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 +1,163 @@
+package world
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestDrawCirclesFromPlan_DuplicatesAcrossTilesAndClips(t *testing.T) {
+	t.Parallel()
+
+	// World is 10x10 world units => 10000x10000 fixed.
+	w := NewWorld(10, 10)
+	w.resetGrid(2 * SCALE)
+
+	// Circle near origin so that in expanded canvas (bigger than world)
+	// it will appear in multiple torus tiles.
+	id, err := w.AddCircle(1.0, 1.0, 1.0) // center (1000,1000), radius 1000
+	require.NoError(t, err)
+
+	w.indexObject(w.objects[id])
+
+	// Same geometry as points-only test:
+	// viewport 10x10 px, margins 2px => canvas 14x14 px at zoom=1 => expanded span 14 units > world.
+	params := RenderParams{
+		ViewportWidthPx:  10,
+		ViewportHeightPx: 10,
+		MarginXPx:        2,
+		MarginYPx:        2,
+		CameraXWorldFp:   5 * SCALE,
+		CameraYWorldFp:   5 * SCALE,
+		CameraZoom:       1.0,
+	}
+
+	plan, err := w.buildRenderPlanStageA(params)
+	require.NoError(t, err)
+
+	d := &fakePrimitiveDrawer{}
+	drawCirclesFromPlan(d, plan, w.W, w.H)
+
+	// Expect 4 circle copies, one per tile that covers the expanded canvas.
+	wantNames := []string{
+		"Save", "ClipRect", "AddCircle", "Fill", "Restore",
+		"Save", "ClipRect", "AddCircle", "Fill", "Restore",
+		"Save", "ClipRect", "AddCircle", "Fill", "Restore",
+		"Save", "ClipRect", "AddCircle", "Fill", "Restore",
+	}
+	require.Equal(t, wantNames, d.CommandNames())
+
+	// At zoom=1, 1 world unit -> 1 px, so:
+	// circle center at (1,1) => base copy at (3,3) like point test
+	// radius 1 => 1 px
+	//
+	// The rest are shifted by +10px in X and/or Y due to torus tiling.
+	{
+		clip := requireDrawerCommandAt(t, d, 1)
+		require.Equal(t, "ClipRect", clip.Name)
+		requireCommandArgs(t, clip, 2, 2, 10, 10)
+
+		c := requireDrawerCommandAt(t, d, 2)
+		require.Equal(t, "AddCircle", c.Name)
+		requireCommandArgs(t, c, 3, 3, 1)
+	}
+
+	{
+		clip := requireDrawerCommandAt(t, d, 6)
+		require.Equal(t, "ClipRect", clip.Name)
+		requireCommandArgs(t, clip, 2, 12, 10, 2)
+
+		c := requireDrawerCommandAt(t, d, 7)
+		require.Equal(t, "AddCircle", c.Name)
+		requireCommandArgs(t, c, 3, 13, 1)
+	}
+
+	{
+		clip := requireDrawerCommandAt(t, d, 11)
+		require.Equal(t, "ClipRect", clip.Name)
+		requireCommandArgs(t, clip, 12, 2, 2, 10)
+
+		c := requireDrawerCommandAt(t, d, 12)
+		require.Equal(t, "AddCircle", c.Name)
+		requireCommandArgs(t, c, 13, 3, 1)
+	}
+
+	{
+		clip := requireDrawerCommandAt(t, d, 16)
+		require.Equal(t, "ClipRect", clip.Name)
+		requireCommandArgs(t, clip, 12, 12, 2, 2)
+
+		c := requireDrawerCommandAt(t, d, 17)
+		require.Equal(t, "AddCircle", c.Name)
+		requireCommandArgs(t, c, 13, 13, 1)
+	}
+}
+
+func TestDrawCirclesFromPlan_SkipsTilesWithoutCircles(t *testing.T) {
+	t.Parallel()
+
+	w := NewWorld(10, 10)
+	w.resetGrid(2 * SCALE)
+
+	// Add only a point, no circles.
+	id, err := w.AddPoint(5, 5)
+	require.NoError(t, err)
+	w.indexObject(w.objects[id])
+
+	params := RenderParams{
+		ViewportWidthPx:  10,
+		ViewportHeightPx: 10,
+		MarginXPx:        2,
+		MarginYPx:        2,
+		CameraXWorldFp:   5 * SCALE,
+		CameraYWorldFp:   5 * SCALE,
+		CameraZoom:       1.0,
+	}
+
+	plan, err := w.buildRenderPlanStageA(params)
+	require.NoError(t, err)
+
+	d := &fakePrimitiveDrawer{}
+	drawCirclesFromPlan(d, plan, w.W, w.H)
+
+	// No circles => no commands.
+	require.Empty(t, d.Commands())
+}
+
+func TestDrawCirclesFromPlan_ProjectsRadiusWithZoom(t *testing.T) {
+	t.Parallel()
+
+	w := NewWorld(100, 100)
+	w.resetGrid(10 * SCALE)
+
+	// radius 2 world units; zoom=2 => should be 4 px when 1 unit == 1px at zoom=1.
+	id, err := w.AddCircle(50, 50, 2)
+	require.NoError(t, err)
+	w.indexObject(w.objects[id])
+
+	params := RenderParams{
+		ViewportWidthPx:  10,
+		ViewportHeightPx: 10,
+		MarginXPx:        2,
+		MarginYPx:        2,
+		CameraXWorldFp:   50 * SCALE,
+		CameraYWorldFp:   50 * SCALE,
+		CameraZoom:       2.0,
+	}
+
+	plan, err := w.buildRenderPlanStageA(params)
+	require.NoError(t, err)
+
+	d := &fakePrimitiveDrawer{}
+	drawCirclesFromPlan(d, plan, w.W, w.H)
+
+	// There should be at least one AddCircle.
+	cmds := d.CommandsByName("AddCircle")
+	require.NotEmpty(t, cmds)
+
+	// All circles in this plan should have radius 4px (2 units * 2x zoom).
+	for _, c := range cmds {
+		require.Len(t, c.Args, 3)
+		require.Equal(t, 4.0, c.Args[2])
+	}
+}