feat(api): add support for x_center, y_center, and anchor_point in overlay positioning

Author: manu4543

lib/imagekitio/helpers/helper.rb

@@ -635,11 +635,17 @@ def add_overlay_properties(parts, overlay)
       if position
         x = safe_get(position, :x)
         y = safe_get(position, :y_)
+        x_center = safe_get(position, :x_center)
+        y_center = safe_get(position, :y_center)
         focus = safe_get(position, :focus)
+        anchor_point = safe_get(position, :anchor_point)
 
         parts << "lx-#{x}" if x
         parts << "ly-#{y}" if y
+        parts << "lxc-#{x_center}" if x_center
+        parts << "lyc-#{y_center}" if y_center
         parts << "lfo-#{focus}" if focus
+        parts << "lap-#{anchor_point}" if anchor_point
       end
 
       # Add timing properties

test/imagekitio/custom-tests/url-generation/overlay_test.rb

@@ -856,4 +856,32 @@ def test_should_work_with_plain_hashes_for_text_overlay
     expected = "https://ik.imagekit.io/test_url_endpoint/tr:w-300,h-200,l-text,i-Hello%20World,lx-10,ly-20,lfo-center,fs-20,co-FF0000,l-end/base-image.jpg"
     assert_equal(expected, url)
   end
+
+  # Test for x_center, y_center, and anchor_point
+  def test_should_generate_url_with_overlay_using_xcenter_ycenter_and_anchorpoint
+    # Using hash format to avoid type conversion issues with arithmetic expressions
+    url = @client.helper.build_url(
+      {
+        src: "/base-image.jpg",
+        url_endpoint: "https://ik.imagekit.io/test_url_endpoint",
+        transformation_position: :path,
+        transformation: [
+          {
+            overlay: {
+              type: :image,
+              input: "logo.png",
+              position: {
+                x_center: "bw_mul_0.5",
+                y_center: "bh_mul_0.5",
+                anchor_point: :top_left
+              }
+            }
+          }
+        ]
+      }
+    )
+
+    expected = "https://ik.imagekit.io/test_url_endpoint/tr:l-image,i-logo.png,lxc-bw_mul_0.5,lyc-bh_mul_0.5,lap-top_left,l-end/base-image.jpg"
+    assert_equal(expected, url)
+  end
 end