Example with an algebraic formula driven interactive animation

Here you see an interactive animation with an object driven in two directions by two formula's.

<SCRIPT>
function Set()
{
 t = 0.0; 
 dt = 0.01;
 x = 0.0;
 y = 1.0;
 a = 100.0;
 b = 100.0;
 c = -100.0;
 d = 100.0;
 i = 0;
 j = 0;
 document.munt.setX(i);
 document.munt.setY(j);
}

function baan1()
{
  a = 100.0; c = -100.0;
}

function baan2()
{
  a = 50.0; c = -50.0;
}

function run()
{
  t = t + dt; 

  x = Math.sin(2*3.14*t);
  y = Math.cos(2*3.14*t);

  i = Math.round(a*x + b);  
  j = Math.round(c*y + d);

  document.munt.setX(i);
  document.munt.setY(j);
  if (t<10.0) {window.setTimeout("run();",5)};
}
</SCRIPT>

....

<CENTER>
<APPLET CODE="Animatie.class" NAME=munt WIDTH=200 HEIGHT=200></APPLET>

<FORM>
<INPUT TYPE="button" NAME="S" VALUE="Start" onClick="Set(this.form)">
<INPUT TYPE="button" NAME="C1" VALUE="Baan groot" onClick="baan1(this.form)">
<INPUT TYPE="button" NAME="C2" VALUE="Baan klein" onClick="baan2(this.form)">
<INPUT TYPE="button" NAME="R" VALUE="Run" onClick="run(this.form)">
</FORM>
</CENTER>

Enschede, 2 maart 2000; update: Febr. 2004