internal static Device CalculateClosestMatch(List <Device> devices, Point3D[] vectors)
{
Device currDev = null;
Double currDist = -1;
if (vectors == null)
{
return(null);
}
// pointing ray goes from vectors[0] to vectors[1]
Ray3D pointer = new Ray3D(vectors[0], vectors[1]);
Double tempDist;
foreach (Device dev in devices)
{
foreach (Ball ball in dev.Form)
{
// check if Ball is in front of pointing ray
if (Vector3D.AngleBetween(pointer.direction, ball.Center - pointer.origin) < 90)
{
// check distance
tempDist = Point3D.Subtract(pointer.nearestPoint(ball.Center), ball.Center).Length;
if (currDist == -1 || tempDist < currDist)
{
currDev = dev;
currDist = tempDist;
}
}
}
}
return(currDev);
}
/// <summary>
/// The Methode does the collision detection
/// First the pointing vector of the underarm is calculated.
/// This vector will be "extended" to a straight line. Following it will be calculated if this line hits a sphere of a device.
/// Hit devices will be saved in a list.
/// </summary>
/// <param name="devices">Devices which are available in the system</param>
/// <param name="vectors">The position vectors of the ellbows and wrists</param>
/// <returns>Devicelist with hit devices</returns>
internal static List <Device> Calculate(List <Device> devices, Point3D[] vectors)
{
List <Device> found = new List <Device>();
if (vectors == null)
{
return(found);
}
// pointing ray goes from vectors[0] to vectors[1]
Ray3D pointer = new Ray3D(vectors[0], vectors[1]);
foreach (Device dev in devices)
{
foreach (Ball ball in dev.Form)
{
// check if Ball is in front of pointing ray
if (Vector3D.AngleBetween(pointer.direction, ball.Center - pointer.origin) < 90)
{
// check distance
if (Point3D.Subtract(pointer.nearestPoint(ball.Center), ball.Center).Length <= ball.Radius)
{
found.Add(dev);
continue; // skip other balls of this dev
}
}
}
}
return(found);
}
