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util.go
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util.go
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package main
import (
//"fmt"
//"time"
"math"
//"math/rand"
"github.com/veandco/go-sdl2/sdl"
//"github.com/veandco/go-sdl2/gfx"
//"github.com/yakshaveinc/go-keycodes"
)
type HSV struct {
H, S, V float64
}
type RGB struct {
R, G, B float64
}
func (c HSV) RGB() sdl.Color {
var r, g, b float64
if c.S == 0 { //HSV from 0 to 1
r = c.V * 255
g = c.V * 255
b = c.V * 255
} else {
h := c.H/360 * 6
if h == 6 {
h = 0
} //H must be < 1
i := math.Floor(h) //Or ... var_i = floor( var_h )
v1 := c.V * (1 - c.S)
v2 := c.V * (1 - c.S*(h-i))
v3 := c.V * (1 - c.S*(1-(h-i)))
if i == 0 {
r = c.V
g = v3
b = v1
} else if i == 1 {
r = v2
g = c.V
b = v1
} else if i == 2 {
r = v1
g = c.V
b = v3
} else if i == 3 {
r = v1
g = v2
b = c.V
} else if i == 4 {
r = v3
g = v1
b = c.V
} else {
r = c.V
g = v1
b = v2
}
r = r * 255 //RGB results from 0 to 255
g = g * 255
b = b * 255
}
return sdl.Color{uint8(r), uint8(g), uint8(b), 255}
}
func IntegerAbs(x int) int {
if x < 0 {
return -x
}
return x
}