using OpenTK.GLControl;
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using OpenTK.Graphics.OpenGL;
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using OpenTK.Mathematics;
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namespace Yw.WinFrmUI.Hydro
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{
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/// <summary>
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/// 正交相机
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/// </summary>
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internal class Ortho2dCamera
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{
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// 基础参数
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private List<Vector3> _pts = null; //所有坐标
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private BoundingBox3 _wbx;//世界包围盒
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private BoundingBox3 _vbx;//视图包围盒
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private float _baseSize = 10f;//基础尺寸
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private float _orthoWidth = 10f;//正交宽度
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private float _orthoHeight = 10f;//正交高度
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private float _orthoNear = 0.1f;//正交近截面
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private float _orthoFar = 10f;//正交远截面
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private float _aspect = 1f;//视口宽高比
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private Vector3 _rotation = Vector3.Zero;//旋转量
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private Vector3 _translation = Vector3.Zero;//平移量
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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 => _projectionMatrix;
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private Matrix4 _projectionMatrix;
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/// <summary>
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/// 视图模型
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/// </summary>
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public Matrix4 ViewMatrix
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{
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get
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{
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return _viewMatrix;
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}
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}
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private Matrix4 _viewMatrix;
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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 => _modelMatrix;
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private Matrix4 _modelMatrix;
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public Vector3 Translation => _translation;
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public Vector3 Rotation => _rotation;
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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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/// <summary>
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/// 初始化
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/// </summary>
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public void Initial(List<Vector3> pts)
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{
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_pts = pts;
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if (pts != null && pts.Count > 0)
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{
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_wbx = new BoundingBox3(pts);
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_vbx = TransformBoundsToViewSpace(_wbx);
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_baseSize = CalcuBaseSize(_vbx);
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}
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}
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//世界包围盒=>视图包围盒
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private BoundingBox3 TransformBoundsToViewSpace(BoundingBox3 worldBounds)
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{
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var corners = worldBounds.GetCorners();
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Vector3 min = new(float.MaxValue);
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Vector3 max = new(float.MinValue);
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var qua = new Quaternion(_rotation);
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foreach (var corner in corners)
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{
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Vector3 viewPos = Vector3.Transform(corner, qua);
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min = Vector3.ComponentMin(min, viewPos);
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max = Vector3.ComponentMax(max, viewPos);
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}
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return new BoundingBox3(min, max);
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}
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//计算基础尺寸
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private float CalcuBaseSize(BoundingBox3 vbx)
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{
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var halfX = Math.Max(Math.Abs(vbx.Max.X), Math.Abs(vbx.Min.X));
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var halfY = Math.Max(Math.Abs(vbx.Max.Y), Math.Abs(vbx.Min.Y));
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var halfZ = Math.Max(Math.Abs(vbx.Max.Z), Math.Abs(vbx.Min.Z));
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var baseSize = Math.Max(halfX, Math.Max(halfY, halfZ));
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return baseSize * 2f;
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}
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//更新视口
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public void UpdateViewport(int width, int height)
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{
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var w = width < 1 ? 1 : width;
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var h = height < 1 ? 1 : height;
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_aspect = w / (float)h;
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GL.Viewport(0, 0, w, h);
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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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var center = (_vbx.Min + _vbx.Max) * 0.5f;
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_modelMatrix = Matrix4.CreateTranslation(-center);
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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 center = (_vbx.Min + _vbx.Max) * 0.5f;
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var eye = center + new Vector3(0, 0, _baseSize + 0.1f);
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// 视图矩阵：将场景中心对齐到视口中心
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_viewMatrix = Matrix4.LookAt(
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eye, // 摄像机位置
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Vector3.Zero,// 观察目标
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Vector3.UnitY); // 上方向
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}
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//更新投影矩阵
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public void UpdateProjectionMatrix()
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{
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float width = _baseSize;
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float height = _baseSize;
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if (_aspect > 1)
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{
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width = _baseSize * _aspect;
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}
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else
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{
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height = _baseSize / _aspect;
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}
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width *= this.Zoom;
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height *= this.Zoom;
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// 设置正交投影矩阵
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_projectionMatrix = Matrix4.CreateOrthographic(
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width,
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height,
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0.1f, // zNear
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_baseSize + 0.1f // zFar (包含模型高度)
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);
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}
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#region 鼠标交互
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private Vector2 _lastMousePos;//最后一次鼠标位置
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private bool _isDragging = false;//是否增在拖动
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private bool _isRotating = false;//是否正在旋转
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/// <summary>
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/// 处理鼠标滚轮
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/// </summary>
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public void HandleMouseWheel(GLControl gl, MouseEventArgs e)
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{
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this.Zoom *= e.Delta > 0 ? 0.9f : 1.1f;
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UpdateProjectionMatrix();
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gl.Invalidate();
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}
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/// <summary>
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/// 处理鼠标按下
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/// </summary>
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public void HandleMouseDown(GLControl gl, MouseEventArgs e)
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{
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if (e.Button == MouseButtons.Right)
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{
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_isDragging = true;
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_lastMousePos = new Vector2(e.X, e.Y);
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gl.Cursor = Cursors.SizeAll; // 修改光标样式
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}
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else if (e.Button == MouseButtons.Left)
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{
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_isRotating = true;
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_lastMousePos = new Vector2(e.X, e.Y);
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gl.Cursor = Cursors.SizeAll; // 修改光标样式
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}
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}
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/// <summary>
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/// 处理鼠标弹起
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/// </summary>
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public void HandleMouseUp(GLControl gl, MouseEventArgs e)
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{
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if (e.Button == MouseButtons.Right)
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{
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_isDragging = false;
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gl.Cursor = Cursors.Default;
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}
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else if (e.Button == MouseButtons.Left)
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{
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_isRotating = false;
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gl.Cursor = Cursors.Default;
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}
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}
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/// <summary>
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/// 处理鼠标移动
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/// </summary>
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public void HandleMouseMove(GLControl gl, MouseEventArgs e)
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{
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if (_isDragging)
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{
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Vector2 currentPos = new Vector2(e.X, e.Y);
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Vector2 delta = currentPos - _lastMousePos;
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_lastMousePos = currentPos;
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// 计算平移量（Y轴方向需要反转）
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_translation.X += delta.X / this.Zoom;
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_translation.Y -= delta.Y / this.Zoom;
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gl.Invalidate();
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}
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else if (_isRotating)
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{
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Vector2 currentPos = new Vector2(e.X, e.Y);
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Vector2 delta = currentPos - _lastMousePos;
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_lastMousePos = currentPos;
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_rotation.X -= delta.Y;
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_rotation.Y += delta.X;
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_vbx = TransformBoundsToViewSpace(_wbx);
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_baseSize = CalcuBaseSize(_vbx);
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// UpdateModelMatrix();
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//UpdateViewMatrix();
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//UpdateProjectionMatrix();
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gl.Invalidate();
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}
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}
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#endregion
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}
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}
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