line-y-at-x-x-y

Arguments: x1 y1 x2 y2 x

Returns the y coordinate where a line has a particular x coordinate, or nil for a vertical 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 x coordinate. The returned value is a real number or nil.

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

Copyright (c) 1998-2022, Franz Inc. Lafayette, CA., USA. All rights reserved.
This page was not revised from the 10.0 page.
Created 2019.8.20.