ElementIsWindingFill Method |
Checks if is winding fill.
Namespace:
pdftron.PDF
Assembly:
pdftron (in pdftron.dll) Version: 255.255.255.255
Syntax public bool IsWindingFill()
Public Function IsWindingFill As Boolean
public:
virtual bool IsWindingFill() sealed
function IsWindingFill();
Return Value
Type:
Boolean true if the current path should be filled using non-zero winding rule,
or false if the path should be filled using even-odd rule.
According non-zero winding rule, you can determine whether a test point is inside or
outside a closed curve as follows: Draw a line from a test point to a point that
is distant from the curve. Count the number of times the curve crosses the test
line from left to right, and count the number of times the curve crosses the test
line from right to left. If those two numbers are the same, the test point is
outside the curve; otherwise, the test point is inside the curve.
According to even-odd rule, you can determine whether a test point is inside
or outside a closed curve as follows: Draw a line from the test point to a point
that is distant from the curve. If that line crosses the curve an odd number of
times, the test point is inside the curve; otherwise, the test point is outside
the curve.
See Also