126 lines
2.5 KiB
Go
126 lines
2.5 KiB
Go
package main
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import (
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"log"
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"net/http"
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"github.com/wcharczuk/go-chart"
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"github.com/wcharczuk/go-web"
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)
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func chartHandler(rc *web.RequestContext) web.ControllerResult {
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format, err := rc.RouteParameter("format")
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if err != nil {
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format = "png"
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}
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if format == "png" {
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rc.Response.Header().Set("Content-Type", "image/png")
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} else {
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rc.Response.Header().Set("Content-Type", "image/svg+xml")
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}
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s1x := []float64{2.0, 3.0, 4.0, 5.0}
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s1y := []float64{2.5, 5.0, 2.0, 3.3}
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s2x := []float64{0.0, 0.5, 1.0, 1.5}
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s2y := []float64{1.1, 1.2, 1.0, 1.3}
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c := chart.Chart{
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Title: "A Test Chart",
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TitleStyle: chart.Style{
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Show: true,
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},
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Width: 1024,
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Height: 400,
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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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},
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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.Range{
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Min: 0.0,
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Max: 7.0,
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},
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},
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YAxisSecondary: 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.Range{
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Min: 0.8,
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Max: 1.5,
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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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Name: "a",
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XValues: s1x,
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YValues: s1y,
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},
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chart.ContinuousSeries{
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Name: "b",
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YAxis: chart.YAxisSecondary,
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XValues: s2x,
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YValues: s2y,
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},
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chart.AnnotationSeries{
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Name: "a - last value",
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Style: chart.Style{
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Show: true,
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StrokeColor: chart.GetDefaultSeriesStrokeColor(0),
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},
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Annotations: []chart.Annotation{
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chart.Annotation{
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X: s1x[len(s1x)-1],
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Y: s1y[len(s1y)-1],
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Label: chart.FloatValueFormatter(s1y[len(s1y)-1]),
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},
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},
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},
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chart.AnnotationSeries{
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Name: "b - last value",
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YAxis: chart.YAxisSecondary,
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Style: chart.Style{
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Show: true,
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StrokeColor: chart.GetDefaultSeriesStrokeColor(1),
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},
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Annotations: []chart.Annotation{
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chart.Annotation{
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X: s2x[len(s2x)-1],
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Y: s2y[len(s2y)-1],
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Label: chart.FloatValueFormatter(s2y[len(s2y)-1]),
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},
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},
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},
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},
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}
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if format == "png" {
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err = c.Render(chart.PNG, rc.Response)
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} else {
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err = c.Render(chart.SVG, rc.Response)
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}
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if err != nil {
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return rc.API().InternalError(err)
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}
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rc.Response.WriteHeader(http.StatusOK)
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return nil
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}
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func main() {
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app := web.New()
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app.SetName("Chart Test Server")
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app.SetLogger(web.NewStandardOutputLogger())
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app.GET("/", chartHandler)
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app.GET("/format/:format", chartHandler)
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app.GET("/favico.ico", func(rc *web.RequestContext) web.ControllerResult {
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return rc.Raw([]byte{})
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})
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log.Fatal(app.Start())
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}
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