By default, the polygon is fill the way, but it can be changed to become WINDING. The difference between these two ways
The AlTernater mode can be imagined to draw in an infinite area, and only the imaginary line passes through the odd-numbered border line.
The WINDING way can also be imagined to draw in an infinite area, which although it will fill most of the closed areas, but if the imaginary line does not fill the graphic of the closed area if the imaginary line does not fill the blocked area.
In this case, it will cause all of the regions that may not be fully populated with both modes!