<cat>Code.Editor</cat>⤶ <title>Hammer Gizmos</title> # Hammer Gizmos You can create interactive [Gizmos](Gizmos) in Hammer for your [game's map entities](Linking_Entities_to_Hammer). This gives you a great way to visualize what your entities will do before baking your map. <upload src="a5727/8db4d842202997c.mp4" size="2142726" name="gizmos_hammer.mp4" /> ```csharp public partial class DoorEntity public static void DrawGizmos( EditorContext context ) { // Get some key values from the entity var model = context.Target.GetProperty( "model" ).GetValue<string>(); var distance = context.Target.GetProperty( "distance" ).GetValue<int>(); // Animate the distance var angle = MathF.Abs( MathF.Sin( RealTime.Now ) ) * distance; // Ghost Gizmo.Draw.Color = Color.White.WithAlpha( 0.6f ); Gizmo.Draw.Model( model, new Transform( default, Rotation.FromYaw( angle ) ) ); } } ``` ## Interactive Gizmos As well as displaying your entities' properties, you can also set them directly from interacting with gizmos. ```csharp public static void DrawGizmos( EditorContext context ) { var radiusProp = context.Target.GetProperty( "Radius" ); var radius = radiusProp.As.Float; // Draw custom circle radius control using ( Gizmo.Scope() ) { var cameraDelta = Gizmo.Transform.Position - Gizmo.Camera.Position; Gizmo.Transform = Gizmo.Transform.WithRotation( Rotation.LookAt( cameraDelta ) ); Gizmo.Hitbox.Circle( 0, Vector3.Forward, radius + 5, radius ); Gizmo.Draw.Color = Gizmo.Colors.Left.WithAlpha( Gizmo.IsHovered ? 1 : 0.3f ); Gizmo.Draw.LineThickness = 4; Gizmo.Draw.IgnoreDepth = true; Gizmo.Draw.LineCircle( 0, radius + 4, sections: 64 ); if ( Gizmo.IsPressed ) { var pos = Gizmo.GetPositionOnPlane( 0, Gizmo.Transform.NormalToLocal( cameraDelta.Normal ), Gizmo.CurrentRay ) ?? 0; // update value radius = pos.Length; radiusProp.SetValue( radius ); } } } ``` ## EditorContext EditorContext provides a way for your game code to know details about what's going on in the map editor. ### Selection ``` public static void DrawGizmos( EditorContext context ) { // Display only if our entity is selected if ( context.IsSelected ) return; // Draw gizmos .. } ``` ### Finding Targets Many entities target other entities by name, you can use FindTarget for this. ```csharp [Property( "target" ), Title( "Target Entity" )] public EntityTarget TargetEntity { get; set; } public static void DrawGizmos( EditorContext context ) { var targetProp = context.Target.GetProperty( "target" ); var targetName = targetProp.GetValue<string>(); // Find the target entity by name var targetObject = context.FindTarget( targetName ); if ( targetObject != null ) { // get the position of the target in local space var local = Gizmo.Transform.ToLocal( targetObject.Transform ); var arrowSize = local.Position.Normal * 20.0f; // draw an arrow to it Gizmo.Draw.Color = Color.Random; Gizmo.Draw.LineThickness = 2; Gizmo.Draw.Line( 0, local.Position ); Gizmo.Draw.SolidCone( local.Position - arrowSize, arrowSize, 10.0f ); } } ```