Impl identicons serverside, broken though for some reason

shared/identicon/shape.go

@@ -0,0 +1,112 @@
+package identicon
+
+import (
+	"math"
+
+	"git.mstar.dev/mstar/canvas"
+	mathutils "git.mstar.dev/mstar/goutils/math"
+)
+
+type shape struct {
+	canvas      *canvas.Canvas
+	hash        int
+	primary     string
+	secondary   string
+	pos         vec2
+	scale       float64
+	cellSize    int
+	strokeColor string
+}
+
+func (s *shape) GetColor() string {
+	if mathutils.Abs(s.hash) == 0 {
+		return s.primary
+	} else {
+		return s.secondary
+	}
+}
+
+func (s *shape) MakePath() {
+	mod := mathutils.Abs(s.hash+1) % 4
+	switch mod {
+	case 0:
+		// square
+		s.canvas.BeginPath()
+		s.canvas.MoveTo(float64(s.pos.X), float64(s.pos.Y))
+		s.canvas.LineTo(float64(s.pos.X+float64(s.cellSize/2)), float64(s.pos.Y))
+		s.canvas.LineTo(
+			float64(s.pos.X+float64(s.cellSize/2)),
+			float64(s.pos.Y-float64(s.cellSize/2)),
+		)
+		s.canvas.LineTo(float64(s.pos.X), float64(s.pos.Y-float64(s.cellSize/2)))
+		s.canvas.ClosePath()
+	case 1:
+		// circle
+		s.canvas.BeginPath()
+		s.canvas.Arc(
+			float64(s.pos.X)+float64(s.cellSize)/math.Pi-5,
+			float64(s.pos.Y)-float64(s.cellSize)/math.Pi+5,
+			float64(s.cellSize)/3,
+			0,
+			math.Pi*2,
+			true,
+		)
+	case 2:
+		// triangle
+		s.canvas.BeginPath()
+		s.canvas.MoveTo(float64(s.pos.X), float64(s.pos.Y))
+		s.canvas.LineTo(float64(s.pos.X)+float64(s.cellSize)*0.65, float64(s.pos.Y))
+		s.canvas.LineTo(float64(s.pos.X), float64(s.pos.Y)-float64(s.cellSize)*0.65)
+		s.canvas.ClosePath()
+	case 3:
+		// oval
+		s.canvas.BeginPath()
+		s.canvas.MoveTo(
+			float64(s.pos.X)-float64(s.cellSize)*0.2,
+			float64(s.pos.Y)+float64(s.cellSize)*0.2,
+		)
+		s.canvas.QuadraticCurveTo(
+			float64(s.pos.X)+float64(s.cellSize)*0.4,
+			float64(s.pos.Y),
+			float64(s.pos.X)+float64(s.cellSize)*0.5,
+			float64(s.pos.Y)-float64(s.cellSize)*0.5,
+		)
+		s.canvas.MoveTo(
+			float64(s.pos.X)+float64(s.cellSize)*0.5,
+			float64(s.pos.Y)-float64(s.cellSize)*0.5,
+		)
+		s.canvas.QuadraticCurveTo(
+			float64(s.pos.X),
+			float64(s.pos.Y)-float64(s.cellSize)*0.4,
+			float64(s.pos.X)-float64(s.cellSize)*0.2,
+			float64(s.pos.Y)+float64(s.cellSize)*0.2,
+		)
+	default:
+		// square
+		s.canvas.BeginPath()
+		s.canvas.MoveTo(float64(s.pos.X), float64(s.pos.Y))
+		s.canvas.LineTo(float64(s.pos.X+float64(s.cellSize/2)), float64(s.pos.Y))
+		s.canvas.LineTo(
+			float64(s.pos.X+float64(s.cellSize/2)),
+			float64(s.pos.Y-float64(s.cellSize/2)),
+		)
+		s.canvas.LineTo(float64(s.pos.X), float64(s.pos.Y-float64(s.cellSize/2)))
+		s.canvas.ClosePath()
+	}
+}
+
+func (s *shape) Draw(hasStroke bool, strokeWeight int) {
+	color := s.GetColor()
+	// THIS SHIT ISN'T IMPLEMENTED! I hope it will work regardless
+	// s.canvas.SetGlobalCompositeOperation("source-over")
+	s.MakePath()
+	s.canvas.SetFillStyle(color)
+	s.canvas.SetStrokeStyle(s.strokeColor)
+	s.canvas.SetLineWidth(s.scale * (4 / 5 * float64(strokeWeight)) / float64(canvasSize))
+	s.canvas.SetLineJoin(canvas.Round)
+	s.canvas.SetLineCap(canvas.Round)
+	s.canvas.Fill()
+	if hasStroke {
+		s.canvas.Stroke()
+	}
+}