81 lines
1.6 KiB
Go
81 lines
1.6 KiB
Go
package main
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import (
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"crypto/rand"
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"fmt"
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"math/big"
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"os"
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"path/filepath"
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"time"
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"git.smarteching.com/zeni/go-charts/v2"
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)
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func writeFile(buf []byte) error {
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tmpPath := "./tmp"
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err := os.MkdirAll(tmpPath, 0700)
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if err != nil {
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return err
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}
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file := filepath.Join(tmpPath, "time-line-chart.png")
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err = os.WriteFile(file, buf, 0600)
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if err != nil {
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return err
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}
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return nil
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}
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func main() {
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xAxisValue := []string{}
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values := []float64{}
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now := time.Now()
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firstAxis := 0
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for i := 0; i < 300; i++ {
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// 设置首个axis为xx:00的时间点
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if firstAxis == 0 && now.Minute() == 0 {
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firstAxis = i
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}
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xAxisValue = append(xAxisValue, now.Format("15:04"))
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now = now.Add(time.Minute)
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value, _ := rand.Int(rand.Reader, big.NewInt(100))
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values = append(values, float64(value.Int64()))
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}
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p, err := charts.LineRender(
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[][]float64{
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values,
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},
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charts.TitleTextOptionFunc("Line"),
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charts.XAxisDataOptionFunc(xAxisValue, charts.FalseFlag()),
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charts.LegendLabelsOptionFunc([]string{
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"Demo",
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}, "50"),
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func(opt *charts.ChartOption) {
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opt.XAxis.FirstAxis = firstAxis
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// 必须要比计算得来的最小值更大(每60分钟)
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opt.XAxis.SplitNumber = 60
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opt.Legend.Padding = charts.Box{
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Top: 5,
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Bottom: 10,
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}
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opt.SymbolShow = charts.FalseFlag()
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opt.LineStrokeWidth = 1
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opt.ValueFormatter = func(f float64) string {
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return fmt.Sprintf("%.0f", f)
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}
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},
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)
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if err != nil {
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panic(err)
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}
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buf, err := p.Bytes()
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if err != nil {
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panic(err)
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}
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err = writeFile(buf)
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if err != nil {
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panic(err)
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}
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}
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