diff --git a/Tools/dora-rust/dora-test/src/tests/contact.rs b/Tools/dora-rust/dora-test/src/tests/contact.rs
index f742e30a8..d35c41243 100644
--- a/Tools/dora-rust/dora-test/src/tests/contact.rs
+++ b/Tools/dora-rust/dora-test/src/tests/contact.rs
@@ -15,8 +15,8 @@ pub fn test() {
 	let radius = 300.0;
 	let mut vertices = vec![];
 	for i in 0..=count {
-		let angle = 2.0 * std::f32::consts::PI * i as f32 / count as f32;
-		vertices.push(Vec2::new(radius * angle.cos(), radius * angle.sin()));
+		let angle = 2.0 * Math::PI * i as f32 / count as f32;
+		vertices.push(Vec2::new(radius * Math::cos(angle), radius * Math::sin(angle)));
 	}
 	terrain_def.attach_chain(&vertices, 0.4, 0.0);
 	terrain_def.attach_disk_with_center(&Vec2::new(0.0, -270.0), 30.0, 1.0, 0.0, 1.0);
diff --git a/Tools/dora-rust/dora-test/src/tests/entity_move.rs b/Tools/dora-rust/dora-test/src/tests/entity_move.rs
index 1272300fe..c5e2c58eb 100644
--- a/Tools/dora-rust/dora-test/src/tests/entity_move.rs
+++ b/Tools/dora-rust/dora-test/src/tests/entity_move.rs
@@ -31,8 +31,9 @@ pub fn test() {
 			get_scene()
 		) {
 			if let Some(mut sprite) = Sprite::with_file(&image) {
+				sprite.set_size(&Size::new(300.0, 300.0));
 				sprite.add_to(&scene);
-				sprite.run_action_def(ActionDef::scale(0.5, 0.0, 0.5, EaseType::OutBack), false);
+				sprite.run_action_def(ActionDef::scale(0.5, 0.0, 1.0, EaseType::OutBack), false);
 				entity.set("sprite", sprite.obj());
 			}
 		}
@@ -73,7 +74,7 @@ pub fn test() {
 				return false;
 			}
 			let dir = (target - position).normalize();
-			let angle = dir.x.atan2(dir.y).to_degrees();
+			let angle = Math::deg(Math::atan2(dir.x, dir.y));
 			let new_pos = position + dir * speed;
 			let new_pos = new_pos.clamp(&position, &target);
 			entity.set("position", new_pos);
@@ -162,7 +163,7 @@ pub fn test() {
 					if let Some(mut sprite) = get_sprite(&entity) {
 						sprite.run_action_def(
 							ActionDef::sequence(&vec![
-								ActionDef::scale(0.5, 0.5, 0.0, EaseType::InBack),
+								ActionDef::scale(0.5, 1.0, 0.0, EaseType::InBack),
 								ActionDef::event("Destroy", "")
 							]), false);
 						sprite.slot("Destroy", Box::new(move |_| {
diff --git a/Tools/dora-rust/dora/src/dora.rs b/Tools/dora-rust/dora/src/dora.rs
index 80124937d..f5e538902 100644
--- a/Tools/dora-rust/dora/src/dora.rs
+++ b/Tools/dora-rust/dora/src/dora.rs
@@ -5702,6 +5702,81 @@ impl Nvg {
 	}
 }
 
+// math
+
+extern "C" {
+	fn math_abs(v: f64) -> f64;
+	fn math_acos(v: f32) -> f32;
+	fn math_asin(v: f32) -> f32;
+	fn math_atan(v: f32) -> f32;
+	fn math_atan2(y: f32, x: f32) -> f32;
+	fn math_ceil(v: f32) -> f32;
+	fn math_cos(v: f32) -> f32;
+	fn math_deg(v: f32) -> f32;
+	fn math_exp(v: f32) -> f32;
+	fn math_floor(v: f32) -> f32;
+	fn math_fmod(x: f32, y: f32) -> f32;
+	fn math_log(v: f32) -> f32;
+	fn math_rad(v: f32) -> f32;
+	fn math_sin(v: f32) -> f32;
+	fn math_sqrt(v: f32) -> f32;
+	fn math_tan(v: f32) -> f32;
+}
+
+pub struct Math {}
+
+impl Math {
+	pub const PI: f32 = std::f32::consts::PI;
+	pub fn abs(v: f64) -> f64 {
+		unsafe { math_abs(v) }
+	}
+	pub fn acos(v: f32) -> f32 {
+		unsafe { math_acos(v) }
+	}
+	pub fn asin(v: f32) -> f32 {
+		unsafe { math_asin(v) }
+	}
+	pub fn atan(v: f32) -> f32 {
+		unsafe { math_atan(v) }
+	}
+	pub fn atan2(y: f32, x: f32) -> f32 {
+		unsafe { math_atan2(y, x) }
+	}
+	pub fn ceil(v: f32) -> f32 {
+		unsafe { math_ceil(v) }
+	}
+	pub fn cos(v: f32) -> f32 {
+		unsafe { math_cos(v) }
+	}
+	pub fn deg(v: f32) -> f32 {
+		unsafe { math_deg(v) }
+	}
+	pub fn exp(v: f32) -> f32 {
+		unsafe { math_exp(v) }
+	}
+	pub fn floor(v: f32) -> f32 {
+		unsafe { math_floor(v) }
+	}
+	pub fn fmod(x: f32, y: f32) -> f32 {
+		unsafe { math_fmod(x, y) }
+	}
+	pub fn log(v: f32) -> f32 {
+		unsafe { math_log(v) }
+	}
+	pub fn rad(v: f32) -> f32 {
+		unsafe { math_rad(v) }
+	}
+	pub fn sin(v: f32) -> f32 {
+		unsafe { math_sin(v) }
+	}
+	pub fn sqrt(v: f32) -> f32 {
+		unsafe { math_sqrt(v) }
+	}
+	pub fn tan(v: f32) -> f32 {
+		unsafe { math_tan(v) }
+	}
+}
+
 use std::future::Future;
 use std::pin::Pin;
 use std::task::{Context, Poll};