go-chart/testserver/main.go

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package main
import (
"log"
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"net/http"
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"github.com/wcharczuk/go-chart"
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"github.com/wcharczuk/go-chart/drawing"
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"github.com/wcharczuk/go-web"
)
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func chartHandler(rc *web.RequestContext) web.ControllerResult {
format, err := rc.RouteParameter("format")
if err != nil {
format = "png"
}
if format == "png" {
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rc.Response.Header().Set("Content-Type", "image/png")
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} else {
rc.Response.Header().Set("Content-Type", "image/svg+xml")
}
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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}
s2y := []float64{1.1, 1.2, 1.0, 1.3}
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c := chart.Chart{
Title: "A Test Chart",
TitleStyle: chart.Style{
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Show: true,
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},
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Width: 1024,
Height: 400,
XAxis: chart.XAxis{
Style: chart.Style{
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Show: true,
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},
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},
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YAxis: chart.YAxis{
Style: chart.Style{
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Show: true,
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},
Range: chart.Range{
Min: 0.0,
Max: 7.0,
},
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},
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YAxisSecondary: chart.YAxis{
Style: chart.Style{
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Show: true,
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},
Range: chart.Range{
Min: 0.8,
Max: 1.5,
},
},
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Series: []chart.Series{
chart.ContinuousSeries{
Name: "a",
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XValues: s1x,
YValues: s1y,
},
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chart.ContinuousSeries{
Name: "b",
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YAxis: chart.YAxisSecondary,
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XValues: s2x,
YValues: s2y,
},
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},
}
if format == "png" {
err = c.Render(chart.PNG, rc.Response)
} else {
err = c.Render(chart.SVG, rc.Response)
}
if err != nil {
return rc.API().InternalError(err)
}
rc.Response.WriteHeader(http.StatusOK)
return nil
}
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func measureTestHandler(rc *web.RequestContext) web.ControllerResult {
format, err := rc.RouteParameter("format")
if err != nil {
format = "png"
}
if format == "png" {
rc.Response.Header().Set("Content-Type", "image/png")
} else {
rc.Response.Header().Set("Content-Type", "image/svg+xml")
}
var r chart.Renderer
if format == "png" {
r, err = chart.PNG(512, 512)
} else {
r, err = chart.SVG(512, 512)
}
if err != nil {
return rc.API().InternalError(err)
}
f, err := chart.GetDefaultFont()
if err != nil {
return rc.API().InternalError(err)
}
r.SetDPI(96)
r.SetFont(f)
r.SetFontSize(24.0)
r.SetFontColor(drawing.ColorBlack)
r.SetStrokeColor(drawing.ColorBlack)
tx, ty := 64, 64
tw, th := r.MeasureText("test")
r.MoveTo(tx, ty)
r.LineTo(tx+tw, ty)
r.LineTo(tx+tw, ty-th)
r.LineTo(tx, ty-th)
r.LineTo(tx, ty)
r.Stroke()
r.Text("test", tx, ty)
r.Save(rc.Response)
return nil
}
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func main() {
app := web.New()
app.SetName("Chart Test Server")
app.SetLogger(web.NewStandardOutputLogger())
app.GET("/", chartHandler)
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app.GET("/format/:format", chartHandler)
app.GET("/favico.ico", func(rc *web.RequestContext) web.ControllerResult {
return rc.Raw([]byte{})
})
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app.GET("/measure", measureTestHandler)
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log.Fatal(app.Start())
}