public void GetIntersectionPointsCircle_NoIntersection_SameX()
{
//assign
WCircle a = new WCircle(new WPoint(-2, 0), 1);
WCircle b = new WCircle(new WPoint(2, 0), 1);
//act
WPoint[] result = a.GetIntersectionPoints(b);
//assert
Assert.IsNull(result);
}
public void GetIntersectionPointsCircle_SingleIntersection_SameX_DiffRadius()
{
//assign
WCircle a = new WCircle(new WPoint(-2, 0), 2);
WCircle b = new WCircle(new WPoint(1, 0), 1);
//act
WPoint[] result = a.GetIntersectionPoints(b);
//assert
Assert.AreEqual(1, result.Length);
Assert.AreEqual(new WPoint(0, 0), result[0]);
}
public void GetIntersectionPointsLine_VerticalLine_A()
{
//assign
Geometry.MarginOfError = 0.01;
WCircle a = new WCircle(new WPoint(53.8075, 29.1875), 4.6825) / Utilities.UNITS_TO_PIXELS;
WLine b = new WLine(new WPoint(51.27, 25), new WPoint(51.27, 19.125)) / Utilities.UNITS_TO_PIXELS;
//account
Utilities.SaveDiagram(new IDraw[] { a, b.ToLineSegment() }, nameof(TestCircle));
//act
WPoint[] result = a.GetIntersectionPoints(b);
//assert
Assert.AreEqual(2, result.Length);
}
public void GetIntersectionPointsCircle_DoubleIntersection_SameX()
{
//assign
WCircle a = new WCircle(new WPoint(-0.5, 0), 1);
WCircle b = new WCircle(new WPoint(0.5, 0), 1);
//act
WPoint[] result = a.GetIntersectionPoints(b);
WPoint minResult = (result[0] < result[1]) ? result[0] : result[1];
WPoint maxResult = (minResult == result[0]) ? result[1] : result[0];
//assert
Assert.AreEqual(2, result.Length);
Assert.AreEqual(new WPoint(0, -0.5 * Math.Sqrt(3)), minResult);
Assert.AreEqual(new WPoint(0, 0.5 * Math.Sqrt(3)), maxResult);
}
public void GetIntersectionPointsLineSegment_DoubleIntersection()
{
//assign
Geometry.MarginOfError = 0.01;
//(x - 2)^2 + (y + 3)^2 = 4
WCircle a = new WCircle(new WPoint(2, -3), 2);
//2x + 2y = -1
WLineSegment c = new WLineSegment(new WPoint(5, -11.0 / 2.0), new WPoint(0, -1.0 / 2.0));
//account
Utilities.SaveDiagram(new IDraw[] { a, c }, nameof(TestCircle));
//act
WPoint[] result = a.GetIntersectionPoints(c);
WPoint minResult = (result[0] < result[1]) ? result[0] : result[1];
WPoint maxResult = (minResult == result[0]) ? result[1] : result[0];
//assert
Assert.AreEqual(2, result.Length);
Assert.IsTrue(new WPoint(0.86, -1.36) == minResult);
Assert.IsTrue(new WPoint(3.64, -4.14) == maxResult);
}