105 lines
3.1 KiB
C#
105 lines
3.1 KiB
C#
using Microsoft.Xna.Framework;
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using Microsoft.Xna.Framework.Graphics;
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using Engine.Core;
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namespace Engine.Integration.MonoGame;
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public class MonoGameCamera2D : Behaviour, ICamera2D, IFirstFrameUpdate, ILastFrameUpdate, IPreDraw
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{
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public Event<MonoGameCamera2D> OnMatrixTransformChanged { get; } = new();
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public Event<MonoGameCamera2D> OnViewportChanged { get; } = new();
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public Event<MonoGameCamera2D> OnZoomChanged { get; } = new();
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private Matrix _matrixTransform = Matrix.Identity;
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private Viewport _viewport = default;
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private float _zoom = 1f;
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public GraphicsDeviceManager Graphics { get; private set; } = null!;
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public ITransform2D Transform { get; private set; } = null!;
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public Matrix MatrixTransform
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{
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get => _matrixTransform;
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set
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{
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if (_matrixTransform == value)
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return;
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_matrixTransform = value;
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OnMatrixTransformChanged.Invoke(this);
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}
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}
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public Vector2D Position
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{
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get => Transform.Position;
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set => Transform.Position = value;
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}
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public Viewport Viewport
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{
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get => _viewport;
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set
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{
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if (_viewport.Equals(value))
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return;
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_viewport = value;
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OnViewportChanged.Invoke(this);
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}
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}
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public float Zoom
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{
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get => _zoom;
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set
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{
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float newValue = Math.Max(0.1f, value);
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if (_zoom == newValue)
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return;
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_zoom = newValue;
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OnZoomChanged.Invoke(this);
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}
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}
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public float Rotation
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{
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get => Transform.Rotation;
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set => Transform.Rotation = value;
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}
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// TODO This causes delay since OnPreDraw calls assuming this is called in in Update
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public Vector2D ScreenToWorldPosition(Vector2D screenPosition)
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{
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Vector2D worldPosition = Vector2.Transform(screenPosition.ToVector2(), Matrix.Invert(MatrixTransform)).ToVector2D();
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return worldPosition.Scale(EngineConverterExtensions.screenScale);
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}
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public Vector2D WorldToScreenPosition(Vector2D worldPosition)
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{
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Vector2D screenPosition = Vector2.Transform(worldPosition.ToVector2(), MatrixTransform).ToVector2D();
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return screenPosition.Scale(EngineConverterExtensions.screenScale);
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}
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public void LastActiveFrame() => Transform = null!;
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public void FirstActiveFrame()
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{
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Graphics = BehaviourController.UniverseObject.Universe.FindRequiredBehaviour<MonoGameWindowContainer>().Window.Graphics;
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Viewport = Graphics.GraphicsDevice.Viewport;
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Transform = BehaviourController.GetRequiredBehaviour<ITransform2D>();
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}
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public void PreDraw()
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{
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MatrixTransform =
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Matrix.CreateTranslation(new Vector3(-Position.X, Position.Y, 0f)) *
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Matrix.CreateRotationZ(Rotation * Math.DegreeToRadian) *
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Matrix.CreateScale(Transform.Scale.X.Max(Transform.Scale.Y)) *
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Matrix.CreateScale(Zoom) *
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Matrix.CreateTranslation(new Vector3(_viewport.Width * .5f, _viewport.Height * .5f, 0f));
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}
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}
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