private void TestToStringWithCulture(CultureInfo culture)
{
CultureInfo originalCulture = Thread.CurrentThread.CurrentCulture;
Thread.CurrentThread.CurrentCulture = culture;
try
{
string listSeparator = culture.TextInfo.ListSeparator;
string decimalSeparator = culture.NumberFormat.NumberDecimalSeparator;
var o = new Ray2F(new Vec2F(1.1f, 2.2f), new Vec2F(3.3f, 4.4f));
string s = o.ToString(null, null);
TestToStringResults(o, s, listSeparator, decimalSeparator);
string s2 = o.ToString();
Assert.AreEqual(s, s2);
s = o.ToString("G", culture);
TestToStringResults(o, s, listSeparator, decimalSeparator);
s = o.ToString("R", culture);
TestToStringResults(o, s, listSeparator, decimalSeparator);
}
finally
{
Thread.CurrentThread.CurrentCulture = originalCulture;
}
}
/// <summary>
/// Gets the first intersection of a ray with a box (closest intersection to the
/// ray origin)</summary>
/// <param name="ray">Ray</param>
/// <param name="box">Box</param>
/// <param name="intersection">Intersection point</param>
/// <returns>True iff ray hits box</returns>
public static bool Intersect(Ray2F ray, Box2F box, ref Vec2F intersection)
{
// do X slab
float tmin, tmax;
SlabIntersect(
ray.Direction.X, ray.Origin.X, box.Min.X, box.Max.X, out tmin, out tmax);
// do Y slab
float tminTemp, tmaxTemp;
SlabIntersect(
ray.Direction.Y, ray.Origin.Y, box.Min.Y, box.Max.Y, out tminTemp, out tmaxTemp);
if ((tmin > tmaxTemp) || (tminTemp > tmax))
{
return(false);
}
tmin = Math.Max(tmin, tminTemp);
tmax = Math.Min(tmax, tmaxTemp);
// intersection at tmin, the maximal-minimal value
if (tmin > 0)
{
intersection = ray.Origin + ray.Direction * tmin;
return(true);
}
return(false);
}
/// <summary>
/// Gets the first intersection of a ray with a box (closest intersection to the
/// ray origin)</summary>
/// <param name="ray">Ray</param>
/// <param name="box">Box</param>
/// <param name="intersection">Intersection point</param>
/// <returns>True iff ray hits box</returns>
public static bool Intersect(Ray2F ray, Box2F box, ref Vec2F intersection)
{
// do X slab
float tmin, tmax;
SlabIntersect(
ray.Direction.X, ray.Origin.X, box.Min.X, box.Max.X, out tmin, out tmax);
// do Y slab
float tminTemp, tmaxTemp;
SlabIntersect(
ray.Direction.Y, ray.Origin.Y, box.Min.Y, box.Max.Y, out tminTemp, out tmaxTemp);
if ((tmin > tmaxTemp) || (tminTemp > tmax))
return false;
tmin = Math.Max(tmin, tminTemp);
tmax = Math.Min(tmax, tmaxTemp);
// intersection at tmin, the maximal-minimal value
if (tmin > 0)
{
intersection = ray.Origin + ray.Direction * tmin;
return true;
}
return false;
}
private void TestToStringResults(Ray2F o, string s, string listSeparator, string decimalSeparator)
{
string[] results = s.Split(new[] { listSeparator }, StringSplitOptions.RemoveEmptyEntries);
Assert.AreEqual(results.Length, 4);
foreach (string oneFloatString in results)
Assert.True(oneFloatString.Contains(decimalSeparator));
Assert.AreEqual(float.Parse(results[0]), o.Origin.X);
Assert.AreEqual(float.Parse(results[1]), o.Origin.Y);
Assert.AreEqual(float.Parse(results[2]), o.Direction.X);
Assert.AreEqual(float.Parse(results[3]), o.Direction.Y);
}
/// <summary>
/// Determines if 2 rays intersect, and if so, returns the ray parameters of the intersection point</summary>
/// <param name="r1">Ray 1</param>
/// <param name="r2">Ray 2</param>
/// <param name="t1">Returned ray parameter 1</param>
/// <param name="t2">Returned ray parameter 2</param>
/// <returns>True iff the rays intersect (are not parallel)</returns>
public static bool Intersect(Ray2F r1, Ray2F r2, ref double t1, ref double t2)
{
double denom = (r2.Direction.Y * r1.Direction.X - r2.Direction.X * r1.Direction.Y);
if (Math.Abs(denom) < 0.000001f)
return false;
Vec2F d = Vec2F.Sub(r1.Origin, r2.Origin);
t1 = (r2.Direction.X * d.Y - r2.Direction.Y * d.X) / denom;
t2 = (r1.Direction.X * d.Y - r1.Direction.Y * d.X) / denom;
return true;
}
/// <summary>
/// Determines if 2 rays intersect, and if so, returns the ray parameters of the intersection point</summary>
/// <param name="r1">Ray 1</param>
/// <param name="r2">Ray 2</param>
/// <param name="t1">Returned ray parameter 1</param>
/// <param name="t2">Returned ray parameter 2</param>
/// <returns>True iff the rays intersect (are not parallel)</returns>
public static bool Intersect(Ray2F r1, Ray2F r2, ref double t1, ref double t2)
{
double denom = (r2.Direction.Y * r1.Direction.X - r2.Direction.X * r1.Direction.Y);
if (Math.Abs(denom) < 0.000001f)
{
return(false);
}
Vec2F d = Vec2F.Sub(r1.Origin, r2.Origin);
t1 = (r2.Direction.X * d.Y - r2.Direction.Y * d.X) / denom;
t2 = (r1.Direction.X * d.Y - r1.Direction.Y * d.X) / denom;
return(true);
}
/// <summary>
/// Constructs the circle containing 3 points</summary>
/// <param name="p1">Point 1</param>
/// <param name="p2">Point 2</param>
/// <param name="p3">Point 3</param>
public CircleF(Vec2F p1, Vec2F p2, Vec2F p3)
{
Vec2F o1 = Vec2F.Add(p1, p2); o1 *= 0.5f;
Vec2F o2 = Vec2F.Add(p3, p2); o2 *= 0.5f;
Vec2F d1 = Vec2F.Sub(p2, p1); d1 = d1.Perp;
Vec2F d2 = Vec2F.Sub(p3, p2); d2 = d2.Perp;
double t1 = 0;
double t2 = 0;
if (Ray2F.Intersect(new Ray2F(o1, d1), new Ray2F(o2, d2), ref t1, ref t2))
{
Center = o1 + d1 * (float)t1;
Radius = Vec2F.Distance(Center, p1);
}
else
{
Center = new Vec2F(float.PositiveInfinity, float.PositiveInfinity);
Radius = float.PositiveInfinity;
}
}
