3.4 Key Events
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Vocabulary
| Term | Definition |
|---|---|
| Constant | A variable in a program that has a value that does not change. |
| Magic Number | A number in your code that appears arbitrary. These should all be replaced with calculations or constants. |
| Canvas | The screen in which our graphics programs are drawn. |
| Scope | In what part of the program the variable exits |
| Global variable | A variable that can be used throughout a program, in every scope |
| Event | An event is an action (such as clicking the mouse or pressing a key on the keyboard) that a program detects and uses as input. |
| Coordinate system | A coordinate system uses numbers as coordinates to place objects in a geometric space. |
| Callback Function | A function passed as a parameter to another function in order to be called later. |