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 3
math(s) / tutorial(s)

basic trigonometric functions



  sine of angle = opposite / hypotenuse
  cosine of angle = adjacent / hypotenuse
  tangent of angle = opposite / adjacent

convert radians to degrees



  radians = degrees * Math.PI / 180
  degrees = radians * 180 / Math.PI

rotate to mouse



  dx = mouseX - sprite.x
  dy = mouseY - sprite.y
  sprite.rotation = Math.atan2(dy,dx) * 180 / Math.PI

create wave(s)



  public function frame(event:Event) {
  value = center + Math.sin(angle) * range;
  angle += speed;
  }

create circle(s)



  public function frame(event:Event) {
  x = centerX + Math.cos(angle) * radius;
  y = centerY + Math.sin(angle) * radius;
  angle += speed;
  }

create oval(s)



  public function frame(event:Event) {
  x = centerX + Math.cos(angle) * radiusX;
  y = centerY + Math.sin(angle) * radiusY;
  angle += speed;
  }

distance between point(s)



  dx = x2 - x1;
  dy = y2 - y1;
  distance = Math.sqrt(dx*dx + dy*dy);
[] 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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