diff --git a/crates/cxx-qt-lib/src/core/qline.rs b/crates/cxx-qt-lib/src/core/qline.rs
index 4696cc096..88ff38e78 100644
--- a/crates/cxx-qt-lib/src/core/qline.rs
+++ b/crates/cxx-qt-lib/src/core/qline.rs
@@ -5,6 +5,7 @@
 
 use crate::QPoint;
 use cxx::{type_id, ExternType};
+use std::fmt;
 
 #[cxx::bridge]
 mod ffi {
@@ -13,6 +14,8 @@ mod ffi {
         type QLine = super::QLine;
         include!("cxx-qt-lib/qpoint.h");
         type QPoint = crate::QPoint;
+        include!("cxx-qt-lib/qstring.h");
+        type QString = crate::QString;
 
         /// Returns the line's start point.
         fn p1(self: &QLine) -> QPoint;
@@ -79,6 +82,10 @@ mod ffi {
         #[doc(hidden)]
         #[rust_name = "qline_new"]
         fn construct(pt1: QPoint, pt2: QPoint) -> QLine;
+
+        #[doc(hidden)]
+        #[rust_name = "qline_to_qstring"]
+        fn toQString(value: &QLine) -> QString;
     }
 }
 
@@ -104,6 +111,12 @@ impl Default for QLine {
     }
 }
 
+impl fmt::Display for QLine {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", ffi::qline_to_qstring(self))
+    }
+}
+
 // Safety:
 //
 // Static checks on the C++ side ensure that QLine is trivial.
diff --git a/crates/cxx-qt-lib/src/core/qlinef.rs b/crates/cxx-qt-lib/src/core/qlinef.rs
index 80fbae9bb..9bad40878 100644
--- a/crates/cxx-qt-lib/src/core/qlinef.rs
+++ b/crates/cxx-qt-lib/src/core/qlinef.rs
@@ -6,6 +6,7 @@
 use crate::QLine;
 use crate::QPointF;
 use cxx::{type_id, ExternType};
+use std::fmt;
 
 #[cxx::bridge]
 mod ffi {
@@ -16,6 +17,8 @@ mod ffi {
         type QLine = crate::QLine;
         include!("cxx-qt-lib/qpointf.h");
         type QPointF = crate::QPointF;
+        include!("cxx-qt-lib/qstring.h");
+        type QString = crate::QString;
 
         /// Returns the angle of the line in degrees.
         fn angle(self: &QLineF) -> f64;
@@ -121,6 +124,10 @@ mod ffi {
         #[doc(hidden)]
         #[rust_name = "qlinef_from_qline"]
         fn construct(line: &QLine) -> QLineF;
+
+        #[doc(hidden)]
+        #[rust_name = "qlinef_to_qstring"]
+        fn toQString(value: &QLineF) -> QString;
     }
 }
 
@@ -161,6 +168,12 @@ impl From<QLineF> for ffi::QLine {
     }
 }
 
+impl fmt::Display for QLineF {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", ffi::qlinef_to_qstring(self))
+    }
+}
+
 // Safety:
 //
 // Static checks on the C++ side ensure that QLineF is trivial.
diff --git a/crates/cxx-qt-lib/src/gui/qpen.rs b/crates/cxx-qt-lib/src/gui/qpen.rs
index 1ddc6fc8d..131707d8e 100644
--- a/crates/cxx-qt-lib/src/gui/qpen.rs
+++ b/crates/cxx-qt-lib/src/gui/qpen.rs
@@ -3,6 +3,7 @@
 //
 // SPDX-License-Identifier: MIT OR Apache-2.0
 use cxx::{type_id, ExternType};
+use std::fmt;
 use std::mem::MaybeUninit;
 
 #[cxx::bridge]
@@ -20,6 +21,8 @@ mod ffi {
         type QPen = super::QPen;
         include!("cxx-qt-lib/qcolor.h");
         type QColor = crate::QColor;
+        include!("cxx-qt-lib/qstring.h");
+        type QString = crate::QString;
 
         /// Returns the pen's cap style.
         #[rust_name = "cap_style"]
@@ -117,6 +120,10 @@ mod ffi {
         #[doc(hidden)]
         #[rust_name = "qpen_eq"]
         fn operatorEq(a: &QPen, b: &QPen) -> bool;
+
+        #[doc(hidden)]
+        #[rust_name = "qpen_to_qstring"]
+        fn toQString(value: &QPen) -> QString;
     }
 }
 
@@ -167,6 +174,12 @@ impl From<&ffi::PenStyle> for QPen {
     }
 }
 
+impl fmt::Display for QPen {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", ffi::qpen_to_qstring(self))
+    }
+}
+
 // Safety:
 //
 // Static checks on the C++ side to ensure the size is the same.