The week of getting harder

This week I actually didn't put much effort at the beginning cuz I thought that the history of computing machines were easy for me to memorize. I was too sleepy in class so I almost fell asleep during class. So I missed something about the handler. But when I went back home, I downloaded the document for tutorial 3 and I read the Picturing Program 6.1 and 6.2 carefully. So now I understand the concepts of handlers such as "on-tick" and "on-draw".

The  animation is interesting for me. I would like to try different time-intervals, different pictures and the different degrees of rotation by myself. It is kind of fascinating when you actually see an animation displayed in the window. But sometimes I forget the order of different functions and forget where to put a parenthesis.

However, it is a little bit hard for me to define "rotate-second" because I don't understand what it means. I just know the basic codes. I think I need to ask the TA about how to define more definitions by myself. I'm still a little bit confused of how to check-expect the definitions and the purpose of doing so.

I think for the upcoming test, I need to start memorizing the history about computing machines. I didn't read it at all so far. I will put more effort next week on this course.