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code/tools/Rope.cs

@@ -0,0 +1,122 @@
+namespace Sandbox.Tools
+{
+	[Library( "tool_rope", Title = "Rope", Description = "Join two things together with a rope", Group = "construction" )]
+	public partial class RopeTool : BaseTool
+	{
+		private PhysicsBody targetBody;
+		private int targetBone;
+		private Vector3 localOrigin1;
+		private Vector3 globalOrigin1;
+
+		public override void Simulate()
+		{
+			if ( !Host.IsServer )
+				return;
+
+			using ( Prediction.Off() )
+			{
+				if ( !Input.Pressed( InputButton.Attack1 ) )
+					return;
+
+				var startPos = Owner.EyePos;
+				var dir = Owner.EyeRot.Forward;
+
+				var tr = Trace.Ray( startPos, startPos + dir * MaxTraceDistance )
+					.Ignore( Owner )
+					.Run();
+
+				if ( !tr.Hit )
+					return;
+
+				if ( !tr.Body.IsValid() )
+					return;
+
+				if ( !tr.Entity.IsValid() )
+					return;
+
+				if ( tr.Entity is not ModelEntity )
+					return;
+
+				if ( !targetBody.IsValid() )
+				{
+					targetBody = tr.Body;
+					targetBone = tr.Bone;
+					globalOrigin1 = tr.EndPos;
+					localOrigin1 = tr.Body.Transform.PointToLocal( globalOrigin1 );
+
+					CreateHitEffects( tr.EndPos );
+
+					return;
+				}
+
+				if ( targetBody == tr.Body )
+					return;
+
+				var rope = Particles.Create( "particles/rope.vpcf" );
+
+				if ( targetBody.Entity.IsWorld )
+				{
+					rope.SetPosition( 0, localOrigin1 );
+				}
+				else
+				{
+					rope.SetEntityBone( 0, targetBody.Entity, targetBone, new Transform( localOrigin1 * (1.0f / targetBody.Entity.Scale) ) );
+				}
+
+				var localOrigin2 = tr.Body.Transform.PointToLocal( tr.EndPos );
+
+				if ( tr.Entity.IsWorld )
+				{
+					rope.SetPosition( 1, localOrigin2 );
+				}
+				else
+				{
+					rope.SetEntityBone( 1, tr.Entity, tr.Bone, new Transform( localOrigin2 * (1.0f / tr.Entity.Scale) ) );
+				}
+
+				var spring = PhysicsJoint.Spring
+					.From( targetBody, localOrigin1 )
+					.To( tr.Body, localOrigin2 )
+					.WithFrequency( 5.0f )
+					.WithDampingRatio( 0.7f )
+					.WithReferenceMass( targetBody.Mass )
+					.WithMinRestLength( 0 )
+					.WithMaxRestLength( tr.EndPos.Distance( globalOrigin1 ) )
+					.WithCollisionsEnabled()
+					.Create();
+
+				spring.EnableAngularConstraint = false;
+				spring.OnBreak( () =>
+				{
+					rope?.Destroy( true );
+					spring.Remove();
+				} );
+
+				CreateHitEffects( tr.EndPos );
+
+				Reset();
+			}
+		}
+
+		private void Reset()
+		{
+			targetBody = null;
+			targetBone = -1;
+			localOrigin1 = default;
+		}
+
+		public override void Activate()
+		{
+			base.Activate();
+
+			Reset();
+		}
+
+		public override void Deactivate()
+		{
+			base.Deactivate();
+
+			Reset();
+		}
+	}
+}