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darkerThan

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Codeberg 2019-05-28 12:48:54 +02:00 committed by Holger Waechtler
parent af248521cb
commit cb12883b6f
1 changed files with 16 additions and 8 deletions
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22
main.go
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@ -126,13 +126,13 @@ func (c *RGB) to_hsv() *HSV {
h = 0.0
if min != v {
if v == r {
h = math.Mod((g - b) / C, 6.0)
h = math.Mod((g-b)/C, 6.0)
}
if v == g {
h = (b - r) / C + 2.0
h = (b-r)/C + 2.0
}
if v == b {
h = (r - g) / C + 4.0
h = (r-g)/C + 4.0
}
h *= 60.0
if h < 0.0 {
@ -189,10 +189,18 @@ func (c *RGB) brighterOrDarkerThan(ref RGB, delta uint8) string {
}
func (c *RGB) darkerThan(ref RGB, delta uint8) string {
/* XXX FIXME: THIS IS NOT CORRECT. The original implementation does darkening in HSV space.
* cf. https://github.com/DiceBear/avatars/blob/master/packages/avatars/src/color.ts
*/
return fmt.Sprintf("#%02x%02x%02x", sub255(c.r, delta), sub255(c.g, delta), sub255(c.b, delta))
primary := c.to_hsv()
secondary := ref.to_hsv()
delta_f := float64(delta) * 1.0 / 255.0
if primary.v <= secondary.v-delta_f {
return fmt.Sprintf("#%02x%02x%02x", c.r, c.g, c.b)
}
primary.v = secondary.v - delta_f
if primary.v < 0 {
primary.v = 0
}
c = primary.to_rgb()
return fmt.Sprintf("#%02x%02x%02x", c.r, c.g, c.b)
}
func (c RGB) withAlpha(alpha float64) string {