diff --git a/pagecurl/src/main/kotlin/eu/wewox/pagecurl/page/CurlDraw.kt b/pagecurl/src/main/kotlin/eu/wewox/pagecurl/page/CurlDraw.kt
index d36af07..2ef52c1 100644
--- a/pagecurl/src/main/kotlin/eu/wewox/pagecurl/page/CurlDraw.kt
+++ b/pagecurl/src/main/kotlin/eu/wewox/pagecurl/page/CurlDraw.kt
@@ -28,7 +28,7 @@ import java.lang.Float.max
 import kotlin.math.atan2
 
 @ExperimentalPageCurlApi
-public fun Modifier.drawCurl(
+internal fun Modifier.drawCurl(
     config: CurlConfig = CurlConfig(),
     posA: Offset,
     posB: Offset,
diff --git a/pagecurl/src/main/kotlin/eu/wewox/pagecurl/page/CurlGesture.kt b/pagecurl/src/main/kotlin/eu/wewox/pagecurl/page/CurlGesture.kt
index e156e38..28b0d74 100644
--- a/pagecurl/src/main/kotlin/eu/wewox/pagecurl/page/CurlGesture.kt
+++ b/pagecurl/src/main/kotlin/eu/wewox/pagecurl/page/CurlGesture.kt
@@ -18,7 +18,7 @@ import eu.wewox.pagecurl.utils.rotate
 import kotlin.math.PI
 
 @ExperimentalPageCurlApi
-public fun Modifier.curlGesture(
+internal fun Modifier.curlGesture(
     enabled: Boolean,
     direction: CurlDirection,
     onStart: () -> Unit,
diff --git a/pagecurl/src/main/kotlin/eu/wewox/pagecurl/utils/MathUtils.kt b/pagecurl/src/main/kotlin/eu/wewox/pagecurl/utils/MathUtils.kt
index 0bd9bcc..e2bf793 100644
--- a/pagecurl/src/main/kotlin/eu/wewox/pagecurl/utils/MathUtils.kt
+++ b/pagecurl/src/main/kotlin/eu/wewox/pagecurl/utils/MathUtils.kt
@@ -1,53 +1,9 @@
 package eu.wewox.pagecurl.utils
 
 import androidx.compose.ui.geometry.Offset
-import androidx.compose.ui.graphics.Path
 import kotlin.math.cos
 import kotlin.math.sin
 
-internal data class Polygon(val vertices: List<Offset>) {
-
-    private val size: Int = vertices.size
-
-    fun translate(offset: Offset): Polygon =
-        Polygon(vertices.map { it + offset })
-
-    fun offset(value: Float): Polygon {
-        val edgeNormals = List(size) {
-            val edge = vertices[index(it + 1)] - vertices[index(it)]
-            Offset(edge.y, -edge.x).normalized()
-        }
-
-        val vertexNormals = List(size) {
-            (edgeNormals[index(it - 1)] + edgeNormals[index(it)]).normalized()
-        }
-
-        return Polygon(
-            vertices.mapIndexed { index, vertex ->
-                vertex + vertexNormals[index] * value
-            }
-        )
-    }
-
-    fun toPath(): Path =
-        Path().apply {
-            vertices.forEachIndexed { index, vertex ->
-                if (index == 0) {
-                    moveTo(vertex.x, vertex.y)
-                } else {
-                    lineTo(vertex.x, vertex.y)
-                }
-            }
-        }
-
-    private fun index(i: Int) = ((i % size) + size) % size
-}
-
-private fun Offset.normalized(): Offset {
-    val distance = getDistance()
-    return if (distance != 0f) this / distance else this
-}
-
 internal fun Offset.rotate(angle: Float): Offset {
     val sin = sin(angle)
     val cos = cos(angle)
@@ -64,8 +20,8 @@ internal fun lineLineIntersection(
     if (denominator == 0f) return null
 
     val x = ((line1a.x * line1b.y - line1a.y * line1b.x) * (line2a.x - line2b.x) -
-            (line1a.x - line1b.x) * (line2a.x * line2b.y - line2a.y * line2b.x)) / denominator
+        (line1a.x - line1b.x) * (line2a.x * line2b.y - line2a.y * line2b.x)) / denominator
     val y = ((line1a.x * line1b.y - line1a.y * line1b.x) * (line2a.y - line2b.y) -
-            (line1a.y - line1b.y) * (line2a.x * line2b.y - line2a.y * line2b.x)) / denominator
+        (line1a.y - line1b.y) * (line2a.x * line2b.y - line2a.y * line2b.x)) / denominator
     return Offset(x, y)
 }
diff --git a/pagecurl/src/main/kotlin/eu/wewox/pagecurl/utils/Polygon.kt b/pagecurl/src/main/kotlin/eu/wewox/pagecurl/utils/Polygon.kt
new file mode 100644
index 0000000..4cd7087
--- /dev/null
+++ b/pagecurl/src/main/kotlin/eu/wewox/pagecurl/utils/Polygon.kt
@@ -0,0 +1,47 @@
+package eu.wewox.pagecurl.utils
+
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.graphics.Path
+
+internal data class Polygon(val vertices: List<Offset>) {
+
+    private val size: Int = vertices.size
+
+    fun translate(offset: Offset): Polygon =
+        Polygon(vertices.map { it + offset })
+
+    fun offset(value: Float): Polygon {
+        val edgeNormals = List(size) {
+            val edge = vertices[index(it + 1)] - vertices[index(it)]
+            Offset(edge.y, -edge.x).normalized()
+        }
+
+        val vertexNormals = List(size) {
+            (edgeNormals[index(it - 1)] + edgeNormals[index(it)]).normalized()
+        }
+
+        return Polygon(
+            vertices.mapIndexed { index, vertex ->
+                vertex + vertexNormals[index] * value
+            }
+        )
+    }
+
+    fun toPath(): Path =
+        Path().apply {
+            vertices.forEachIndexed { index, vertex ->
+                if (index == 0) {
+                    moveTo(vertex.x, vertex.y)
+                } else {
+                    lineTo(vertex.x, vertex.y)
+                }
+            }
+        }
+
+    private fun index(i: Int) = ((i % size) + size) % size
+}
+
+private fun Offset.normalized(): Offset {
+    val distance = getDistance()
+    return if (distance != 0f) this / distance else this
+}