103 lines
3.2 KiB
C#
103 lines
3.2 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> OnViewMatrixChanged { get; } = new();
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public Event<MonoGameCamera2D> OnProjectionMatrixChanged { 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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public GraphicsDeviceManager Graphics { get; private set; } = null!;
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public ITransform2D Transform { get; private set; } = null!;
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public Matrix4x4 ProjectionMatrix
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{
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get;
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private set
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{
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if (field == value)
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return;
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field = value;
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OnProjectionMatrixChanged.Invoke(this);
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}
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} = Matrix4x4.Identity;
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public Matrix4x4 ViewMatrix
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{
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get;
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private set
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{
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if (field == value)
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return;
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field = value;
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OnViewMatrixChanged.Invoke(this);
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}
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} = Matrix4x4.Identity;
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public Viewport Viewport
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{
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get;
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set
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{
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if (field.Equals(value))
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return;
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field = value;
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OnViewportChanged.Invoke(this);
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}
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} = default;
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public float Zoom
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{
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get;
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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 (field == newValue)
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return;
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field = newValue;
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OnZoomChanged.Invoke(this);
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}
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} = 1f;
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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(), ViewMatrix.Inverse.ToXnaMatrix()).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(), ViewMatrix.ToXnaMatrix()).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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ProjectionMatrix = Matrix.CreateOrthographicOffCenter(Viewport.X, Viewport.Width, Viewport.Height, Viewport.Y, 0, 1).FromXnaMatrix();
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ViewMatrix =
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Matrix4x4.CreateTranslation(new Vector3D(-Transform.Position.X, Transform.Position.Y, 0f)) *
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Matrix4x4.CreateRotationZ(Transform.Rotation * Math.DegreeToRadian) *
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Matrix4x4.CreateScale(Transform.Scale.X.Max(Transform.Scale.Y)) *
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Matrix4x4.CreateScale(Zoom) *
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Matrix4x4.CreateTranslation(new Vector3D(Viewport.Width * .5f, Viewport.Height * .5f, 0f));
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}
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}
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