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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.

See Also

AngleArc, Arc, SetArcDirection


file: /Techref/os/win/api/win32/func/src/f02_17.htm, 5KB, , updated: 2000/4/7 11:19, local time: 2024/12/23 05:24,
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