212 lines
6.6 KiB
C#
212 lines
6.6 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Xml.Linq;
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using FarseerPhysics;
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using FarseerPhysics.Dynamics;
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using FarseerPhysics.Dynamics.Contacts;
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using FarseerPhysics.Dynamics.Joints;
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using Microsoft.Xna.Framework;
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namespace Subsurface.Items.Components
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{
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class Projectile : ItemComponent
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{
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private float launchImpulse;
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private bool doesStick;
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private PrismaticJoint stickJoint;
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private Body stickTarget;
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Attack attack;
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public List<Body> ignoredBodies;
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[HasDefaultValue(10.0f, false)]
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public float LaunchImpulse
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{
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get { return launchImpulse; }
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set { launchImpulse = value; }
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}
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[HasDefaultValue(false, false)]
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public bool CharacterUsable
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{
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get { return characterUsable; }
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set { characterUsable = value; }
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}
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[HasDefaultValue(false, false)]
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public bool DoesStick
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{
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get { return doesStick; }
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set { doesStick = value; }
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}
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public Projectile(Item item, XElement element)
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: base (item, element)
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{
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ignoredBodies = new List<Body>();
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//launchImpulse = ToolBox.GetAttributeFloat(element, "launchimpulse", 10.0f);
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//characterUsable = ToolBox.GetAttributeBool(element, "characterusable", false);
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foreach (XElement subElement in element.Elements())
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{
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if (subElement.Name.ToString().ToLower() != "attack") continue;
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attack = new Attack(subElement);
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}
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//bleedingDamage = ToolBox.GetAttributeFloat(element, "bleedingdamage", 0.0f);
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//bluntDamage = ToolBox.GetAttributeFloat(element, "bluntdamage", 0.0f);
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//doesStick = ToolBox.GetAttributeBool(element, "doesstick", false);
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}
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//public override void ConstructionActivate(Construction c, Vector2 modifier)
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//{
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// for (int i = 0; i < item.linkedTo.Count; i++)
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// item.linkedTo[i].RemoveLinked((MapEntity)item);
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// item.linkedTo.Clear();
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// ApplyStatusEffects(StatusEffect.Type.OnUse, 1.0f, null);
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// Launch(modifier+Vector2.Normalize(modifier)*launchImpulse);
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//}
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public override bool Use(float deltaTime, Character character = null)
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{
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if (character != null && !characterUsable) return false;
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//ApplyStatusEffects(ActionType.OnUse, 1.0f, character);
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Debug.WriteLine(item.body.Rotation);
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Launch(new Vector2(
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(float)Math.Cos(item.body.Rotation),
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(float)Math.Sin(item.body.Rotation)) * launchImpulse * item.body.Mass);
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return true;
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}
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private void Launch(Vector2 impulse)
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{
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item.body.Enabled = true;
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item.body.ApplyLinearImpulse(impulse);
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item.body.FarseerBody.OnCollision += OnProjectileCollision;
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item.body.FarseerBody.IsBullet = true;
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item.body.CollisionCategories = Physics.CollisionProjectile;
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item.body.CollidesWith = Physics.CollisionCharacter | Physics.CollisionWall;
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item.Drop();
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if (stickJoint != null && doesStick)
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{
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if (stickTarget!=null) item.body.FarseerBody.RestoreCollisionWith(stickTarget);
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Game1.World.RemoveJoint(stickJoint);
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stickJoint = null;
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}
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}
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public override void Update(float deltaTime, Camera cam)
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{
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if (stickJoint != null)
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{
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if (stickJoint.JointTranslation < 0.01f)
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{
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if (stickTarget!=null)
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{
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item.body.FarseerBody.RestoreCollisionWith(stickTarget);
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}
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Game1.World.RemoveJoint(stickJoint);
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stickJoint = null;
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isActive = false;
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}
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}
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else
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{
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isActive = false;
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}
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}
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private bool OnProjectileCollision(Fixture f1, Fixture f2, Contact contact)
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{
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if (ignoredBodies.Contains(f2.Body)) return false;
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AttackResult attackResult = new AttackResult(0.0f, 0.0f);
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if (attack!=null)
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{
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Limb limb;
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Structure structure;
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if ((limb = (f2.Body.UserData as Limb)) != null)
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{
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attackResult = attack.DoDamage(limb.character, item.SimPosition, 1.0f);
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}
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else if ((structure = (f2.Body.UserData as Structure)) != null)
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{
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attackResult = attack.DoDamage(structure, item.SimPosition, 1.0f);
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}
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}
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item.body.FarseerBody.OnCollision -= OnProjectileCollision;
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item.body.FarseerBody.IsBullet = false;
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item.body.CollisionCategories = Physics.CollisionMisc;
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item.body.CollidesWith = Physics.CollisionWall;
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ignoredBodies.Clear();
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if (attackResult.HitArmor)
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{
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item.body.LinearVelocity *= 0.5f;
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}
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else if (doesStick)
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{
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Vector2 normal = contact.Manifold.LocalNormal;
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Vector2 dir = new Vector2(
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(float)Math.Cos(item.body.Rotation),
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(float)Math.Sin(item.body.Rotation));
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if (Vector2.Dot(f1.Body.LinearVelocity, normal)<0 ) return StickToTarget(f2.Body, dir);
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}
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foreach (Item contained in item.ContainedItems)
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{
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contained.Condition = 0.0f;
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if (contained.body != null)
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{
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contained.body.SetTransform(item.SimPosition, contained.body.Rotation);
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}
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}
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return true;
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}
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private bool StickToTarget(Body targetBody, Vector2 axis)
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{
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if (stickJoint != null) return false;
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stickJoint = new PrismaticJoint(targetBody, item.body.FarseerBody, item.body.Position, axis, true);
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stickJoint.MotorEnabled = true;
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stickJoint.MaxMotorForce = 30.0f;
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stickJoint.LimitEnabled = true;
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stickJoint.UpperLimit = ConvertUnits.ToSimUnits(item.sprite.size.X*0.7f);
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item.body.FarseerBody.IgnoreCollisionWith(targetBody);
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stickTarget = targetBody;
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Game1.World.AddJoint(stickJoint);
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isActive = true;
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return false;
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}
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}
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}
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