42 lines
1.3 KiB
Go
42 lines
1.3 KiB
Go
package main
|
|
|
|
import (
|
|
"net/http"
|
|
|
|
"github.com/wcharczuk/go-chart"
|
|
)
|
|
|
|
func drawChart(res http.ResponseWriter, req *http.Request) {
|
|
|
|
/*
|
|
In this example we add a new type of series, a `SimpleMovingAverageSeries` that takes another series as a required argument.
|
|
InnerSeries only needs to implement `ValueProvider`, so really you could chain `SimpleMovingAverageSeries` together if you wanted.
|
|
*/
|
|
|
|
mainSeries := chart.ContinuousSeries{
|
|
Name: "A test series",
|
|
XValues: chart.Sequence.Float64(1.0, 100.0), //generates a []float64 from 1.0 to 100.0 in 1.0 step increments, or 100 elements.
|
|
YValues: chart.Sequence.Random(100, 100), //generates a []float64 randomly from 0 to 100 with 100 elements.
|
|
}
|
|
|
|
// note we create a SimpleMovingAverage series by assignin the inner series.
|
|
// we need to use a reference because `.Render()` needs to modify state within the series.
|
|
smaSeries := &chart.SMASeries{
|
|
InnerSeries: mainSeries,
|
|
} // we can optionally set the `WindowSize` property which alters how the moving average is calculated.
|
|
|
|
graph := chart.Chart{
|
|
Series: []chart.Series{
|
|
mainSeries,
|
|
smaSeries,
|
|
},
|
|
}
|
|
|
|
res.Header().Set("Content-Type", "image/png")
|
|
graph.Render(chart.PNG, res)
|
|
}
|
|
|
|
func main() {
|
|
http.HandleFunc("/", drawChart)
|
|
http.ListenAndServe(":8080", nil)
|
|
}
|