anchor.diff:            // Add a rectangle (two triangles).
             int index = y * 4 + x;
   
  -          _indicies.add(index);
  -          _indicies.add(index + 1);
  -          _indicies.add(index + 4);
  +          _indices.add(index);
  +          _indices.add(index + 1);
  +          _indices.add(index + 4);
   
  -          _indicies.add(index + 1);
  -          _indicies.add(index + 5);
  -          _indicies.add(index + 4);
  +          _indices.add(index + 1);
  +          _indices.add(index + 5);
  +          _indices.add(index + 4);
           }
         }
       }
  
positive.code:   List<Point> _vertices;
    List<Point> _textureCoordinates;
    List<Color> _colors;
    List<int> _indicies;
  
    @override
    void paint(Canvas canvas) {
  
negative.code:       _textureCoordinates,
        _colors,
        TransferMode.modulate,
        _indices,
        _cachedPaint
      );
    }
  