public void WidenedPolygonHasFourCorners()
{
Point p1 = new Point(1.234, -3.456);
Point p2 = new Point(34, 456);
var lw = new LineWidener(p1, p2);
Polygon p = lw.Widen(1.0);
Assert.AreEqual(4, p.Vertices.Count);;
}
public void NormalLengthIsOneForNoYDistance()
{
Point p1 = new Point(1.234, -3.456);
Point p2 = new Point(34, -3.456);
var lw = new LineWidener(p1, p2);
Point normal = lw.FindNormal();
Assert.AreEqual(1.0, Math.Round(normal.Length(), 6));
}
public void WidenedPolygonHasCorrectWidth()
{
Point p1 = new Point(1.234, -3.456);
Point p2 = new Point(34, 456);
var lw = new LineWidener(p1, p2);
Polygon p = lw.Widen(1.0);
Assert.AreEqual(1.0, p.Vertices[0].Distance(p.Vertices[3]), 1e-6);
Assert.AreEqual(1.0, p.Vertices[1].Distance(p.Vertices[2]), 1e-6);
}
public void NormalScalarProductIsZero()
{
Point p1 = new Point(1.234, -3.456);
Point p2 = new Point(34, 456);
var lw = new LineWidener(p1, p2);
Point normal = lw.FindNormal();
double scalarProduct = normal.X * (p1.X - p2.X) + normal.Y * (p1.Y - p2.Y);
Assert.AreEqual(0.0, Math.Round(scalarProduct, 6));
}
