Algodoo

Yay! The best method of hacking Thyme since the New Method!

Also, could you explain scene.my.PointIsInEllipse? My GUI is spazzing out again (you know what I mean), so I can't really use the box to read off of, so I tried to use the Appearance menu, but I realized that I simply didn't understand the function at all.

scene.my.ispointinellipse = (a, b, x, y, point, T, F) =>
{{(((point(0) - x) ^2) /a^2) + (((point(1) - y)^2)/b^2) <= 1} ? {T} : {F}}

What are a, b, x, and y?

Are a and b the max and min radius, x and y are the coordinates of the center?

You know, I haven't even memorized what the values of that function do, and I wrote it! *checks legal pad with notes on it*

Okay, so the formula to graph an ellipse is 1=(x-x1)^2/A^2 + (y-y1)^2/B^2
Link to equations
So if you graph it (using a graphing calculator, preferably), A is horizontal width of the ellipse, and B is the vertical width of the ellipse. X1 and Y1 are the xy coords of the center of the ellipse. See for yourself

All the function does is replace the = with <=, to check if a point is in an ellipse, rather than to graph one.

So yes, for the most part, you guessed correctly.

scene.my.PointIsInEllipse = (size, pos, point, T, F)=>{{(((point(0) - pos(0))^2 / size(0)) + ((point(1) - pos(1))^2 / point(1))) <= 1} ? {T} : {F}}

Hmm... Nope. Doesn't work. I don't know.

However, renaming yours does work:
scene.my.PointIsInEllipse = (size, pos, point, T, F) =>
{{(((point(0) - pos(0)) ^2) /size(0)^2) + (((point(1) - pos(1))^2)/size(1)^2) <= 1} ? {T} : {F}}

Ah, now I get it. The denominators are suppost to be squared. How did I miss that...

huh? Wish I knew c.