diff --git a/app/src/main/java/com/mirenkov/ktheightmap/MainActivity.kt b/app/src/main/java/com/mirenkov/ktheightmap/MainActivity.kt
index e2c31f1..7ddf23e 100644
--- a/app/src/main/java/com/mirenkov/ktheightmap/MainActivity.kt
+++ b/app/src/main/java/com/mirenkov/ktheightmap/MainActivity.kt
@@ -5,12 +5,6 @@ import android.util.Log
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
-import androidx.compose.foundation.Canvas
-import androidx.compose.foundation.clickable
-import androidx.compose.foundation.gestures.Orientation
-import androidx.compose.foundation.gestures.detectDragGestures
-import androidx.compose.foundation.gestures.draggable
-import androidx.compose.foundation.gestures.rememberDraggableState
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.padding
@@ -19,26 +13,18 @@ import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Build
 import androidx.compose.material3.FloatingActionButton
 import androidx.compose.material3.Icon
-import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.MaterialTheme.colorScheme
 import androidx.compose.material3.Scaffold
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.mutableFloatStateOf
-import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.geometry.Offset
-import androidx.compose.ui.geometry.Size
-import androidx.compose.ui.graphics.Color
-import androidx.compose.ui.graphics.drawscope.Stroke
-import androidx.compose.ui.input.pointer.pointerInput
 import androidx.compose.ui.tooling.preview.Preview
 import com.mirenkov.ktheightmap.ui.theme.KtHeightMapTheme
 
 const val TAG = "KtHeightMap"
-const val TILE_SIZE: Float = 128F
+const val TILE_SIZE: Float = 256F
 
 class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -64,51 +50,6 @@ class MainActivity : ComponentActivity() {
     }
 }
 
-@Composable
-fun MapCanvas(
-    backColor: Color,
-    gridColor: Color,
-    modifier: Modifier = Modifier
-) {
-    val offsetX = rememberSaveable { mutableFloatStateOf(0F) }
-    val offsetY = rememberSaveable { mutableFloatStateOf(0F) }
-    Canvas(
-        modifier = modifier.fillMaxSize()
-            .pointerInput(Unit) {
-                detectDragGestures { _, distance ->
-                    offsetX.floatValue += distance.x
-                    offsetY.floatValue += distance.y
-                }
-            }
-    ) {
-        drawRect(
-            color = backColor,
-            size = size
-        )
-
-
-        val strippedOffsetX = offsetX.floatValue % TILE_SIZE
-        val strippedOffsetY = offsetY.floatValue % TILE_SIZE
-
-        val offset = Offset(strippedOffsetX, strippedOffsetY)
-        val grid = size / TILE_SIZE
-        val gridWidth = grid.width.toInt()
-        val gridHeight = grid.height.toInt()
-        for (cellX in 0 .. gridWidth + 1) {
-            val offsetX = TILE_SIZE * (cellX - 1)
-            for (cellY in 0 .. gridHeight + 1) {
-                val offsetY = TILE_SIZE * (cellY - 1)
-                drawRect(
-                    color = gridColor,
-                    size = Size(TILE_SIZE, TILE_SIZE),
-                    topLeft = offset + Offset(offsetX, offsetY),
-                    style = Stroke(width = 4F)
-                )
-            }
-        }
-    }
-}
-
 @Composable
 fun ToolButton() {
     FloatingActionButton(
diff --git a/app/src/main/java/com/mirenkov/ktheightmap/MapCanvas.kt b/app/src/main/java/com/mirenkov/ktheightmap/MapCanvas.kt
new file mode 100644
index 0000000..110de11
--- /dev/null
+++ b/app/src/main/java/com/mirenkov/ktheightmap/MapCanvas.kt
@@ -0,0 +1,59 @@
+package com.mirenkov.ktheightmap
+
+import androidx.compose.foundation.Canvas
+import androidx.compose.foundation.gestures.detectDragGestures
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.mutableFloatStateOf
+import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.geometry.Size
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.drawscope.Stroke
+import androidx.compose.ui.input.pointer.pointerInput
+
+@Composable
+fun MapCanvas(
+    backColor: Color,
+    gridColor: Color,
+    modifier: Modifier = Modifier
+) {
+    val offsetX = rememberSaveable { mutableFloatStateOf(0F) }
+    val offsetY = rememberSaveable { mutableFloatStateOf(0F) }
+    Canvas(
+        modifier = modifier.fillMaxSize()
+            .pointerInput(Unit) {
+                detectDragGestures { _, distance ->
+                    offsetX.floatValue += distance.x
+                    offsetY.floatValue += distance.y
+                }
+            }
+    ) {
+        drawRect(
+            color = backColor,
+            size = size
+        )
+
+
+        val strippedOffsetX = offsetX.floatValue % TILE_SIZE
+        val strippedOffsetY = offsetY.floatValue % TILE_SIZE
+
+        val offset = Offset(strippedOffsetX, strippedOffsetY)
+        val grid = size / TILE_SIZE
+        val gridWidth = grid.width.toInt()
+        val gridHeight = grid.height.toInt()
+        for (cellX in 0 .. gridWidth + 2) {
+            val offsetX = TILE_SIZE * (cellX - 1)
+            for (cellY in 0 .. gridHeight + 2) {
+                val offsetY = TILE_SIZE * (cellY - 1)
+                drawRect(
+                    color = gridColor,
+                    size = Size(TILE_SIZE, TILE_SIZE),
+                    topLeft = offset + Offset(offsetX, offsetY),
+                    style = Stroke(width = 4F)
+                )
+            }
+        }
+    }
+}
\ No newline at end of file