---
title: "Renderer"
date: 2019-05-22T14:16:06-07:00
weight: 30
---

A Renderer is responsible for reading the game state and telling the game engine what to draw to the screen.

{{% notice note %}}
Remember: Encompass isn't a game engine and it doesn't have a rendering system. So Renderers aren't actually doing the rendering, it is just a way of structuring how we tell the game engine what to render.
{{% /notice %}}

If you were using FNA, a Renderer might look like this:

```cs
using System;
using Encompass;
using Microsoft.Xna.Framework;
using MyGame.Components;
using MyGame.Messages;

namespace MyGame.Renderers
{
    public class GridRenderer : Renderer
    {
        private int gridSize;
        private PrimitiveDrawer primitiveDrawer;

        public Renderer(PrimitiveDrawer primitiveDrawer)
        {
            this.primitiveDrawer = primitiveDrawer;
            this.gridSize = 16;
        }

        public override void Render(double dt, double alpha)
        {
            if (SomeComponent<EditorModeComponent>() && SomeComponent<MouseComponent>())
            {
                var entity = ReadEntity<MouseComponent>();
                var transformComponent = GetComponent<TransformComponent>(entity);

                Rectangle rectangle = new Rectangle
                {
                    X = (transformComponent.Position.X / gridSize) * gridSize,
                    Y = (transformComponent.Position.Y / gridSize) * gridSize,
                    Width = gridSize,
                    Height = gridSize
                };

                primitiveDrawer.DrawBorder(rectangle, 0, new System.Numerics.Vector2(1, 1), Color.White, 1);
            }
        }
    }
}
```

This Renderer will draw a rectangle at the position of the mouse on the screen if an `EditorModeComponent` exists in the world.

It's your job to figure out how to interpret your game's data into rendering. Many games will only have one big Renderer that just renders everything.