line-x-at-y-x-y

Arguments: x1 y1 x2 y2 y

Returns the x coordinate where a line has a particular y coordinate, or nil for a horizontal line.

The first four arguments are real numbers that specify any two distinct points on the line. The last argument is a real number for the y coordinate. The returned value is a real number or nil.

See also line-x-at-y and line-y-at-x-x-y.

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Created 2015.5.21.