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brighterThan

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This commit is contained in:
Codeberg 2019-05-28 13:08:54 +02:00 committed by Holger Waechtler
parent 88ab3449de
commit 5fffca7b9c
1 changed files with 22 additions and 18 deletions
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40
main.go
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@ -166,26 +166,19 @@ func (c *HSV) to_rgb() *RGB {
return f2rgb(0, 0, 0)
}
func add255(x uint8, y uint8) uint8 {
if x < 255-y {
return x + y
func (c *RGB) brighterThan(ref RGB, delta uint8) string {
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)
}
return 255
primary.v = secondary.v + delta_f
if primary.v > 360 {
primary.v = 360
}
func sub255(x uint8, y uint8) uint8 {
if x > y {
return x - y
}
return 0
}
func (c *RGB) brighterOrDarkerThan(ref RGB, delta uint8) string {
/* XXX FIXME: THIS IS PROBABLY NOT CORRECT. Need to look into original implementation. */
if true {
return fmt.Sprintf("#%02x%02x%02x", add255(c.r, delta), add255(c.g, delta), add255(c.b, delta))
}
return ref.darkerThan(ref, delta)
c = primary.to_rgb()
return fmt.Sprintf("#%02x%02x%02x", c.r, c.g, c.b)
}
func (c *RGB) darkerThan(ref RGB, delta uint8) string {
@ -203,6 +196,17 @@ func (c *RGB) darkerThan(ref RGB, delta uint8) string {
return fmt.Sprintf("#%02x%02x%02x", c.r, c.g, c.b)
}
func (c *RGB) brighterOrDarkerThan(ref RGB, delta uint8) string {
primary := c.to_hsv()
secondary := ref.to_hsv()
if primary.v <= secondary.v {
return c.darkerThan(ref, delta)
} else {
return c.brighterThan(ref, delta)
}
}
func (c RGB) withAlpha(alpha float64) string {
return fmt.Sprintf("#%02x%02x%02x%02x", c.r, c.g, c.b, uint8(255*alpha))
}