render

var DynPatterns = map[string]image.Image{
	"rbow": &DynamicPattern{
		Color: func(x, y int, p *DynamicPattern) (float64, float64, float64) {
			xx := float64(x) / 26.0
			yy := float64(y) / 13.0
			r := 0.5 + 0.5*math.Cos(xx+p.Phase)
			g := 0.5 + 0.5*math.Sin(yy+p.Phase)
			b := 0.5 + 0.5*math.Sin(xx+p.Phase)*math.Cos(yy+p.Phase)
			return r, g, b
		},
	},

	"pastel": &DynamicPattern{
		Brightness: 0.5,
		ColFactor:  0.5,
		Freq:       5.0,

		Color: func(x, y int, p *DynamicPattern) (float64, float64, float64) {
			offset := 0.0
			v := math.Atan2(float64(x)-offset, float64(y)-offset) + p.Phase
			r := 0.5 + 0.5*math.Sin(v*p.Freq)
			g := 0.5 + 0.5*math.Cos(v*p.Freq)
			b := 0.5 + 0.5*math.Sin(v*p.Freq+6.28318/p.Luma)
			return r, g, b
		},
	},
}

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},
	},
}