101 lines
2.5 KiB
Go
101 lines
2.5 KiB
Go
package render
|
|
|
|
import (
|
|
"image"
|
|
"image/color"
|
|
"math"
|
|
|
|
"golang.org/x/image/draw"
|
|
)
|
|
|
|
// pattern provides infinite algorithmically generated patterns and implements
|
|
// the image.Image interface.
|
|
type pattern struct{}
|
|
|
|
// Image interface
|
|
func (c *pattern) ColorModel() color.Model { return color.NRGBAModel }
|
|
func (c *pattern) At(x, y int) color.Color { return color.Transparent }
|
|
func (c *pattern) Bounds() image.Rectangle {
|
|
return image.Rectangle{image.Point{-1e9, -1e9}, image.Point{1e9, 1e9}}
|
|
}
|
|
|
|
func (p *pattern) ToFixedImage(bounds image.Rectangle) *image.NRGBA {
|
|
img := image.NewNRGBA(bounds)
|
|
draw.Draw(img, bounds, p, image.Point{}, draw.Src)
|
|
return img
|
|
}
|
|
|
|
type StripePattern struct {
|
|
pattern
|
|
Palette color.Palette
|
|
Size int
|
|
}
|
|
|
|
func (c *StripePattern) At(x, y int) color.Color {
|
|
n := len(c.Palette)
|
|
if n == 0 {
|
|
return color.Transparent
|
|
}
|
|
|
|
pxPerStripe := c.Size / n
|
|
if pxPerStripe <= 0 {
|
|
pxPerStripe = 1
|
|
}
|
|
stripeIndex := y / pxPerStripe % n // FIXME: y - c.Size? -> negative modulo fix
|
|
return c.Palette[stripeIndex]
|
|
}
|
|
|
|
func NewPrideImage(p color.Palette, bounds image.Rectangle) image.Image {
|
|
pattern := StripePattern{Palette: p, Size: bounds.Dy()}
|
|
return pattern.ToFixedImage(bounds)
|
|
}
|
|
|
|
var PrideFlags = map[string]color.Palette{
|
|
"lgbti": color.Palette{
|
|
color.NRGBA{0xe4, 0x03, 0x03, 0xff},
|
|
color.NRGBA{0xff, 0x8c, 0x00, 0xff},
|
|
color.NRGBA{0xff, 0xed, 0x00, 0xff},
|
|
color.NRGBA{0x00, 0x80, 0x26, 0xff},
|
|
color.NRGBA{0x00, 0x4d, 0xff, 0xff},
|
|
color.NRGBA{0x75, 0x07, 0x87, 0xff},
|
|
},
|
|
"nonbinary": color.Palette{
|
|
color.NRGBA{0x9c, 0x5c, 0xd4, 0xff},
|
|
color.NRGBA{0xfc, 0xfc, 0xfc, 0xff},
|
|
color.NRGBA{0xfc, 0xf4, 0x34, 0xff},
|
|
color.NRGBA{0x2c, 0x2c, 0x2c, 0xff},
|
|
},
|
|
"trans": color.Palette{
|
|
color.NRGBA{0x5b, 0xde, 0xfa, 0xff},
|
|
color.NRGBA{0xf5, 0xa9, 0xb8, 0xff},
|
|
color.NRGBA{0xff, 0xff, 0xff, 0xff},
|
|
color.NRGBA{0xf5, 0xa9, 0xb8, 0xff},
|
|
color.NRGBA{0x5b, 0xde, 0xfa, 0xff},
|
|
},
|
|
}
|
|
|
|
type SineColorPattern struct {
|
|
pattern
|
|
Luma uint8
|
|
Freq float64
|
|
Phase float64
|
|
}
|
|
|
|
func (c *SineColorPattern) At(x, y int) color.Color {
|
|
TAU := 6.28318
|
|
offset := 0.5
|
|
scale := 0.5
|
|
v := math.Atan2(float64(x), float64(y))
|
|
|
|
col := color.NRGBA{}
|
|
col.R = uint8((offset+scale*math.Sin(v/c.Freq*TAU))*128 + 128)
|
|
col.G = uint8((offset+scale*math.Sin(v/c.Freq*TAU+TAU/3))*128 + 128)
|
|
col.B = uint8((offset+scale*math.Sin(v/c.Freq*TAU+TAU/1.5))*128 + 128)
|
|
col.A = 0xff
|
|
|
|
// col.R = c.Luma
|
|
// col.G = uint8(math.Sin(float64(x)/c.Freq+c.Phase) * 128 + 128)
|
|
// col.B = uint8(math.Cos(float64(y)/c.Freq+c.Phase) * 128 + 128)
|
|
return col
|
|
}
|