using OpenTK.GLControl;
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using OpenTK.Graphics.OpenGL;
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using OpenTK.Mathematics;
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using System.Transactions;
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using System.Windows.Forms;
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namespace Yw.WinFrmUI.Hydro
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{
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/// <summary>
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/// 正交相机辅助类
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/// </summary>
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internal class OrthoCamera2dHelper
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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 OrthoCamera2dHelper() { }
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/// <summary>
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/// 初始化
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/// </summary>
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public void Initial(GLControl gl, NetworkL3d nw)
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{
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_gl = gl;
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_nw = nw;
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_veccache = new Vector32dCacheHelper(nw);
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var pts = _veccache.GetPositions();
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_bx = new BoundingBox3(pts);
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_bxcache = new BoundingBox32dCacheHelper(nw, _veccache);
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_mc = (_bx.Max + _bx.Min) * 0.5f;
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_radius = (_bx.Max - _bx.Min).Length / 2f;
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UpdateModelMatrix();
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UpdateViewMatrix();
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UpdateProjectionMatrix();
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}
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// 基础参数
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private GLControl _gl = null;//gl控件
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private NetworkL3d _nw = null;//管网模型
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private Vector32dCacheHelper _veccache = null;//位置辅助类
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private BoundingBox3 _bx = null;//包围盒
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private BoundingBox32dCacheHelper _bxcache = null;//包围盒缓存
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private Vector3 _mc; //模型中心
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private float _radius = 100f;//包围球半径
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private float _pw = 10f;//投影宽度
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private float _ph = 10f;//投影高度
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private Quaternion _rotation = Quaternion.Identity;//旋转四元数
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private Vector3 _translation = Vector3.Zero;//平移量
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private Matrix4 _modelMatrix;//模型矩阵
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private Matrix4 _viewMatrix;//视图矩阵
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private Matrix4 _projMatrix;//投影矩阵
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private Vector3 _forward;
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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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/// 是否初始化
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/// </summary>
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public bool Initialized
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{
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get
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{
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if (_nw == null)
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{
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return false;
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}
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if (_gl == null)
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{
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return false;
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}
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return true;
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}
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}
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//更新模型矩阵
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private void UpdateModelMatrix()
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{
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_modelMatrix = Matrix4.CreateTranslation(_translation * this.Zoom);
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}
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//更新视图矩阵
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private void UpdateViewMatrix()
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{
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var eye = new Vector3(_mc.X, _mc.Y, _mc.Z + _radius * 2);
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var target = _mc;
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var up = Vector3.UnitY;
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var matrix = Matrix4.CreateFromQuaternion(_rotation);
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matrix.Invert();
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eye = Vector3.TransformPosition(eye, matrix);
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up = Vector3.TransformPosition(up, matrix);
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_viewMatrix = Matrix4.LookAt(eye, target, up);
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_forward = target - eye;
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_forward.Normalize();
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}
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//更新投影矩阵
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private void UpdateProjectionMatrix()
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{
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if (!Initialized)
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{
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return;
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}
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var aspect = _gl.AspectRatio;
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var size = _radius * 2;
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_pw = size;
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_ph = size;
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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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_projMatrix = Matrix4.CreateOrthographic(_pw * this.Zoom, _ph * this.Zoom, _radius, _radius * 3);
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}
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#region 鼠标交互
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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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private Point _lastMousePos;//最近一次鼠标位置
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/// <summary>
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/// 处理大小改变
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/// </summary>
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public void HandleResize()
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{
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if (!Initialized)
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{
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return;
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}
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_gl.MakeCurrent();
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GL.Viewport(0, 0, _gl.Width, _gl.Height);
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UpdateProjectionMatrix();
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_gl.Invalidate();
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}
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/// <summary>
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/// 处理绘制
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/// </summary>
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public void HandleRender()
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{
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if (!Initialized)
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{
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return;
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}
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_gl.MakeCurrent();
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GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit | ClearBufferMask.StencilBufferBit);
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//投影矩阵
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GL.MatrixMode(MatrixMode.Projection);
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GL.LoadMatrix(ref _projMatrix);
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//视图矩阵
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GL.MatrixMode(MatrixMode.Modelview);
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var viewMatrix = _viewMatrix * _modelMatrix;
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GL.LoadMatrix(ref viewMatrix);
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_nw.Draw2d();
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//var code = GL.GetError();
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_gl.SwapBuffers();
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}
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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(MouseEventArgs e)
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{
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if (!Initialized)
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{
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return;
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}
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this.Zoom *= e.Delta > 0 ? 0.9f : 1.1f;
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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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/// <summary>
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/// 处理鼠标按下
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/// </summary>
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public void HandleMouseDown(MouseEventArgs e)
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{
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if (!Initialized)
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{
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return;
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}
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_lastMousePos = e.Location;
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if (e.Button == MouseButtons.Right)
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{
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_isDragging = true;
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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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_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(MouseEventArgs e)
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{
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if (!Initialized)
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{
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return;
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}
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_lastMousePos = e.Location;
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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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_gl.Invalidate();
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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(MouseEventArgs e)
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{
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if (!Initialized)
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{
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return;
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}
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float dx = e.X - _lastMousePos.X;
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float dy = e.Y - _lastMousePos.Y;
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if (_isRotating)
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{
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// 根据鼠标移动量计算旋转角度
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Quaternion rotationX = Quaternion.FromAxisAngle(Vector3.UnitX, dy / _radius);
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Quaternion rotationY = Quaternion.FromAxisAngle(Vector3.UnitY, dx / _radius);
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// 更新四元数
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_rotation = rotationY * rotationX * _rotation;
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_rotation = Quaternion.Normalize(_rotation);
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UpdateViewMatrix();
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}
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else if (_isDragging)
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{
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float xratio = _pw / _gl.Width;
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float yratio = _ph / _gl.Height;
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_translation.X += dx * xratio;
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_translation.Y -= dy * yratio;
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UpdateModelMatrix();
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}
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else
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{
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var depth = OrthoTransformHelper.GetScreenPointDepth(e.X, e.Y, _gl.Height);
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var ray = OrthoTransformHelper.CreateRay(e.X, e.Y, depth, _forward, _modelMatrix, _viewMatrix, _projMatrix, _gl.Width, _gl.Height);
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if (ray != null)
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{
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_nw.Hover2d(ray, _bxcache);
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}
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}
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_lastMousePos = e.Location;
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_gl.Invalidate();
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}
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/// <summary>
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/// 处理鼠标点击
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/// </summary>
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public void HandleMouseClick(MouseEventArgs e)
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{
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}
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/// <summary>
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/// 处理鼠标双击
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/// </summary>
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public void HandleMouseDoubleClick(MouseEventArgs e)
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{
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var depth = OrthoTransformHelper.GetScreenPointDepth(e.X, e.Y, _gl.Height);
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var world = OrthoTransformHelper.ScreenToWorld(e.X, e.Y, depth, _viewMatrix * _modelMatrix, _projMatrix, _gl.Width, _gl.Height);
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MessageBox.Show($"x:{world.X},y:{world.Y},z:{world.Z}");
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}
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#endregion
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}
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}
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