Visual Coding

Objects and Instances

• An object is a self-contained unit that contains both data (properties) and functionality (methods)

  • Objects represent "things" that your program manipulates

• An instance is a specific realization of an object

  • Each instance has its own unique state (property values)

• Layoutobject can multiple instances

• There visible and invisible objects

• Practice:

  • Visible objects. Create new instances of sprite object

  • Invisible object. Add keyboard controls

Events

• An event is a signal that something has happened, such as a button click, page load, or data arrival

• Common User Interface Events: click, mousedown, mouseup, mousemove, keydown, keyup

• FYI, custom events can be created but thats beyond scope of this class

• Two parts. Condition and the action.

• Practice

  • Add default behaviors for 8D movement

  • Assign keyboard events

    • on Key is down-> Simulate control -> direction

    • add OR block

Event: On Start of layout

• On start of layout an event that fires automatically once when a layout is first loaded

• Each layout has its own independent "On start of layout" event

• Practice

  • Condition: `System-> On start of layout

  • Action: Create object-> select layer -> set position

  • Randomize position