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.

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Created 2016.6.21.