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getting_started.js
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getting_started.js
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//create canvas called `c` before loading script!
//create a function called refresh and copy the following code inside it!
if ( theta >= 2*Math.PI )
{
theta = 0+theta-2*Math.PI
}
if ( Math.tan(theta) >= 0 )
{
if ( theta > Math.PI )
{
i_hat[0] = -Math.sqrt(-1/(-1-Math.pow(Math.tan(theta), 2)))
i_hat[1] = f2(i_hat[0])
}
else {
i_hat[0] = Math.sqrt(-1/(-1-Math.pow(Math.tan(theta), 2)))
i_hat[1] = f1(i_hat[0])
}
}
else
{
if ( theta > Math.PI )
{
i_hat[0] = Math.sqrt(-1/(-1-Math.pow(Math.tan(theta), 2)))
i_hat[1] = f2(i_hat[0])
}
else {
i_hat[0] = -Math.sqrt(-1/(-1-Math.pow(Math.tan(theta), 2)))
i_hat[1] = f1(i_hat[0])
}
}
var nTheta = (theta+Math.PI/2)%(2*Math.PI)
if ( Math.tan(nTheta) >= 0 )
{
if ( nTheta > Math.PI )
{
j_hat[0] = -Math.sqrt(-1/(-1-Math.pow(Math.tan(nTheta), 2)))
j_hat[1] = f2(j_hat[0])
}
else {
j_hat[0] = Math.sqrt(-1/(-1-Math.pow(Math.tan(nTheta), 2)))
j_hat[1] = f1(j_hat[0])
}
}
else
{
if ( nTheta > Math.PI )
{
j_hat[0] = Math.sqrt(-1/(-1-Math.pow(Math.tan(nTheta), 2)))
j_hat[1] = f2(j_hat[0])
}
else {
j_hat[0] = -Math.sqrt(-1/(-1-Math.pow(Math.tan(nTheta), 2)))
j_hat[1] = f1(j_hat[0])
}
}
theta+=rotationSpeed
window.requestAnimationFrame(refresh)