/// <summary>
/// Onko piste <c>p</c> tämän olion ympäröivän suorakulmion sisäpuolella.
/// </summary>
public bool IsInsideRect(Vector point)
{
Vector p = this.AbsolutePosition;
if (AbsoluteAngle == Angle.Zero)
{
// A special (faster) case of the general case below
if (point.X >= (p.X - Width / 2) &&
point.X <= (p.X + Width / 2) &&
point.Y >= (p.Y - Height / 2) &&
point.Y <= (p.Y + Height / 2))
{
return(true);
}
}
else
{
Vector unitX = Vector.FromLengthAndAngle(1, this.AbsoluteAngle);
Vector unitY = unitX.LeftNormal;
double pX = p.ScalarProjection(unitX);
double pY = p.ScalarProjection(unitY);
double pointX = point.ScalarProjection(unitX);
double pointY = point.ScalarProjection(unitY);
if (pointX >= (pX - Width / 2) &&
pointX <= (pX + Width / 2) &&
pointY >= (pY - Height / 2) &&
pointY <= (pY + Height / 2))
{
return(true);
}
}
return(IsInsideChildren(point));
}
private void NullifyContactForces(PhysicsBody body, ref Vector vector)
{
foreach (var contact in contacts.FindAll(c => c.body1 == body))
{
if (!contact.Active)
{
continue;
}
var target = contact.body2;
double par = vector.ScalarProjection(contact.normal);
double perp = vector.ScalarProjection(contact.normal.LeftNormal);
vector = perp * contact.normal.LeftNormal + (par < 0 ? par : 0) * contact.normal;
}
foreach (var contact in contacts.FindAll(c => c.body2 == body))
{
if (!contact.Active)
{
continue;
}
var target = contact.body1;
double par = vector.ScalarProjection(contact.normal);
double perp = vector.ScalarProjection(contact.normal.LeftNormal);
vector = perp * contact.normal.LeftNormal + (par < 0 ? par : 0) * contact.normal;
}
}
/// <summary>
/// Onko peliolio kahden pisteen välissä
/// </summary>
/// <param name="pos1">Ensimmäinen piste</param>
/// <param name="pos2">Toinen piste</param>
/// <returns></returns>
public bool IsBetween(Vector pos1, Vector pos2)
{
Vector normal = (pos2 - pos1).Normalize();
double ep = this.AbsolutePosition.ScalarProjection(normal);
double p1p = pos1.ScalarProjection(normal);
double p2p = pos2.ScalarProjection(normal);
if (ep < p1p || ep > p2p)
{
return(false);
}
double pn = pos1.ScalarProjection(normal.RightNormal);
double en = this.AbsolutePosition.ScalarProjection(normal.RightNormal);
return(Math.Abs(en - pn) <= 0.5 * Math.Sqrt(this.Width * this.Width + this.Height * this.Height));
}
/// <summary>
/// Onko piste <c>p</c> tämän olion sisäpuolella.
/// </summary>
public bool IsInside(Vector point)
{
Vector p = this.AbsolutePosition;
double pX, pY;
double pointX, pointY;
if (AbsoluteAngle == Angle.Zero)
{
// A special (faster) case of the general case below
pX = p.X;
pY = p.Y;
pointX = point.X;
pointY = point.Y;
}
else
{
Vector unitX = Vector.FromLengthAndAngle(1, this.AbsoluteAngle);
Vector unitY = unitX.LeftNormal;
pX = p.ScalarProjection(unitX);
pY = p.ScalarProjection(unitY);
pointX = point.ScalarProjection(unitX);
pointY = point.ScalarProjection(unitY);
}
if (Shape.IsUnitSize)
{
double x = 2 * (pointX - pX) / this.Width;
double y = 2 * (pointY - pY) / this.Height;
if (this.Shape.IsInside(x, y))
{
return(true);
}
}
else
{
double x = pointX - pX;
double y = pointY - pY;
if (this.Shape.IsInside(x, y))
{
return(true);
}
}
return(IsInsideChildren(point));
}