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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| Yes
| Import Library
| gdi32.lib
| Header File
| wingdi.h
| Unicode
| No
| Platform Notes
| Windows 95: int == 16 bits
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SetPolyFillMode
The SetPolyFillMode function sets the polygon fill mode for functions that fill polygons.
int SetPolyFillMode(
HDC hdc,
| // handle of device context
| int iPolyFillMode
| // polygon fill mode
| );
|
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Parameters
hdc
Identifies the device context.
iPolyFillMode
Specifies the new fill mode. This parameter can be either of the following
values:
Value
| Meaning
| ALTERNATE
| Selects alternate mode (fills the area between odd-numbered and even-numbered
polygon sides on each scan line).
| WINDING
| Selects winding mode (fills any region with a nonzero winding value).
|
Return Values
The return value specifies the previous filling mode. If an error occurs, the
return value is zero.
Remarks
In general, the modes differ only in cases where a complex, overlapping
polygon must be filled (for example, a five-sided polygon that forms a five-pointed
star with a pentagon in the center). In such cases, ALTERNATE mode fills every
other enclosed region within the polygon (that is, the points of the star), but
WINDING mode fills all regions (that is, the points and the pentagon).
When the fill mode is ALTERNATE, GDI fills the area between odd-numbered and
even-numbered polygon sides on each scan line. That is, GDI fills the area
between the first and second side, between the third and fourth side, and so on.
When the fill mode is WINDING, GDI fills any region that has a nonzero winding
value. This value is defined as the number of times a pen used to draw the
polygon would go around the region. The direction of each edge of the polygon is
important.
See Also
GetPolyFillMode
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