158 lines
3.4 KiB
Go
158 lines
3.4 KiB
Go
package main
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import (
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"encoding/json"
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"fmt"
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"math/rand"
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"time"
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"github.com/go-via/via"
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"github.com/go-via/via/h"
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)
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func main() {
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v := via.New()
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v.Config(via.Options{
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DocumentTitle: "Via",
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DocumentHeadIncludes: []h.H{
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h.Link(h.Rel("stylesheet"), h.Href("https://cdn.jsdelivr.net/npm/@picocss/pico@2/css/pico.min.css")),
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h.Script(h.Src("https://unpkg.com/echarts@6.0.0/dist/echarts.min.js")),
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},
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})
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v.Page("/", func(c *via.Context) {
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chartComp := c.Component(chartCompFn)
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c.View(func() h.H {
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return h.Div(h.Class("container"),
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chartComp(),
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)
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})
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})
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v.Start(":3000")
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}
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func chartCompFn(c *via.Context) {
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data := make([]float64, 1000)
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labels := make([]string, 1000)
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isLive := false
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refreshRate := c.Signal(1)
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tkr := time.NewTicker(1000 * time.Millisecond)
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updateRefreshRate := c.Action(func() {
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tkr.Reset(1000 / time.Duration(refreshRate.Int()) * time.Millisecond)
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})
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toggleIsLive := c.Action(func() {
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isLive = !isLive
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})
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go func() {
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defer tkr.Stop()
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for range tkr.C {
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labels = append(labels[1:], time.Now().Format("15:04:05.000"))
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data = append(data[1:], rand.Float64()*10)
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labelsTxt, _ := json.Marshal(labels)
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dataTxt, _ := json.Marshal(data)
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if isLive {
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c.ExecScript(fmt.Sprintf(`
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if (myChart)
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myChart.setOption({
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xAxis: [{data: %s}],
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series:[{data: %s}]
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},{notMerge:false,lazyUpdate:true});
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`, labelsTxt, dataTxt))
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}
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}
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}()
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c.View(func() h.H {
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return h.Div(
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h.Div(h.ID("chart"), h.Style("width:100%;height:400px;"),
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h.Script(h.Raw(`
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const prefersDark = window.matchMedia('(prefers-color-scheme: dark)');
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var myChart = echarts.init(document.getElementById('chart'), prefersDark.matches ? 'dark' : 'light');
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var option = {
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backgroundColor: prefersDark.matches ? 'transparent' : '#ffffff',
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animationDurationUpdate: 0, // affects updates/redraws
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tooltip: {
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trigger: 'axis',
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position: function (pt) {
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return [pt[0], '10%'];
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}
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},
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title: {
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left: 'center',
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text: 'Large Area Chart'
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},
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xAxis: {
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type: 'category',
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boundaryGap: false,
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data: []
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},
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yAxis: {
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type: 'value',
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boundaryGap: [0, '100%']
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},
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dataZoom: [
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{
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type: 'inside',
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start: 80,
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end: 100
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},
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{
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start: 0,
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end: 100
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}
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],
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series: [
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{
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name: 'Fake Data',
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type: 'line',
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symbol: 'none',
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sampling: 'lttb',
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itemStyle: {
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color: '#1488CC'
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},
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areaStyle: {
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color: new echarts.graphic.LinearGradient(0, 0, 0, 1, [
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{
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offset: 0,
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color: '#1488CC'
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},
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{
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offset: 1,
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color: '#2B32B2'
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}
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])
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},
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data: []
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}
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]
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};
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option && myChart.setOption(option);
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`)),
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h.Section(
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h.Article(
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h.H5(h.Text("Controls")),
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h.Hr(),
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h.Div(h.Class("grid"),
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h.FieldSet(
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h.Legend(h.Text("Live Data")),
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h.Input(h.Type("checkbox"), h.Role("switch"), toggleIsLive.OnChange()),
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),
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h.Label(h.ID("refresh-rate-input"), h.Span(h.Text("Refresh Rate (")), h.Span(refreshRate.Text()), h.Span(h.Text(" Hz)")),
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h.Input(h.Type("range"), h.Attr("min", "1"), h.Attr("max", "200"), refreshRate.Bind(), updateRefreshRate.OnChange()),
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),
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),
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),
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),
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),
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)
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})
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}
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