Add a squiggly line to the current path in the specified cairo context that approximately covers the given rectangle in the style of an underline used to indicate a spelling error.
The width of the underline is rounded to an integer number of up/down segments and the resulting rectangle is centered in the original rectangle.
| cr |
a Cairo context |
| x |
The X coordinate of one corner of the rectangle |
| y |
The Y coordinate of one corner of the rectangle |
| width |
Non-negative width of the rectangle |
| height |
Non-negative height of the rectangle |