Programming games

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Programming games

• Demonstrate work on rps
• Classwork/Homework (complete your own
  rock-paper-scissors). Keep practicing drawing.
  Start bouncing ball.

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Rock paper scissors

• Screen shot on next slide shows complete time
  line.
• You need to add keyframes.
• Modify material on the Stage. Leave buttons
  alone.
• Name (label) certain keyframes.

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Overview of rps

• Static and dynamic text fields
• Buttons representing rock, paper, and scissors
• Event handling for each button is a call to a
  common function computermove('rock')
• Action code in 1st frame holds
• initialization
• function computermove(player)
• Code contains several if statements. True clauses
  have gotoAndPlay("papercovers") etc.
• Other frames contain animations for 3 possible
  outcomes. Ties have no animations.

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Were you bothered?

• The program encodes
• 0 for rock
• 1 for paper
• 2 for scissors
• Some encoding was necessary (to make it work
  smoothlyyou can argue with this). Anything would
  have worked.
• The player never sees the encoding.

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Common problems

• for if true and for else clauses
• Make sure brackets face correct direction
• Math versus math. Need the capital!
• Not naming movie clip instances OR using wrong
  name. This includes upper versus lower case.
• Not naming button flipper.addEventListener(Mouse
  Event.CLICK,flip)
• The handler for an event generally needs a
  parameter in the definition, whether it is used
  or not

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Not so common problem

• Creating new Flash document as opposed to
  Insert/New Symbol

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Common problems

• Need to Insert/Timeline/Keyframe
• To put in ActionScript or put material on the
  stage
• Watch names, especially labels (aka flags) of
  frames
• Scissorscuts vs scissorscuts vs scissorscut vs
  scissorcut vs Scissorscut ..

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Common problems

• Not putting
• stop()
• in frame that is the last frame in each of the 3
  sequences INCLUDING THE LAST One
• Default in Flash is to loop.

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Preview

• There are 3 types of text fields
• static
• dynamic can be changed by code
• input player (user) can change it
• To change the text in a dynamic (or input) text
  field
• result.text " "

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Classwork/Homework

• Complete rock paper scissors
• Read tutorial and make sure you could do the
  whole application.
• Next formal assignment will be Bouncing ball in
  Flash. Read tutorial and start.
• You can look at more complex examples. These
  involve .as files that define programmer-defined
  classes analogous to the definitions for built-in
  objects.