I have a rectangle in canvas, and I know how to move it up and sideways. What I want to do is have it move in a circular motion.
So my objects(rectangle) x and y would go in a circle.
Now I am assuming I need a radius for how far out and some formula for the speed(1pixel) to get it rotate on the axis.
Any idea's?
The parametric equation for moving in a circle is this:
x=r*cos(theta)
y=r*sin(theta)
theta
is the angle, and r
the radius.
If you want to know the change in theta
to get the desired speed, solving for the distance d
you get that the change in theta
is: arccos(1-(d/r)^2/2)
The JavaScript functions are Math.cos, Math.sin, and Math.acos, respsectively. They all deal with radians.
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