diff --git a/engine/src/engine.rs b/engine/src/engine.rs
index 4371e7e6..886f9670 100644
--- a/engine/src/engine.rs
+++ b/engine/src/engine.rs
@@ -128,15 +128,15 @@ pub trait Area<N: Coordinate> {
     }
     #[inline] fn center_x (&self, n: N) -> [N;4] {
         let [x, y, w, h] = self.xywh();
-        [x + w / 2.into() - n, y + h / 2.into(), n, 1.into()]
+        [(x + w / 2.into()).minus(n / 2.into()), y + h / 2.into(), n, 1.into()]
     }
     #[inline] fn center_y (&self, m: N) -> [N;4] {
         let [x, y, w, h] = self.xywh();
-        [x + w / 2.into(), y + h / 2.into() - m, 1.into(), m]
+        [x + w / 2.into(), (y + h / 2.into()).minus(m / 2.into()), 1.into(), m]
     }
     #[inline] fn center_xy (&self, [n, m]: [N;2]) -> [N;4] {
         let [x, y, w, h] = self.xywh();
-        [x + w / 2.into() - n, y + h / 2.into() - n - m, n, m]
+        [(x + w / 2.into()).minus(n / 2.into()), (y + h / 2.into()).minus(m / 2.into()), n, m]
     }
     #[inline] fn centered (&self) -> [N;2] {
         [self.x().minus(self.w()/2.into()), self.y().minus(self.h()/2.into())]
diff --git a/engine/src/tui/tui_output.rs b/engine/src/tui/tui_output.rs
index 387cc5dd..876bad8d 100644
--- a/engine/src/tui/tui_output.rs
+++ b/engine/src/tui/tui_output.rs
@@ -71,7 +71,7 @@ impl TuiOut {
 
 impl Content<Tui> for &str {
     fn layout (&self, to: [u16;4]) -> [u16;4] {
-        to.center_x(self.chars().count() as u16)
+        to.center_xy([self.chars().count() as u16, 1])
     }
     fn render (&self, to: &mut TuiOut) {
         to.blit(self, to.area.x(), to.area.y(), None)
@@ -80,7 +80,7 @@ impl Content<Tui> for &str {
 
 impl Content<Tui> for String {
     fn layout (&self, to: [u16;4]) -> [u16;4] {
-        to.center_x(self.chars().count() as u16)
+        to.center_xy([self.chars().count() as u16, 1])
     }
     fn render (&self, to: &mut TuiOut) {
         to.blit(self, to.area.x(), to.area.y(), None)
diff --git a/layout/src/lib.rs b/layout/src/lib.rs
index 72b180bc..e57aee7d 100644
--- a/layout/src/lib.rs
+++ b/layout/src/lib.rs
@@ -13,18 +13,18 @@ pub(crate) use std::marker::PhantomData;
 
 #[cfg(test)] #[test] fn test_layout () -> Usually<()> {
     use crate::tui::Tui;
-
     let area: [u16;4] = [10, 10, 20, 20];
-    let unit = ();
-
-    assert_eq!(Content::<Tui>::layout(&unit, area), [20, 20, 0, 0]);
-
-    assert_eq!(Fill::<Tui, _>::x(unit).layout(area), [10, 20, 20, 0]);
-    assert_eq!(Fill::<Tui, _>::y(unit).layout(area), [20, 10, 0, 20]);
-    assert_eq!(Fill::<Tui, _>::xy(unit).layout(area), area);
-
-    assert_eq!(Align::<Tui, _>::c(unit).layout(area), [20, 20, 0, 0]);
-    assert_eq!(Align::<Tui, _>::c("  ").layout(area), [20, 20, 0, 0]);
-
+    assert_eq!(Content::<Tui>::layout(&(), area),
+        [20, 20, 0, 0]);
+    assert_eq!(Fill::<Tui, _>::x(()).layout(area),
+        [10, 20, 20, 0]);
+    assert_eq!(Fill::<Tui, _>::y(()).layout(area),
+        [20, 10, 0, 20]);
+    assert_eq!(Fill::<Tui, _>::xy(()).layout(area),
+        area);
+    assert_eq!(Fixed::<Tui, _>::xy(4, 4, ()).layout(area),
+        [18, 18, 4, 4]);
+    assert_eq!(Align::<Tui, _>::c(()).layout(area),
+        [20, 20, 0, 0]);
     Ok(())
 }
diff --git a/layout/src/transform_xy_unit.rs b/layout/src/transform_xy_unit.rs
index e2149d8d..435fbf09 100644
--- a/layout/src/transform_xy_unit.rs
+++ b/layout/src/transform_xy_unit.rs
@@ -42,23 +42,25 @@ macro_rules! transform_xy_unit {
 }
 
 transform_xy_unit!(|self: Fixed, area|{
-    let area = self.content().layout(area);
+    let [x, y, w, h] = self.content().layout(area.center_xy(match self {
+        Self::X(fw, _) => [*fw, area.h()],
+        Self::Y(fh, _) => [area.w(), *fh],
+        Self::XY(fw, fh, _) => [*fw, *fh],
+    }).into()).xywh();
     match self {
-        Self::X(fw, _) => [area.x(), area.y(), *fw, area.h()],
-        Self::Y(fh, _) => [area.x(), area.y(), area.w(), *fh],
-        Self::XY(fw, fh, _) => [area.x(), area.y(), *fw, *fh], // tagn
+        Self::X(fw, _) => [x, y, *fw, h],
+        Self::Y(fh, _) => [x, y, w, *fh],
+        Self::XY(fw, fh, _) => [x, y, *fw, *fh],
     }
 });
 
-transform_xy_unit!(|self: Shrink, area|{
-    let area = self.content().layout(area);
-    [area.x(), area.y(), area.w().minus(self.dx()), area.h().minus(self.dy())]
-});
+transform_xy_unit!(|self: Shrink, area|self.content().layout([
+    area.x(), area.y(), area.w().minus(self.dx()), area.h().minus(self.dy())
+].into()));
 
-transform_xy_unit!(|self: Expand, area|{
-    let area = self.content().layout(area);
-    [area.x(), area.y(), area.w() + self.dx(), area.h() + self.dy()]
-});
+transform_xy_unit!(|self: Expand, area|self.content().layout([
+    area.x(), area.y(), area.w() + self.dx(), area.h() + self.dy()
+].into()));
 
 transform_xy_unit!(|self: Min, area|{
     let area = self.content().layout(area);