94 lines
2.1 KiB
Go
94 lines
2.1 KiB
Go
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 set a rotation on the style for the custom ticks from the `custom_ticks` example.
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*/
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graph := chart.Chart{
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YAxis: chart.YAxis{
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Style: chart.Style{
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Show: true,
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},
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Range: &chart.ContinuousRange{
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Min: 0.0,
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Max: 4.0,
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},
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TickStyle: chart.Style{
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TextRotationDegrees: 45.0,
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},
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Ticks: []chart.Tick{
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{Value: 0.0, Label: "0.00"},
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{Value: 2.0, Label: "2.00"},
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{Value: 4.0, Label: "4.00"},
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{Value: 6.0, Label: "6.00"},
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{Value: 8.0, Label: "Eight"},
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{Value: 10.0, Label: "Ten"},
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},
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},
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XAxis: chart.XAxis{
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Style: chart.Style{
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Show: true,
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},
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TickStyle: chart.Style{
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TextRotationDegrees: 45.0,
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},
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Ticks: []chart.Tick{
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{Value: 0.0, Label: "0.00"},
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{Value: 2.0, Label: "2.00"},
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{Value: 4.0, Label: "4.00"},
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{Value: 6.0, Label: "6.00"},
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{Value: 8.0, Label: "Eight"},
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{Value: 10.0, Label: "Ten"},
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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.Elements = []chart.Renderable{
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func(r chart.Renderer, cb chart.Box, defaults chart.Style) {
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b := chart.Box{Top: 50, Left: 50, Right: 150, Bottom: 300}
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cx, cy := b.Center()
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chart.Draw.Box(r, chart.Box{Top: cy - 2, Left: cx - 2, Right: cx + 2, Bottom: cy + 2}, chart.Style{
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StrokeWidth: 2,
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StrokeColor: chart.ColorBlack,
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})
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chart.Draw.Box(r, b, chart.Style{
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StrokeWidth: 2,
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StrokeColor: chart.ColorBlue,
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})
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chart.Draw.Box(r, b.BoundedRotate(chart.Math.DegreesToRadians(45)), chart.Style{
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StrokeWidth: 2,
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StrokeColor: chart.ColorRed,
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})
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chart.Draw.BoxRotated(r, b, chart.Math.DegreesToRadians(45), chart.Style{
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StrokeWidth: 2,
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StrokeColor: chart.ColorOrange,
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})
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},
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}
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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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