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 +1,93 @@
+package world
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestCircles_WrapCopies_AppearInsideViewportWhenViewportEqualsWorld(t *testing.T) {
+	t.Parallel()
+
+	// World 10x10 units => 10px at zoom=1 when viewport==world.
+	w := NewWorld(10, 10)
+	w.resetGrid(2 * SCALE)
+
+	type tc struct {
+		name        string
+		x, y        float64
+		r           float64
+		wantCenters [][2]float64 // expected (cx,cy) in canvas px for zoom=1, worldRect min = 0
+	}
+
+	// Camera is centered => expanded world rect equals [0..W)x[0..H) when margin=0.
+	params := RenderParams{
+		ViewportWidthPx:  10,
+		ViewportHeightPx: 10,
+		MarginXPx:        0,
+		MarginYPx:        0,
+		CameraXWorldFp:   5 * SCALE,
+		CameraYWorldFp:   5 * SCALE,
+		CameraZoom:       1.0,
+	}
+
+	tests := []tc{
+		{
+			name: "bottom boundary wraps to top",
+			x:    5, y: 9, r: 2,
+			// Centers: original at y=9, copy at y=-1.
+			wantCenters: [][2]float64{{5, 9}, {5, -1}},
+		},
+		{
+			name: "right boundary wraps to left",
+			x:    9, y: 5, r: 2,
+			wantCenters: [][2]float64{{9, 5}, {-1, 5}},
+		},
+		{
+			name: "corner wraps to three extra copies",
+			x:    9, y: 9, r: 2,
+			wantCenters: [][2]float64{{9, 9}, {-1, 9}, {9, -1}, {-1, -1}},
+		},
+		{
+			name: "no wrap inside",
+			x:    5, y: 5, r: 2,
+			wantCenters: [][2]float64{{5, 5}},
+		},
+	}
+
+	for _, tt := range tests {
+		tt := tt
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+
+			w2 := NewWorld(10, 10)
+			w2.resetGrid(2 * SCALE)
+
+			_, err := w2.AddCircle(tt.x, tt.y, tt.r)
+			require.NoError(t, err)
+
+			for _, obj := range w2.objects {
+				w2.indexObject(obj)
+			}
+
+			plan, err := w2.buildRenderPlanStageA(params)
+			require.NoError(t, err)
+
+			d := &fakePrimitiveDrawer{}
+			drawCirclesFromPlan(d, plan, w2.W, w2.H)
+
+			cmds := d.CommandsByName("AddCircle")
+			require.Len(t, cmds, len(tt.wantCenters))
+
+			// Collect centers (ignore radius for this test).
+			got := make([][2]float64, 0, len(cmds))
+			for _, c := range cmds {
+				require.Len(t, c.Args, 3)
+				got = append(got, [2]float64{c.Args[0], c.Args[1]})
+			}
+
+			// Order is deterministic with our shift generation and tile iteration for margin=0: single tile.
+			require.ElementsMatch(t, tt.wantCenters, got)
+		})
+	}
+}