Children of entities

You can find this sample in the tutorial project: Menu → Child entities

Explanation

This C# basics tutorial covers how to get an entities children. Since those children are also entities, we can retrieve their children too.

Code

using Stride.Core.Mathematics;
using Stride.Engine;

namespace CSharpBeginner.Code
{
    /// <summary>
    /// This script is used to demonstrate how we can get child entities of an entity
    /// </summary>
    public class ChildEntitiesDemo : SyncScript
    {
        private Entity child0;
        private Entity child1;

        public override void Start()
        {
            // We can get a child by using GetChild(). This takes an index number starting at 0
            child0 = Entity.GetChild(0);
            child1 = Entity.GetChild(1);

            // If we would try to get Child 3 (which doesn't exist), we would get an exception
            // var nonExistingChild = Entity.GetChild(2); 
        }

        public override void Update()
        {
            // We store some drawing positions
            int drawX = 350, drawY = 230, increment = 70;

            // We print the name of the our entity
            DebugText.Print(Entity.Name, new Int2(drawX, drawY));

            // We loop over all the children of our entity using GetChildren()
            // NOTE: This does not include any subchildren of those children
            foreach (var child in Entity.GetChildren())
            {
                // We print the name of the child
                drawY += increment;
                DebugText.Print(child.Name, new Int2(drawX + increment, drawY));

                // It is possible that this child, also has children. We now loop over these 'subchildren' and print their name too
                foreach (var subChild in child.GetChildren())
                {
                    drawY += increment;
                    DebugText.Print(subChild.Name, new Int2(drawX + (increment * 2), drawY));
                }
            }
        }
    }
}