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using System;
using Celesteia.Game.Components;
using Celesteia.Game.Components.Physics;
using Celesteia.Game.Planets;
using Microsoft.Xna.Framework;
using MonoGame.Extended;
using MonoGame.Extended.Entities;
using MonoGame.Extended.Entities.Systems;
namespace Celesteia.Game.Systems.Physics {
public class PhysicsWorldCollisionSystem : EntityUpdateSystem {
private ChunkMap _chunkMap;
public PhysicsWorldCollisionSystem(ChunkMap chunkMap) : base(Aspect.All(typeof(TargetPosition), typeof(PhysicsEntity), typeof(CollisionBox))) {
_chunkMap = chunkMap;
}
private ComponentMapper<Transform2> transformMapper;
private ComponentMapper<TargetPosition> targetPositionMapper;
private ComponentMapper<PhysicsEntity> physicsEntityMapper;
private ComponentMapper<CollisionBox> collisionBoxMapper;
public override void Initialize(IComponentMapperService mapperService)
{
transformMapper = mapperService.GetMapper<Transform2>();
targetPositionMapper = mapperService.GetMapper<TargetPosition>();
physicsEntityMapper = mapperService.GetMapper<PhysicsEntity>();
collisionBoxMapper = mapperService.GetMapper<CollisionBox>();
}
public override void Update(GameTime gameTime)
{
foreach (int entityId in ActiveEntities) {
Transform2 transform = transformMapper.Get(entityId);
TargetPosition targetPosition = targetPositionMapper.Get(entityId);
PhysicsEntity physicsEntity = physicsEntityMapper.Get(entityId);
CollisionBox collisionBox = collisionBoxMapper.Get(entityId);
collisionBox.Update(targetPosition.Target);
int minX = (int)MathF.Floor(collisionBox.Bounds.Center.X - (collisionBox.Bounds.Width / 2f));
int maxX = (int)MathF.Ceiling(collisionBox.Bounds.Center.X + (collisionBox.Bounds.Width / 2f));
int minY = (int)MathF.Floor(collisionBox.Bounds.Center.Y - (collisionBox.Bounds.Height / 2f));
int maxY = (int)MathF.Ceiling(collisionBox.Bounds.Center.Y + (collisionBox.Bounds.Height / 2f));
bool collLeft = false;
bool collRight = false;
bool collUp = false;
bool collDown = false;
for (int i = minX; i < maxX; i++)
for (int j = minY; j < maxY; j++) {
RectangleF? blockBox = _chunkMap.TestBoundingBox(i, j);
if (blockBox.HasValue) {
RectangleF inter = RectangleF.Intersection(collisionBox.Bounds, blockBox.Value);
if (inter.IsEmpty) continue;
if (inter.Width < inter.Height) {
collLeft = blockBox.Value.Center.X < collisionBox.Bounds.Center.X;
collRight = blockBox.Value.Center.X > collisionBox.Bounds.Center.X;
targetPosition.Target += new Vector2(blockBox.Value.Center.X < collisionBox.Bounds.Center.X ? inter.Width : -inter.Width, 0f);
} else {
collUp = blockBox.Value.Center.Y < collisionBox.Bounds.Center.Y;
collDown = blockBox.Value.Center.Y > collisionBox.Bounds.Center.Y;
targetPosition.Target += new Vector2(0f, blockBox.Value.Center.Y < collisionBox.Bounds.Center.Y ? inter.Height : -inter.Height);
}
collisionBox.Update(targetPosition.Target);
}
}
physicsEntity.CollidingDown = collDown;
physicsEntity.CollidingUp = collUp;
physicsEntity.CollidingLeft = collLeft;
physicsEntity.CollidingRight = collRight;
}
}
}
}
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