Final exam version

UML_classes.puml

@@ -0,0 +1,57 @@
+@startuml
+class SpaceObject {
+  x
+  y
+  radius
+  color
+  update()
+  draw()
+}
+
+class Star {
+  name
+  planets
+  add_planet()
+  set_position()
+  update()
+  draw()
+}
+
+class Planet {
+  star
+  orbit_number
+  orbit_radius
+  angle
+  speed
+  direction
+  calculate_position()
+  update()
+  draw_orbit()
+  draw()
+}
+
+class SolarSystem {
+  stars
+  show_orbits
+  paused
+  create_system()
+  resize()
+  update()
+  draw()
+  toggle_pause()
+  toggle_orbits()
+}
+
+class SolarApp {
+  system
+  handle_events()
+  draw_panel()
+  run()
+}
+
+SpaceObject <|-- Star
+SpaceObject <|-- Planet
+Star "1" o-- "many" Planet
+SolarSystem "1" o-- "2" Star
+SolarApp --> SolarSystem
+@enduml