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main.go
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main.go
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package main
import (
"net/http"
"github.com/wcharczuk/go-chart"
"github.com/wcharczuk/go-chart/drawing"
)
func drawChart(res http.ResponseWriter, req *http.Request) {
/*
In this example we set some custom colors for the series and the chart background and canvas.
*/
graph := chart.Chart{
Background: chart.Style{
FillColor: drawing.ColorBlue,
},
Canvas: chart.Style{
FillColor: drawing.ColorFromHex("efefef"),
},
Series: []chart.Series{
chart.ContinuousSeries{
Style: chart.Style{
Show: true, //note; if we set ANY other properties, we must set this to true.
StrokeColor: drawing.ColorRed, // will supercede defaults
FillColor: drawing.ColorRed.WithAlpha(64), // will supercede defaults
},
XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
},
},
}
res.Header().Set("Content-Type", "image/png")
graph.Render(chart.PNG, res)
}
func main() {
http.HandleFunc("/", drawChart)
http.ListenAndServe(":8080", nil)
}