From 71db52c5443a7bf82d9a23a770994a42b043be04 Mon Sep 17 00:00:00 2001
From: Leonardo Bishop <me@leonardobishop.com>
Date: Thu, 27 Jul 2023 22:11:31 +0100
Subject: Initial commit

---
 code/pawn/PlayerController.cs | 177 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 177 insertions(+)
 create mode 100644 code/pawn/PlayerController.cs

(limited to 'code/pawn/PlayerController.cs')

diff --git a/code/pawn/PlayerController.cs b/code/pawn/PlayerController.cs
new file mode 100644
index 0000000..d638bb0
--- /dev/null
+++ b/code/pawn/PlayerController.cs
@@ -0,0 +1,177 @@
+using Sandbox;
+using System;
+using System.Collections.Generic;
+
+namespace MurderGame;
+
+public class PlayerController : EntityComponent<Player>
+{
+	public int StepSize => 12;
+	public int GroundAngle => 45;
+	public int JumpSpeed => 300;
+	public float Gravity => 800f;
+	public float SpeedMultiplier { get; set; } = 1;
+
+	HashSet<string> ControllerEvents = new( StringComparer.OrdinalIgnoreCase );
+
+	bool Grounded => Entity.GroundEntity.IsValid();
+
+	public void Simulate( IClient cl )
+	{
+		ControllerEvents.Clear();
+
+		var movement = Entity.InputDirection.Normal;
+		var angles = Entity.ViewAngles.WithPitch( 0 );
+		var moveVector = Rotation.From( angles ) * movement * 320f;
+		var groundEntity = CheckForGround();
+		var team = Entity.CurrentTeam;
+
+		if ( groundEntity.IsValid() )
+		{
+			if ( !Grounded )
+			{
+				Entity.Velocity = Entity.Velocity.WithZ( 0 );
+				AddEvent( "grounded" );
+			}
+			var sprintMultiplier = TeamOperations.CanSprint( team ) ? (Input.Down( "run" ) ? 2.5f : 1f) : 1f;
+
+			Entity.Velocity = Accelerate( Entity.Velocity, moveVector.Normal, moveVector.Length, SpeedMultiplier * 200.0f * sprintMultiplier, 7.5f );
+			Entity.Velocity = ApplyFriction( Entity.Velocity, 4.0f );
+		}
+		else
+		{
+			Entity.Velocity = Accelerate( Entity.Velocity, moveVector.Normal, moveVector.Length, SpeedMultiplier * 100, 20f );
+			Entity.Velocity += Vector3.Down * Gravity * Time.Delta * (1/SpeedMultiplier);
+		}
+
+		if ( Input.Pressed( "jump" ) )
+		{
+			DoJump();
+		}
+
+		var mh = new MoveHelper( Entity.Position, Entity.Velocity );
+		mh.Trace = mh.Trace.Size( Entity.Hull ).Ignore( Entity );
+
+		if ( mh.TryMoveWithStep( Time.Delta, StepSize ) > 0 )
+		{
+			if ( Grounded )
+			{
+				mh.Position = StayOnGround( mh.Position );
+			}
+			Entity.Position = mh.Position;
+			Entity.Velocity = mh.Velocity;
+		}
+
+		Entity.GroundEntity = groundEntity;
+	}
+
+	void DoJump()
+	{
+		if ( Grounded )
+		{
+			Entity.Velocity = ApplyJump( Entity.Velocity, "jump" );
+		}
+	}
+
+	Entity CheckForGround()
+	{
+		if ( Entity.Velocity.z > 100f )
+			return null;
+
+		var trace = Entity.TraceBBox( Entity.Position, Entity.Position + Vector3.Down, 2f );
+
+		if ( !trace.Hit )
+			return null;
+
+		if ( trace.Normal.Angle( Vector3.Up ) > GroundAngle )
+			return null;
+
+		return trace.Entity;
+	}
+
+	Vector3 ApplyFriction( Vector3 input, float frictionAmount )
+	{
+		float StopSpeed = 100.0f;
+
+		var speed = input.Length;
+		if ( speed < 0.1f ) return input;
+
+		// Bleed off some speed, but if we have less than the bleed
+		// threshold, bleed the threshold amount.
+		float control = (speed < StopSpeed) ? StopSpeed : speed;
+
+		// Add the amount to the drop amount.
+		var drop = control * Time.Delta * frictionAmount;
+
+		// scale the velocity
+		float newspeed = speed - drop;
+		if ( newspeed < 0 ) newspeed = 0;
+		if ( newspeed == speed ) return input;
+
+		newspeed /= speed;
+		input *= newspeed;
+
+		return input;
+	}
+
+	Vector3 Accelerate( Vector3 input, Vector3 wishdir, float wishspeed, float speedLimit, float acceleration )
+	{
+		if ( speedLimit > 0 && wishspeed > speedLimit )
+			wishspeed = speedLimit;
+
+		var currentspeed = input.Dot( wishdir );
+		var addspeed = wishspeed - currentspeed;
+
+		if ( addspeed <= 0 )
+			return input;
+
+		var accelspeed = acceleration * Time.Delta * wishspeed;
+
+		if ( accelspeed > addspeed )
+			accelspeed = addspeed;
+
+		input += wishdir * accelspeed;
+
+		return input;
+	}
+
+	Vector3 ApplyJump( Vector3 input, string jumpType )
+	{
+		AddEvent( jumpType );
+
+		return input + Vector3.Up * JumpSpeed;
+	}
+
+	Vector3 StayOnGround( Vector3 position )
+	{
+		var start = position + Vector3.Up * 2;
+		var end = position + Vector3.Down * StepSize;
+
+		// See how far up we can go without getting stuck
+		var trace = Entity.TraceBBox( position, start );
+		start = trace.EndPosition;
+
+		// Now trace down from a known safe position
+		trace = Entity.TraceBBox( start, end );
+
+		if ( trace.Fraction <= 0 ) return position;
+		if ( trace.Fraction >= 1 ) return position;
+		if ( trace.StartedSolid ) return position;
+		if ( Vector3.GetAngle( Vector3.Up, trace.Normal ) > GroundAngle ) return position;
+
+		return trace.EndPosition;
+	}
+
+	public bool HasEvent( string eventName )
+	{
+		return ControllerEvents.Contains( eventName );
+	}
+
+	void AddEvent( string eventName )
+	{
+		if ( HasEvent( eventName ) )
+			return;
+
+		ControllerEvents.Add( eventName );
+	}
+}
-- 
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