The ExtCreatePen function creates a logical cosmetic or geometric pen that has the specified style, width, and brush attributes.
HPEN ExtCreatePen( _In_ DWORD dwPenStyle, _In_ DWORD dwWidth, _In_ const LOGBRUSH *lplb, _In_ DWORD dwStyleCount, _In_ const DWORD *lpStyle );
- dwPenStyle [in]
A combination of type, style, end cap, and join attributes. The values from each category are combined by using the bitwise OR operator ( | ).
The pen type can be one of the following values.
The pen is geometric.
The pen is cosmetic.
The pen style can be one of the following values.
The end cap is only specified for geometric pens. The end cap can be one of the following values.
End caps are round.
End caps are square.
End caps are flat.
The join is only specified for geometric pens. The join can be one of the following values.
Joins are beveled.
Joins are mitered when they are within the current limit set by the SetMiterLimit function. If it exceeds this limit, the join is beveled.
Joins are round.
- dwWidth [in]
The width of the pen. If the dwPenStyle parameter is PS_GEOMETRIC, the width is given in logical units. If dwPenStyle is PS_COSMETIC, the width must be set to 1.
- lplb [in]
A pointer to a LOGBRUSH structure. If dwPenStyle is PS_COSMETIC, the lbColor member specifies the color of the pen and the lpStyle member must be set to BS_SOLID. If dwPenStyle is PS_GEOMETRIC, all members must be used to specify the brush attributes of the pen.
- dwStyleCount [in]
The length, in DWORD units, of the lpStyle array. This value must be zero if dwPenStyle is not PS_USERSTYLE.
The style count is limited to 16.
- lpStyle [in]
A pointer to an array. The first value specifies the length of the first dash in a user-defined style, the second value specifies the length of the first space, and so on. This pointer must be NULL if dwPenStyle is not PS_USERSTYLE.
If the lpStyle array is exceeded during line drawing, the pointer is reset to the beginning of the array. When this happens and dwStyleCount is an even number, the pattern of dashes and spaces repeats. However, if dwStyleCount is odd, the pattern reverses when the pointer is reset -- the first element of lpStyle now refers to spaces, the second refers to dashes, and so forth.
If the function succeeds, the return value is a handle that identifies a logical pen.
If the function fails, the return value is zero.
A geometric pen can have any width and can have any of the attributes of a brush, such as dithers and patterns. A cosmetic pen can only be a single pixel wide and must be a solid color, but cosmetic pens are generally faster than geometric pens.
The width of a geometric pen is always specified in world units. The width of a cosmetic pen is always 1.
End caps and joins are only specified for geometric pens.
After an application creates a logical pen, it can select that pen into a device context by calling the SelectObject function. After a pen is selected into a device context, it can be used to draw lines and curves.
If dwPenStyle is PS_COSMETIC and PS_USERSTYLE, the entries in the lpStyle array specify lengths of dashes and spaces in style units. A style unit is defined by the device where the pen is used to draw a line.
If dwPenStyle is PS_GEOMETRIC and PS_USERSTYLE, the entries in the lpStyle array specify lengths of dashes and spaces in logical units.
If dwPenStyle is PS_ALTERNATE, the style unit is ignored and every other pixel is set.
If the lbStyle member of the LOGBRUSH structure pointed to by lplb is BS_PATTERN, the bitmap pointed to by the lbHatch member of that structure cannot be a DIB section. A DIB section is a bitmap created by CreateDIBSection. If that bitmap is a DIB section, the ExtCreatePen function fails.
When an application no longer requires a specified pen, it should call the DeleteObject function to delete the pen.
ICM: No color management is done at pen creation. However, color management is performed when the pen is selected into an ICM-enabled device context.
For an example, see Using Pens.
Minimum supported client
|Windows 2000 Professional [desktop apps only]|
Minimum supported server
|Windows 2000 Server [desktop apps only]|
- Pens Overview
- Pen Functions