ui: basic map scroller

2026-03-06 23:29:06 +02:00
parent 29d188969b
commit 1de621c743
68 changed files with 9861 additions and 118 deletions
@@ -0,0 +1,144 @@
+package world
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestPlanIncrementalPan_NoOp(t *testing.T) {
+	t.Parallel()
+
+	plan, err := PlanIncrementalPan(200, 100, 50, 30, 0, 0)
+	require.NoError(t, err)
+	require.Equal(t, IncrementalNoOp, plan.Mode)
+	require.Empty(t, plan.Dirty)
+}
+
+func TestPlanIncrementalPan_FullRedrawOnInvalidCanvas(t *testing.T) {
+	t.Parallel()
+
+	_, err := PlanIncrementalPan(0, 100, 10, 10, 1, 0)
+	require.ErrorIs(t, err, errInvalidCanvasSize)
+}
+
+func TestPlanIncrementalPan_FullRedrawOnTooLargeShift(t *testing.T) {
+	t.Parallel()
+
+	plan, err := PlanIncrementalPan(100, 80, 40, 40, 100, 0)
+	require.NoError(t, err)
+	require.Equal(t, IncrementalFullRedraw, plan.Mode)
+
+	plan, err = PlanIncrementalPan(100, 80, 40, 40, 0, -80)
+	require.NoError(t, err)
+	require.Equal(t, IncrementalFullRedraw, plan.Mode)
+}
+
+func TestPlanIncrementalPan_FullRedrawWhenMarginIsZeroAndDeltaNonZero(t *testing.T) {
+	t.Parallel()
+
+	plan, err := PlanIncrementalPan(100, 80, 0, 20, 1, 0)
+	require.NoError(t, err)
+	require.Equal(t, IncrementalFullRedraw, plan.Mode)
+
+	plan, err = PlanIncrementalPan(100, 80, 20, 0, 0, 1)
+	require.NoError(t, err)
+	require.Equal(t, IncrementalFullRedraw, plan.Mode)
+}
+
+func TestPlanIncrementalPan_FullRedrawWhenExceedsThresholdX(t *testing.T) {
+	t.Parallel()
+
+	// marginX=20 => threshold=10, dx=11 => full redraw
+	plan, err := PlanIncrementalPan(200, 100, 20, 20, 11, 0)
+	require.NoError(t, err)
+	require.Equal(t, IncrementalFullRedraw, plan.Mode)
+}
+
+func TestPlanIncrementalPan_FullRedrawWhenExceedsThresholdY(t *testing.T) {
+	t.Parallel()
+
+	// marginY=20 => threshold=10, dy=-11 => full redraw
+	plan, err := PlanIncrementalPan(200, 100, 20, 20, 0, -11)
+	require.NoError(t, err)
+	require.Equal(t, IncrementalFullRedraw, plan.Mode)
+}
+
+func TestPlanIncrementalPan_Shift_LeftStripWhenDxPositive(t *testing.T) {
+	t.Parallel()
+
+	// marginX=40 => threshold=20, dx=5 => shift ok
+	plan, err := PlanIncrementalPan(200, 100, 40, 40, 5, 0)
+	require.NoError(t, err)
+	require.Equal(t, IncrementalShift, plan.Mode)
+	require.Equal(t, 5, plan.DxPx)
+	require.Equal(t, 0, plan.DyPx)
+
+	require.Equal(t, []RectPx{
+		{X: 0, Y: 0, W: 6, H: 100},
+	}, plan.Dirty)
+}
+
+func TestPlanIncrementalPan_Shift_RightStripWhenDxNegative(t *testing.T) {
+	t.Parallel()
+
+	plan, err := PlanIncrementalPan(200, 100, 40, 40, -7, 0)
+	require.NoError(t, err)
+	require.Equal(t, IncrementalShift, plan.Mode)
+
+	require.Equal(t, []RectPx{
+		{X: 200 - 8, Y: 0, W: 8, H: 100},
+	}, plan.Dirty)
+}
+
+func TestPlanIncrementalPan_Shift_TopStripWhenDyPositive(t *testing.T) {
+	t.Parallel()
+
+	plan, err := PlanIncrementalPan(200, 100, 40, 40, 0, 9)
+	require.NoError(t, err)
+	require.Equal(t, IncrementalShift, plan.Mode)
+
+	require.Equal(t, []RectPx{
+		{X: 0, Y: 0, W: 200, H: 10},
+	}, plan.Dirty)
+}
+
+func TestPlanIncrementalPan_Shift_BottomStripWhenDyNegative(t *testing.T) {
+	t.Parallel()
+
+	plan, err := PlanIncrementalPan(200, 100, 40, 40, 0, -9)
+	require.NoError(t, err)
+	require.Equal(t, IncrementalShift, plan.Mode)
+
+	require.Equal(t, []RectPx{
+		{X: 0, Y: 100 - 10, W: 200, H: 10},
+	}, plan.Dirty)
+}
+
+func TestPlanIncrementalPan_Shift_DiagonalReturnsTwoDirtyRects(t *testing.T) {
+	t.Parallel()
+
+	plan, err := PlanIncrementalPan(200, 100, 40, 40, -6, 8)
+	require.NoError(t, err)
+	require.Equal(t, IncrementalShift, plan.Mode)
+
+	// Overlap is allowed; we just require both strips exist.
+	require.Len(t, plan.Dirty, 2)
+	require.ElementsMatch(t, []RectPx{
+		{X: 200 - 7, Y: 0, W: 7, H: 100}, // right strip
+		{X: 0, Y: 0, W: 200, H: 9},       // top strip
+	}, plan.Dirty)
+}
+
+func TestPlanIncrementalPan_OverdrawsDirtyStripsByOnePixel(t *testing.T) {
+	t.Parallel()
+
+	plan, err := PlanIncrementalPan(200, 100, 40, 40, -7, 0)
+	require.NoError(t, err)
+	require.Equal(t, IncrementalShift, plan.Mode)
+
+	// Right strip width should be abs(dx)+1 = 8.
+	require.Equal(t, []RectPx{
+		{X: 200 - 8, Y: 0, W: 8, H: 100},
+	}, plan.Dirty)
+}