The trick is that racket/gui is not generally available when rendering documentation, because it requires a GUI context. Text and image output is rendered to an image file when the MREVAL environment variable is set, so run the enclosing document once with the environment varibale to generate the images. Future runs (with the environment variable unset) use the generated image.
syntax
( gui-interaction datum...)
syntax
( gui-interaction-eval datum...)
#:eval+optsthe-evalget-predicate?get-renderget-get-widthget-get-heightdatum...)syntax
( gui-interaction-eval-show datum...)
#:eval+optsthe-evalget-predicate?get-renderget-get-widthget-get-heightdatum...)syntax
( gui-racketblock+eval datum...)
#:eval+optsthe-evalget-predicate?get-renderget-get-widthget-get-heightdatum...)syntax
( gui-racketmod+eval datum...)
#:eval+optsthe-evalget-predicate?get-renderget-get-widthget-get-heightdatum...)syntax
( gui-def+int datum...)
syntax
( gui-defs+int datum...)
get-predicate?:(->(->any/cboolean?)) Determines if a value is a graphical object (and thus handled by the other operations)
get-render:(->(->any/c(is-a?/cdc<%>)number?number?void?)) Draws a graphical object (only called if the predicate returned #t; the first argument will be the value for which the predicate holds).
get-get-width:(->(->any/cnumber?)) Gets the width of a graphical object (only called if the predicate returned #t; the first argument will be the value for which the predicate holds).
get-get-height:(->(->any/cnumber?)) Gets the height of a graphical object (only called if the predicate returned #t; the first argument will be the value for which the predicate holds).