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