85 lines
3.1 KiB
C#
85 lines
3.1 KiB
C#
using OpenTK;
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using System;
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namespace RecrownedAthenaeum.Graphics.Render
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{
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/// <summary>
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/// A virtual 2D camera that wraps the normal <see cref="BasicCamera"/>. Default projection is orthographic.
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/// </summary>
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public class Camera2D : BasicCamera
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{
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/// <summary>
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/// The width of the view of the camera.
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/// </summary>
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public int viewWidth;
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/// <summary>
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/// The height of the view of the camera.
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/// </summary>
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public int viewHeight;
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/// <summary>
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/// The 2D position.
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/// </summary>
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public Vector2 Position { get { return new Vector2(position.X, position.Y); } set { position.X = value.X; position.Y = value.Y; } }
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/// <summary>
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/// Places camera in the center given the corner position.
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/// </summary>
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public Vector2 ConrnerPosition { set { position.X = value.X + viewWidth / 2f; position.Y = value.Y + viewHeight / 2f; } }
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/// <summary>
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/// A 2D camera from the generic <see cref="BasicCamera"/>.
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/// </summary>
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/// <param name="height">Width of camera view.</param>
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/// <param name="width">Height of camera view.</param>
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/// <param name="basicEffect">A basic effect that will be updated with the correct matrice information everytime <see cref="Apply"/> is called. Can be null and thus will not be used.</param>
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public Camera2D(int width, int height, BasicEffect basicEffect = null) : base(basicEffect)
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{
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this.viewWidth = width;
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this.viewHeight = height;
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upDirection = Vector3.Down;
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ConrnerPosition = new Vector2(0, 0);
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Apply();
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}
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/// <summary>
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/// Applies for 2D.
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/// Sets where the camera is looking for the view matrix to the position of the camera.
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/// </summary>
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public override void Apply()
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{
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projectionMatrix = Matrix.CreateOrthographic(viewWidth, viewHeight, 0, 1);
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position.Z = 0;
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lookAt = new Vector3(Position, 1f);
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base.Apply();
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}
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/// <summary>
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/// Lerps to the given position.
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/// </summary>
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/// <param name="alpha">The multiplier for difference in distance.</param>
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/// <param name="targetPosition">The target position to lerp to.</param>
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/// <param name="delta">Time between this frame and the previous frame.</param>
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public void LinearInterpolationToPosition(float alpha, Vector2 targetPosition, float delta)
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{
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if (alpha <= 0 && alpha > 1f) throw new ArgumentException("Alpha can't be greater than 1f, less than or equal to 0.");
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Vector2 distance = targetPosition - Position;
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distance *= (float)(1.0f - Math.Pow(1 - alpha, delta / 0.02f));
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Position += distance;
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}
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/// <summary>
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/// Moves the camera.
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/// Apply needs to be called.
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/// </summary>
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/// <param name="move">Magnitude of how much to move per axis.</param>
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public void MoveCamera(Vector2 move)
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{
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Position += move;
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}
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}
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}
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