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using Sandbox;
namespace MurderGame;
public partial class Player
{
public Entity Using { get; protected set; }
protected virtual void TickPlayerUse()
{
// This is serverside only
if ( !Game.IsServer )
{
return;
}
// Turn prediction off
using ( Prediction.Off() )
{
if ( Input.Pressed( "use" ) )
{
Using = FindUsable();
if ( Using == null )
{
UseFail();
return;
}
}
if ( !Input.Down( "use" ) )
{
StopUsing();
return;
}
if ( !Using.IsValid() )
{
return;
}
// If we move too far away or something we should probably ClearUse()?
//
// If use returns true then we can keep using it
//
if ( Using is IUse use && use.OnUse( this ) )
{
return;
}
StopUsing();
}
}
/// <summary>
/// Player tried to use something but there was nothing there.
/// Tradition is to give a disappointed boop.
/// </summary>
protected virtual void UseFail()
{
PlaySound( "player_use_fail" );
}
/// <summary>
/// If we're using an entity, stop using it
/// </summary>
protected virtual void StopUsing()
{
Using = null;
}
/// <summary>
/// Returns if the entity is a valid usable entity
/// </summary>
protected bool IsValidUseEntity( Entity e )
{
if ( e == null )
{
return false;
}
if ( e is not IUse use )
{
return false;
}
if ( !use.IsUsable( this ) )
{
return false;
}
return true;
}
/// <summary>
/// Find a usable entity for this player to use
/// </summary>
protected virtual Entity FindUsable()
{
// First try a direct 0 width line
var tr = Trace.Ray( EyePosition, EyePosition + EyeRotation.Forward * 85 )
.Ignore( this )
.Run();
// See if any of the parent entities are usable if we ain't.
var ent = tr.Entity;
while ( ent.IsValid() && !IsValidUseEntity( ent ) )
{
ent = ent.Parent;
}
// Nothing found, try a wider search
if ( !IsValidUseEntity( ent ) )
{
tr = Trace.Ray( EyePosition, EyePosition + EyeRotation.Forward * 85 )
.Radius( 2 )
.Ignore( this )
.Run();
// See if any of the parent entities are usable if we ain't.
ent = tr.Entity;
while ( ent.IsValid() && !IsValidUseEntity( ent ) )
{
ent = ent.Parent;
}
}
// Still no good? Bail.
if ( !IsValidUseEntity( ent ) )
{
return null;
}
return ent;
}
}
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