topical media & game development
[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

talk show tell print

math -- animation 06
math(s) / tutorial(s)

out-of-bound(s)



  if ( sprite.x - sprite.width/2 > right ||
       sprite.x + sprite.width/2 < left ||
       sprite.y - sprite.height/2 > bottom ||
       sprite.y + sprite.height/2 < top )   
       {
       ...
       }

out-of-bound wrap(s)



  if (sprite.x - sprite.width/2 > right) {
     sprite.x = left - sprite.width/2;
  } else if (sprite.x + sprite.width/2 < left} {
     sprite.x = right + sprite.width/2;
  } if (sprite.y - sprite.height/2 > bottom) {
     sprite.y = top - sprite.height/2;
  } else if (sprite.y + sprite.height/2 < top)
     sprite.y = bottom + sprite.height/2;
  }

correct friction(s)



  speed = Math.sqrt(vx*vx + vy*vy);
  angle = Math.atan2(vy,vx);
  if (speed > friction) { speed -= friction; }
  else { speed = 0; }

easy friction(s)



  vx *= friction;
  vy *= friction;
[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

(C) Æliens 04/09/2009

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