go-chart/testserver/main.go

256 lines
5.7 KiB
Go

package main
import (
"bytes"
"fmt"
"log"
"math/rand"
"net/http"
"time"
"github.com/wcharczuk/go-chart"
"github.com/wcharczuk/go-chart/drawing"
"github.com/wcharczuk/go-web"
)
func chartHandler(rc *web.RequestContext) web.ControllerResult {
rnd := rand.New(rand.NewSource(0))
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 s1x []time.Time
for x := 0; x < 100; x++ {
s1x = append([]time.Time{time.Now().AddDate(0, 0, -1*x)}, s1x...)
}
var s1y []float64
for x := 0; x < 100; x++ {
s1y = append(s1y, rnd.Float64()*1024)
}
s1 := chart.TimeSeries{
Name: "a",
XValues: s1x,
YValues: s1y,
Style: chart.Style{
Show: true,
//FillColor: chart.GetDefaultSeriesStrokeColor(0).WithAlpha(64),
},
}
s1lv := chart.AnnotationSeries{
Name: fmt.Sprintf("Last Value"),
Style: chart.Style{
Show: true,
StrokeColor: chart.GetDefaultSeriesStrokeColor(0),
},
Annotations: []chart.Annotation{
{
X: float64(s1x[len(s1x)-1].Unix()),
Y: s1y[len(s1y)-1],
Label: fmt.Sprintf("%s - %s", "test", chart.FloatValueFormatter(s1y[len(s1y)-1])),
},
},
}
s1bb := &chart.BollingerBandsSeries{
Name: "BBS",
Style: chart.Style{
Show: true,
StrokeColor: chart.DefaultAxisColor,
FillColor: chart.DefaultAxisColor.WithAlpha(64),
},
K: 2.0,
WindowSize: 10,
InnerSeries: s1,
}
s1sma := &chart.SimpleMovingAverageSeries{
Style: chart.Style{
Show: true,
StrokeColor: drawing.ColorRed,
StrokeDashArray: []float64{5.0, 5.0},
},
InnerSeries: s1,
}
s1ema := &chart.ExponentialMovingAverageSeries{
Style: chart.Style{
Show: true,
StrokeColor: drawing.ColorBlue,
StrokeDashArray: []float64{5.0, 5.0},
},
InnerSeries: s1,
}
c := chart.Chart{
Title: "A Test Chart",
TitleStyle: chart.Style{
Show: false,
},
Width: 1024,
Height: 400,
XAxis: chart.XAxis{
Style: chart.Style{
Show: true,
},
},
YAxis: chart.YAxis{
Style: chart.Style{
Show: true,
},
Zero: chart.GridLine{
Style: chart.Style{
Show: true,
StrokeWidth: 1.0,
},
},
GridMajorStyle: chart.Style{
Show: false,
},
GridMinorStyle: chart.Style{
Show: true,
},
},
Series: []chart.Series{
s1bb,
s1,
s1lv,
s1sma,
s1ema,
},
}
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
}
func boxHandler(rc *web.RequestContext) web.ControllerResult {
r, err := chart.PNG(1024, 1024)
if err != nil {
rc.API().InternalError(err)
}
f, err := chart.GetDefaultFont()
if err != nil {
return rc.API().InternalError(err)
}
//1:1 128wx128h @ 64,64
a := chart.Box{Top: 64, Left: 64, Right: 192, Bottom: 192}
// 3:2 256x170 @ 16, 16
//b := chart.Box{Top: 16, Left: 16, Right: 256, Bottom: 170}
// 2:3 170x256 @ 16, 16
c := chart.Box{Top: 16, Left: 16, Right: 170, Bottom: 256}
//fitb := a.Fit(b)
fitc := a.Fit(c)
//growb := a.Grow(b)
//growc := a.Grow(c)
//grow := a.Grow(b).Grow(c)
conc := a.Constrain(c)
boxStyle := chart.Style{
StrokeColor: drawing.ColorBlack,
StrokeWidth: 1.0,
Font: f,
FontSize: 18.0,
}
computedBoxStyle := chart.Style{
StrokeColor: drawing.ColorRed,
StrokeWidth: 1.0,
Font: f,
FontSize: 18.0,
}
chart.DrawBox(r, a, boxStyle)
//chart.DrawBox(r, b, boxStyle)
chart.DrawBox(r, c, boxStyle)
//chart.DrawBox(r, fitb, computedBoxStyle)
chart.DrawBox(r, fitc, computedBoxStyle)
/*chart.DrawBox(r, growb, computedBoxStyle)
chart.DrawBox(r, growc, computedBoxStyle)
chart.DrawBox(r, grow, computedBoxStyle)*/
chart.DrawBox(r, conc, computedBoxStyle)
ax, ay := a.Center()
chart.DrawTextCentered(r, "a", ax, ay, boxStyle.WithDefaultsFrom(chart.Style{
FillColor: boxStyle.StrokeColor,
}))
/*bx, by := b.Center()
chart.DrawTextCentered(r, "b", bx, by, boxStyle.WithDefaultsFrom(chart.Style{
FillColor: boxStyle.StrokeColor,
}))*/
cx, cy := c.Center()
chart.DrawTextCentered(r, "c", cx, cy, boxStyle.WithDefaultsFrom(chart.Style{
FillColor: boxStyle.StrokeColor,
}))
/*fbx, fby := fitb.Center()
chart.DrawTextCentered(r, "a fit b", fbx, fby, computedBoxStyle.WithDefaultsFrom(chart.Style{
FillColor: computedBoxStyle.StrokeColor,
}))*/
fcx, fcy := fitc.Center()
chart.DrawTextCentered(r, "a fit c", fcx, fcy, computedBoxStyle.WithDefaultsFrom(chart.Style{
FillColor: computedBoxStyle.StrokeColor,
}))
/*gbx, gby := growb.Center()
chart.DrawTextCentered(r, "a grow b", gbx, gby, computedBoxStyle.WithDefaultsFrom(chart.Style{
FillColor: computedBoxStyle.StrokeColor,
}))
gcx, gcy := growc.Center()
chart.DrawTextCentered(r, "a grow c", gcx, gcy, computedBoxStyle.WithDefaultsFrom(chart.Style{
FillColor: computedBoxStyle.StrokeColor,
}))*/
ccx, ccy := conc.Center()
chart.DrawTextCentered(r, "a const c", ccx, ccy, computedBoxStyle.WithDefaultsFrom(chart.Style{
FillColor: computedBoxStyle.StrokeColor,
}))
rc.Response.Header().Set("Content-Type", "image/png")
buffer := bytes.NewBuffer([]byte{})
err = r.Save(buffer)
if err != nil {
return rc.API().InternalError(err)
}
return rc.Raw(buffer.Bytes())
}
func main() {
app := web.New()
app.SetName("Chart Test Server")
app.SetLogger(web.NewStandardOutputLogger())
app.GET("/", chartHandler)
app.GET("/format/:format", chartHandler)
app.GET("/favico.ico", func(rc *web.RequestContext) web.ControllerResult {
return rc.Raw([]byte{})
})
app.GET("/box", boxHandler)
log.Fatal(app.Start())
}