using OpenTK.Mathematics;
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namespace Yw.WinFrmUI.Hydro
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{
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/// <summary>
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/// 2d正交相机
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/// </summary>
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internal class OrthoCamera2d
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{
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/// <summary>
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/// 辅助类
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/// </summary>
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public OrthoCamera2d() { }
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/// <summary>
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/// 旋转
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/// </summary>
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public Vector3 Rotation
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{
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get => _rotation;
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set => _rotation = value;
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}
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private Vector3 _rotation = Vector3.Zero;
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/// <summary>
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/// 平移
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/// </summary>
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public Vector3 Translation
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{
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get => _translation;
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set => _translation = value;
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}
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private Vector3 _translation = Vector3.Zero;
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/// <summary>
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/// 投影矩阵
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/// </summary>
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public Matrix4 ProjectionMatrix
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{
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get => _projectionMatrix;
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set => _projectionMatrix = value;
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}
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private Matrix4 _projectionMatrix = Matrix4.Identity;
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/// <summary>
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/// 视图矩阵
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/// </summary>
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public Matrix4 ViewMatrix
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{
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get => _viewMatrix;
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set => _viewMatrix = value;
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}
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private Matrix4 _viewMatrix = Matrix4.Identity;
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/// <summary>
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/// 模型矩阵
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/// </summary>
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public Matrix4 ModelMatrix
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{
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get => _modelMatrix;
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set => _modelMatrix = value;
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}
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private Matrix4 _modelMatrix = Matrix4.Identity;
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/// <summary>
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/// 缩放
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/// </summary>
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public float Zoom
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{
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get => _zoom;
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set => _zoom = MathHelper.Clamp(value, 0.01f, 100.0f); // 限制缩放范围
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}
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private float _zoom = 1.0f; // 当前缩放系数（1表示原始大小）
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private BoundingBox3 _bx = null;
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private Vector3 _center = Vector3.Zero;
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private float _radius = 100f;//包围球半径
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private float _width, _height, _aspect;//视口宽度和高度与宽高比
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private float _pw, _ph;//投影宽度和高度
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/// <summary>
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/// 初始化
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/// </summary>
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public void Initial(List<Vector3> vers, int width, int height)
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{
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UpdateViewPort(width, height);
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if (vers == null || vers.Count < 1)
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{
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vers = new List<Vector3>()
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{
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new Vector3(-_width/2f,-_height/2f,-100f),
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new Vector3(width/2f,height/2f,100f)
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};
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}
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_bx = new BoundingBox3(vers);
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_center = _bx.Center;
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_radius = _bx.Size.Length / 2f * 1.2f;
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UpdateMatrices();
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}
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/// <summary>
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/// 更新视口
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/// </summary>
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public void UpdateViewPort(int width, int height)
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{
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_width = width < 1 ? 1f : width;
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_height = height < 1 ? 1f : height;
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_aspect = _width / _height;
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}
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/// <summary>
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/// 更新缩放
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/// </summary>
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public void UpdateZoom(float scale)
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{
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this.Zoom *= scale;
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}
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/// <summary>
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/// 更新平移
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/// </summary>
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public void UpdateTranslation(float dx, float dy)
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{
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float xratio = _pw / _width;
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float yratio = _ph / _height;
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_translation.X += dx * xratio;
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_translation.Y -= dy * yratio;
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}
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/// <summary>
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/// 更新旋转
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/// </summary>
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public void UpdateRotation(float dx, float dy)
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{
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_rotation.X += dy / _radius;
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_rotation.Y += dx / _radius;
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_rotation.X = NormalizeAngle(_rotation.X);
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_rotation.Y = NormalizeAngle(_rotation.Y);
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}
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/// <summary>
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/// 更新模型矩阵
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/// </summary>
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public void UpdateModelMatrix()
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{
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_modelMatrix = Matrix4.CreateRotationX(_rotation.X) *
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Matrix4.CreateRotationY(_rotation.Y) *
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Matrix4.CreateTranslation(_translation * this.Zoom);
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}
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/// <summary>
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/// 更新视图矩阵
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/// </summary>
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public void UpdateViewMatrix()
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{
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var eye = new Vector3(_center.X, _center.Y, _center.Z + 2f * _radius);
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var target = _center;
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var up = Vector3.UnitY;
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_viewMatrix = Matrix4.LookAt(eye, target, up);
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}
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/// <summary>
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/// 更新投影矩阵
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/// </summary>
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public void UpdateProjectionMatrix()
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{
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_pw = _ph = _radius * 2f;
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if (_aspect > 1)
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{
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_pw *= _aspect;
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}
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else
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{
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_ph /= _aspect;
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}
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_projectionMatrix = Matrix4.CreateOrthographic(_pw * this.Zoom, _ph * this.Zoom, _radius, _radius * 3f);
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}
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/// <summary>
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/// 更新举证
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/// </summary>
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public void UpdateMatrices()
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{
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UpdateModelMatrix();
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UpdateViewMatrix();
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UpdateProjectionMatrix();
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}
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//标准化旋转弧度
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private static float NormalizeAngle(float angle)
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{
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// 取余操作
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angle %= 2 * MathF.PI;
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// 如果结果为负数，加上 2π 使其处于 [0, 2π) 区间
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if (angle < 0)
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{
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angle += 2 * MathF.PI;
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}
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return angle;
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}
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}
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}
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