Hi All, I have some 8th graders visiting my school. I have one hour in which I intend to let them play with the turtles in Racket.
But - there seems to be a bug in the implementation. A bug that puzzles me. It seems the commands are interpreted different when entered in the definition window versus the interaction window. In short: The turtle commands only move the orange triangle if the commands are in the program - not if the same commands are entered in the repl. Consider this program: #lang racket (require graphics/turtles) (turtles #t) (draw 100) (turn 90) It correctly moved the turtle forward 100 pixels drawing a line in the process, and then rotates the turtle 90 degrees. Then an orange triangle is drawn showing the position of the turtle. However if I now enter (forward 100) in the repl, then the line is drawn but the orange triangle stays in place. Any ideas how I can fix this? https://github.com/plt/racket/tree/master/collects/graphics -- Jens Axel Søgaard
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