Using the sqrt(r^2-x^2) formula I get the same results as with the [sin], [cos]. Maybe I'm just implementing it wrong, but I can't figure out why it's not plotting the correct y values...
Here's the patch I sent before with my implementation of the sqrt(r^2 - x^2) On Sun, Apr 10, 2011 at 8:52 AM, Mathieu Bouchard <ma...@artengine.ca>wrote: > On Sun, 10 Apr 2011, Tyler Leavitt wrote: > > I've not had any real success using the formulas with [sin] and [cos]... >> > > I don't know why, but I had assumed that you wanted to plot something > "parametrically", such as a path drawn from x(t) and y(t) functions, instead > of a y(x) function. I was reading too fast. > > For a y(x) function, sqrt(r*r-x*x) is the formula to use. > > That is related to the fact that sqrt(1-x*x) = sin(acos(x)) = cos(asin(x)) > where asin is anti-sin and acos is anti-cos. > > It's also related to Pythagoras' theorem x*x + y*y = r*r which is also > sin(t)*sin(t) + cos(t)*cos(t) = 1. > > > _______________________________________________________________________ > | Mathieu Bouchard ---- tél: +1.514.383.3801 ---- Villeray, Montréal, QC >
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