public override void ResolveConstraint(World world)
{
Vector_2d Dist = world.PointMassList[PointA].Pos.Sub(world.PointMassList[PointB].Pos);
float Distance = (float)Math.Sqrt(Dist.Dot(Dist));
float Difference = (UsedDistance - Distance) / Distance;
if (Math.Abs(Difference) > DistanceHeld)//Give before taking damadge
{
Damadge -= 5.0F * Math.Abs(Difference) * world.DeltaTime * world.DeltaConstraint;
Damadge = Math.Max(0, Damadge);//For colour
}
else
{
Damadge = Math.Min(Damadge + (1.0F * world.DeltaTime * world.DeltaConstraint), 100);
}
const float Give = 0;
if (Math.Abs(Distance - UsedDistance) > Give)//Give before moving
{
Vector_2d translate = new Vector_2d((float)(Dist.X * Difference), (float)(Dist.Y * Difference));
translate = translate.Mult(world.DeltaConstraint);
translate = translate.Mult(0.5F);
float scalarP1 = (world.PointMassList[PointA].InverseMass / (world.PointMassList[PointA].InverseMass + world.PointMassList[PointB].InverseMass)) * Stiffness;
float scalarP2 = Stiffness - scalarP1;
//world.PointMassList[PointA].Accerate(translate.Mult(scalarP1),world);
//world.PointMassList[PointB].Accerate(translate.Mult(scalarP2).Inverted(), world);
world.PointMassList[PointA].Pos = world.PointMassList[PointA].Pos.Add(translate.Mult(scalarP1));
world.PointMassList[PointB].Pos = world.PointMassList[PointB].Pos.Sub(translate.Mult(scalarP2));
}
}
public PointMass(Vector_2d loc, float mass = 10, float force = 10)
{
Pos = loc;
OldPos = loc;
SetMass(mass);
ForceApplied = force;
}
public void VelocityColl(PointMass A, Connection B)
{
Vector_2d pos = get_line_intersection(A.Pos, A.OldPos, PointMassList[B.PointA].Pos, PointMassList[B.PointB].Pos);
if (pos != null)
{
float COR = 0.98F;//Coefficent of restetution
Vector_2d ConB = PointMassList[B.PointA].Pos.Sub(PointMassList[B.PointB].Pos);
Vector_2d ConBPerpNormal = ConB.Perpendicular().Div((float)Math.Sqrt(ConB.Dot(ConB)));
Vector_2d Velocity = A.OldPos.Sub(A.Pos);
Vector_2d newVelocity = PointMassList[B.PointA].OldPos.Sub(PointMassList[B.PointA].Pos);
newVelocity = newVelocity.Add(PointMassList[B.PointB].OldPos.Sub(PointMassList[B.PointB].Pos));
//newVelocity = newVelocity.Sub(Velocity);
float Distribution = (float)Math.Sqrt(pos.Sub(PointMassList[B.PointA].Pos).Dot(pos.Sub(PointMassList[B.PointA].Pos))) / B.UsedDistance;
A.Pos = A.OldPos.Add(newVelocity.Mult(COR));
PointMassList[B.PointA].Pos = PointMassList[B.PointA].OldPos.Add(Velocity.Mult(1 - Distribution));
PointMassList[B.PointB].Pos = PointMassList[B.PointB].OldPos.Add(Velocity.Mult(Distribution));
B.Damadge -= (A.Mass * A.DamadgeMulti);
if (A.State == 6 && !A.Grabbed)
{
int conA = Game.World.AddConnection(new ConnectionStaticDistance(Game.World, A.Id, B.PointA));
int conB = Game.World.AddConnection(new ConnectionStaticDistance(Game.World, A.Id, B.PointB));
Game.World.ConnectionList[conA].Render = false;
Game.World.ConnectionList[conB].Render = false;
PointMassList[A.Id].Grabbed = true;
if (A.Player != -1)
{
PlayerList[A.Player].JointActuators.Add(new int[] { conA, A.Id });
PlayerList[A.Player].JointActuators.Add(new int[] { conB, A.Id });
}
}
}
}
//precalculated
public ConnectionStaticDistance(World world, int a, int b)
: base(world, a, b)
{
Vector_2d Dist = world.PointMassList[PointA].Pos.Sub(world.PointMassList[PointB].Pos);
//Resting distances
UsedDistance = (float)Math.Sqrt((double)Dist.Dot(Dist));
//Stiffness = 1;
}
public void Coll(PointMass a, PointMass b)
{
Vector_2d diff = a.Pos.Sub(b.Pos);
float InputForce = 1.0F / (float)Math.Sqrt(diff.Dot(diff));
diff.Div(InputForce);
diff.Mult(0.5F);
a.Accerate(diff, this);
b.Accerate(diff.Inverted(), this);
}
public ConnectionPushClose(World world, int a, int b, float MinAngle, int cona, int conb)
: base(world, a, b)
{
Render = false;
Vector_2d Dist = world.PointMassList[PointA].Pos.Sub(world.PointMassList[PointB].Pos);
float asqd = world.ConnectionList[cona].UsedDistance * world.ConnectionList[cona].UsedDistance;
float bsqd = world.ConnectionList[conb].UsedDistance * world.ConnectionList[conb].UsedDistance;
float distance = (float)Math.Sqrt((float)(asqd + bsqd - (2 * world.ConnectionList[cona].UsedDistance * world.ConnectionList[conb].UsedDistance * Math.Cos((float)MinAngle * (3.14 / 180)))));
//Cosine rule
UsedDistance = distance;
}
public ConnectionPushClose(World world, int a, int b, float MinDistanceSet = -1)
: base(world, a, b)
{
Render = false;
Vector_2d Dist = world.PointMassList[PointA].Pos.Sub(world.PointMassList[PointB].Pos);
//Minamum distance to apply
if (MinDistanceSet == -1)
{
UsedDistance = (float)Math.Sqrt((double)Dist.Dot(Dist));
}
else
{
UsedDistance = MinDistanceSet;
}
}
public void Intergrate(World world, float friction = 0)
{
friction /= InverseMass;
Vector_2d newOld = Pos;
Vector_2d Friction = new Vector_2d(2 - friction, 2 - friction); //Normal air friction
Vector_2d FrictionOld = new Vector_2d(1 - friction, 1 - friction); //Normal air friction
if (OnGround)
{
//Friction.X = 1 + friction;
//FrictionOld.X = friction;
}
Pos = Pos.Mult(Friction).Sub(OldPos.Mult(FrictionOld));
Pos = Pos.Add(Acceleration.Mult(world.DeltaTime * world.DeltaTime));
OldPos = newOld;
Acceleration = new Vector_2d(0, 0);
}
public override void ResolveConstraint(World world)
{
Vector_2d Dist = world.PointMassList[PointA].Pos.Sub(world.PointMassList[PointB].Pos);
float DistDot = Dist.Dot(Dist);
float Distance = (float)Math.Sqrt(DistDot);
float Difference = (UsedDistance - Distance) / Distance;
if (Difference > 0)
{
Vector_2d translate = new Vector_2d((float)(Dist.X * Difference), (float)(Dist.Y * Difference));
//translate = translate.Mult(Force);
translate = translate.Mult(0.5F).Mult(world.DeltaConstraint);//.Mult(world.DeltaTime);
float scalarP1 = (world.PointMassList[PointA].InverseMass / (world.PointMassList[PointA].InverseMass + world.PointMassList[PointB].InverseMass)) * Stiffness;
float scalarP2 = Stiffness - scalarP1;
world.PointMassList[PointA].Pos = world.PointMassList[PointA].Pos.Add(translate.Mult(scalarP1));
world.PointMassList[PointB].Pos = world.PointMassList[PointB].Pos.Sub(translate.Mult(scalarP2));
}
}
//precalculated
public ConnectionRotateToDirection(World world, int a, int mid, int b, bool direction /* 0 = 90, 1 = 270*/)
: base(world, a, b)
{
Direction = direction;
PointMid = mid;
Vector_2d Dist = world.PointMassList[PointA].Pos.Sub(world.PointMassList[PointB].Pos);
UsedDistance = (float)Math.Sqrt((double)Dist.Dot(Dist));
LargestDistance = 1;//To solve bugs
foreach (int k in Game.World.PointMassList[PointMid].Connected)
{
if (k != -1)
{
if (Game.World.ConnectionList[k].PointA == a || Game.World.ConnectionList[k].PointB == a)
{
LargestDistance += Game.World.ConnectionList[k].UsedDistance;
}
if (Game.World.ConnectionList[k].PointA == b || Game.World.ConnectionList[k].PointB == b)
{
LargestDistance += Game.World.ConnectionList[k].UsedDistance;
}
}
}
float adis = 0;
float bdis = 0;
foreach (int k in Game.World.PointMassList[PointMid].Connected)
{
if (k != -1)
{
if (Game.World.ConnectionList[k].PointA == a || Game.World.ConnectionList[k].PointB == a)
{
adis = Game.World.ConnectionList[k].UsedDistance;
}
if (Game.World.ConnectionList[k].PointA == b || Game.World.ConnectionList[k].PointB == b)
{
bdis = Game.World.ConnectionList[k].UsedDistance;
}
}
}
SmallestDistance = (float)Math.Sqrt((float)((adis * adis) + (bdis * bdis) - (2 * adis * bdis * Math.Cos((float)Game.World.PointMassList[PointMid].JointLimit * (3.14 / 180)))));
}
public Vector_2d get_line_intersection(Vector_2d p0, Vector_2d p1, Vector_2d p2, Vector_2d p3)
{
Vector_2d s1 = new Vector_2d();
Vector_2d s2 = new Vector_2d();
s1.X = p1.X - p0.X; s1.Y = p1.Y - p0.Y;
s2.X = p3.X - p2.X; s2.Y = p3.Y - p2.Y;
float s, t;
s = (-s1.Y * (p0.X - p2.X) + s1.X * (p0.Y - p2.Y)) / (-s2.X * s1.Y + s1.X * s2.Y);
t = (s2.X * (p0.Y - p2.Y) - s2.Y * (p0.X - p2.X)) / (-s2.X * s1.Y + s1.X * s2.Y);
if (s > 0 && s < 1 && t > 0 && t < 1)
{
return(new Vector_2d(p0.X + (t * s1.X), p0.Y + (t * s1.Y)));
}
return(null); // No collision
}
public void CheckBounds(World world)
{
bool Affect = false;
Vector_2d Displace = new Vector_2d();
if (Pos.Y < world.BufferSize)
{
Affect = true;
Displace.Y = (world.BufferSize - Pos.Y);
}
if (Math.Abs(Pos.Y - world.BufferSize) < 5 || Pos.Y < world.BufferSize)
{
OnGround = true;
}
else
{
OnGround = false;
}
if (Pos.Y > world.Size.Y - world.BufferSize)
{
Affect = true;
Displace.Y = ((world.Size.Y - world.BufferSize) - Pos.Y);
}
if (Pos.X < world.BufferSize)
{
Affect = true;
Displace.X = (world.BufferSize - Pos.X);
}
if (Pos.X > world.Size.X - world.BufferSize)
{
Affect = true;
Displace.X = ((world.Size.X - world.BufferSize) - Pos.X);
}
if (Affect)
{
Vector_2d newOld = Pos.Add(Displace.Mult(2F));
Pos = OldPos;
OldPos = newOld;
}
}
public override void ResolveConstraint(World world)
{
Vector_2d Avec = world.PointMassList[PointMid].Pos.Sub(world.PointMassList[PointA].Pos).Normal().Perpendicular();
//Whats it with?
if (Direction)
{
Avec.Invert();
}
Vector_2d Bvec = world.PointMassList[PointB].Pos.Sub(world.PointMassList[PointMid].Pos).Normal();
float Dot = Avec.Dot(Bvec);
Dot = (float)Math.Sqrt(Math.Abs(Dot)) * (Dot / Math.Abs(Dot));
float Normal = (Dot / (float)(Math.Sqrt(Avec.Dot(Avec))));
const float Give = 0;//1.0F/10.0F;
if (Math.Abs(1.0F - Normal) > Give)
{
if (Normal < 0)
{
//Extend
UsedDistance = LargestDistance;
}
if (Normal > 0)
{
//Contract
UsedDistance = SmallestDistance;
}
if (Normal == 0)
{
world.PointMassList[PointA].Pos.X += 1;
world.PointMassList[PointB].Pos.X -= 1;
}
base.ResolveConstraint(world);
}
}
public SpawnPlayer(World world, Vector_2d loc_floor, Player player = null)
{
//Lergs
float LegWidth = 30;
int LowerLegA = world.AddPointMass(new PointMass(new Vector_2d(loc_floor.X + LegWidth, loc_floor.Y), 50));
int LowerLegB = world.AddPointMass(new PointMass(new Vector_2d(loc_floor.X - LegWidth, loc_floor.Y), 50));
float LegTaper = 6;
float LegHeight = 60;
int MidLegA = world.AddPointMass(new PointMass(new Vector_2d(loc_floor.X + LegWidth - LegTaper, loc_floor.Y + (LegHeight / 2))));
int MidLegB = world.AddPointMass(new PointMass(new Vector_2d(loc_floor.X - LegWidth + LegTaper, loc_floor.Y + (LegHeight / 2))));
float HipSize = 15;
int HigherLegA = world.AddPointMass(new PointMass(new Vector_2d(loc_floor.X + HipSize, loc_floor.Y + LegHeight)));
int HigherLegB = world.AddPointMass(new PointMass(new Vector_2d(loc_floor.X - HipSize, loc_floor.Y + LegHeight)));
int LowerBody = world.AddPointMass(new PointMass(new Vector_2d(loc_floor.X, loc_floor.Y + LegHeight + HipSize)));
int LowerHip = world.AddPointMass(new PointMass(new Vector_2d(loc_floor.X, loc_floor.Y + LegHeight - HipSize)));
int LowerLegACon = world.AddConnection(new ConnectionStaticDistance(world, LowerLegA, MidLegA));
int LowerLegBCon = world.AddConnection(new ConnectionStaticDistance(world, LowerLegB, MidLegB));
int HigherLegACon = world.AddConnection(new ConnectionStaticDistance(world, MidLegA, HigherLegA));
int HigherLegBCon = world.AddConnection(new ConnectionStaticDistance(world, MidLegB, HigherLegB));
int HipConA = world.AddConnection(new ConnectionStaticDistance(world, HigherLegA, LowerBody));
int HipConB = world.AddConnection(new ConnectionStaticDistance(world, HigherLegB, LowerBody));
int HipConC = world.AddConnection(new ConnectionStaticDistance(world, HigherLegA, LowerHip));
int HipConD = world.AddConnection(new ConnectionStaticDistance(world, HigherLegB, LowerHip));
int HipConE = world.AddConnection(new ConnectionStaticDistance(world, HigherLegA, HigherLegB));
int HipConF = world.AddConnection(new ConnectionStaticDistance(world, LowerBody, LowerHip));
//world.AddConnection(new ConnectionPushClose(world, LowerLegA, HigherLegA, 90, LowerLegACon, HigherLegACon));
//world.AddConnection(new ConnectionPushClose(world, LowerLegB, HigherLegB, 90, LowerLegBCon, HigherLegBCon));
//world.AddConnection(new ConnectionPushClose(world, LowerBody, MidLegA, 90, HipConA, HigherLegACon));
//world.AddConnection(new ConnectionPushClose(world, LowerBody, MidLegB, 90, HipConB, HigherLegBCon));
//Body
float BodyHeight = 30;
int MidBody = world.AddPointMass(new PointMass(new Vector_2d(loc_floor.X, loc_floor.Y + LegHeight + HipSize + (BodyHeight / 2))));
int HigherBody = world.AddPointMass(new PointMass(new Vector_2d(loc_floor.X, loc_floor.Y + LegHeight + HipSize + BodyHeight)));
int ShoulderWidth = 15;
int ShoulderHeight = 10;
int ShoulderA = world.AddPointMass(new PointMass(new Vector_2d(loc_floor.X + ShoulderWidth, loc_floor.Y + LegHeight + HipSize + BodyHeight + ShoulderHeight)));
int ShoulderB = world.AddPointMass(new PointMass(new Vector_2d(loc_floor.X - ShoulderWidth, loc_floor.Y + LegHeight + HipSize + BodyHeight + ShoulderHeight)));
float NeckHeight = 30;
int LowerNeck = world.AddPointMass(new PointMass(new Vector_2d(loc_floor.X, loc_floor.Y + LegHeight + HipSize + BodyHeight + ShoulderHeight + (NeckHeight / 2))));
int HigherNeck = world.AddPointMass(new PointMass(new Vector_2d(loc_floor.X, loc_floor.Y + LegHeight + HipSize + BodyHeight + ShoulderHeight + (NeckHeight))));
int HeadSize = 20;
int TopHead = world.AddPointMass(new PointMass(new Vector_2d(loc_floor.X, loc_floor.Y + LegHeight + HipSize + BodyHeight + ShoulderHeight + NeckHeight + HeadSize)));
int HeadA = world.AddPointMass(new PointMass(new Vector_2d(loc_floor.X + HeadSize, loc_floor.Y + LegHeight + HipSize + BodyHeight + ShoulderHeight + NeckHeight + (HeadSize / 2))));
int HeadB = world.AddPointMass(new PointMass(new Vector_2d(loc_floor.X - HeadSize, loc_floor.Y + LegHeight + HipSize + BodyHeight + ShoulderHeight + NeckHeight + (HeadSize / 2))));
int ArmTaper = 30;
int UpperArmDrop = 10;
int LowerArmDrop = 20;
int MidArmA = world.AddPointMass(new PointMass(new Vector_2d(loc_floor.X + ShoulderWidth + (ArmTaper / 2), loc_floor.Y + LegHeight + HipSize + BodyHeight + ShoulderHeight - UpperArmDrop)));
int MidArmB = world.AddPointMass(new PointMass(new Vector_2d(loc_floor.X - (ShoulderWidth + (ArmTaper / 2)), loc_floor.Y + LegHeight + HipSize + BodyHeight + ShoulderHeight - UpperArmDrop)));
int LowerArmA = world.AddPointMass(new PointMass(new Vector_2d(loc_floor.X + ShoulderWidth + ArmTaper, loc_floor.Y + LegHeight + HipSize + BodyHeight + ShoulderHeight - (UpperArmDrop + LowerArmDrop))));
int LowerArmB = world.AddPointMass(new PointMass(new Vector_2d(loc_floor.X - (ShoulderWidth + ArmTaper), loc_floor.Y + LegHeight + HipSize + BodyHeight + ShoulderHeight - (UpperArmDrop + LowerArmDrop))));
int LowerBodyCon = world.AddConnection(new ConnectionStaticDistance(world, LowerBody, MidBody));
int HigherBodyCon = world.AddConnection(new ConnectionStaticDistance(world, MidBody, HigherBody));
int ShoulderConA = world.AddConnection(new ConnectionStaticDistance(world, HigherBody, ShoulderA));
int ShoulderConB = world.AddConnection(new ConnectionStaticDistance(world, HigherBody, ShoulderB));
int ShoulderConC = world.AddConnection(new ConnectionStaticDistance(world, HigherBody, LowerNeck));
int ShoulderConE = world.AddConnection(new ConnectionStaticDistance(world, LowerNeck, ShoulderA));
int ShoulderConF = world.AddConnection(new ConnectionStaticDistance(world, LowerNeck, ShoulderB));
int ShoulderCon = world.AddConnection(new ConnectionStaticDistance(world, ShoulderA, ShoulderB));
int NeckConA = world.AddConnection(new ConnectionStaticDistance(world, LowerNeck, HigherNeck));
int NeckConB = world.AddConnection(new ConnectionStaticDistance(world, HigherNeck, TopHead));
int HeadMidCon = world.AddConnection(new ConnectionStaticDistance(world, HeadA, HeadB));
int HeadUpperSideConA = world.AddConnection(new ConnectionStaticDistance(world, HeadA, TopHead));
int HeadUpperSideConB = world.AddConnection(new ConnectionStaticDistance(world, HeadB, TopHead));
int HeadLowerSideConA = world.AddConnection(new ConnectionStaticDistance(world, HeadA, HigherNeck));
int HeadLowerSideConB = world.AddConnection(new ConnectionStaticDistance(world, HeadB, HigherNeck));
int ArmUpperConA = world.AddConnection(new ConnectionStaticDistance(world, ShoulderA, MidArmA));
int ArmUpperConB = world.AddConnection(new ConnectionStaticDistance(world, ShoulderB, MidArmB));
int ArmLowerConA = world.AddConnection(new ConnectionStaticDistance(world, MidArmA, LowerArmA));
int ArmLowerConB = world.AddConnection(new ConnectionStaticDistance(world, MidArmB, LowerArmB));
if (player != null)
{
player.JointsId.Add(new int[] { HigherLegA, MidLegA, LowerLegA });
player.JointsId.Add(new int[] { HigherLegB, MidLegB, LowerLegB });
player.JointsId.Add(new int[] { LowerBody, HigherLegA, MidLegA });
player.JointsId.Add(new int[] { LowerBody, HigherLegB, MidLegB });
player.JointsId.Add(new int[] { LowerHip, LowerBody, MidBody });
player.JointsId.Add(new int[] { LowerBody, MidBody, HigherBody });
player.JointsId.Add(new int[] { MidBody, HigherBody, LowerNeck });
player.JointsId.Add(new int[] { HigherBody, LowerNeck, HigherNeck });
player.JointsId.Add(new int[] { LowerNeck, HigherNeck, TopHead });
player.JointsId.Add(new int[] { HigherBody, ShoulderA, MidArmA });
player.JointsId.Add(new int[] { HigherBody, ShoulderB, MidArmB });
player.JointsId.Add(new int[] { ShoulderA, MidArmA, LowerArmA });
player.JointsId.Add(new int[] { ShoulderB, MidArmB, LowerArmB });
player.JointsId.Add(new int[] { MidArmA, LowerArmA, -1 });
world.PointMassList[LowerArmA].State = 5;
player.JointsId.Add(new int[] { MidArmB, LowerArmB, -1 });
world.PointMassList[LowerArmB].State = 5;
player.PointMasses.Add(LowerLegA);
player.PointMasses.Add(LowerLegB);
player.PointMasses.Add(HigherLegA);
player.PointMasses.Add(HigherLegB);
player.PointMasses.Add(LowerBody);
player.PointMasses.Add(LowerHip);
player.Connctions.Add(LowerLegACon);
player.Connctions.Add(LowerLegBCon);
player.Connctions.Add(HigherLegACon);
player.Connctions.Add(HigherLegBCon);
player.Connctions.Add(HipConA);
player.Connctions.Add(HipConB);
player.Connctions.Add(HipConC);
player.Connctions.Add(HipConD);
player.Connctions.Add(HipConE);
player.Connctions.Add(HipConF);
//Body/head
player.PointMasses.Add(MidBody);
player.PointMasses.Add(HigherBody);
player.PointMasses.Add(ShoulderA);
player.PointMasses.Add(ShoulderB);
player.PointMasses.Add(LowerNeck);
player.PointMasses.Add(HigherNeck);
player.PointMasses.Add(TopHead);
player.PointMasses.Add(HeadA);
player.PointMasses.Add(HeadB);
//Arms
player.PointMasses.Add(MidArmA);
player.PointMasses.Add(MidArmB);
player.PointMasses.Add(LowerArmA);
player.PointMasses.Add(LowerArmB);
player.Connctions.Add(LowerBodyCon);
player.Connctions.Add(HigherBodyCon);
player.Connctions.Add(ShoulderConA);
player.Connctions.Add(ShoulderConB);
player.Connctions.Add(ShoulderConC);
player.Connctions.Add(ShoulderConE);
player.Connctions.Add(ShoulderConF);
player.Connctions.Add(ShoulderCon);
player.Connctions.Add(NeckConA);
player.Connctions.Add(NeckConB);
player.Connctions.Add(HeadMidCon);
player.Connctions.Add(HeadUpperSideConA);
player.Connctions.Add(HeadUpperSideConB);
player.Connctions.Add(HeadLowerSideConA);
player.Connctions.Add(HeadLowerSideConB);
player.Connctions.Add(ArmUpperConA);
player.Connctions.Add(ArmUpperConB);
player.Connctions.Add(ArmLowerConA);
player.Connctions.Add(ArmLowerConB);
}
}
public float Dot(Vector_2d v)
{
return((X * v.X) + (Y * v.Y));
}
public Vector_2d Div(Vector_2d v)
{
return(new Vector_2d(X / v.X, Y / v.Y));
}
public Vector_2d Mult(Vector_2d v)
{
return(new Vector_2d(X * v.X, Y * v.Y));
}
public Vector_2d Sub(Vector_2d v)
{
return(new Vector_2d(X - v.X, Y - v.Y));
}
public Vector_2d Add(Vector_2d v)
{
return(new Vector_2d(X + v.X, Y + v.Y));
}
public void Accerate(Vector_2d vec, World world)
{
Acceleration = Acceleration.Add(vec);
}
public void Spawn(World world, Vector_2d pos)
{
new SpawnPlayer(world, pos, this);
}