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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: 16-bit coordinates only
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Arc
The Arc function draws an elliptical arc.
BOOL Arc(
HDC hdc,
| // handle to device context
| int nLeftRect,
| // x-coordinate of bounding rectangle's upper-left corner
| int nTopRect,
| // y-coordinate of bounding rectangle's upper-left corner
| int nRightRect,
| // x-coordinate of bounding rectangle's lower-right corner
| int nBottomRect,
| // y-coordinate of bounding rectangle's lower-right corner
| int nXStartArc,
| // first radial ending point
| int nYStartArc,
| // first radial ending point
| int nXEndArc,
| // second radial ending point
| int nYEndArc
| // second radial ending point
| );
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Parameters
hdc
Identifies the device context where drawing takes place.
nLeftRect
Specifies the logical x-coordinate of the upper-left corner of the bounding
rectangle.
Windows 95: The sum of nLeftRect plus nRightRect must be less than 32768.
nTopRect
Specifies the logical y-coordinate of the upper-left corner of the bounding
rectangle.
Windows 95: The sum of nTopRect plus nBottomRect must be less than 32768.
nRightRect
Specifies the logical x-coordinate of the lower-right corner of the bounding
rectangle.
Windows 95: The sum of nLeftRect plus nRightRect must be less than 32768.
nBottomRect
Specifies the logical y-coordinate of the lower-right corner of the bounding
rectangle.
Windows 95: The sum of nTopRect plus nBottomRect must be less than 32768.
nXStartArc
Specifies the logical x-coordinate of the ending point of the radial line
defining the starting point of the arc.
nYStartArc
Specifies the logical y-coordinate of the ending point of the radial line
defining the starting point of the arc.
nXEndArc
Specifies the logical x-coordinate of the ending point of the radial line
defining the ending point of the arc.
nYEndArc
Specifies the logical y-coordinate of the ending point of the radial line
defining the ending point of the arc.
Return Values
If the arc is drawn, the return value is nonzero.
If the arc is not drawn, the return value is zero.
Remarks
The points (nLeftRect, nTopRect) and (nRightRect, nBottomRect) specify the bounding rectangle. An ellipse formed by the specified bounding
rectangle defines the curve of the arc. The arc extends in the current drawing
direction from the point where it intersects the radial from the center of the
bounding rectangle to the (nXStartArc, nYStartArc) point. The arc ends where it intersects the radial from the center of the
bounding rectangle to the (nXEndArc, nYEndArc) point. If the starting point and ending point are the same, a complete ellipse
is drawn.
The arc is drawn using the current pen; it is not filled.
The current position is neither used nor updated by Arc.
Windows 95: The drawing direction is always counterclockwise.
Windows NT: Use the GetArcDirection and SetArcDirection functions to get and set the current drawing direction for a device context.
The default drawing direction is counterclockwise.
Windows 95: The sum of the coordinates of the bounding rectangle cannot exceed 32,767.
The sum of nLeftRect and nRightRect or nTopRect and nBottomRect parameters cannot exceed 32,767.
See Also
AngleArc, ArcTo, Chord, Ellipse, GetArcDirection, Pie, SetArcDirection
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