public void Equals_GivenPointsWithDifferentCoords_ShouldReturnFalse()
{
// Arrange.
var p1 = new Point2d(10, 20);
var p2 = new Point2d(1, 2);
// Act & Assert.
Assert.False(p1.Equals(p2));
Assert.False(p1 == p2);
Assert.True(p1 != p2);
Assert.AreNotEqual(p1, p2);
}
private static IEnumerable <Point2d> PerpendicularDistanceSafe(this IEnumerable <Point2d> points, double tol2)
{
IEnumerator <Point2d> enumer = points.GetEnumerator();
if (!enumer.MoveNext())
{
yield break;
}
Point2d p0 = enumer.Current;
// the first point is always part of the simplification
yield return(p0);
if (!enumer.MoveNext())
{
yield break;
}
Point2d p1 = enumer.Current;
Point2d last = p1;
while (enumer.MoveNext())
{
Point2d p2 = enumer.Current;
// test p1 against line segment S(p0, p2)
if (segment_distance2(p0, p2, p1) < tol2)
{
yield return(p2);
last = p2;
// move up by two points
p0 = p2;
// protect against advancing p2 beyond last
if (!enumer.MoveNext())
{
break;
}
p1 = enumer.Current;
}
else
{
yield return(p1);
last = p1;
// move up by one point
p0 = p1;
p1 = p2;
}
}
// make sure the last point is part of the simplification
if (!p1.Equals(last))
{
yield return(p1);
}
}
public static void PerpendicularDistance(this IEnumerable <Point2d> points, double tol, Action <Point2d> result, out int removed)
{
removed = 0;
double tol2 = tol * tol; // squared distance tolerance
// validate input and check if simplification required
if (tol2.EpsilonEquals(0))
{
foreach (Point2d p in points)
{
result(p);
}
return;
}
IEnumerator <Point2d> enumer = points.GetEnumerator();
if (!enumer.MoveNext())
{
return;
}
Point2d p0 = enumer.Current;
// the first point is always part of the simplification
result(p0);
if (!enumer.MoveNext())
{
return;
}
Point2d p1 = enumer.Current;
Point2d last = p1;
while (enumer.MoveNext())
{
Point2d p2 = enumer.Current;
// test p1 against line segment S(p0, p2)
if (segment_distance2(p0, p2, p1) < tol2)
{
result(p2);
last = p2;
// move up by two points
p0 = p2;
// protect against advancing p2 beyond last
if (!enumer.MoveNext())
{
break;
}
p1 = enumer.Current;
removed++;
}
else
{
result(p1);
last = p1;
// move up by one point
p0 = p1;
p1 = p2;
}
}
// make sure the last point is part of the simplification
if (!p1.Equals(last))
{
result(p1);
}
}