diff --git a/Cargo.toml b/Cargo.toml
index 513aa15..e0efbc3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "i_float"
-version = "3.0.0"
+version = "4.0.0"
 authors = ["Nail Sharipov <nailxsharipov@gmail.com>"]
 edition = "2024"
 description = "This fixed float math library provides an efficient and deterministic solution for arithmetic and geometric operations."
diff --git a/src/adapter.rs b/src/adapter.rs
index 2a3cde1..7a130e4 100644
--- a/src/adapter.rs
+++ b/src/adapter.rs
@@ -115,17 +115,17 @@ impl<P: FloatPointCompatible, I: IntNumber> FloatPointAdapter<P, I> {
         rect: FloatRect<P::Scalar>,
         scale: P::Scalar,
     ) -> Result<Self, FloatPointAdapterScaleError> {
-        let scale_f64 = Self::validate_scale(scale)?;
+        let scale = Self::validate_scale(scale)?;
         let mut adapter = Self::new(rect);
 
-        let zero = P::Scalar::ZERO;
-        let is_degenerate = adapter.rect.width() == zero && adapter.rect.height() == zero;
+        let is_degenerate =
+            adapter.rect.width() == P::Scalar::ZERO && adapter.rect.height() == P::Scalar::ZERO;
         if !is_degenerate && adapter.dir_scale < scale {
             return Err(FloatPointAdapterScaleError::ScaleTooLarge);
         }
 
         adapter.dir_scale = scale;
-        adapter.inv_scale = P::Scalar::from_float(1.0 / scale_f64);
+        adapter.inv_scale = P::Scalar::ONE / scale;
         Ok(adapter)
     }
 
@@ -157,15 +157,14 @@ impl<P: FloatPointCompatible, I: IntNumber> FloatPointAdapter<P, I> {
     }
 
     #[inline]
-    fn validate_scale(scale: P::Scalar) -> Result<f64, FloatPointAdapterScaleError> {
-        let scale_f64 = scale.to_f64();
-        if !scale_f64.is_finite() {
+    fn validate_scale(scale: P::Scalar) -> Result<P::Scalar, FloatPointAdapterScaleError> {
+        if !scale.is_finite() {
             return Err(FloatPointAdapterScaleError::ScaleNotFinite);
         }
-        if scale_f64 <= 0.0 {
+        if scale <= P::Scalar::ZERO {
             return Err(FloatPointAdapterScaleError::ScaleNonPositive);
         }
-        Ok(scale_f64)
+        Ok(scale)
     }
 
     #[inline(always)]
@@ -248,7 +247,7 @@ impl<P: FloatPointCompatible, I: IntNumber> FloatPointAdapter<P, I> {
 
     #[inline(always)]
     pub fn try_float_to_int(&self, point: &P) -> Result<IntPoint<I>, FloatPointAdapterRangeError> {
-        if !self.rect.contains(point) {
+        if !point.is_finite() || !self.rect.contains(point) {
             return Err(FloatPointAdapterRangeError::PointOutOfRange);
         }
 
@@ -444,6 +443,21 @@ mod tests {
         );
     }
 
+    #[test]
+    fn test_try_float_to_int_not_finite() {
+        let adapter =
+            FloatPointAdapter::<[f64; 2], i32>::with_scale(FloatRect::new(-1.0, 1.0, -1.0, 1.0), 10.0);
+
+        assert_eq!(
+            adapter.try_float_to_int(&[f64::NAN, 0.0]).err().unwrap(),
+            FloatPointAdapterRangeError::PointOutOfRange
+        );
+        assert_eq!(
+            adapter.try_float_to_int(&[0.0, f64::INFINITY]).err().unwrap(),
+            FloatPointAdapterRangeError::PointOutOfRange
+        );
+    }
+
     #[test]
     fn test_try_int_to_float_range() {
         let adapter =
diff --git a/src/float/compatible.rs b/src/float/compatible.rs
index dfbd0e1..1889060 100644
--- a/src/float/compatible.rs
+++ b/src/float/compatible.rs
@@ -5,6 +5,11 @@ pub trait FloatPointCompatible: Copy {
     fn from_xy(x: Self::Scalar, y: Self::Scalar) -> Self;
     fn x(&self) -> Self::Scalar;
     fn y(&self) -> Self::Scalar;
+
+    #[inline(always)]
+    fn is_finite(&self) -> bool {
+        self.x().is_finite() && self.y().is_finite()
+    }
 }
 
 impl<T: FloatNumber> FloatPointCompatible for [T; 2] {
@@ -39,4 +44,11 @@ mod tests {
 
         assert_eq!(a0, a1);
     }
+
+    #[test]
+    fn test_is_finite() {
+        assert!([2.0, 5.0].is_finite());
+        assert!(![f64::NAN, 5.0].is_finite());
+        assert!(![2.0, f64::INFINITY].is_finite());
+    }
 }
diff --git a/src/float/number.rs b/src/float/number.rs
index 0bee7af..6320397 100644
--- a/src/float/number.rs
+++ b/src/float/number.rs
@@ -21,6 +21,7 @@ where
     const ONE: Self;
     const TWO: Self;
     const THREE: Self;
+    const FOUR: Self;
     const HALF: Self;
 
     // Construction.
@@ -42,6 +43,7 @@ where
     fn acos(self) -> Self;
     fn asin(self) -> Self;
     fn signum(self) -> Self;
+    fn is_finite(self) -> bool;
     // Truncating casts.
     fn to_i16(self) -> i16;
     fn to_i32(self) -> i32;
@@ -66,6 +68,7 @@ impl FloatNumber for f32 {
     const ONE: Self = 1.0;
     const TWO: Self = 2.0;
     const THREE: Self = 3.0;
+    const FOUR: Self = 4.0;
     const HALF: Self = 0.5;
 
     // Construction.
@@ -150,6 +153,11 @@ impl FloatNumber for f32 {
         self.signum()
     }
 
+    #[inline(always)]
+    fn is_finite(self) -> bool {
+        self.is_finite()
+    }
+
     // Truncating casts.
     #[inline(always)]
     fn to_i16(self) -> i16 {
@@ -216,6 +224,7 @@ impl FloatNumber for f64 {
     const ONE: Self = 1.0;
     const TWO: Self = 2.0;
     const THREE: Self = 3.0;
+    const FOUR: Self = 4.0;
     const HALF: Self = 0.5;
     // Construction.
     #[inline(always)]
@@ -299,6 +308,11 @@ impl FloatNumber for f64 {
         self.signum()
     }
 
+    #[inline(always)]
+    fn is_finite(self) -> bool {
+        self.is_finite()
+    }
+
     // Truncating casts.
     #[inline(always)]
     fn to_i16(self) -> i16 {