calendarheatmap/README.md

Self-contained, plain Go implementation of calendar heatmap inspired by Github contribution activity.

Basic

Colorscales

Without month separator

Without labels

Without labels, without separator

Example module, save output in formats supported by image module (PNG, JPEG, GIF).

countByDayOfYear := map[int]int{
    1: 10,
    22: 15,
    150: 22,
    366: 55,
    ...
}

img := charts.NewHeatmap(charts.HeatmapConfig{
    Year:               2020,
    CountByDay:         countByDay,
    ColorScale:         colorscales.PuBu9,
    DrawMonthSeparator: true,
    DrawLabels:         true,
    ...
})

Example script, output as PNG.

go run main.go -h

TODO:

• SVG support
• select start and end date
• JPEG, GIF in script output
• CSV, JSON in script input