op/clip: add bounds expansion after move

After moving the pen, the next action should update the bounds for the start position. References: https://todo.sr.ht/~eliasnaur/gio/451 Signed-off-by: Walter Werner SCHNEIDER <contact@schnwalter.eu>
2025-07-15 18:40:31 +03:00
parent ba82ae46d0
commit 0c145b3815
2 changed files with 112 additions and 3 deletions
@@ -0,0 +1,106 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+package clip
+
+import (
+	"gioui.org/f32"
+	"gioui.org/op"
+	"math"
+	"testing"
+)
+
+func TestPath_MoveTo_LineTo(t *testing.T) {
+	var ops op.Ops
+	p := Path{}
+	p.Begin(&ops)
+	startPoint := f32.Pt(32, 32)
+	endPoint := f32.Pt(64, 64)
+	p.MoveTo(startPoint)
+	p.LineTo(endPoint)
+	pathSpec := p.End()
+
+	minPoint := f32.Pt(32, 32)
+	maxPoint := f32.Pt(64, 64)
+	if pathSpec.bounds.Min == pathSpec.bounds.Max {
+		t.Errorf("zero path")
+	}
+	if pathSpec.bounds.Min != minPoint.Round() {
+		t.Errorf("pathSpec.bounds.Min = %v, want %v", pathSpec.bounds.Min, minPoint)
+	}
+	if pathSpec.bounds.Max != maxPoint.Round() {
+		t.Errorf("pathSpec.bounds.Max = %v, want %v", pathSpec.bounds.Max, maxPoint)
+	}
+}
+
+func TestPath_MoveTo_QuadTo(t *testing.T) {
+	var ops op.Ops
+	p := Path{}
+	p.Begin(&ops)
+	startPoint := f32.Pt(32, 32)
+	midPoint := f32.Pt(60, 60)
+	p.MoveTo(startPoint)
+	p.QuadTo(midPoint.Sub(f32.Pt(-4, 0)), midPoint.Sub(f32.Pt(0, -4)))
+	pathSpec := p.End()
+
+	minPoint := f32.Pt(32, 32)
+	maxPoint := f32.Pt(64, 64)
+	if pathSpec.bounds.Min == pathSpec.bounds.Max {
+		t.Errorf("zero path")
+	}
+	if pathSpec.bounds.Min != minPoint.Round() {
+		t.Errorf("pathSpec.bounds.Min = %v, want %v", pathSpec.bounds.Min, minPoint)
+	}
+	if pathSpec.bounds.Max != maxPoint.Round() {
+		t.Errorf("pathSpec.bounds.Max = %v, want %v", pathSpec.bounds.Max, maxPoint)
+	}
+}
+
+func TestPath_MoveTo_ArcTo(t *testing.T) {
+	// We need a tolerance here because of rounding errors.
+	tolerance := f32.Pt(1, 1)
+
+	var ops op.Ops
+	p := Path{}
+	p.Begin(&ops)
+	arcStartPoint := f32.Pt(48, 32)
+	arcCenterPoint := f32.Pt(48, 48)
+	p.MoveTo(arcStartPoint)
+	p.ArcTo(arcCenterPoint, arcCenterPoint, math.Pi*2)
+	pathSpec := p.End()
+
+	minPoint := f32.Pt(32, 32).Sub(tolerance).Round()
+	maxPoint := f32.Pt(64, 64).Add(tolerance).Round()
+	if pathSpec.bounds.Min == pathSpec.bounds.Max {
+		t.Errorf("zero path")
+	}
+	if pathSpec.bounds.Min.X < minPoint.X || pathSpec.bounds.Min.Y < minPoint.Y {
+		t.Errorf("pathSpec.bounds.Min = %v, want %v", pathSpec.bounds.Min, minPoint)
+	}
+	if pathSpec.bounds.Max.X > maxPoint.X || pathSpec.bounds.Max.Y > maxPoint.Y {
+		t.Errorf("pathSpec.bounds.Max = %v, want %v", pathSpec.bounds.Max, maxPoint)
+	}
+}
+
+func TestPath_MoveTo_CubeTo(t *testing.T) {
+	var ops op.Ops
+	p := Path{}
+	p.Begin(&ops)
+	startPoint := f32.Pt(32, 32)
+	midPoint := f32.Pt(48, 48)
+	endPoint := f32.Pt(64, 64)
+	p.MoveTo(startPoint)
+	p.CubeTo(midPoint.Sub(f32.Pt(-4, 0)), midPoint.Sub(f32.Pt(0, -4)), endPoint)
+	pathSpec := p.End()
+
+	minPoint := f32.Pt(32, 32)
+	maxPoint := f32.Pt(64, 64)
+	if pathSpec.bounds.Min == pathSpec.bounds.Max {
+		t.Errorf("zero path")
+	}
+	if pathSpec.bounds.Min != minPoint.Round() {
+		t.Errorf("pathSpec.bounds.Min = %v, want %v", pathSpec.bounds.Min, minPoint)
+	}
+	if pathSpec.bounds.Max != maxPoint.Round() {
+		t.Errorf("pathSpec.bounds.Max = %v, want %v", pathSpec.bounds.Max, maxPoint)
+	}
+}