CanvasItem

Base for all 2D nodes (Node2D and Control)

• can be arranged in trees

  • children inherit parents transform (if parent moves, so do kids)

• are children of Viewport (what they are displayed through)

  • Viewport.canvas_transform: allows applying a custom Transform2D to CanvasItem hierarchy
    • scrolling (and like effects) best achieved by manipulating canvas transform property
  • Problem: We don't want everything to be affected by canvas transform
    • Parallax background
    • UI: superimposed over game world view
    • Transitions (fades, blends)
  • Solution: CanvasLayers

• Movement

  • capture the input in get_input and store in a var representing current velocity
  • in physics process, get input and update velocity

CanvasLayer

node that adds separate 2D rendering layer for all offspring

• allows for a single scene tree to have different canvas transforms

  • each layer has an independent transform

  

• every canvas layer has a transform (translation, rotation, scale, etc.) that can be accessed as a Transform2D.

Viewport

backing for canvas nodes

• have Global Canvas transform (master)
  • affects all individual Canvas Layer transforms
• Stretch transforms: for resizing or stretching screen
  • affects the location of input events

    • ! we can convert InputEvent coordinates to local coordinates with CanvasItem.make_input_local

      

TileMaps

• optimized for large number of tiles
• can have collision, occlusion and navigation shapes on tiles

Particle systems

Used for complex physical effects: sparks, fire, magic, smoke, mist

• Particle: emitted at fixed interval with fixed lifetime
  • every particle has same base behavior, but use randomness to
• Particle Material
  • single texture to be used by particle