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Fix for #7083: Fly stops turning when target is inside the turn radius

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This commit is contained in:
portablestew
2019-01-11 20:31:06 -08:00
committed by reaperrr
parent 95dc9cb1d2
commit 2d4bad66ae
2 changed files with 30 additions and 7 deletions
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28
OpenRA.Mods.Common/Activities/Air/Fly.cs
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@@ -123,6 +123,26 @@ namespace OpenRA.Mods.Common.Activities
var targetAltitude = aircraft.CenterPosition.Z + aircraft.Info.CruiseAltitude.Length - self.World.Map.DistanceAboveTerrain(aircraft.CenterPosition).Length;
if (aircraft.CenterPosition.Z < targetAltitude)
desiredFacing = aircraft.Facing;
else
{
// Using the turn rate, compute a hypothetical circle traced by a continuous turn.
// If it contains the destination point, it's unreachable without more complex manuvering.
var turnRadius = CalculateTurnRadius(aircraft.MovementSpeed, aircraft.TurnSpeed);
// The current facing is a tangent of the minimal turn circle.
// Make a perpendicular vector, and use it to locate the turn's center.
var turnCenterFacing = aircraft.Facing;
turnCenterFacing += Util.GetNearestFacing(aircraft.Facing, desiredFacing) > 0 ? 64 : -64;
var turnCenterDir = new WVec(0, -1024, 0).Rotate(WRot.FromFacing(turnCenterFacing));
turnCenterDir *= turnRadius;
turnCenterDir /= 1024;
// Compare with the target point, and keep flying away if it's inside the circle.
var turnCenter = aircraft.CenterPosition + turnCenterDir;
if ((checkTarget.CenterPosition - turnCenter).HorizontalLengthSquared < turnRadius * turnRadius)
desiredFacing = aircraft.Facing;
}
FlyToward(self, aircraft, desiredFacing, aircraft.Info.CruiseAltitude);
@@ -133,5 +153,13 @@ namespace OpenRA.Mods.Common.Activities
{
yield return target;
}
public static int CalculateTurnRadius(int speed, int turnSpeed)
{
// turnSpeed -> divide into 256 to get the number of ticks per complete rotation
// speed -> multiply to get distance travelled per rotation (circumference)
// 45 -> divide by 2*pi to get the turn radius: 45==256/(2*pi), with some extra leeway
return 45 * speed / turnSpeed;
}
}
}