rhythmbullet/RhythmBullet/Zer01HD/Utilities/Camera/Camera2D.cs

43 lines
1.5 KiB
C#

using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace RhythmBullet.Zer01HD.Utilities.Camera
{
public class Camera2D
{
public float Zoom;
public Vector2 Position;
public Matrix TransformMatrix { get; private set; }
public GraphicsDevice graphicsDevice;
public Camera2D(GraphicsDevice graphicsDevice)
{
this.graphicsDevice = graphicsDevice;
Zoom = 1f;
Position.X = this.graphicsDevice.Viewport.Width * 0.5f;
Position.Y = this.graphicsDevice.Viewport.Height * 0.5f;
}
public void Update()
{
Rectangle bounds = graphicsDevice.Viewport.Bounds;
TransformMatrix =
Matrix.CreateTranslation(new Vector3(-Position.X, -Position.Y, 0)) *
Matrix.CreateScale(Zoom) *
Matrix.CreateTranslation(new Vector3(bounds.Width * 0.5f, bounds.Height * 0.5f, 0f));
}
public void LinearInterpolationToPosition(float alpha, Vector2 targetPosition)
{
if (alpha < 0 && alpha > 1f) throw new ArgumentException("Alpha can't be greater than 1f, or less than 0.");
Position.X = MathHelper.Lerp(Position.X, targetPosition.X, alpha);
Position.Y = MathHelper.Lerp(Position.Y, targetPosition.Y, alpha);
}
}
}