ITEC 120 2008spring ibarland, jdymacek

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lab10b
greenfoot: wombats
...and now for something completely different

• Before anything else, you need to make a copy of some existing project files: Copy the folder
  C: > software > greenfoot > scenarios > wombats2
  to your own H: drive (inside your 120 folder); name it "my-wombats".
• Once this is done, start up a program called greenfoot:
  Start > Programs > Radford University Course Software > College of Science and Technology > Greenfoot > Greenfoot.
  When it asks what you want to do, select “choose a scenario”, and navigate to your H: drive's copy of my-wombats.
  Do not open the scenario on the C: drive; you'll change it for everybody on the system!
• Make some wombat objects and leaves, and drag them to the grid.
• Press “act” repeatedly. You can also try “run”.
• Look inside class Wombat, and look at the act method.
• Change the code so that the wombat turns randomly, before (attempting) to move.
  You'll need to inspect the code for Wombats, and figure out how it's all working!
• Change the code so that a wombat won't enter a square if it already contains a wombat. (The provided scenario already checks for rocks; you can base your code on that.)
• Moving reduces a wombat's energy 1 unit; eating a leaf boosts it 20 units. When a wombat runs out of energy, it dies.¹ (That is, it turns upside-down, and never acts again.)
  Write it!
• Make it so that a leaf might be poisonous. What do you want to happen when a Wombat eats a poisonous leaf? Make the leaf constructor give (say) a 20% chance to having the new leaf be poisonous.
• If a Wombat eats a leaf, have a new one appear somewhere else in the world.
  Here is some example code which creates a new leaf at location 3,2:

  Leaf aNewLeaf; aNewLeaf = new Leaf(); aNewLeaf.addToWorld(3,2,this.getWorld()) // We must first change class Actor, so that // addToWorld is public, for the preceding line to compile.

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©2008, Ian Barland, Radford University Last modified 2008.Jan.24 (Thu)

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