82 lines
2.3 KiB
Go
82 lines
2.3 KiB
Go
package app
|
|
|
|
import (
|
|
"bytes"
|
|
"io"
|
|
"math/rand"
|
|
|
|
chart "github.com/wcharczuk/go-chart/v2"
|
|
|
|
. "kjol/vdom"
|
|
)
|
|
|
|
var chartLabels = []string{"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"}
|
|
|
|
// fixed initial data so the server SSR and the client's first render match.
|
|
func fixedChartData() []int { return []int{42, 17, 63, 28, 55, 9, 71} }
|
|
|
|
func randomValues() []int {
|
|
v := make([]int, len(chartLabels))
|
|
for i := range v {
|
|
v[i] = rand.Intn(95) + 5
|
|
}
|
|
return v
|
|
}
|
|
|
|
func renderSVG(c interface {
|
|
Render(chart.RendererProvider, io.Writer) error
|
|
}) string {
|
|
var buf bytes.Buffer
|
|
if c.Render(chart.SVG, &buf) != nil {
|
|
return "<p class=\"text-danger m-0\">chart error</p>"
|
|
}
|
|
return buf.String()
|
|
}
|
|
|
|
func barSVG(values []int) string {
|
|
bars := make([]chart.Value, len(values))
|
|
for i, v := range values {
|
|
bars[i] = chart.Value{Value: float64(v), Label: chartLabels[i%len(chartLabels)]}
|
|
}
|
|
return renderSVG(&chart.BarChart{
|
|
Title: "Weekly values (bar)",
|
|
TitleStyle: chart.Style{FontSize: 15},
|
|
Background: chart.Style{Padding: chart.Box{Top: 48, Left: 16, Right: 16, Bottom: 16}},
|
|
Height: 320, BarWidth: 48, Bars: bars,
|
|
})
|
|
}
|
|
|
|
func pieSVG(values []int) string {
|
|
vs := make([]chart.Value, len(values))
|
|
for i, v := range values {
|
|
vs[i] = chart.Value{Value: float64(v), Label: chartLabels[i%len(chartLabels)]}
|
|
}
|
|
return renderSVG(&chart.PieChart{
|
|
Title: "Share by day (pie)",
|
|
TitleStyle: chart.Style{FontSize: 15},
|
|
Background: chart.Style{Padding: chart.Box{Top: 48}},
|
|
Width: 320, Height: 320, Values: vs,
|
|
})
|
|
}
|
|
|
|
//gowasm:page /chart static layout=app
|
|
func ChartPage(d Deps) func() *VNode {
|
|
data := NewSignal(fixedChartData())
|
|
return func() *VNode {
|
|
values := data.Get()
|
|
return Div(
|
|
H2(Attr("class", "h4 mb-3"), Text("Charts — go-chart (SSR + hydrate)")),
|
|
P(Attr("class", "text-secondary"),
|
|
Text("Rendered to SVG on the server, hydrated on the client; Shuffle re-renders client-side.")),
|
|
Button(Attr("class", "btn btn-primary mb-3"),
|
|
On(EVENT_CLICK, func() { data.Set(randomValues()) }), Text("Shuffle Data")),
|
|
Div(Attr("class", "row"),
|
|
Div(Attr("class", "col-12 col-lg-7 mb-3"),
|
|
Div(Attr("class", "border rounded p-2 bg-white overflow-auto"), Raw(barSVG(values)))),
|
|
Div(Attr("class", "col-12 col-lg-5 mb-3"),
|
|
Div(Attr("class", "border rounded p-2 bg-white overflow-auto"), Raw(pieSVG(values)))),
|
|
),
|
|
)
|
|
}
|
|
}
|