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Refactor handling of hit radii in projectiles.

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penev discovered that the RulesetLoaded functions of projectiles were
never being called, meaning that their blocking calculations were not
properly accounting for actors with large hitboxes.

The best fix for this is to change FindActorsOnLine to always account
for the largest actor's hit radius, rather than forcing callers to pass
the largest radius. Per the comment in Util.cs, as a result, move this
computation to ActorMap. I decided to simplify by not making a separate
calculation for actors that block projectiles only; this may cause a
small performance degradation as the search space is a bit larger.

Similarly to this, I've removed the ability to specify a search radius
manually. Because this is only a search radius, setting a value smaller
than the largest eligible actor makes no sense; that would lead to
completely inconsistent blocking. Setting a larger value, on the other
hand, would make no difference.

CreateEffectWarhead was the only place in core code any of these search
radii were set, and that's because 0 was a mysterious magic value that
made the warhead incapable of hitting actors. I replaced it with a
boolean flag that more clearly indicates the actual behaviour.

Fixes #14151.
This commit is contained in:
Alexis Hunt
2018-01-17 20:50:26 -05:00
committed by reaperrr
parent c4b0ad45e3
commit 08ad7d7f4e
31 changed files with 106 additions and 180 deletions
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21
OpenRA.Mods.Common/Projectiles/Railgun.cs
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@@ -90,29 +90,12 @@ namespace OpenRA.Mods.Common.Projectiles
[PaletteReference]
public readonly string HitAnimPalette = "effect";
[Desc("Scan radius for actors damaged by beam. If set to zero (default), it will automatically scale to the largest health shape.",
"Only set custom values if you know what you're doing.")]
public WDist AreaVictimScanRadius = WDist.Zero;
[Desc("Scan radius for actors with projectile-blocking trait. If set to zero (default), it will automatically scale",
"to the blocker with the largest health shape. Only set custom values if you know what you're doing.")]
public WDist BlockerScanRadius = WDist.Zero;
public IProjectile Create(ProjectileArgs args)
{
var bc = BeamPlayerColor ? Color.FromArgb(BeamColor.A, args.SourceActor.Owner.Color.RGB) : BeamColor;
var hc = HelixPlayerColor ? Color.FromArgb(HelixColor.A, args.SourceActor.Owner.Color.RGB) : HelixColor;
return new Railgun(args, this, bc, hc);
}
public void RulesetLoaded(Ruleset rules, WeaponInfo wi)
{
if (BlockerScanRadius == WDist.Zero)
BlockerScanRadius = Util.MinimumRequiredBlockerScanRadius(rules);
if (AreaVictimScanRadius == WDist.Zero)
AreaVictimScanRadius = Util.MinimumRequiredVictimScanRadius(rules);
}
}
public class Railgun : IProjectile
@@ -156,7 +139,7 @@ namespace OpenRA.Mods.Common.Projectiles
// Check for blocking actors
WPos blockedPos;
if (info.Blockable && BlocksProjectiles.AnyBlockingActorsBetween(args.SourceActor.World, target, args.Source,
info.BeamWidth, info.BlockerScanRadius, out blockedPos))
info.BeamWidth, out blockedPos))
target = blockedPos;
// Note: WAngle.Sin(x) = 1024 * Math.Sin(2pi/1024 * x)
@@ -205,7 +188,7 @@ namespace OpenRA.Mods.Common.Projectiles
args.Weapon.Impact(Target.FromPos(target), args.SourceActor, args.DamageModifiers);
else
{
var actors = world.FindActorsOnLine(args.Source, target, info.BeamWidth, info.AreaVictimScanRadius);
var actors = world.FindActorsOnLine(args.Source, target, info.BeamWidth);
foreach (var a in actors)
args.Weapon.Impact(Target.FromActor(a), args.SourceActor, args.DamageModifiers);
}