Introduction To
                            Greenfoot
                               Part-1


kakihijau.googlepages.com
Disclaimer
 This document is intended to give a beginner an introductory
  material for the Greenfoot system. Greenfoot i...
Introduction
 „Greenfoot is a software tool designed to let beginners
  get experience with object-oriented programming. ...
Outline
   Visual Interface
   Creating Objects
   Interaction with Objects
   Removing Objects
   Objects‘ Action
 ...
Visual Interface (scenario wombats)




                            Introduction to Greenfoot              5
             ...
Visual Interface
 Consists of 3 main parts

 The world
   – The large canvas that covers the majority of the window
   –...
Creating Objects (1)




 (Left-)Click on the Wombat or Leaf class to make it
  active

 To create and place an object i...
Creating Objects (2)




Creating 3 objects and placing             Class
     them into the World               context m...
Interaction with Objects (1)
                          Methods of an object
                           can directly be in...
Interaction with Objects (2)

 The world where the wombats live
  (WombatWorld) is actually an
  object, too
 But there ...
Interaction with Objects (3)




populate()         randomLeaves()
                         Introduction to Greenfoot     ...
Interaction with Objects (4)
 A method may have one or more parameters
 You will be requested to give value(s) of the pa...
Removing Objects (1)
 An object can be removed by selecting item „Remove“
  from the object context menu

 Clicking the ...
Removing Objects (2)




                     Introduction to Greenfoot              14
               Eueung Mulyana | ka...
Objects‘ Action
 Each Actor object has a special method called act()
 Pressing the button „Act“ on the control panel mea...
Simulation „Run“
 A scenario can be run by clicking the „Run“ button
 This equivalent to clicking the „Act“ button over ...
Simulation „Run“




 Running wombats scenario
                           Introduction to Greenfoot              17
      ...
Scenario plane (1)
 Choose „Open ...“ from the „Scenario“
  menu and select the plane scenario
  from the Greenfoot sampl...
Scenario plane (2)




                    Introduction to Greenfoot              19
              Eueung Mulyana | kakihi...
Scenario plane (3)




                    Introduction to Greenfoot              20
              Eueung Mulyana | kakihi...
Scenario turtleGraphics (1)
 Choose „Open ...“ from the „Scenario“ menu and select
  the turtleGraphics scenario from the...
Scenario turtleGraphics (2)




                         Introduction to Greenfoot              22
                   Eueu...
Scenario ants (1)
 Choose „Open ...“ from the „Scenario“ menu and select
  the ants scenario from the Greenfoot sample sc...
Scenario ants (2)




                    Introduction to Greenfoot              24
              Eueung Mulyana | kakihij...
Scenario lunarlander (1)
 Choose „Open ...“ from the „Scenario“ menu and select
  the lunarlander scenario from the Green...
Scenario lunarlander (2)




                       Introduction to Greenfoot              26
                 Eueung Muly...
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Greenfoot Introduction (1)

  1. 1. Introduction To Greenfoot Part-1 kakihijau.googlepages.com
  2. 2. Disclaimer  This document is intended to give a beginner an introductory material for the Greenfoot system. Greenfoot is a software framework made by Poul Henriksen and Michael Koelling at University of Kent / Deakin University. More information can be found at http://www.greenfoot.org  This document is available „AS IS“ free of charge for personal use and non-commercial redistribution. It may not be sold for profit or included in other packages which are sold for profit without written authorisation. This document is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; your use of the document is at your sole risk. Reusing and modifying (part of) this document is allowed, as long as you state explicitly that your work is based on the original document produced by the copyright holder: Eueung Mulyana. The author can be contacted via eueung-[at]-yahoo.com (http://kakihijau.googlepages.com). Introduction to Greenfoot 2 Eueung Mulyana | kakihijau.googlepages.com
  3. 3. Introduction  „Greenfoot is a software tool designed to let beginners get experience with object-oriented programming. It supports development of graphical applications in the Java™ Programming Language“  Designed and implemented at the University of Kent and Deakin University  Copyright held by Poul Henriksen and Michael Koelling  More information at http://www.greenfoot.org  Part of the content of these slides is based on the Greenfoot Tutorial made by Michael Koelling, publicly accesible at the website Introduction to Greenfoot 3 Eueung Mulyana | kakihijau.googlepages.com
  4. 4. Outline  Visual Interface  Creating Objects  Interaction with Objects  Removing Objects  Objects‘ Action  Simulation „Run“  Scenario plane  Scenario turtleGraphics  Scenario ants  Scenario lunarlander Introduction to Greenfoot 4 Eueung Mulyana | kakihijau.googlepages.com
  5. 5. Visual Interface (scenario wombats) Introduction to Greenfoot 5 Eueung Mulyana | kakihijau.googlepages.com
  6. 6. Visual Interface  Consists of 3 main parts  The world – The large canvas that covers the majority of the window – Has a title e.g. WombatWorld – The enviroment („the world“) where objects exist  Class display – Contains all Java classes involved in the scenario – 3 groups: World, Actor and other classes  Execution controls – Controls the action of each object: the „Act“ button – Controls simulation: „Run“, „Pause“, slider – Resets the scenario Introduction to Greenfoot 6 Eueung Mulyana | kakihijau.googlepages.com
  7. 7. Creating Objects (1)  (Left-)Click on the Wombat or Leaf class to make it active  To create and place an object into the world : – Activate a class then shift+click somewhere in the World – Right-click a class (e.g. Wombat class) to open the class context menu, select the „New Wombat()“ item then click somewhere in the World Introduction to Greenfoot 7 Eueung Mulyana | kakihijau.googlepages.com
  8. 8. Creating Objects (2) Creating 3 objects and placing Class them into the World context menu Introduction to Greenfoot 8 Eueung Mulyana | kakihijau.googlepages.com
  9. 9. Interaction with Objects (1)  Methods of an object can directly be invoked  „A method is a single action that an object can perform“  Right-click on one object to show its (object) context menu, where you can select a method to ask the object to do „something“ turnleft() move() Introduction to Greenfoot 9 Eueung Mulyana | kakihijau.googlepages.com
  10. 10. Interaction with Objects (2)  The world where the wombats live (WombatWorld) is actually an object, too  But there may exist only one World object at a time  It functions as a container for Actor objects (e.g. Wombat, Leaf etc.)  Single method invocation is still possible for the World object; just right-click the title „WombatWorld“ and select a method from the menu Introduction to Greenfoot 10 Eueung Mulyana | kakihijau.googlepages.com
  11. 11. Interaction with Objects (3) populate() randomLeaves() Introduction to Greenfoot 11 Eueung Mulyana | kakihijau.googlepages.com
  12. 12. Interaction with Objects (4)  A method may have one or more parameters  You will be requested to give value(s) of the parameter(s) when you invoke such a method  Try the method setDirection() from a Wombat object or the method randomLeaves() from the WombatWorld  A method may also return one value (or reference to an object) if it is invoked  Try foundLeaf() or getLeavesEaten() from a Wombat object Introduction to Greenfoot 12 Eueung Mulyana | kakihijau.googlepages.com
  13. 13. Removing Objects (1)  An object can be removed by selecting item „Remove“ from the object context menu  Clicking the „Reset“ button or creating a new World object from the class context menu may remove all objects; however it actually depends on the constructor implementation of the World class  (*) Introduction to Greenfoot 13 Eueung Mulyana | kakihijau.googlepages.com
  14. 14. Removing Objects (2) Introduction to Greenfoot 14 Eueung Mulyana | kakihijau.googlepages.com
  15. 15. Objects‘ Action  Each Actor object has a special method called act()  Pressing the button „Act“ on the control panel means asking Greenfoot to execute act() method for all objects in the world  An object acts by doing „whatever it wants to do“ e.g.: – Wombats move forward, if they find a leaf in their path, they will eat it – Leaves do nothing  The action depends actually on how act() method is defined; that is, we can program object behaviors!! Introduction to Greenfoot 15 Eueung Mulyana | kakihijau.googlepages.com
  16. 16. Simulation „Run“  A scenario can be run by clicking the „Run“ button  This equivalent to clicking the „Act“ button over and over again very quickly  The slider next to the „Act“ and „Run“ buttons sets the „running/simulation“ speed  Make an experiment with scenario wombats – Click „Reset“ if you have already some objects – Select Populate() from the WombatWorld menu – Click „Run“ Introduction to Greenfoot 16 Eueung Mulyana | kakihijau.googlepages.com
  17. 17. Simulation „Run“ Running wombats scenario Introduction to Greenfoot 17 Eueung Mulyana | kakihijau.googlepages.com
  18. 18. Scenario plane (1)  Choose „Open ...“ from the „Scenario“ menu and select the plane scenario from the Greenfoot sample scenarios  Press the „Compile all“ button, if necessary  Instantiate a Plane object and place somewhere in the world  Run the scenario by pressing „Run“  Try to drag the ControlKnob object and observe the result Introduction to Greenfoot 18 Eueung Mulyana | kakihijau.googlepages.com
  19. 19. Scenario plane (2) Introduction to Greenfoot 19 Eueung Mulyana | kakihijau.googlepages.com
  20. 20. Scenario plane (3) Introduction to Greenfoot 20 Eueung Mulyana | kakihijau.googlepages.com
  21. 21. Scenario turtleGraphics (1)  Choose „Open ...“ from the „Scenario“ menu and select the turtleGraphics scenario from the Greenfoot sample scenarios  Press the „Compile all“ button, if necessary  Instantiate several turtle objects (CircleTurtle, SquareTurtle, FlowerTurtle and SpiralTurtle) and place somewhere in the world  Run the scenario by pressing „Run“  Observe the result Introduction to Greenfoot 21 Eueung Mulyana | kakihijau.googlepages.com
  22. 22. Scenario turtleGraphics (2) Introduction to Greenfoot 22 Eueung Mulyana | kakihijau.googlepages.com
  23. 23. Scenario ants (1)  Choose „Open ...“ from the „Scenario“ menu and select the ants scenario from the Greenfoot sample scenarios  Press the „Compile all“ button, if necessary  By default (standard Greenfoot 1.3 distribution) you will have several objects, which are actually formed together as the World object is created; these objects are instances of the class AntHill and Food; other objects will be created „on-the-fly“  Run the scenario by pressing „Run“  Observe the result Introduction to Greenfoot 23 Eueung Mulyana | kakihijau.googlepages.com
  24. 24. Scenario ants (2) Introduction to Greenfoot 24 Eueung Mulyana | kakihijau.googlepages.com
  25. 25. Scenario lunarlander (1)  Choose „Open ...“ from the „Scenario“ menu and select the lunarlander scenario from the Greenfoot sample scenarios  Press the „Compile all“ button, if necessary  By default you will have a Lander object, which is actually formed together as the World object is created  Now you are ready to play the game; run the scenario by pressing „Run“  The rocket thrust can be controlled by pressing the „down“ key on the keyboard Introduction to Greenfoot 25 Eueung Mulyana | kakihijau.googlepages.com
  26. 26. Scenario lunarlander (2) Introduction to Greenfoot 26 Eueung Mulyana | kakihijau.googlepages.com
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