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| Allegro CL version 9.0 Unrevised from 8.2 to 9.0. 8.2 version

## line-y-at-x

Arguments: point1 point2 x

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

The first two arguments are position objects 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`.

As usual, position objects should contain integers. See make-position. See also line-x-at-y and line-y-at-x-x-y.

Copyright (c) 1998-2019, Franz Inc. Oakland, CA., USA. All rights reserved.
This page was not revised from the 8.2 page.
Created 2012.5.30.

|  | ToC | DocOverview | CGDoc | RelNotes | FAQ | Index | PermutedIndex
| Allegro CL version 9.0 Unrevised from 8.2 to 9.0. 8.2 version