recrownedgtk/RecrownedAthenaeum/Camera/Camera2D.cs

50 lines
1.6 KiB
C#

using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using System;
namespace RecrownedAthenaeum.Camera
{
/// <summary>
/// A virtual 2D camera that wraps the normal <see cref="Camera"/>. Default projection is orthographic.
/// </summary>
public class Camera2D : Camera
{
/// <summary>
/// The 2D position.
/// </summary>
public Vector2 Position { get { return new Vector2(position.X, position.Y); } set { position.X = value.X; position.Y = value.Y; } }
/// <summary>
/// A 2D camera from the generic <see cref="Camera"/>.
/// </summary>
public Camera2D() : base()
{
}
/// <summary>
/// Lerps to the given position.
/// </summary>
/// <param name="alpha">The multiplier for difference in distance.</param>
/// <param name="targetPosition">The target position to lerp to.</param>
/// <param name="delta">Time between this frame and the previous frame.</param>
public void LinearInterpolationToPosition(float alpha, Vector2 targetPosition, float delta)
{
if (alpha <= 0 && alpha > 1f) throw new ArgumentException("Alpha can't be greater than 1f, less than or equal to 0.");
Vector2 distance = targetPosition - Position;
distance *= (float)(1.0f - Math.Pow(1 - alpha, delta / 0.02f));
Position += distance;
Apply();
}
private Matrix BasicOrthographic()
{
return Matrix.CreateOrthographic(graphicsDevice.Viewport.Width, graphicsDevice.Viewport.Height, 0, 1);
}
}
}