Date & Time:
December 5, 2018 1:00 pm – 2:30 pm
12/05/2018 01:00 PM 12/05/2018 02:30 PM America/Chicago Brian Hempel’s MS Presentation

Output-Directed SVG Programming

We propose output-directed programming, a paradigm whereby users
directly manipulate the output they wish to create while the system
automatically builds a text-based program that produces the output.

Specifically, we present output-directed programming techniques for
programs that generate Scalable Vector Graphics (SVG) designs. Like a
traditional graphics editor, the system presents a direct manipulation
interface for drawing and manipulating shapes on a canvas. Unlike a
traditional editor, the drawing is represented as a text-based program
in an ordinary functional programming language. Direct manipulation
actions to draw, relate, group, and repeat shapes are affected by
transforming the program. Although the program remains text-editable
at any time, we show how the output-directed tools enable a variety of
complex, readable programs to be constructed without any text-based
program editing.

We evaluate the techniques by implementing over a dozen parametric
designs. While some of the output-directed programming interactions
are by necessity domain-specific, we describe how others are
implemented in a generalized way, to support their application to
other output-directed programming domains.

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