JS circle


    May 30 2010 | 9:10 pm
    Hi,
    I´m new at js and I´m trying to draw a circle, but there is still something wrong.
    Maybe someone could help...
    //the js
    inlets = 1;
    outlets = 1;
    var r = 1;
    function msg_float(x)
    {
    Math.pow(r,2) = Math.pow(y,2)+Math.pow(x,2);
    outlet(0, y);
    }
    //thanks Falk

    • May 30 2010 | 10:20 pm
      not actually sure what you are trying to do (my math skills are bad!!) but it looks like r2 = x2 + y2. you are trying to assign the result of your equation (y2+x2) to a function Math.pow(r,2), which doesn't make sense since Math.pow is returning a value. You can only pass it a value inside the (). also y is never defined and you are trying to send it to your outlet.
      The below should work and give you r2 (y is a constant right now).
      I'm sure someone with more js and math chops will explain it better, but maybe this will get you started.
      var y = 2;
      function msg_float(x)
      {
      var r = Math.pow(y,2)+Math.pow(x,2);
      outlet(0, r);
      }
    • May 31 2010 | 7:24 am
      Hi MIB,
      you got me on the right path, I tried to assign a function to a value, I have to solve the equation for y, then it works, code blow.
      thanks a lot
      Falk
      inlets = 1;
      outlets = 1;
      var r =1;
      function msg_float(x)
      {
      y = Math.sqrt(Math.pow(r,2) - Math.pow(x,2));
      outlet(0, y);
      }
    • May 31 2010 | 7:28 am
      Hi HTH,
      thanks too for your nice example
      Falk