88 lines
2 KiB
Go
88 lines
2 KiB
Go
package main
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import (
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"fmt"
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"log"
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"net/http"
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"os"
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chart "github.com/wcharczuk/go-chart"
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"github.com/wcharczuk/go-chart/drawing"
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)
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func drawChart(res http.ResponseWriter, req *http.Request) {
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profitStyle := chart.Style{
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Show: true,
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FillColor: drawing.ColorFromHex("13c158"),
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StrokeColor: drawing.ColorFromHex("13c158"),
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StrokeWidth: 0,
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}
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lossStyle := chart.Style{
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Show: true,
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FillColor: drawing.ColorFromHex("c11313"),
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StrokeColor: drawing.ColorFromHex("c11313"),
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StrokeWidth: 0,
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}
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sbc := chart.BarChart{
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Title: "Bar Chart Using BaseValue",
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TitleStyle: chart.StyleShow(),
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Background: chart.Style{
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Padding: chart.Box{
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Top: 40,
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},
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},
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Height: 512,
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BarWidth: 60,
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XAxis: chart.Style{
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Show: true,
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},
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YAxis: chart.YAxis{
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Style: chart.Style{
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Show: true,
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},
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Ticks: []chart.Tick{
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{Value: -4.0, Label: "-4"},
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{Value: -2.0, Label: "-2"},
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{Value: 0, Label: "0"},
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{Value: 2.0, Label: "2"},
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{Value: 4.0, Label: "4"},
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{Value: 6.0, Label: "6"},
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{Value: 8.0, Label: "8"},
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{Value: 10.0, Label: "10"},
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{Value: 12.0, Label: "12"},
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},
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},
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UseBaseValue: true,
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BaseValue: 0.0,
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Bars: []chart.Value{
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{Value: 10.0, Style: profitStyle, Label: "Profit"},
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{Value: 12.0, Style: profitStyle, Label: "More Profit"},
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{Value: 8.0, Style: profitStyle, Label: "Still Profit"},
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{Value: -4.0, Style: lossStyle, Label: "Loss!"},
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{Value: 3.0, Style: profitStyle, Label: "Phew Ok"},
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{Value: -2.0, Style: lossStyle, Label: "Oh No!"},
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},
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}
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res.Header().Set("Content-Type", "image/png")
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err := sbc.Render(chart.PNG, res)
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if err != nil {
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fmt.Printf("Error rendering chart: %v\n", err)
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}
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}
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func port() string {
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if len(os.Getenv("PORT")) > 0 {
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return os.Getenv("PORT")
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}
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return "8080"
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}
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func main() {
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listenPort := fmt.Sprintf(":%s", port())
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fmt.Printf("Listening on %s\n", listenPort)
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http.HandleFunc("/", drawChart)
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log.Fatal(http.ListenAndServe(listenPort, nil))
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}
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