40 lines
1002 B
Go
40 lines
1002 B
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 a `Renderable` or a custom component to the `Elements` array.
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In this specific case it is a pre-built renderable (`CreateLegend`) that draws a legend for the chart's series.
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If you like, you can use `CreateLegend` as a template for writing your own renderable, or even your own legend.
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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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Name: "A test series",
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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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//note we have to do this as a separate step because we need a reference to graph
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graph.Elements = []chart.Renderable{
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chart.CreateLegend(&graph),
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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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