feat: primitive styling

client/world/style_test.go

@@ -0,0 +1,95 @@
+package world
+
+import (
+	"image/color"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestStyleOverrideApply_OverridesOnlyProvidedFields(t *testing.T) {
+	t.Parallel()
+
+	base := Style{
+		FillColor:        color.RGBA{R: 1, A: 255},
+		StrokeColor:      color.RGBA{G: 2, A: 255},
+		StrokeWidthPx:    1.0,
+		StrokeDashes:     []float64{3, 1},
+		StrokeDashOffset: 0.5,
+		PointRadiusPx:    2.0,
+	}
+
+	newWidth := 5.0
+	newRadius := 7.0
+
+	override := StyleOverride{
+		StrokeWidthPx: &newWidth,
+		PointRadiusPx: &newRadius,
+		// Everything else is unset (nil) => must remain from base.
+	}
+
+	out := override.Apply(base)
+
+	require.Equal(t, base.FillColor, out.FillColor)
+	require.Equal(t, base.StrokeColor, out.StrokeColor)
+	require.Equal(t, 5.0, out.StrokeWidthPx)
+	require.Equal(t, base.StrokeDashes, out.StrokeDashes)
+	require.Equal(t, base.StrokeDashOffset, out.StrokeDashOffset)
+	require.Equal(t, 7.0, out.PointRadiusPx)
+}
+
+func TestStyleTable_DefaultsExistAndAreStable(t *testing.T) {
+	t.Parallel()
+
+	tbl := NewStyleTable()
+
+	_, ok := tbl.Get(StyleIDDefaultLine)
+	require.True(t, ok)
+
+	_, ok = tbl.Get(StyleIDDefaultCircle)
+	require.True(t, ok)
+
+	_, ok = tbl.Get(StyleIDDefaultPoint)
+	require.True(t, ok)
+}
+
+func TestStyleTable_AddDerived_StoresResolvedStyleAndCopiesSlices(t *testing.T) {
+	t.Parallel()
+
+	tbl := NewStyleTable()
+
+	dashes := []float64{10, 5}
+	override := StyleOverride{
+		StrokeDashes: &dashes,
+	}
+	id := tbl.AddDerived(StyleIDDefaultLine, override)
+
+	got, ok := tbl.Get(id)
+	require.True(t, ok)
+	require.Equal(t, []float64{10, 5}, got.StrokeDashes)
+
+	// Mutate caller slice; table must not change.
+	dashes[0] = 999
+
+	got2, ok := tbl.Get(id)
+	require.True(t, ok)
+	require.Equal(t, []float64{10, 5}, got2.StrokeDashes)
+
+	// Mutate returned slice; table must not change.
+	got2.StrokeDashes[0] = 123
+
+	got3, ok := tbl.Get(id)
+	require.True(t, ok)
+	require.Equal(t, []float64{10, 5}, got3.StrokeDashes)
+}
+
+func TestDefaultPriorities_AreOrderedAndStepped(t *testing.T) {
+	t.Parallel()
+
+	require.Equal(t, 100, DefaultPriorityLine)
+	require.Equal(t, 200, DefaultPriorityCircle)
+	require.Equal(t, 300, DefaultPriorityPoint)
+
+	require.Less(t, DefaultPriorityLine, DefaultPriorityCircle)
+	require.Less(t, DefaultPriorityCircle, DefaultPriorityPoint)
+}