public cCritter pickClosestAhead(cLine sightline, cCritter pcrittercenter,
float visionangle)
{
float closestdistance = 1000000000.0f, testdistance, angle;
cCritter closest = null;
foreach (cCritter c in this)
{
cCritter ppossible = ElementAt();
angle = sightline._tangent.angleBetween(
ppossible.Position.sub(pcrittercenter.Position));
if (ppossible == pcrittercenter || Math.Abs(angle) > visionangle / 2.0f) //Only go for those ahead.
{
continue; //Skip this critter.
}
testdistance = ppossible.distanceTo(sightline); //Pick closest to sightline
// testdistance = ppossible->distanceTo(pcrittercenter); //OR Pick closest to pcrittercenter
if (testdistance < closestdistance)
{
closestdistance = testdistance;
closest = ppossible;
}
}
return(closest);
}
/* looks along the sightline from pcrittercenter and finds candidate critters
* of the desired pruntimeclass and which are within the visionangle field around
* sighline. Of these candidates, the critter that's actually closest to the
* sightline is chosen.*/
public LinkedList <cCritter> touchList(cLine sightline, cCritter pcritterignore = null)
{
LinkedList <cCritter> touchlist = new LinkedList <cCritter>(
delegate(out cCritter c1, cCritter c2)
{
c1 = c2;
}
);
foreach (cCritter c in this)
{
if (ElementAt().touch(sightline) && ElementAt() != pcritterignore)
{
touchlist.Add(ElementAt());
}
}
return(touchlist);
}
public cCritter pickClosestTouched(cLine sightline, cCritter pcritterignore)
{
LinkedList <cCritter> touchlist = touchList(sightline, pcritterignore);
if (touchlist.Size == 0)
{
return(null);
}
float closestdistance = 1000000000.0f, testdistance;
cCritter closest = touchlist.ElementAt(0);
foreach (cCritter c in touchlist)
{
testdistance = touchlist.ElementAt().distanceTo(sightline);
if (testdistance < closestdistance)
{
closestdistance = testdistance;
closest = touchlist.ElementAt();
}
}
return(closest);
}
public cCritter pickTopTouched(cLine sightline, cCritter pcritterignore)
{ /*Same code as pickClosestTouched but with a different sorting critereon;
* we use lineCoord(sightline) instead of distanceTo(sightline). */
LinkedList <cCritter> touchlist = touchList(sightline, pcritterignore);
if (touchlist.Size == 0)
{
return(null);
}
float closestdistance = 1000000000.0f, testdistance;
cCritter closest = touchlist.ElementAt(0); //Everyone in the list is acceptable, so start with 0 is ok.
foreach (cCritter c in touchlist)
{
testdistance = sightline.lineCoord(touchlist.ElementAt().Position);
if (testdistance < closestdistance)
{
closestdistance = testdistance;
closest = touchlist.ElementAt();
}
}
return(closest);
}