41 lines
1.9 KiB
C#
41 lines
1.9 KiB
C#
|
using System.Linq;
|
||
|
|
using CultMath;
|
||
|
|
using static CultMath.math;
|
||
|
|
|
||
|
|
// The run's goal: whether a zone's boss lives, and so whether the exit gate is open. Engine-free and stateless; the
|
||
|
|
// answer is derived from Zone.Entities (the death path removes the dead, Zone.cs), so no "boss defeated" flag exists to
|
||
|
|
// disagree with it, and no presentation decides it.
|
||
|
|
public static class RunGoal
|
||
|
|
{
|
||
|
|
public static Entity Boss(Zone zone) => zone.Entities.FirstOrDefault(entity => entity.IsBoss);
|
||
|
|
|
||
|
|
public static bool BossAlive(Zone zone) => Boss(zone) != null;
|
||
|
|
|
||
|
|
// The exit gate is open in the galaxy's exit zone once that zone holds no living boss.
|
||
|
|
public static bool ExitOpen(Zone zone) =>
|
||
|
|
zone.Galaxy?.Exit != null && zone.GalaxyZone == zone.Galaxy.Exit && !BossAlive(zone);
|
||
|
|
|
||
|
|
// Where the exit gate sits: at the adjacency wormholes' radius (the zone's radius times the ratio), in the middle of
|
||
|
|
// the widest angular gap between them, so it shares a point with none. A zone with no neighbours gets the +x axis.
|
||
|
|
public static float2 ExitGatePosition(Zone zone, float wormholeDistanceRatio)
|
||
|
|
{
|
||
|
|
var radius = zone.Pack.Radius * wormholeDistanceRatio;
|
||
|
|
var angles = zone.GalaxyZone.AdjacentZones
|
||
|
|
.Select(adjacent => normalize(adjacent.Position - zone.GalaxyZone.Position))
|
||
|
|
.Select(direction => atan2(direction.y, direction.x))
|
||
|
|
.OrderBy(angle => angle)
|
||
|
|
.ToArray();
|
||
|
|
if (angles.Length == 0) return float2(radius, 0);
|
||
|
|
|
||
|
|
var bestAngle = 0f;
|
||
|
|
var bestGap = -1f;
|
||
|
|
for (var i = 0; i < angles.Length; i++)
|
||
|
|
{
|
||
|
|
var next = i + 1 < angles.Length ? angles[i + 1] : angles[0] + 2 * PI;
|
||
|
|
if (next - angles[i] <= bestGap) continue;
|
||
|
|
bestGap = next - angles[i];
|
||
|
|
bestAngle = angles[i] + bestGap / 2;
|
||
|
|
}
|
||
|
|
return float2(cos(bestAngle), sin(bestAngle)) * radius;
|
||
|
|
}
|
||
|
|
}
|