Puppet2D.Engine/Common/Camera.cs - master - EugenyCh7/Puppet2D.Net

Puppet2D.Engine/Common/Camera.cs
134 строки4 KB
EugenyCh7
- Puppet2D.Common.csproj
24 авг 2025, 13:32
24 авг 2025, 13:32bcb1204
using Puppet2D.Engine.Components;
using Puppet2D.Engine.GameWindows;
using Puppet2D.Graphics;
using Puppet2D.System;
using System;

namespace Puppet2D.Engine.Common
{
    public class Camera : IDrawable
    {
        private Vector2 previousPosition;
        private readonly RectangleShape back = new RectangleShape(new Vector2(1.0f, 1.0f));
        private readonly View backView = new View(new Vector2(0.5f, 0.5f), new Vector2(1.0f, 1.0f));
        internal readonly View view = new View();

        public Camera()
        {
            Background = Color.Transparent;
            Viewport = new FloatRect(0, 0, 1, 1);
        }

        /// <summary>
        /// Is the camera active?
        /// </summary>
        public bool IsActive { get; set; } = true;

        /// <summary>
        /// The background of the camera.
        /// </summary>
        public Color Background
        {
            get => back.FillColor;
            set => back.FillColor = value;
        }

        /// <summary>
        /// The degree of response of the camera to the movement of the target.
        /// </summary>
        public float Response
        {
            get;
            set
            {
                if (value < 0.0f || value > 1.0f)
                    throw new ArgumentOutOfRangeException();
                field = value;
            }
        } = 1.0f;

        /// <summary>
        /// If the target is not specified, it sets the center point of the camera.
        /// If the target is specified, it sets the center point of the camera relative to the target.
        /// </summary>
        public Vector2 Center { get; set; }

        /// <summary>
        /// The size of the camera area in meters.
        /// </summary>
        public Vector2 Size { get; set; }

        /// <summary>
        /// Screen zoom level (1.0 by default).
        /// </summary>
        public float Zoom
        {
            get;
            set
            {
                if (value <= 0.0f)
                    throw new ArgumentOutOfRangeException();
                field = value;
            }
        } = 1.0f;

        /// <summary>
        /// The camera's target.
        /// </summary>
        public Transformation Target { get; set; }

        /// <summary>
        /// Target viewport of the camera, defined as a factor of the size of the target to which the view is applied.
        /// </summary>
        public FloatRect Viewport
        {
            get => view.Viewport;
            set
            {
                view.Viewport = value;
                backView.Viewport = value;
            }
        }

        /// <summary>
        /// The current coordinates where the camera is looking at.
        /// </summary>
        public Vector2 ViewCenter => view.Center;

        /// <summary>
        /// Set the position instantly.
        /// </summary>
        public void MoveTo(Vector2 worldPoint)
        {
            previousPosition = worldPoint;
        }

        internal void UpdateSize(GameWindow window)
        {
            Vector2 newViewSize = new Vector2(
                Size.X * window.WindowSize.X / (window.InitialWindowSize.X * Zoom),
                Size.Y * window.WindowSize.Y / (window.InitialWindowSize.Y * Zoom));
            view.Size = newViewSize;
        }

        internal void UpdateCenter()
        {
            if (Target == null)
            {
                previousPosition = Center;
                view.Center = previousPosition;
            }
            else
            {
                previousPosition = Target.Position * Response + (1.0f - Response) * previousPosition;
                view.Center = previousPosition + Center;
            }
        }

        public void Draw(IRenderTarget target, RenderStates states)
        {
            target.SetView(backView);
            target.Draw(back, states);
        }
    }
}