47 lines
1.3 KiB
Go
47 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 an `Annotation` series, which is a special type of series that
|
|
draws annotation labels at given X and Y values (as translated by their respective ranges).
|
|
|
|
It is important to not that the chart automatically sizes the canvas box to fit the annotations,
|
|
As well as automatically assign a series color for the `Stroke` or border component of the series.
|
|
|
|
The annotation series is most often used by the original author to show the last value of another series, but
|
|
they can be used in other capacities as well.
|
|
*/
|
|
|
|
graph := chart.Chart{
|
|
Series: []chart.Series{
|
|
chart.ContinuousSeries{
|
|
XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
|
|
YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
|
|
},
|
|
chart.AnnotationSeries{
|
|
Annotations: []chart.Annotation{
|
|
{X: 1.0, Y: 1.0, Label: "One"},
|
|
{X: 2.0, Y: 2.0, Label: "Two"},
|
|
{X: 3.0, Y: 3.0, Label: "Three"},
|
|
{X: 4.0, Y: 4.0, Label: "Four"},
|
|
{X: 5.0, Y: 5.0, Label: "Five"},
|
|
},
|
|
},
|
|
},
|
|
}
|
|
|
|
res.Header().Set("Content-Type", "image/png")
|
|
graph.Render(chart.PNG, res)
|
|
}
|
|
|
|
func main() {
|
|
http.HandleFunc("/", drawChart)
|
|
http.ListenAndServe(":8080", nil)
|
|
}
|