public void GB_BuildEllipseAxisAligned()
{
var builder = new EllipseBuilder();
const int majorAxis = 8;
const int minorAxis = 4;
var points = builder.BuildEllipse(Vector2.Zero, majorAxis, minorAxis, 0);
foreach (var point in points)
{
// Equation for an ellipse:
// (x/a)^2 + (y/b)^2 = 1
var norm = Vector2.UnitX * point.X / majorAxis + Vector2.UnitY * point.Y / minorAxis;
norm.LengthSquared().Should().BeApproximately(1, 0.00001f,
$"Point {point} does not satisfy the ellipse equation.");
}
}
public void GB_BuildEllipseBoundingBox()
{
var builder = new EllipseBuilder();
const int majorAxis = 8;
const int minorAxis = 4;
Rectangle boundingBox = new Rectangle(-majorAxis, -minorAxis, majorAxis * 2, minorAxis * 2);
var points = builder.BuildEllipse((RectangleF)boundingBox);
foreach (var point in points)
{
// Equation for an ellipse:
// (x/a)^2 + (y/b)^2 = 1
var norm = Vector2.UnitX * point.X / majorAxis + Vector2.UnitY * point.Y / minorAxis;
norm.LengthSquared().Should().BeApproximately(1, 0.00001f,
$"Point {point} does not satisfy the ellipse equation.");
}
}