Feedback for Project2

  Last Friday, we finished project 2. Fortunately, my classmate was so friendly that he helped me with

some difficult problems.

  For instance, I was so confused about a question like: write 2 check-expect expressions for mouse-

event corresponding to button-up and button-down events. He told me "e" is the button and when "e"

is button-down, making x multiply by 20 (denmo=20) and then divide 130 (image width p1=30). If

"e" is button-up, the result is "n". I am so appreciate that he helped me. Thanks a lot!