Date: Fri, 22 Feb 2008 18:33:12 -0600 (CST)
   From: Mark Jacobson <jacobson@math-cs.cns.uni.edu>
     To: 810-088-09-spring@uni.edu
Subject: Quiz THREE on Wednesday February 27th...  Cars, Wheels, 

Hi 088 students,

      Quiz 3 will be next Wednesday.

      I will review for the quiz three some on Monday and probably have a 
handout too.

      Quiz three will focus mainly on the Cars and the WheelImage and the
RotatingWheelSymbol.                     ----         ----------
-------------------

      theCarSymbol is a Library reusable asset.

      theCarSymbol contains two instances of RotatingWheelSymbol.

             theCarSymbol consists of or is composed of at least 3 things:

                1. an instance of RotatingWheelSymbol that you have

                            given the name rearWheel or rearTire

                                           for its instance name.

                2. an instance of RotatingWheelSymbol that you have

                            given the name frontWheel or frontTire

                                           for the instance name of

                                           this 2nd instantiation of
                                           the RotatingWheelSymbol
                                           Library blueprint for
                                           possibly 100s of animated
                                           wheels.

                3. some graphics drawing with pencil or brush or using
                      ovals and rectangles to make some vehicle frame
                      besides just the two wheels.

        theCarSymbol consists of or is composed of at least 3 things:

             theCarSymbol contains two instances of RotatingWheelSymbol.

                   1. rearWheel is the name of one of them, and

                   2. frontWheel might be the name of the other one.

                   3. the rest of theCarSymbol is unnamed, bumpers or
                      windows or whatever you draw around and on top of
                      those two instances of RotatingWheelSymbol.

         You put an instance of theCarSymbol on the Stage in a Keyframe,

             and the first thing you do is give it a name.

         theCar might be a great instance name for your instance of
                               theCarSymbol Library reusable asset.


      You do NOT EVER PUT ANY WHEELS on the stage in a layer.

      Guess what.  The car has wheels.  They are part of theCarSymbol.

      Put a car on the stage.  That car has wheels as PART OF IT.

      on (release) {

         this.theCar.frontWheel.play();
         this.theCar.backWheel.play();

         play();
      }

      on (release) {

         this.theCar.frontWheel.stop();
         this.theCar.backWheel.stop();

         stop();
      }

      Why do we have to give a name to theCarSymbol?

          So we can talk to it,
             so we can refer to it,
                so we can control it
                                     with our ActionScript 2.0 code!

           And so we can also get inside theCar and reference its

                      frontWheel and backWheel or maybe we named them

                      frontTire and backTire.

           The instances of RotatingWheelSymbol contained in theCarSymbol

                      have to have names!

           They are NESTED INSIDE of theCarSymbol, as the handouts explain.

    The instance of theCarSymbol:

             1. it HAS an unnamed body and frame of some sort, with perhaps
                bumpers and/or windows and even door handles, and

             2. it HAS a rearWheel, and

             3. it HAS a frontWheel.

    My examples are use the name theCar as the instance name for
       theCarSymbol.

    Everyone in my class is an instance of human being.

    You HAVE two eyes, two arms, two legs.

    You have been given an INSTANCE NAME that I will use when I hand back
                                         quiz two on Monday.

    This review of the car assignment handouts and concepts should be very
         helpful in preparing for quiz two and consolidating your
         understanding of some challenging Flash concepts.

    http://www.cs.uni.edu/~jacobson/flash/

    Mark