Some Issues in the design of the Mangbetu project

Task: Some Issues in the design of the Mangbetu project
Date: 0715-07281.

1. In the flash version of MG, the vector of the base shape has an initial angle of 90 degrees. So if the user input a starting angle of 45, the vector becomes 135. In today's meeting, Bill said from a math teacher's view, it is better to Not have the initial angle.
So shall we keep or remove this initial angle?

2. In the flash version of MG and CC, when we set the rotation degree as 45, the 1st image itself doesn't rotate but its vector do rotate. For all other images except the 1st one, both the images themselves and their vectors rotate 45. Shall we also make the 1st image rotate to have a consistent behavior?

3. In the 1st picture below, the 1st vector is Not reduced by 50%. It is because the image is duplicated before calling 'Translate by percent'. In the 2nd picture, the 1st vector is reduced by 50%. It's because I modified the implementation and let 'Translate by percent' deliberately changes the previous vector. This way looks nice, but the meaning of duplicated is not clear: the duplicated image will be changed by a later method calling.
Which way shall we take: the way in the 1st picture or the 2nd one?4. The order of the codelets
The 3rd picture is for showing 'Rotate before Translate' and Do Not change duplicated image.
The 4th picture is for showing 'Rotate before Translate' and Do change duplicated image.
So in our programmable version, the order of the codelets matters.