Add boolean test

test/boolean/main.go

@@ -0,0 +1,137 @@
+package main
+
+import (
+	"github.com/tdewolff/canvas"
+	"github.com/tdewolff/canvas/renderers"
+)
+
+var font *canvas.FontFamily
+
+// Shapes from http://assets.paperjs.org/boolean/
+func main() {
+	font = canvas.NewFontFamily("latin")
+	if err := font.LoadSystemFont("DejaVu Serif", canvas.FontRegular); err != nil {
+		panic(err)
+	}
+
+	c := canvas.New(0.0, 0.0)
+	ctx := canvas.NewContext(c)
+
+	face := font.Face(4.0, canvas.Black, canvas.FontRegular, canvas.FontNormal)
+	ctx.DrawText(20.0, -2.0, canvas.NewTextLine(face, "A and B", canvas.Center))
+	ctx.DrawText(32.0, -2.0, canvas.NewTextLine(face, "A or B", canvas.Center))
+	ctx.DrawText(44.0, -2.0, canvas.NewTextLine(face, "A xor B", canvas.Center))
+	ctx.DrawText(56.0, -2.0, canvas.NewTextLine(face, "A not B", canvas.Center))
+	ctx.DrawText(68.0, -2.0, canvas.NewTextLine(face, "B not A", canvas.Center))
+
+	a := canvas.Rectangle(3.0, 8.0).Translate(5.0, 1.0)
+	p0 := canvas.Circle(3.0).Translate(6.0, 5.0)
+	draw(ctx, -14.0, a, p0)
+	draw(ctx, -26.0, a, p0.Reverse())
+	draw(ctx, -38.0, a.Reverse(), p0)
+	draw(ctx, -50.0, a.Reverse(), p0.Reverse())
+
+	p1 := canvas.Circle(1.5).Reverse().Translate(8.0, 7.0)
+	draw(ctx, -74.0, a, p0)
+	draw(ctx, -86.0, a, p1)
+	draw(ctx, -98.0, a, p0.Append(p1))
+	draw2(ctx, -110.0, a, p0.Append(p1))
+
+	draw(ctx, -134.0, p0, a)
+	draw(ctx, -146.0, p1, a)
+	draw(ctx, -158.0, p0.Append(p1), a)
+	draw2(ctx, -170.0, p0.Append(p1), a)
+
+	a = canvas.Rectangle(2.0, 4.0).Translate(1.0, 0.0)
+	b := canvas.Rectangle(4.0, 2.0).Translate(0.0, 1.0)
+	b = b.Append(canvas.Circle(1.0).Reverse().Translate(3.0, 3.0))
+	draw(ctx, -194.0, a, b)
+
+	c.Fit(1.0)
+	c.SetZIndex(-1)
+	ctx.SetFillColor(canvas.White)
+	ctx.SetStrokeColor(canvas.Transparent)
+	ctx.DrawPath(0, 0, canvas.Rectangle(c.W, c.H))
+
+	renderers.Write("boolean.png", c, canvas.DPMM(20.0))
+}
+
+func draw2(ctx *canvas.Context, y float64, p, q *canvas.Path) {
+	p = p.Flatten(0.01)
+	q = q.Flatten(0.01)
+
+	ctx.SetFillColor(canvas.Hex("#CCC8"))
+	ctx.SetStrokeColor(canvas.Transparent)
+	ctx.DrawPath(3.0, y, p)
+	ctx.DrawPath(3.0, y, q)
+
+	ctx.SetFillColor(canvas.Transparent)
+	ctx.SetStrokeColor(canvas.Black)
+	ctx.SetStrokeWidth(0.05)
+	ctx.DrawPath(3.0, y, p)
+	ctx.DrawPath(3.0, y, q)
+
+	ctx.SetFillColor(canvas.Transparent)
+	ctx.SetStrokeColor(canvas.Hex("#CCC"))
+	ctx.SetStrokeWidth(0.1)
+	for i := 1; i < 6; i++ {
+		x := 3.0 + 12.0*float64(i)
+		ctx.DrawPath(x, y, p)
+		ctx.DrawPath(x, y, q)
+	}
+
+	ctx.SetFillColor(canvas.Hex("#00C8"))
+	ctx.SetStrokeColor(canvas.Black)
+	ctx.SetStrokeWidth(0.1)
+	ctx.DrawPath(15.0, y, p.And(q))
+	ctx.DrawPath(27.0, y, p.Or(q))
+	ctx.DrawPath(39.0, y, p.Xor(q))
+	ctx.DrawPath(51.0, y, p.Not(q))
+	ctx.DrawPath(63.0, y, q.Not(p))
+}
+
+func draw(ctx *canvas.Context, y float64, p, q *canvas.Path) {
+	p = p.Flatten(0.01)
+	q = q.Flatten(0.01)
+
+	ctx.SetFillColor(canvas.Hex("#CCC8"))
+	ctx.SetStrokeColor(canvas.Transparent)
+	ctx.DrawPath(3.0, y, p)
+	ctx.DrawPath(3.0, y, q)
+
+	ctx.SetFillColor(canvas.Transparent)
+	ctx.SetStrokeColor(canvas.Black)
+	ctx.SetStrokeWidth(0.05)
+	ctx.DrawPath(3.0, y, p)
+	ctx.DrawPath(3.0, y, q)
+
+	ctx.SetFillColor(canvas.Transparent)
+	ctx.SetStrokeColor(canvas.Hex("#CCC"))
+	ctx.SetStrokeWidth(0.1)
+	for i := 1; i < 6; i++ {
+		x := 3.0 + 12.0*float64(i)
+		ctx.DrawPath(x, y, p)
+		ctx.DrawPath(x, y, q)
+	}
+
+	ctx.SetFillColor(canvas.Hex("#00C8"))
+	ctx.SetStrokeColor(canvas.Black)
+	ctx.SetStrokeWidth(0.1)
+
+	for i, R := range []*canvas.Path{
+		p.And(q),
+		p.Or(q),
+		p.Xor(q),
+		p.Not(q),
+		q.Not(p),
+	} {
+		for _, r := range R.Split() {
+			if r.CCW() {
+				ctx.SetFillColor(canvas.Hex("#0C08"))
+			} else {
+				ctx.SetFillColor(canvas.Hex("#C008"))
+			}
+			ctx.DrawPath(15+12*float64(i), y, r)
+		}
+	}
+}