Add more debug output

Author: pavoljurov

src/DiagramGenerator/Image/Image.php

@@ -75,6 +75,11 @@ function (Font $font) {
                 $font->valign('top');
             }
         );
+        
+        // Draw red circle at (10, 10) for verification - after caption
+        $gdResource = $this->image->getCore();
+        $red = imagecolorallocate($gdResource, 255, 0, 0);
+        imagefilledellipse($gdResource, 10, 10, 10, 10, $red);
     }
 
     /**
@@ -151,6 +156,11 @@ public function drawBoardWithFigures(Fen $fen, $cellSize, $topPaddingOfCell)
         );
 
         $this->drawFigures($fen, $this->config, $topPaddingOfCell);
+        
+        // Draw red circle at (10, 10) for verification - last thing after all drawing
+        $gdResource = $this->image->getCore();
+        $red = imagecolorallocate($gdResource, 255, 0, 0);
+        imagefilledellipse($gdResource, 10, 10, 10, 10, $red);
     }
 
     /**