series color for the `Stroke` or border component of the series.
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The annotation series is most often used by the original author to show the last value of another series, but
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they can be used in other capacities as well.
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*/
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graph := chart.Chart{
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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.AnnotationSeries{
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Annotations: []chart.Annotation{
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{X: 1.0, Y: 1.0, Label: "One"},
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{X: 2.0, Y: 2.0, Label: "Two"},
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{X: 3.0, Y: 3.0, Label: "Three"},
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{X: 4.0, Y: 4.0, Label: "Four"},
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{X: 5.0, Y: 5.0, Label: "Five"},
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},
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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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