538 lines
19 KiB
C#
538 lines
19 KiB
C#
using FarseerPhysics;
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using FarseerPhysics.Collision;
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using FarseerPhysics.Common;
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using FarseerPhysics.Common.Decomposition;
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using FarseerPhysics.Dynamics;
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using FarseerPhysics.Dynamics.Contacts;
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using FarseerPhysics.Factories;
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using Microsoft.Xna.Framework;
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Linq;
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using Voronoi2;
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namespace Barotrauma
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{
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class SubmarineBody
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{
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public const float DamageDepth = -30000.0f;
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private const float PressureDamageMultiplier = 0.001f;
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private const float DamageMultiplier = 50.0f;
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private const float Friction = 0.2f, Restitution = 0.0f;
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public List<Vector2> HullVertices
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{
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get;
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private set;
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}
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private float depthDamageTimer;
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private readonly Submarine submarine;
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private readonly Body body;
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private Vector2? targetPosition;
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private float mass = 10000.0f;
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public Rectangle Borders
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{
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get;
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private set;
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}
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public Vector2 Velocity
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{
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get { return body.LinearVelocity; }
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set
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{
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if (!MathUtils.IsValid(value)) return;
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body.LinearVelocity = value;
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}
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}
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public Vector2 TargetPosition
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{
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//get { return targetPosition; }
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set
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{
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if (!MathUtils.IsValid(value)) return;
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targetPosition = value;
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}
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}
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public Vector2 Position
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{
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get { return ConvertUnits.ToDisplayUnits(body.Position); }
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}
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public bool AtDamageDepth
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{
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get { return Position.Y < DamageDepth; }
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}
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public SubmarineBody(Submarine sub)
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{
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this.submarine = sub;
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if (!Hull.hullList.Any())
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{
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body = BodyFactory.CreateRectangle(GameMain.World, 1.0f, 1.0f, 1.0f);
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DebugConsole.ThrowError("WARNING: no hulls found, generating a physics body for the submarine failed.");
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}
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else
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{
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List<Vector2> convexHull = GenerateConvexHull();
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HullVertices = convexHull;
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for (int i = 0; i < convexHull.Count; i++)
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{
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convexHull[i] = ConvertUnits.ToSimUnits(convexHull[i]);
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}
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convexHull.Reverse();
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//get farseer 'vertices' from vectors
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Vertices shapevertices = new Vertices(convexHull);
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AABB hullAABB = shapevertices.GetAABB();
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Borders = new Rectangle(
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(int)ConvertUnits.ToDisplayUnits(hullAABB.LowerBound.X),
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(int)ConvertUnits.ToDisplayUnits(hullAABB.UpperBound.Y),
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(int)ConvertUnits.ToDisplayUnits(hullAABB.Extents.X * 2.0f),
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(int)ConvertUnits.ToDisplayUnits(hullAABB.Extents.Y * 2.0f));
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//var triangulatedVertices = Triangulate.ConvexPartition(shapevertices, TriangulationAlgorithm.Bayazit);
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body = BodyFactory.CreateBody(GameMain.World, this);
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foreach (Hull hull in Hull.hullList)
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{
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Rectangle rect = hull.Rect;
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foreach (Structure wall in Structure.WallList)
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{
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if (!Submarine.RectsOverlap(wall.Rect, hull.Rect)) continue;
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Rectangle wallRect = wall.IsHorizontal ?
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new Rectangle(hull.Rect.X, wall.Rect.Y, hull.Rect.Width, wall.Rect.Height) :
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new Rectangle(wall.Rect.X, hull.Rect.Y, wall.Rect.Width, hull.Rect.Height);
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rect = Rectangle.Union(
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new Rectangle(wallRect.X, wallRect.Y - wallRect.Height, wallRect.Width, wallRect.Height),
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new Rectangle(rect.X, rect.Y - rect.Height, rect.Width, rect.Height));
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rect.Y = rect.Y + rect.Height;
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}
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FixtureFactory.AttachRectangle(
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ConvertUnits.ToSimUnits(rect.Width),
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ConvertUnits.ToSimUnits(rect.Height),
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5.0f,
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ConvertUnits.ToSimUnits(new Vector2(rect.X + rect.Width / 2, rect.Y - rect.Height / 2)),
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body, this);
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}
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}
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body.BodyType = BodyType.Dynamic;
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body.CollisionCategories = Physics.CollisionMisc | Physics.CollisionWall;
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body.CollidesWith = Physics.CollisionLevel | Physics.CollisionCharacter | Physics.CollisionProjectile;
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body.Restitution = Restitution;
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body.Friction = Friction;
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body.FixedRotation = true;
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body.Mass = mass;
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body.Awake = true;
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body.SleepingAllowed = false;
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body.IgnoreGravity = true;
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body.OnCollision += OnCollision;
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body.UserData = submarine;
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}
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private List<Vector2> GenerateConvexHull()
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{
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if (!Structure.WallList.Any())
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{
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return new List<Vector2> { new Vector2(-1.0f, 1.0f), new Vector2(1.0f, 1.0f), new Vector2(0.0f, -1.0f) };
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}
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List<Vector2> points = new List<Vector2>();
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Vector2 leftMost = Vector2.Zero;
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foreach (Structure wall in Structure.WallList)
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{
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for (int x = -1; x <= 1; x += 2)
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{
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for (int y = -1; y <= 1; y += 2)
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{
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Vector2 corner = new Vector2(wall.Rect.X + wall.Rect.Width / 2.0f, wall.Rect.Y - wall.Rect.Height / 2.0f);
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corner.X += x * wall.Rect.Width / 2.0f;
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corner.Y += y * wall.Rect.Height / 2.0f;
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if (points.Contains(corner)) continue;
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points.Add(corner);
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if (leftMost == Vector2.Zero || corner.X < leftMost.X) leftMost = corner;
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}
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}
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}
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List<Vector2> hullPoints = new List<Vector2>();
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Vector2 currPoint = leftMost;
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Vector2 endPoint;
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do
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{
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hullPoints.Add(currPoint);
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endPoint = points[0];
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for (int i = 1; i < points.Count; i++)
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{
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if ((currPoint == endPoint)
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|| (MathUtils.VectorOrientation(currPoint, endPoint, points[i]) == -1))
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{
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endPoint = points[i];
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}
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}
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currPoint = endPoint;
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}
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while (endPoint != hullPoints[0]);
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return hullPoints;
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}
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public void Update(float deltaTime)
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{
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if (targetPosition != null && targetPosition != Position)
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{
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float dist = Vector2.Distance((Vector2)targetPosition, Position);
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if (dist > 1000.0f) //immediately snap the sub to the target position if more than 1000.0f units away
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{
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Vector2 moveAmount = (Vector2)targetPosition - ConvertUnits.ToDisplayUnits(body.Position);
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ForceTranslate(moveAmount);
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GameMain.GameScreen.Cam.UpdateTransform(false);
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submarine.SetPrevTransform(submarine.Position);
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submarine.UpdateTransform();
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targetPosition = null;
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DisplaceCharacters(moveAmount);
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}
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else if (dist > 50.0f) //lerp the position if (50 < dist < 1000)
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{
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Vector2 moveAmount = Vector2.Normalize((Vector2)targetPosition - Position);
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moveAmount *= Math.Min(dist, 100.0f);
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ForceTranslate(moveAmount * deltaTime);
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}
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else
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{
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targetPosition = null;
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}
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}
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else
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{
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targetPosition = null;
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}
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//-------------------------
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Vector2 totalForce = CalculateBuoyancy();
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if (body.LinearVelocity.LengthSquared() > 0.000001f)
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{
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float dragCoefficient = 0.01f;
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float speedLength = (body.LinearVelocity == Vector2.Zero) ? 0.0f : body.LinearVelocity.Length();
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float drag = speedLength * speedLength * dragCoefficient * mass;
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totalForce += -Vector2.Normalize(body.LinearVelocity) * drag;
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}
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ApplyForce(totalForce);
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UpdateDepthDamage(deltaTime);
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}
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/// <summary>
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/// Immediately translates the position of the physics body, gamescreen camera and Character.Controlled.CursorPosition
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/// </summary>
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/// <param name="amount">Amount to move in display units</param>
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private void ForceTranslate(Vector2 amount)
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{
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body.SetTransform(body.Position + ConvertUnits.ToSimUnits(amount), 0.0f);
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if (Character.Controlled != null) Character.Controlled.CursorPosition += amount;
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GameMain.GameScreen.Cam.Position += amount;
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if (GameMain.GameScreen.Cam.TargetPos != Vector2.Zero) GameMain.GameScreen.Cam.TargetPos += amount;
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}
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/// <summary>
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/// Moves away any character that is inside the bounding box of the sub (but not inside it)
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/// </summary>
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/// <param name="subTranslation">The translation that was applied to the sub before doing the displacement
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/// (used for determining where to push the characters)</param>
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private void DisplaceCharacters(Vector2 subTranslation)
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{
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Rectangle worldBorders = Borders;
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worldBorders.Location += ConvertUnits.ToDisplayUnits(body.Position).ToPoint();
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Vector2 translateDir = Vector2.Normalize(subTranslation);
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foreach (Character c in Character.CharacterList)
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{
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if (c.AnimController.CurrentHull != null) continue;
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foreach (Limb limb in c.AnimController.Limbs)
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{
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//if the character isn't inside the bounding box, continue
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if (!Submarine.RectContains(worldBorders, limb.WorldPosition)) continue;
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//cast a line from the position of the character to the same direction as the translation of the sub
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//and see where it intersects with the bounding box
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Vector2? intersection = MathUtils.GetLineRectangleIntersection(limb.WorldPosition,
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limb.WorldPosition + translateDir*100000.0f, worldBorders);
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//should never be null when casting a line out from inside the bounding box
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Debug.Assert(intersection != null);
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//''+ translatedir'' in order to move the character slightly away from the wall
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c.AnimController.SetPosition(c.WorldPosition + ConvertUnits.ToSimUnits((Vector2)intersection - limb.WorldPosition) + translateDir);
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return;
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}
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}
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}
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private Vector2 CalculateBuoyancy()
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{
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float waterVolume = 0.0f;
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float volume = 0.0f;
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foreach (Hull hull in Hull.hullList)
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{
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waterVolume += hull.Volume;
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volume += hull.FullVolume;
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}
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float waterPercentage = volume==0.0f ? 0.0f : waterVolume / volume;
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float neutralPercentage = 0.07f;
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float buoyancy = Math.Max(neutralPercentage - waterPercentage, -neutralPercentage*2.0f);
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buoyancy *= mass;
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return new Vector2(0.0f, buoyancy*10.0f);
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}
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public void ApplyForce(Vector2 force)
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{
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body.ApplyForce(force);
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}
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public void SetPosition(Vector2 position)
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{
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body.SetTransform(ConvertUnits.ToSimUnits(position), 0.0f);
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}
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private void UpdateDepthDamage(float deltaTime)
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{
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if (Position.Y > DamageDepth) return;
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float depth = DamageDepth - Position.Y;
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depth = Math.Min(depth, 40000.0f);
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// float prevTimer = depthDamageTimer;
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depthDamageTimer -= deltaTime*Math.Min(depth,20000)*PressureDamageMultiplier;
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//if (prevTimer>5.0f && depthDamageTimer<=5.0f)
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//{
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// SoundPlayer.PlayDamageSound(DamageSoundType.Pressure, 50.0f,);
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//}
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if (depthDamageTimer > 0.0f) return;
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Vector2 damagePos = Vector2.Zero;
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if (Rand.Int(2)==0)
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{
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damagePos = new Vector2(
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(Rand.Int(2) == 0) ? Borders.X : Borders.X+Borders.Width,
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Rand.Range(Borders.Y - Borders.Height, Borders.Y));
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}
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else
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{
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damagePos = new Vector2(
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Rand.Range(Borders.X, Borders.X + Borders.Width),
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(Rand.Int(2) == 0) ? Borders.Y : Borders.Y - Borders.Height);
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}
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damagePos += submarine.Position + Submarine.HiddenSubPosition;
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SoundPlayer.PlayDamageSound(DamageSoundType.Pressure, 50.0f, damagePos, 10000.0f);
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GameMain.GameScreen.Cam.Shake = depth * PressureDamageMultiplier * 0.1f;
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Explosion.RangedStructureDamage(damagePos, depth * PressureDamageMultiplier * 50.0f, depth * PressureDamageMultiplier);
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//SoundPlayer.PlayDamageSound(DamageSoundType.StructureBlunt, Rand.Range(0.0f, 100.0f), damagePos, 5000.0f);
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depthDamageTimer = 10.0f;
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}
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public bool OnCollision(Fixture f1, Fixture f2, Contact contact)
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{
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VoronoiCell cell = f2.Body.UserData as VoronoiCell;
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if (cell == null)
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{
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Limb limb = f2.Body.UserData as Limb;
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if (limb == null) return true;
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bool collision = HandleLimbCollision(contact, limb);
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if (collision && limb.Mass > 100.0f)
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{
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Vector2 normal = Vector2.Normalize(body.Position - limb.SimPosition);
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float impact = Math.Min(Vector2.Dot(Velocity - limb.LinearVelocity, -normal), 5.0f);
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ApplyImpact(impact * Math.Min(limb.Mass / 200.0f, 1), -normal, contact);
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}
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return collision;
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}
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var collisionNormal = Vector2.Normalize(ConvertUnits.ToDisplayUnits(body.Position) - cell.Center);
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float wallImpact = Vector2.Dot(Velocity, -collisionNormal);
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ApplyImpact(wallImpact, -collisionNormal, contact);
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return true;
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}
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private bool HandleLimbCollision(Contact contact, Limb limb)
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{
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if (limb.character.Submarine != null) return false;
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Vector2 normal2;
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FixedArray2<Vector2> points;
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contact.GetWorldManifold(out normal2, out points);
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Vector2 normalizedVel = limb.character.AnimController.RefLimb.LinearVelocity == Vector2.Zero ?
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Vector2.Zero : Vector2.Normalize(limb.character.AnimController.RefLimb.LinearVelocity);
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Vector2 targetPos = ConvertUnits.ToDisplayUnits(points[0] - normal2);
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Hull newHull = Hull.FindHull(targetPos, null);
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if (newHull == null)
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{
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targetPos = ConvertUnits.ToDisplayUnits(points[0] - normalizedVel);
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newHull = Hull.FindHull(targetPos, null);
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if (newHull == null) return true;
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}
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var gaps = newHull.ConnectedGaps;
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targetPos = limb.character.WorldPosition;
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bool gapFound = false;
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foreach (Gap gap in gaps)
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{
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if (gap.Open == 0.0f || gap.IsRoomToRoom) continue;
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if (gap.ConnectedWall != null)
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{
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int sectionIndex = gap.ConnectedWall.FindSectionIndex(gap.Position);
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if (sectionIndex > -1 && !gap.ConnectedWall.SectionBodyDisabled(sectionIndex)) continue;
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}
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if (gap.isHorizontal)
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{
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if (targetPos.Y < gap.WorldRect.Y && targetPos.Y > gap.WorldRect.Y - gap.WorldRect.Height &&
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Math.Abs(gap.WorldRect.Center.X-targetPos.X)<200.0f)
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{
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gapFound = true;
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break;
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}
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}
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else
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{
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if (targetPos.X > gap.WorldRect.X && targetPos.X < gap.WorldRect.Right &&
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Math.Abs(gap.WorldRect.Y - gap.WorldRect.Height/2 - targetPos.Y) < 200.0f)
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{
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gapFound = true;
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break;
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}
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}
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}
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if (!gapFound) return true;
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var ragdoll = limb.character.AnimController;
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ragdoll.FindHull(newHull.WorldPosition);
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return false;
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}
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private void ApplyImpact(float impact, Vector2 direction, Contact contact)
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{
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if (impact < 3.0f) return;
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Vector2 tempNormal;
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FarseerPhysics.Common.FixedArray2<Vector2> worldPoints;
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contact.GetWorldManifold(out tempNormal, out worldPoints);
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Vector2 lastContactPoint = worldPoints[0];
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SoundPlayer.PlayDamageSound(DamageSoundType.StructureBlunt, impact * 10.0f, ConvertUnits.ToDisplayUnits(lastContactPoint));
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GameMain.GameScreen.Cam.Shake = impact * 2.0f;
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Vector2 impulse = direction * impact * 0.5f;
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float length = impulse.Length();
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if (length > 5.0f) impulse = (impulse / length) * 5.0f;
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foreach (Character c in Character.CharacterList)
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{
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if (c.AnimController.CurrentHull == null) continue;
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if (impact > 2.0f) c.StartStun((impact - 2.0f) * 0.1f);
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foreach (Limb limb in c.AnimController.Limbs)
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{
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if (c.AnimController.LowestLimb == limb) continue;
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limb.body.ApplyLinearImpulse(limb.Mass * impulse);
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}
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}
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foreach (Item item in Item.ItemList)
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{
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if (item.Submarine != submarine || item.CurrentHull == null || item.body == null) continue;
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item.body.ApplyLinearImpulse(item.body.Mass * impulse);
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}
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Explosion.RangedStructureDamage(ConvertUnits.ToDisplayUnits(lastContactPoint), impact * 50.0f, impact * DamageMultiplier);
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}
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}
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}
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