93 lines
3.0 KiB
C#
Executable File
93 lines
3.0 KiB
C#
Executable File
using Microsoft.Xna.Framework;
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using Microsoft.Xna.Framework.Graphics;
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namespace RecrownedAthenaeum.Render
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{
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/// <summary>
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/// A generic camera. Functions in 3D.
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/// </summary>
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public class BasicCamera
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{
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/// <summary>
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/// The scale for the world.
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/// </summary>
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public float worldScale = 1f;
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/// <summary>
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/// Current position in the world.
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/// </summary>
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public Vector3 position;
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/// <summary>
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/// The place the 3D camera is looking at.
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/// </summary>
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public Vector3 lookAt;
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/// <summary>
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/// The direction up is for the camera.
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/// </summary>
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public Vector3 upDirection;
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/// <summary>
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/// The transform matrix representing the world (rotation and translations of the original world).
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/// </summary>
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public Matrix worldMatrix;
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/// <summary>
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/// The view matrix that describes where the camera looks.
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/// </summary>
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public Matrix ViewMatrix { get; protected set; }
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/// <summary>
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/// The projection matrix.
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/// </summary>
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public Matrix projectionMatrix;
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/// <summary>
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/// 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.
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/// </summary>
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public BasicEffect basicEffect;
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/// <summary>
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/// Constructs 3D camera with an orthographic projection matrix with dimensions of graphics devices viewport. All changes to matrices should have apply called after changes.
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/// </summary>
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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 BasicCamera(BasicEffect basicEffect = null)
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{
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worldMatrix = Matrix.Identity;
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lookAt = Vector3.Forward;
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upDirection = Vector3.Up;
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projectionMatrix = Matrix.Identity;
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this.basicEffect = basicEffect;
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Apply();
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}
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/// <summary>
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/// Applies the changes to the fields and properties of the camera.
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/// </summary>
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public virtual void Apply()
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{
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ViewMatrix = Matrix.CreateLookAt(position, lookAt, upDirection);
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worldMatrix *= Matrix.CreateScale(worldScale);
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if (basicEffect != null)
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{
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basicEffect.World = worldMatrix;
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basicEffect.Projection = projectionMatrix;
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basicEffect.View = ViewMatrix;
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}
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}
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/// <summary>
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/// Moves camera by the given amount.
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/// </summary>
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/// <param name="move">A <see cref="Vector3"/> that contains how much in each direction to move.</param>
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public void MoveCamera(Vector3 move)
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{
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position += move;
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Apply();
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}
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}
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}
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