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LineDDA info  Overview  Group

The LineDDA function determines which pixels should be highlighted for a line defined by the specified starting and ending points.


    int nXStart,

// x-coordinate of line’s starting point

    int nYStart,

// y-coordinate of line’s starting point

    int nXEnd,

// x-coordinate of line’s ending point

    int nYEnd,

// y-coordinate of line’s ending point

    LINEDDAPROC lpLineFunc,

// address of application-defined callback function

    LPARAM lpData 

// address of application-defined data



Specifies the x-coordinate of the line’s starting point.
Specifies the y-coordinate of the line’s starting point.
Specifies the x-coordinate of the line’s ending point.
Specifies the y-coordinate of the line’s ending point.
Specifies the address of an application-defined callback function. For more information, see the LineDDAProc callback function.
Points to the application-defined data.

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.


The LineDDA function passes the coordinates for each point along the line, except for the line’s ending point, to the application-defined callback function. In addition to passing the coordinates of a point, this function passes any existing application-defined data.

The coordinates passed to the callback function match pixels on a video display only if the default transformations and mapping modes are used.

See Also


See also:

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