Fill method to be used by the Image.
See Also: Image.fillMethod.
| Horizontal | The Image will be filled Horizontally. |
| Vertical | The Image will be filled Vertically. |
| Radial90 | The Image will be filled Radially with the radial center in one of the corners. |
| Radial180 | The Image will be filled Radially with the radial center in one of the edges. |
| Radial360 | The Image will be filled Radially with the radial center at the center. |