111 lines
2.7 KiB
Go
111 lines
2.7 KiB
Go
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package tins2021
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import (
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"image"
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"image/color"
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"github.com/llgcode/draw2d/draw2dimg"
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"github.com/lucasb-eyer/go-colorful"
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"opslag.de/schobers/geom"
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)
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var Orange = `#FF9849`
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var Blue = `#499BFF`
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func Clamp(f float64) float64 {
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if f < 0 {
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return 0
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}
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if f > 1 {
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return 1
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}
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return f
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}
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const hexagonRadius = 128
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func drawToGC(gc *draw2dimg.GraphicContext, color color.Color, points ...geom.PointF) {
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gc.SetStrokeColor(color)
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gc.SetFillColor(color)
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gc.MoveTo(points[0].XY())
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for _, p := range points[1:] {
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gc.LineTo(p.XY())
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}
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gc.Close()
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gc.FillStroke()
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}
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func Lighten(hexColor string, lighten float64) string {
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color := mustHexColor(hexColor)
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h, c, l := color.Hcl()
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lightened := colorful.Hcl(h, c, Clamp(l+lighten)).Clamped()
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return lightened.Hex()
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}
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func GenerateCube(hexColor string) image.Image {
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im := image.NewRGBA(image.Rect(0, 0, 2*hexagonRadius, 2*hexagonRadius))
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normal := mustHexColor(hexColor)
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h, c, l := normal.Hcl()
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light := colorful.Hcl(h, c, Clamp(l+0.1)).Clamped()
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dark := colorful.Hcl(h, c, Clamp(l-0.1)).Clamped()
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center, points := Hexagon(hexagonRadius)
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gc := draw2dimg.NewGraphicContext(im)
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drawToGC(gc, dark, points[2], points[3], points[4], center)
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drawToGC(gc, normal, points[4], points[5], points[0], center)
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drawToGC(gc, light, points[0], points[1], points[2], center)
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return im
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}
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func GenerateHexagon(hexColor string) image.Image {
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im := image.NewRGBA(image.Rect(0, 0, 2*hexagonRadius, 2*hexagonRadius))
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color := mustHexColor(hexColor)
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center, points := Hexagon(hexagonRadius)
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gc := draw2dimg.NewGraphicContext(im)
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drawToGC(gc, color, points[2], points[3], points[4], center)
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drawToGC(gc, color, points[4], points[5], points[0], center)
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drawToGC(gc, color, points[0], points[1], points[2], center)
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return im
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}
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func Hexagon(radius float64) (geom.PointF, []geom.PointF) {
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points := make([]geom.PointF, 6)
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center := geom.PtF(radius, radius)
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for i := range points {
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a := geom.Pi * (float64(i)/3 + (1. / 6))
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points[i] = center.Add(geom.PtF(radius*geom.Cos(a), -radius*geom.Sin(a)))
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}
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return center, points
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}
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func GenerateHole(hexColor string) image.Image {
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im := image.NewRGBA(image.Rect(0, 0, 2*hexagonRadius, 2*hexagonRadius))
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normal := mustHexColor(hexColor)
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h, c, l := normal.Hcl()
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light := colorful.Hcl(h, c, Clamp(l+0.1)).Clamped()
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dark := colorful.Hcl(h, c, Clamp(l-0.1)).Clamped()
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center, points := Hexagon(hexagonRadius)
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gc := draw2dimg.NewGraphicContext(im)
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drawToGC(gc, dark, points[5], points[0], points[1], center)
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drawToGC(gc, normal, points[1], points[2], points[3], center)
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drawToGC(gc, light, points[3], points[4], points[5], center)
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return im
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}
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func mustHexColor(s string) colorful.Color {
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c, err := colorful.Hex(s)
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if err != nil {
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panic("invalid color")
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}
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return c
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}
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