Key points are not available for this paper at this time.
Juno is a system that harmoniously integrates a language for describing pictures with a what-you-see-is-what-you-get image editor. Two of Juno's novelties are that geometric constraints are used to specify locations, and that the text of a Juno program is modified in response to the interactive editing of the displayed image that the program produces.
Greg Nelson (Mon,) studied this question.