Class notes
Unit 6 - Group, step events & motion
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Course was done online during covid using CMU CS Academy with Vincent Massey Secondary School (VMSS)
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Unit 6 - Group, step events and motion:Saturday, January 9, 2021 4:42 PM
Section 6.1 - Groups:
Subsection 6.1.1 - Groups:
Lesson 1 - Motivation:
A group is a collection of shapes that we treat as a single shape. To help
see why groups are useful, let's start with this example that draws a circled
star, and moves it as you move the mouse:
Run the code, move the mouse, and see that the circled star moves with it.
This code works, but it's not very convenient. We have to update the
center of the circle and the star separately, even though we think of the
circle and star as being part of a single shape (a circled star). This is a
great time to use a group. If we place the circle and the star in a group,
then we can treat them as a single shape.
Subsection 6.1.2 - Group properties:
Lesson 1 - Position properties:
First, let's review this example from the previous notes:
We see that when we change the centerX and centerY of the group, this
changes the positions of every shape in the group. This is true of all
the position properties of a group.
Lesson 2 - Non-position properties:
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