127 lines
2 KiB
Go
127 lines
2 KiB
Go
package main
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import (
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"io/ioutil"
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"os"
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"path/filepath"
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"github.com/vicanso/go-charts"
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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, "bar-chart.png")
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err = ioutil.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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p, err := charts.NewPainter(charts.PainterOptions{
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Width: 800,
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Height: 600,
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Type: charts.ChartOutputPNG,
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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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_, err = charts.NewBarChart(p, charts.BarChartOption{
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Title: charts.TitleOption{
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Text: "Rainfall vs Evaporation",
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Subtext: "Fake Data",
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},
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Padding: charts.Box{
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Top: 20,
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Right: 20,
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Bottom: 20,
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Left: 20,
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},
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XAxis: charts.NewXAxisOption([]string{
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"Jan",
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"Feb",
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"Mar",
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"Apr",
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"May",
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"Jun",
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"Jul",
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"Aug",
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"Sep",
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"Oct",
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"Nov",
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"Dec",
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}),
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Legend: charts.NewLegendOption([]string{
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"Rainfall",
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"Evaporation",
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}, charts.PositionRight),
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SeriesList: []charts.Series{
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{
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Type: charts.ChartTypeBar,
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Data: charts.NewSeriesDataFromValues([]float64{
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2.0,
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4.9,
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7.0,
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23.2,
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25.6,
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76.7,
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135.6,
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162.2,
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32.6,
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20.0,
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6.4,
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3.3,
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}),
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MarkPoint: charts.NewMarkPoint(
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charts.SeriesMarkDataTypeMax,
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charts.SeriesMarkDataTypeMin,
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),
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MarkLine: charts.NewMarkLine(
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charts.SeriesMarkDataTypeAverage,
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),
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},
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{
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Type: charts.ChartTypeBar,
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Data: charts.NewSeriesDataFromValues([]float64{
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2.6,
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5.9,
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9.0,
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26.4,
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28.7,
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70.7,
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175.6,
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182.2,
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48.7,
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18.8,
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6.0,
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2.3,
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}),
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MarkPoint: charts.NewMarkPoint(
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charts.SeriesMarkDataTypeMax,
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charts.SeriesMarkDataTypeMin,
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),
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MarkLine: charts.NewMarkLine(
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charts.SeriesMarkDataTypeAverage,
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),
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},
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},
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}).Render()
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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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