476 lines
17 KiB
C#
476 lines
17 KiB
C#
using FarseerPhysics;
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using Microsoft.Xna.Framework;
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using Microsoft.Xna.Framework.Graphics;
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using System;
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using System.Collections.Generic;
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namespace Barotrauma.Particles
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{
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class Particle
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{
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private ParticlePrefab prefab;
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public delegate void OnChangeHullHandler(Vector2 position, Hull currentHull);
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public OnChangeHullHandler OnChangeHull;
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private Vector2 position;
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private Vector2 prevPosition;
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private Vector2 velocity;
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private float rotation;
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private float prevRotation;
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private float angularVelocity;
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private Vector2 dragVec = Vector2.Zero;
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private int dragWait = 0;
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private Vector2 size;
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private Vector2 sizeChange;
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private Color color;
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private bool changeColor;
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private int spriteIndex;
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private float totalLifeTime;
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private float lifeTime;
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private float startDelay;
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private Vector2 velocityChange;
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private Vector2 velocityChangeWater;
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private Vector2 drawPosition;
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private float drawRotation;
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private Hull currentHull;
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private List<Gap> hullGaps;
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private bool hasSubEmitters;
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private List<ParticleEmitter> subEmitters = new List<ParticleEmitter>();
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private float animState;
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private int animFrame;
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private float collisionUpdateTimer;
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public bool HighQualityCollisionDetection;
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public ParticlePrefab.DrawTargetType DrawTarget
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{
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get { return prefab.DrawTarget; }
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}
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public ParticleBlendState BlendState
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{
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get { return prefab.BlendState; }
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}
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public float StartDelay
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{
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get { return startDelay; }
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set { startDelay = MathHelper.Clamp(value, Prefab.StartDelayMin, prefab.StartDelayMax); }
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}
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public Vector2 Size
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{
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get { return size; }
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set { size = value; }
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}
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public Hull CurrentHull
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{
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get { return currentHull; }
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}
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public ParticlePrefab Prefab
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{
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get { return prefab; }
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}
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public void Init(ParticlePrefab prefab, Vector2 position, Vector2 speed, float rotation, Hull hullGuess = null)
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{
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this.prefab = prefab;
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spriteIndex = Rand.Int(prefab.Sprites.Count);
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animState = 0;
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animFrame = 0;
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dragWait = 0;
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dragVec = Vector2.Zero;
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currentHull = Hull.FindHull(position, hullGuess);
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this.position = position;
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prevPosition = position;
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drawPosition = position;
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velocity = MathUtils.IsValid(speed) ? speed : Vector2.Zero;
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if (currentHull?.Submarine != null)
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{
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velocity += ConvertUnits.ToDisplayUnits(currentHull.Submarine.Velocity);
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}
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this.rotation = rotation + Rand.Range(prefab.StartRotationMinRad, prefab.StartRotationMaxRad);
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prevRotation = rotation;
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angularVelocity = Rand.Range(prefab.AngularVelocityMinRad, prefab.AngularVelocityMaxRad);
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totalLifeTime = prefab.LifeTime;
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lifeTime = prefab.LifeTime;
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startDelay = Rand.Range(prefab.StartDelayMin, prefab.StartDelayMax);
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size = prefab.StartSizeMin + (prefab.StartSizeMax - prefab.StartSizeMin) * Rand.Range(0.0f, 1.0f);
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sizeChange = prefab.SizeChangeMin + (prefab.SizeChangeMax - prefab.SizeChangeMin) * Rand.Range(0.0f, 1.0f);
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color = prefab.StartColor;
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changeColor = prefab.StartColor != prefab.EndColor;
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velocityChange = prefab.VelocityChangeDisplay;
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velocityChangeWater = prefab.VelocityChangeWaterDisplay;
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HighQualityCollisionDetection = false;
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OnChangeHull = null;
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subEmitters.Clear();
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hasSubEmitters = false;
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foreach (ParticleEmitterPrefab emitterPrefab in prefab.SubEmitters)
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{
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subEmitters.Add(new ParticleEmitter(emitterPrefab));
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hasSubEmitters = true;
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}
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if (prefab.UseCollision)
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{
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hullGaps = currentHull == null ? new List<Gap>() : currentHull.ConnectedGaps;
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}
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if (prefab.RotateToDirection)
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{
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this.rotation = MathUtils.VectorToAngle(new Vector2(velocity.X, -velocity.Y));
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prevRotation = rotation;
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}
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}
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public bool Update(float deltaTime)
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{
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if (startDelay > 0.0f)
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{
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startDelay -= deltaTime;
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return true;
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}
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prevPosition = position;
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prevRotation = rotation;
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//over 3 times faster than position += velocity * deltatime
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position.X += velocity.X * deltaTime;
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position.Y += velocity.Y * deltaTime;
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if (prefab.RotateToDirection)
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{
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if (velocityChange != Vector2.Zero || angularVelocity != 0.0f)
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{
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Vector2 relativeVel = velocity;
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if (currentHull?.Submarine != null)
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{
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relativeVel -= ConvertUnits.ToDisplayUnits(currentHull.Submarine.Velocity);
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}
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rotation = MathUtils.VectorToAngle(new Vector2(relativeVel.X, -relativeVel.Y));
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}
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}
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else
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{
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rotation += angularVelocity * deltaTime;
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}
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bool inWater = (currentHull == null || (currentHull.Submarine != null && position.Y - currentHull.Submarine.DrawPosition.Y < currentHull.Surface));
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if (inWater)
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{
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velocity.X += velocityChangeWater.X * deltaTime;
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velocity.Y += velocityChangeWater.Y * deltaTime;
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if (prefab.WaterDrag > 0.0f)
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{
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ApplyDrag(prefab.WaterDrag, deltaTime);
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}
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}
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else
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{
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velocity.X += velocityChange.X * deltaTime;
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velocity.Y += velocityChange.Y * deltaTime;
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if (prefab.Drag > 0.0f)
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{
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ApplyDrag(prefab.Drag, deltaTime);
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}
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}
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size.X += sizeChange.X * deltaTime;
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size.Y += sizeChange.Y * deltaTime;
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if (changeColor)
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{
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color = Color.Lerp(prefab.EndColor, prefab.StartColor, lifeTime / prefab.LifeTime);
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}
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if (prefab.Sprites[spriteIndex] is SpriteSheet)
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{
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animState += deltaTime;
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int frameCount = ((SpriteSheet)prefab.Sprites[spriteIndex]).FrameCount;
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animFrame = (int)Math.Min(Math.Floor(animState / prefab.AnimDuration * frameCount), frameCount - 1);
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}
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lifeTime -= deltaTime;
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if (lifeTime <= 0.0f || color.A <= 0 || size.X <= 0.0f || size.Y <= 0.0f) { return false; }
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if (hasSubEmitters)
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{
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foreach (ParticleEmitter emitter in subEmitters)
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{
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emitter.Emit(deltaTime, position, currentHull);
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}
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}
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if (!prefab.UseCollision) { return true; }
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if (HighQualityCollisionDetection)
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{
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return CollisionUpdate();
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}
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else
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{
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collisionUpdateTimer -= deltaTime;
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if (collisionUpdateTimer <= 0.0f)
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{
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//more frequent collision updates if the particle is moving fast
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collisionUpdateTimer = 0.5f - Math.Min((Math.Abs(velocity.X) + Math.Abs(velocity.Y)) * 0.01f, 0.45f);
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return CollisionUpdate();
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}
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}
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return true;
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}
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private bool CollisionUpdate()
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{
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if (currentHull == null)
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{
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Hull collidedHull = Hull.FindHull(position);
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if (collidedHull != null)
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{
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if (prefab.DeleteOnCollision) return false;
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OnWallCollisionOutside(collidedHull);
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}
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}
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else
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{
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Rectangle hullRect = currentHull.WorldRect;
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Vector2 collisionNormal = Vector2.Zero;
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if (velocity.Y < 0.0f && position.Y - prefab.CollisionRadius * size.Y < hullRect.Y - hullRect.Height)
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{
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if (prefab.DeleteOnCollision) return false;
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collisionNormal = new Vector2(0.0f, 1.0f);
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}
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else if (velocity.Y > 0.0f && position.Y + prefab.CollisionRadius * size.Y > hullRect.Y)
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{
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if (prefab.DeleteOnCollision) return false;
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collisionNormal = new Vector2(0.0f, -1.0f);
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}
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else if (velocity.X < 0.0f && position.X - prefab.CollisionRadius * size.X < hullRect.X)
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{
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if (prefab.DeleteOnCollision) return false;
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collisionNormal = new Vector2(1.0f, 0.0f);
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}
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else if (velocity.X > 0.0f && position.X + prefab.CollisionRadius * size.X > hullRect.Right)
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{
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if (prefab.DeleteOnCollision) return false;
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collisionNormal = new Vector2(-1.0f, 0.0f);
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}
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if (collisionNormal != Vector2.Zero)
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{
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bool gapFound = false;
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foreach (Gap gap in hullGaps)
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{
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if (gap.Open <= 0.9f || gap.IsHorizontal != (collisionNormal.X != 0.0f)) continue;
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if (gap.IsHorizontal)
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{
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if (gap.WorldRect.Y < position.Y || gap.WorldRect.Y - gap.WorldRect.Height > position.Y) continue;
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int gapDir = Math.Sign(gap.WorldRect.Center.X - currentHull.WorldRect.Center.X);
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if (Math.Sign(velocity.X) != gapDir || Math.Sign(position.X - currentHull.WorldRect.Center.X) != gapDir) continue;
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}
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else
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{
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if (gap.WorldRect.X > position.X || gap.WorldRect.Right < position.X) continue;
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float hullCenterY = currentHull.WorldRect.Y - currentHull.WorldRect.Height / 2;
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int gapDir = Math.Sign(gap.WorldRect.Y - hullCenterY);
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if (Math.Sign(velocity.Y) != gapDir || Math.Sign(position.Y - hullCenterY) != gapDir) continue;
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}
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gapFound = true;
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break;
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}
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if (!gapFound)
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{
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OnWallCollisionInside(currentHull, collisionNormal);
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}
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else
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{
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Hull newHull = Hull.FindHull(position, currentHull);
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if (newHull != currentHull)
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{
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currentHull = newHull;
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hullGaps = currentHull == null ? new List<Gap>() : currentHull.ConnectedGaps;
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OnChangeHull?.Invoke(position, currentHull);
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}
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}
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}
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}
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return true;
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}
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private void ApplyDrag(float dragCoefficient, float deltaTime)
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{
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if (velocity.LengthSquared() < dragVec.LengthSquared())
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{
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velocity = Vector2.Zero;
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return;
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}
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if (Math.Abs(velocity.X) < 0.0001f && Math.Abs(velocity.Y) < 0.0001f) return;
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//TODO: some better way to handle particle drag
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//this doesn't work that well because the drag vector is only updated every 0.5 seconds, allowing the particle to accelerate way more than it should
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//(e.g. a falling particle can freely accelerate for 0.5 seconds before the drag takes effect)
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dragWait--;
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if (dragWait <= 0)
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{
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dragWait = 30;
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float speed = velocity.Length();
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dragVec = (velocity / speed) * Math.Min(speed * speed * dragCoefficient * deltaTime, 1.0f);
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}
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velocity -= dragVec;
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}
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private void OnWallCollisionInside(Hull prevHull, Vector2 collisionNormal)
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{
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Rectangle prevHullRect = prevHull.WorldRect;
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Vector2 subVel = prevHull?.Submarine != null ? ConvertUnits.ToDisplayUnits(prevHull.Submarine.Velocity) : Vector2.Zero;
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velocity -= subVel;
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if (Math.Abs(collisionNormal.X) > Math.Abs(collisionNormal.Y))
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{
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if (collisionNormal.X > 0.0f)
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{
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position.X = Math.Max(position.X, prevHullRect.X + prefab.CollisionRadius * size.X);
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}
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else
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{
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position.X = Math.Min(position.X, prevHullRect.Right - prefab.CollisionRadius * size.X);
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}
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velocity.X = Math.Sign(collisionNormal.X) * Math.Abs(velocity.X) * prefab.Restitution;
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velocity.Y *= (1.0f - prefab.Friction);
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}
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else
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{
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if (collisionNormal.Y > 0.0f)
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{
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position.Y = Math.Max(position.Y, prevHullRect.Y - prevHullRect.Height + prefab.CollisionRadius * size.Y);
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}
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else
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{
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position.Y = Math.Min(position.Y, prevHullRect.Y - prefab.CollisionRadius * size.Y);
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}
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velocity.X *= (1.0f - prefab.Friction);
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velocity.Y = Math.Sign(collisionNormal.Y) * Math.Abs(velocity.Y) * prefab.Restitution;
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}
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velocity += subVel;
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}
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private void OnWallCollisionOutside(Hull collisionHull)
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{
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Rectangle hullRect = collisionHull.WorldRect;
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Vector2 center = new Vector2(hullRect.X + hullRect.Width /2, hullRect.Y - hullRect.Height / 2);
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if (position.Y < center.Y)
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{
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position.Y = hullRect.Y - hullRect.Height - prefab.CollisionRadius;
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velocity.X *= (1.0f - prefab.Friction);
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velocity.Y = -velocity.Y * prefab.Restitution;
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}
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else if (position.Y > center.Y)
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{
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position.Y = hullRect.Y + prefab.CollisionRadius;
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velocity.X *= (1.0f - prefab.Friction);
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velocity.Y = -velocity.Y * prefab.Restitution;
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}
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if (position.X < center.X)
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{
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position.X = hullRect.X - prefab.CollisionRadius;
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velocity.X = -velocity.X * prefab.Restitution;
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velocity.Y *= (1.0f - prefab.Friction);
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}
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else if (position.X > center.X)
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{
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position.X = hullRect.X + hullRect.Width + prefab.CollisionRadius;
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velocity.X = -velocity.X * prefab.Restitution;
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velocity.Y *= (1.0f - prefab.Friction);
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}
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velocity *= prefab.Restitution;
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}
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public void UpdateDrawPos()
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{
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drawPosition = Timing.Interpolate(prevPosition, position);
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drawRotation = Timing.Interpolate(prevRotation, rotation);
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}
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public void Draw(SpriteBatch spriteBatch)
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{
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Vector2 drawSize = size;
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if (prefab.GrowTime > 0.0f && totalLifeTime - lifeTime < prefab.GrowTime)
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{
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drawSize *= ((totalLifeTime - lifeTime) / prefab.GrowTime);
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}
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if (prefab.Sprites[spriteIndex] is SpriteSheet)
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{
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((SpriteSheet)prefab.Sprites[spriteIndex]).Draw(
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spriteBatch, animFrame,
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new Vector2(drawPosition.X, -drawPosition.Y),
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color * (color.A / 255.0f),
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prefab.Sprites[spriteIndex].Origin, drawRotation,
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drawSize, SpriteEffects.None, prefab.Sprites[spriteIndex].Depth);
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}
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else
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{
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prefab.Sprites[spriteIndex].Draw(spriteBatch,
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new Vector2(drawPosition.X, -drawPosition.Y),
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color * (color.A / 255.0f),
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prefab.Sprites[spriteIndex].Origin, drawRotation,
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drawSize, SpriteEffects.None, prefab.Sprites[spriteIndex].Depth);
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}
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}
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}
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}
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