c# - Do I understand this Strategy Pattern correctly? -

c# - Do I understand this Strategy Pattern correctly? -

in previous question, i've been taught below code illustration of strategy pattern. line _player.draw(spritebatch, _context); in particular.

i don't see difference between line , 1 below it, aside former beingness method call.

could explain me why wouldn't utilize sec phone call right _drawhugecontext , (gasp) delete draw() player class? illustration simple , there situation former much better?

public class arena { player _player; iplayercontext _drawhugecontext; public void draw(spritebatch spritebatch) { _player.draw(spritebatch, _drawhugecontext); _drawhugecontext.draw(spritebatch, _player); } } public class player { public int percentage { get; private set; } [...] //a few more fields public void draw(spritebatch spritebatch, iplayercontext context) { context.draw(spritebatch, this); } } public class iplayercontext { public void draw(spritebatch spritebatch, player player) { spritebatch.draw(player.percentage); [...] //a few more fields drawn player } }

you using strategy patterns, not yet understand why , how utilize them. allow me give simple example.

let's have set of objects , want sort them. problem is: how specify sort order? in .net typically done passing lambda or class knows how compare 2 of objects "sort" method, e.g.

var sorted = myobjects.sort((a,b) => a.id > b.id);

this allows decouple logic of how generically sort list logic of how order 2 elements of specific set.

in case spritebatch strategy injected in calls, object construction not need know, exactly, how draw stuff.

i think can utilize illustration above restructure code effectively.

c# xna-4.0 strategy-pattern