public static Route CalculateLineOfSight(this IRectangular from, IRectangular to, float increment)
{
Route ret = new Route();
IRectangular current = from;
var currentDistance = current.CalculateDistanceTo(to);
var firstDistance = currentDistance;
while (currentDistance > increment)
{
#if DEBUG
if (currentDistance > firstDistance)
{
throw new Exception("Bug, we got farther away");
}
#endif
current = Rectangular.Create(MoveTowards(current.Center(), to.Center(), increment), from);
current = Rectangular.Create(current.Left - from.Width / 2, current.Top - from.Height / 2, from.Width, from.Height);
ret.Steps.Add(current);
var obstacles = SpaceTime.CurrentSpaceTime.Elements
.Where(el => el != from && el != to && el.NumberOfPixelsThatOverlap(current) > 0);
foreach (var obstacle in obstacles)
{
if (ret.Obstacles.Contains(obstacle) == false)
{
ret.Obstacles.Add(obstacle);
}
}
currentDistance = current.CalculateDistanceTo(to);
}
return(ret);
}
public static Route CalculateLineOfSight(IRectangular from, ILocation to, float increment)
{
Route ret = new Route();
IRectangular current = from;
while (from.Center().CalculateDistanceTo(to) > increment)
{
current = Rectangular.Create(MoveTowards(current.Center(), to, increment), from);
ret.Steps.Add(current.Center());
var obstacles = SpaceTime.CurrentSpaceTime.Elements
.Where(el => el.NumberOfPixelsThatOverlap(current) > 0);
foreach (var obstacle in obstacles)
{
if (ret.Obstacles.Contains(obstacle) == false)
{
ret.Obstacles.Add(obstacle);
}
}
}
return(ret);
}
public override void Evaluate()
{
float dt = (float)Governor.Rate.TotalSeconds;
if (dt == 0)
{
dt = (float)Time.CurrentTime.Increment.TotalSeconds;
}
float dx = SpeedX * dt;
float dy = SpeedY * dt;
if (dx == 0 && dy == 0)
{
return;
}
var hitPrediction = HitDetection.PredictHit(SpaceTime.CurrentSpaceTime, Element, HitDetectionTypes, dx, dy);
if (hitPrediction.Type != HitType.None)
{
float angle;
if (hitPrediction.ElementHit != null)
{
angle = Element.Center().CalculateAngleTo(hitPrediction.ElementHit.Center());
}
else if (hitPrediction.Direction == Direction.Left)
{
angle = 180;
}
else if (hitPrediction.Direction == Direction.Right)
{
angle = 0;
}
else if (hitPrediction.Direction == Direction.Up)
{
angle = 270;
}
else if (hitPrediction.Direction == Direction.Down)
{
angle = 90;
}
else
{
throw new NotSupportedException($"Unsupported direction: {hitPrediction.Direction}");
}
if (ImpactOccurred != null && haveMovedSinceLastHitDetection)
{
ImpactOccurred.Fire(new Impact()
{
Angle = angle,
Bounds = hitPrediction.BoundsOfItemBeingHit,
ElementHit = hitPrediction.ElementHit
});
}
haveMovedSinceLastHitDetection = false;
var testArea = Rectangular.Create(Element.Left + dx, Element.Top + dy, Element.Width, Element.Height);
if (hitPrediction.Direction == Direction.Down || hitPrediction.Direction == Direction.Up)
{
SpeedY = -SpeedY * Bounciness;
SpeedX = SpeedX * ImpactFriction;
}
else if (hitPrediction.Direction == Direction.Left || hitPrediction.Direction == Direction.Right)
{
SpeedX = -SpeedX * Bounciness;
SpeedY = SpeedY * ImpactFriction;
}
else
{
SpeedX = -SpeedX * Bounciness;
SpeedY = -SpeedY * Bounciness;
}
}
else
{
var oldLocation = Element.CopyBounds();
Element.MoveBy(dx, dy);
this.Angle = oldLocation.Center().CalculateAngleTo(Element.Center());
haveMovedSinceLastHitDetection = true;
}
}
public static HitPrediction PredictHit(SpaceTime r, SpacialElement Target, List <Type> hitDetectionTypes, float dx, float dy)
{
HitPrediction prediction = new HitPrediction();
if (dx == 0 && dy == 0)
{
prediction.Direction = Direction.None;
prediction.Type = HitType.None;
return(prediction);
}
if (dy > 0 && Target.Bottom() + dy >= r.Height)
{
prediction.Direction = Direction.Down;
prediction.Type = HitType.Boundary;
prediction.BoundsOfItemBeingHit = Rectangular.Create(Target.Left + dx, r.Bounds.Height + dy, 1, 1);
return(prediction);
}
else if (dx < 0 && Target.Left + dx <= 0)
{
prediction.Direction = Direction.Left;
prediction.Type = HitType.Boundary;
prediction.BoundsOfItemBeingHit = Rectangular.Create(-dx, Target.Top + dy, 1, 1);
return(prediction);
}
else if (dy < 0 && Target.Top + dy <= 0)
{
prediction.Direction = Direction.Up;
prediction.Type = HitType.Boundary;
prediction.BoundsOfItemBeingHit = Rectangular.Create(Target.Left + dx, -dy, 1, 1);
return(prediction);
}
else if (dx > 0 && Target.Right() + dx >= r.Width)
{
prediction.Direction = Direction.Right;
prediction.Type = HitType.Boundary;
prediction.BoundsOfItemBeingHit = Rectangular.Create(r.Width + dx, Target.Top + dy, 1, 1);
return(prediction);
}
var testArea = Rectangular.Create(Target.Left + dx, Target.Top + dy, Target.Width, Target.Height);
var match = (from t in r.Elements
where
t.IsOneOfThese(hitDetectionTypes) &&
Target != t &&
testArea.NumberOfPixelsThatOverlap(t) > 0
select t).OrderBy(t => t.Center().CalculateDistanceTo(Target.Center()));
if (match.Count() == 0)
{
prediction.Direction = Direction.None;
prediction.Type = HitType.None;
}
else
{
prediction.ElementHit = match.First();
prediction.Type = HitType.Element;
prediction.Direction = testArea.GetHitDirection(match.First().Bounds);
prediction.BoundsOfItemBeingHit = prediction.ElementHit.Bounds;
}
return(prediction);
}
public static IRectangular CopyBounds(this IRectangular rectangular) => Rectangular.Create(rectangular.Left, rectangular.Top, rectangular.Width, rectangular.Height);