Implement array boundaries access

1 files changed, 10 insertions, 2 deletions

diff --git a/src/main/java/Filter.java b/src/main/java/Filter.java
index ddc3e92..73b435b 100644
--- a/src/main/java/Filter.java
+++ b/src/main/java/Filter.java
@@ -13,8 +13,16 @@ public final class Filter {
      * @return nearest valid pixel color
      */
     public static float at(float[][] gray, int row, int col) {
-        // TODO at
-        return 0.0f;
+        int maxRow = gray.length - 1;
+        int maxCol = gray[0].length - 1;
+
+        if (row < 0) row = 0;
+        if (col < 0) col = 0;
+
+        if (row > maxRow) row = maxRow;
+        if (col > maxCol) col = maxCol;
+
+        return gray[row][col];
     }
 
     /**