Yashab's Notes

02_Display

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Display Package

The display package is the foundation for 2D drawing and event handling. Key concepts include:

  1. DrawingPanel – The actual canvas for 2D drawing.
  2. Drawable interface – A contract for any object that knows how to draw itself.
  3. DrawingPanel Interaction – Mouse events, coordinate transforms, etc.

DrawingPanel

  • A drawing surface that handles coordinate transforms (world to pixel).
  • Methods:
    • setSquareAspect(boolean sq): forces the panel to remain square.
    • setPreferredMinMax(xmin, xmax, ymin, ymax): specify the coordinate bounds.
    • render(): forces a redraw.

If you need custom painting, you can subclass or implement Drawable and then add it to the panel.

Drawable Interface

  • The core method is draw(DrawingPanel panel, Graphics g).
  • Any shape or object that wants to appear on the panel implements this interface.

See Drawables for more detail on common built-in drawable shapes (e.g. DrawableShape, Trail, Plot2D objects, etc.).

Inspectors and Message

  • The package also supports pop-up inspectors for debugging or showing object properties.
  • MessageFrame or MessageBox classes can display text quickly.

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