Name

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  MGH_LINE_COEFF

Description

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    Given a pair of points in an X-Y plane, return the coefficients
    of the equation ax + by + c = 0 defining a line through the
    points.
    This is a utility function used in describing polygon-clipping
    operations. See MGH_POLYFILLG.

Calling Sequence

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    result = mgh_mgh_line_coeff(x0, y0, x1, y1)

Positional Parameters

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  x0,y0,x1,y1 (input, numeric scalar)
    Coordinates of points (x0,y0) and (x1,y1)

Return Value

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    The function returns a 3-element numeric vector containing the
    coefficients of the line. The sign of the coefficents is such
    that quantity s = (ax + by + c) increases to the right of the
    vector (x0,y0) -> (x1,y1)

Modification History

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    Mark Hadfield, 2002-08:
      Written
    Mark Hadfield, 2015-02:
      - Moved to Motley library, where it should have been all along.
      - Source code updated/