Aseprite importer for monogame, very crude prototype.

Sprite.cs

using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using System;
using System.Linq;
using Newtonsoft.Json.Linq;

class Sprite
{
	public Vector2 position;
	public Texture2D texture;
	public JObject json;
	public Frame[] frames;
	public Point size;
	public Animation[] animations;
	public Animation currentAnimation;
	public double ms = 0;
	public int currentFrame;


	public Sprite(Vector2 position, Texture2D texture, string pathToJson)
	{
		this.position = position;
		this.texture = texture;
		this.json = JObject.Parse(System.IO.File.ReadAllText(pathToJson));
		string s = "";
		int i = 0;
		frames = new Frame[json["frames"].Children().Count()];
		foreach (JProperty child in json["frames"])
		{
			s = child.Name;
			size.X = int.Parse((string)json["frames"][s]["sourceSize"]["w"]);
			size.Y = int.Parse((string)json["frames"][s]["sourceSize"]["h"]);
			
			frames[i] = new Frame(
				int.Parse((string)json["frames"][s]["frame"]["x"]),
				int.Parse((string)json["frames"][s]["frame"]["y"]),
				int.Parse((string)json["frames"][s]["duration"])
				);
			i++;
		}
		JArray anims = (JArray)json["meta"]["frameTags"];
		animations = new Animation[anims.Count];
		for (int j = 0; j < anims.Count; j++)
		{
			Animation an = new Animation((string)anims[j]["name"], (int)anims[j]["from"], (int)anims[j]["to"]);
			animations[j] = an;
		}
	}

	public virtual void Update(GameTime gameTime)
	{
		ms += gameTime.ElapsedGameTime.TotalMilliseconds;
		Console.WriteLine(ms);
		if (ms >= frames[currentFrame].ms)
		{
			Console.WriteLine(true);
			ms = 0;
			currentFrame++;
			if (currentFrame > currentAnimation.to)
				currentFrame = currentAnimation.from;
		}
		else
		{
			Console.WriteLine(false);
		}
	}

	public virtual bool SetAnimation(string name)
	{
		foreach (Animation animation in animations)
		{
			if (animation.name == name)
			{
				currentAnimation = animation;
				ms = 0;
				return true;
			}
		}
		return false;
	}

	public virtual void Draw(SpriteBatch spriteBatch)
	{
		spriteBatch.Draw(texture, position, new Rectangle(frames[currentFrame].point, size), Color.White);
	}

	//public static bool Overlap(Sprite a, Sprite b, int scale = 2)
	//{
	//	Rectangle ar = new Rectangle((a.position * scale).ToPoint(), new Point(a.current.Size.X * scale, a.current.Size.Y * scale));
	//	Rectangle ab = new Rectangle((b.position * scale).ToPoint(), new Point(b.current.Size.X * scale, b.current.Size.Y * scale));
	//	return ar.Intersects(ab);
	//}
}

struct Animation
{
	public string name;
	public int from;
	public int to;
	public Animation(string name, int from, int to)
	{
		this.name = name;
		this.from = from;
		this.to = to;
	}
}

struct Frame
{
	public Point point;
	public int ms;
	public Frame(int x, int y, int ms)
	{
		this.point = new Point(x, y);
		this.ms = ms;
	}
	public Frame(Point point, int ms)
	{
		this.point = point;
		this.ms = ms;
	}
}