Some Mysteries of objectdraw, Explained

Some Mysteries of objectdraw, Explained

Today, we are going to resolve some mysteries about Grace and the code that you have been writing this semester. Here are some questions that should bother you:

• When writing methods in an object that inherits graphicApplication, why can you refer to "canvas" without declaring it, but you have to pass the canvas explicitly as a parameter to other classes?
• Usually when we call methods that we have not defined in our class, we say someObject.someMethod(). There are some exceptions to this rule, like startGraphics, append, prepend. Why don't we need to include an object?

Some Mysteries of objectdraw, Explained