Ellipse contains method is incorrect

Issue details

Ellipse contains method is incorrect.

I was attempting to use the Ellipse to check for mouse clicks on Elliptical buttons and realized the contains method is incorrect.

x = x - this.x;
y = y - this.y;

return (x * x) / (width * 0.5f * width * 0.5f) + (y * y) / (height * 0.5f * height * 0.5f) <= 1.0f;

I believe the issue is that the x and y of the ellipse are the bottom left coordinate you would get if you drew a rectangle exactly encompassing the ellipse when the formula here is for an x and y at the center of the ellipse

Reproduction steps/code

Ellipse ellipse = new Ellipse(0, 0, 50, 50);
Assert.assertFalse(ellipse.contains(0, 0)); // Should not be within the ellipse, but the formula currently marks it as such.
Assert.assertTrue(ellipse.contains(25, 25)); // Should be contained as this is the center of the ellipse, but the formula currently marks it as outside.

Version of LibGDX and/or relevant dependencies

ALL (according to git) But I’m currently using 1.9.11

Stacktrace

N/A

Please select the affected platforms

• [x ] Android
• [ x] iOS
• [ x] HTML/GWT
• [ x] Windows
• [ x] Linux
• [ x] MacOS

[MobiDevelop]

Reading the source of the Ellipse class suggests the (x,y) is considered to be the center point of the ellipse.

[obigu]

Looks like Implementation is correct, the issue can be closed. If you believe documentation can be improved, please feel free to open a PR.