public void IntersectWithRectangleWhenTangent(string ls, string rs, string eps)
{
Line l = Line.Parse(ls);
Rect rect = Rect.Parse(rs);
Point?expected = eps == "null" ? (Point?)null : Point.Parse(eps);
Point?actual = l.ClosestIntersection(rect);
PointAssert.Equal(expected, actual, 2);
}
public void PointOnCircumference(string es, string vs, string eps)
{
var ellipse = Ellipse.Parse(es);
var direction = Vector.Parse(vs);
var expected = Point.Parse(eps);
var actual = ellipse.PointOnCircumference(direction);
PointAssert.Equal(expected, actual, 2);
}
public void FirstIntersectionWithEllipse(string rs, string es, string eps)
{
var ray = Ray.Parse(rs);
var ellipse = Ellipse.Parse(es);
var expected = eps == "null" ? (Point?)null : Point.Parse(eps);
var actual = ray.FirstIntersectionWith(ellipse);
PointAssert.Equal(expected, actual, 2);
}
public void PointAtAngle(string es, double angle, string eps)
{
var ellipse = Ellipse.Parse(es);
var expected = Point.Parse(eps);
var direction = new Vector(1, 0).Rotate(angle);
var actual = ellipse.PointOnCircumference(direction);
PointAssert.Equal(expected, actual, 2);
Assert.Equal(ellipse.CenterPoint.DistanceTo(actual), ellipse.RadiusInDirection(direction), 3);
}
public void FirstIntersectionWithRectFromOutsideRoundtrips(string rs)
{
var rect = Rect.Parse(rs);
var xAxis = new Vector(1, 0);
for (var i = -180; i < 180; i++)
{
var direction = xAxis.Rotate(i);
var fromCenter = new Ray(rect.CenterPoint(), direction);
var pointOnRect = fromCenter.FirstIntersectionWith(rect).GetValueOrDefault();
var ray = new Ray(pointOnRect + direction, direction.Negated());
var actual = ray.FirstIntersectionWith(rect);
PointAssert.Equal(pointOnRect, actual, 2);
if (rect.ClosestCornerPoint(pointOnRect)
.DistanceTo(pointOnRect) < 0.01)
{
continue;
}
Vector wallNormal;
if (Math.Abs(pointOnRect.X - rect.Left) < Constants.Tolerance)
{
wallNormal = new Vector(-1, 0);
}
else if (Math.Abs(pointOnRect.X - rect.Right) < Constants.Tolerance)
{
wallNormal = new Vector(1, 0);
}
else if (Math.Abs(pointOnRect.Y - rect.Bottom) < Constants.Tolerance)
{
wallNormal = new Vector(0, 1);
}
else
{
wallNormal = new Vector(0, -1);
}
for (var j = -89; j < 89; j++)
{
var rayDirection = wallNormal.Rotate(j);
ray = new Ray(pointOnRect + rayDirection, rayDirection.Negated());
actual = ray.FirstIntersectionWith(rect);
if (!NullablePointComparer.TwoDigits.Equals(pointOnRect, actual))
{
Debugger.Break();
}
PointAssert.Equal(pointOnRect, actual, 2);
}
}
}
public void FirstIntersectionWithEllipseFromInsideRoundtrips(string es)
{
var ellipse = Ellipse.Parse(es);
var xv = new Vector(1, 0);
for (var i = -180; i < 180; i++)
{
var direction = xv.Rotate(i);
var expected = ellipse.PointOnCircumference(direction);
var ray = new Ray(ellipse.CenterPoint, direction);
var actual = ray.FirstIntersectionWith(ellipse);
PointAssert.Equal(expected, actual, 2);
}
}
public void FirstIntersectionWithEllipseFromOutsideRoundtrips(string es)
{
var ellipse = Ellipse.Parse(es);
var xv = new Vector(1, 0);
for (var i = -180; i < 180; i++)
{
var fromCenterDirection = xv.Rotate(i);
var pointOnCircumference = ellipse.PointOnCircumference(fromCenterDirection);
var ray = new Ray(pointOnCircumference + fromCenterDirection, fromCenterDirection.Negated());
var actual = ray.FirstIntersectionWith(ellipse);
PointAssert.Equal(pointOnCircumference, actual, 2);
for (var j = -70; j < 70; j++)
{
var direction = fromCenterDirection.Rotate(j);
ray = new Ray(pointOnCircumference + direction, direction.Negated());
actual = ray.FirstIntersectionWith(ellipse);
PointAssert.Equal(pointOnCircumference, actual, 2);
}
}
}
public void IntersectWithRectangleStartingInside(string ls, string rs, string eps)
{
Line l = Line.Parse(ls);
Rect rect = Rect.Parse(rs);
Point expected = Point.Parse(eps);
Point?actual = l.ClosestIntersection(rect);
PointAssert.Equal(expected, actual, 2);
actual = l.Flip().ClosestIntersection(rect);
PointAssert.Equal(expected, actual, 2);
Line l2 = l.RotateAroundStartPoint(0.01);
actual = l2.ClosestIntersection(rect);
PointAssert.Equal(expected, actual, 2);
Line l3 = l.RotateAroundStartPoint(-0.01);
actual = l3.ClosestIntersection(rect);
PointAssert.Equal(expected, actual, 2);
}
