feat: add portable Windows zone manager

internal/layout/layout.go

@@ -0,0 +1,58 @@
+package layout
+
+import (
+	"math"
+
+	"github.com/stevec/fancywin/internal/config"
+)
+
+type Rect struct{ Left, Top, Right, Bottom int32 }
+type Point struct{ X, Y int32 }
+
+func Resolve(work Rect, z config.Zone, gap int) Rect {
+	w, h := float64(work.Right-work.Left), float64(work.Bottom-work.Top)
+	r := Rect{
+		Left:   work.Left + int32(math.Round(w*z.X/100)),
+		Top:    work.Top + int32(math.Round(h*z.Y/100)),
+		Right:  work.Left + int32(math.Round(w*(z.X+z.Width)/100)),
+		Bottom: work.Top + int32(math.Round(h*(z.Y+z.Height)/100)),
+	}
+	g := int32(gap)
+	r.Left += g
+	r.Top += g
+	r.Right -= g
+	r.Bottom -= g
+	if r.Right <= r.Left {
+		r.Right = r.Left + 1
+	}
+	if r.Bottom <= r.Top {
+		r.Bottom = r.Top + 1
+	}
+	return r
+}
+
+func Contains(r Rect, p Point) bool {
+	return p.X >= r.Left && p.X < r.Right && p.Y >= r.Top && p.Y < r.Bottom
+}
+
+func ZoneAt(work Rect, zones []config.Zone, gap int, p Point) int {
+	for i, z := range zones {
+		if Contains(Resolve(work, z, gap), p) {
+			return i
+		}
+	}
+	return -1
+}
+
+func Closest(work Rect, zones []config.Zone, p Point) int {
+	best, bestD := -1, math.MaxFloat64
+	for i, z := range zones {
+		r := Resolve(work, z, 0)
+		cx, cy := float64(r.Left+r.Right)/2, float64(r.Top+r.Bottom)/2
+		dx, dy := float64(p.X)-cx, float64(p.Y)-cy
+		if d := dx*dx + dy*dy; d < bestD {
+			best, bestD = i, d
+		}
+	}
+	return best
+}

internal/layout/layout_test.go

@@ -0,0 +1,21 @@
+package layout
+
+import (
+	"github.com/stevec/fancywin/internal/config"
+	"testing"
+)
+
+func TestResolvePercentageAndGap(t *testing.T) {
+	got := Resolve(Rect{0, 0, 1920, 1040}, config.Zone{X: 50, Y: 0, Width: 50, Height: 100}, 8)
+	want := (Rect{968, 8, 1912, 1032})
+	if got != want {
+		t.Fatalf("got %+v, want %+v", got, want)
+	}
+}
+
+func TestZoneAt(t *testing.T) {
+	z := []config.Zone{{X: 0, Y: 0, Width: 50, Height: 100}, {X: 50, Y: 0, Width: 50, Height: 100}}
+	if got := ZoneAt(Rect{0, 0, 100, 100}, z, 0, Point{75, 20}); got != 1 {
+		t.Fatalf("got %d", got)
+	}
+}