Where the anchor of the text is placed.
This is used by Text.anchor property.
| UpperLeft | Text is anchored in upper left corner. |
| UpperCenter | Text is anchored in upper side, centered horizontally. |
| UpperRight | Text is anchored in upper right corner. |
| MiddleLeft | Text is anchored in left side, centered vertically. |
| MiddleCenter | Text is centered both horizontally and vertically. |
| MiddleRight | Text is anchored in right side, centered vertically. |
| LowerLeft | Text is anchored in lower left corner. |
| LowerCenter | Text is anchored in lower side, centered horizontally. |
| LowerRight | Text is anchored in lower right corner. |