Enum cairo_fill_rule_t
cairo_fill_rule_t
is used to select how paths are filled. For both
fill rules, whether or not a point is included in the fill is
determined by taking a ray from that point to infinity and looking
at intersections with the path. The ray can be in any direction,
as long as it doesn't pass through the end point of a segment
or have a tricky intersection such as intersecting tangent to the path.
(Note that filling is not actually implemented in this way. This
is just a description of the rule that is applied.)
The default fill rule is CAIRO_FILL_RULE_WINDING
.
New entries may be added in future versions.
The enum base type is
int
.
Enum members
Name | Description |
---|---|
CAIRO_FILL_RULE_EVEN_ODD
|
Counts the total number of intersections, without regard to the orientation of the contour. If the total number of intersections is odd, the point will be filled. |
CAIRO_FILL_RULE_WINDING
|
If the path crosses the ray from left-to-right, counts +1. If the path crosses the ray from right to left, counts -1. (Left and right are determined from the perspective of looking along the ray from the starting point.) If the total count is non-zero, the point will be filled. |
Authors
Johannes Pfau | cairoD |
cairo team | cairo |
Copyright
License
cairoD wrapper/bindings | Boost License 1.0 |
cairo | LGPL 2.1 / MPL 1.1 |