I'm using x + (distance * Math.cos(orientation * Math.PI)) and y + (distance * Math.sin(orientation * Math.PI)) to calculate xx and yy respectively.

50 + (20 * Math.sin(1 * Math.PI)) and 50 + (20 * Math.cos(0.5 * Math.PI)) equal 50

but

50 + (20 * Math.sin(2 * Math.PI)) and 50 + (20 * Math.cos(1.5 * Math.PI)) equal 49.99999999999999?

I expected 50 here too. Is it a javascript quirk I need to use Math.ceil() with (calculating coords on a canvas)?