mirror of
https://github.com/prymitive/karma
synced 2026-05-07 03:26:52 +00:00
090d73350c
Right now backend sends both background and font color information, refactor to send background color and background brightness level (needed to pick font color) and let UI apply font color. Needed to implement #18
65 lines
1.8 KiB
Go
65 lines
1.8 KiB
Go
package transform
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import (
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"crypto/sha1"
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"io"
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"math/rand"
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"github.com/prymitive/karma/internal/config"
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"github.com/prymitive/karma/internal/models"
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"github.com/prymitive/karma/internal/slices"
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"github.com/hansrodtang/randomcolor"
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log "github.com/sirupsen/logrus"
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)
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func labelToSeed(key string, val string) int64 {
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h := sha1.New()
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_, err := io.WriteString(h, key)
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if err != nil {
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log.Errorf("Failed to write label key '%s' to the seed sha1: %s", key, err)
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}
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_, err = io.WriteString(h, val)
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if err != nil {
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log.Errorf("Failed to write label value '%s' to the seed sha1: %s", val, err)
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}
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var seed int64
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for _, i := range h.Sum(nil) {
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seed += int64(i)
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}
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return seed
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}
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// ColorLabel update karmaColorMap object with a color object generated
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// from label key and value passed here
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// It's used to generate unique colors for configured labels
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func ColorLabel(colorStore models.LabelsColorMap, key string, val string) {
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if slices.StringInSlice(config.Config.Labels.Color.Unique, key) {
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if _, found := colorStore[key]; !found {
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colorStore[key] = make(map[string]models.LabelColors)
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}
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if _, found := colorStore[key][val]; !found {
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rand.Seed(labelToSeed(key, val))
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color := randomcolor.New(randomcolor.Random, randomcolor.LIGHT)
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red, green, blue, alpha := color.RGBA()
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bc := models.Color{
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Red: uint8(red >> 8),
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Green: uint8(green >> 8),
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Blue: uint8(blue >> 8),
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Alpha: uint8(alpha >> 8),
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}
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// check if color is bright or dark and pick the right background
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// uses https://www.w3.org/WAI/ER/WD-AERT/#color-contrast method
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brightness := ((int32(bc.Red) * 299) + (int32(bc.Green) * 587) + (int32(bc.Blue) * 114)) / 1000
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colorStore[key][val] = models.LabelColors{
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Brightness: brightness,
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Background: bc,
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}
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}
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}
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}
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