648: Mainline

According to the following definition, the createViews method starts the GUI machinery in motion by creating a top pane and a graph pane, and assigning those instances to local variables, theTopPane and theMeterPane. The value of another local variable, theCalorieViewManager, is the CalorieViewManager instance itself, which is also, of course, the value of self. The local variable is established because its name helps to make the relations among the instances clearer as createViews grows more complex.

CalorieViewManager method definition • instance 
createViews 
  | theCalorieViewManager theTopPane theMeterPane | 
  theCalorieViewManager := self. 
  theTopPane := TopPane new. 
  theMeterPane := MeterGraphPane new. 
  ...