no-wrap option; pivoted exponential zoom

client/world/camera_clamp_test.go

@@ -0,0 +1,92 @@
+package world
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestClampCameraNoWrapViewport_ClampsToKeepViewportInsideWorld(t *testing.T) {
+	t.Parallel()
+
+	worldW := 100 * SCALE
+	worldH := 100 * SCALE
+	zoomFp := SCALE // 1.0x
+
+	// viewport 40px => span 40 units => half 20.
+	viewportW, viewportH := 40, 40
+
+	// Too far left/up => clamp to minCam=20
+	cx, cy := ClampCameraNoWrapViewport(
+		0, 0,
+		viewportW, viewportH,
+		zoomFp,
+		worldW, worldH,
+	)
+	require.Equal(t, 20*SCALE, cx)
+	require.Equal(t, 20*SCALE, cy)
+
+	// Too far right/down => clamp to maxCam=world-half=80
+	cx, cy = ClampCameraNoWrapViewport(
+		99*SCALE, 99*SCALE,
+		viewportW, viewportH,
+		zoomFp,
+		worldW, worldH,
+	)
+	require.Equal(t, 80*SCALE, cx)
+	require.Equal(t, 80*SCALE, cy)
+
+	// Inside range => unchanged
+	cx, cy = ClampCameraNoWrapViewport(
+		50*SCALE, 60*SCALE,
+		viewportW, viewportH,
+		zoomFp,
+		worldW, worldH,
+	)
+	require.Equal(t, 50*SCALE, cx)
+	require.Equal(t, 60*SCALE, cy)
+}
+
+func TestClampCameraNoWrapViewport_WhenViewportLargerThanWorld_ForcesCenter(t *testing.T) {
+	t.Parallel()
+
+	worldW := 50 * SCALE
+	worldH := 50 * SCALE
+	zoomFp := SCALE
+
+	// viewport 60px => span 60 units > world 50
+	viewportW, viewportH := 60, 60
+
+	cx, cy := ClampCameraNoWrapViewport(
+		0, 0,
+		viewportW, viewportH,
+		zoomFp,
+		worldW, worldH,
+	)
+
+	require.Equal(t, worldW/2, cx)
+	require.Equal(t, worldH/2, cy)
+}
+
+func TestWorldClampRenderParamsNoWrap_UsesViewportClamp(t *testing.T) {
+	t.Parallel()
+
+	w := NewWorld(100, 100)
+
+	p := RenderParams{
+		ViewportWidthPx:  40,
+		ViewportHeightPx: 40,
+		MarginXPx:        10,
+		MarginYPx:        10,
+		CameraZoom:       1.0,
+		CameraXWorldFp:   0,
+		CameraYWorldFp:   0,
+		Options:          &RenderOptions{DisableWrapScroll: true},
+	}
+
+	w.ClampRenderParamsNoWrap(&p)
+
+	// viewport half is 20, not 30 (margins ignored)
+	require.Equal(t, 20*SCALE, p.CameraXWorldFp)
+	require.Equal(t, 20*SCALE, p.CameraYWorldFp)
+}