ArcTo info Overview Group

The ArcTo function draws an elliptical arc.

BOOL ArcTo(

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 nXRadial1,	// x-coordinate of the first radial ending point
int nYRadial1,	// y-coordinate of the first radial ending point
int nXRadial2,	// x-coordinate of the second radial ending point
int nYRadial2	// y-coordinate of the second radial ending point
);

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.
nTopRect: Specifies the logical y-coordinate of the upper-left corner of the bounding rectangle.
nRightRect: Specifies the logical x-coordinate of the lower-right corner of the bounding rectangle.
nBottomRect: Specifies the logical y-coordinate of the lower-right corner of the bounding rectangle.
nXRadial1: Specifies the logical x-coordinate of the endpoint of the radial defining the starting point of the arc.
nYRadial1: Specifies the logical y-coordinate of the endpoint of the radial defining the starting point of the arc.
nXRadial2: Specifies the logical x-coordinate of the endpoint of the radial defining the ending point of the arc.
nYRadial2: Specifies the logical y-coordinate of the endpoint of the radial defining the ending point of the arc.

Return Values

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

Remarks

ArcTo is similar to the Arc function, except that the current position is updated.

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 counterclockwise from the point where it intersects the radial line from the center of the bounding rectangle to the (nXRadial1, nYRadial1) point. The arc ends where it intersects the radial line from the center of the bounding rectangle to the (nXRadial2, nYRadial2) point. If the starting point and ending point are the same, a complete ellipse is drawn.

A line is drawn from the current position to the starting point of the arc. If no error occurs, the current position is set to the ending point of the arc.

The arc is drawn using the current pen; it is not filled.

ArcTo info Overview Group

Parameters

Return Values

Remarks

See Also