04_Drawables

Common Built-in Drawables

While you can implement Drawable yourself, OSP includes many ready-made shapes:

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Trail

• Purpose: Keep track of an (x,y) path over time.
• Usage:
  • Trail trail = new Trail();
  • trail.addPoint(x, y); // typically each step
  • frame.addDrawable(trail);
• Appearance:
  • trail.color = Color.red;
  • trail.setStroke(strokeInstance); // to customize line thickness

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DrawableShape

• Prebuilt shapes (rectangles, circles, arcs) that can be placed in world coordinates, auto-drawn.
• DrawableShape.createRectangle(x, y, width, height)
• setAngle(double theta): rotates shape.

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Circle, PixelRectangle, Arrow…

• Circle: a typical usage for representing a small object.
• PixelRectangle: draws a rectangle in pixel coords (handy for UI overlays).
• Arrow: a vector arrow from (x1, y1) to (x2, y2).

See also the “display3d” equivalents for 3D shapes if you are working with DisplayFrame3D.

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