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2d视图辅助类
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/// </summary>
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internal class OrthoViewer2dHelper
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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 OrthoViewer2dHelper() { }
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#region 公共事件
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/// <summary>
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/// 旋转改变事件
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/// </summary>
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public event Action<Vector3> RotationChangedEvent;
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#endregion
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#region 私有字段
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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 Vector3CacheHelper _veccache = null;//位置缓存
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private OrthoCamera2d _camera = null;//相机
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private Point _lastMos;//最近的鼠标位置
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private bool _isTranslation, _isRotation;
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#endregion
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#region 公共属性
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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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if (_camera == 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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#endregion
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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 Vector3CacheHelper(nw);
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_camera = new OrthoCamera2d();
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_camera.Initial(_veccache.GetAll(), gl.Width, gl.Height);
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}
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#region 辅助方法
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//初始化GL状态
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private void InitialGLState()
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{
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GL.ClearColor(Color.Transparent); // 背景颜色
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GL.Enable(EnableCap.DepthTest);//深度测试
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GL.DepthMask(true); // 允许写入深度缓冲区
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GL.Enable(EnableCap.PointSmooth);//启用点平滑
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GL.Enable(EnableCap.LineSmooth);//启用线平滑
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GL.Enable(EnableCap.Multisample);// 启用反锯齿
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GL.ShadeModel(ShadingModel.Smooth);
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// 设置混合模式以支持反锯齿
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GL.Enable(EnableCap.Blend);
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GL.BlendFunc(BlendingFactor.SrcAlpha, BlendingFactor.OneMinusSrcAlpha);
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Resize();
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}
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#endregion
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#region 交互处理
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/// <summary>
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/// 加载
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/// </summary>
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public void Load()
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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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InitialGLState();
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}
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/// <summary>
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/// 大小改变
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/// </summary>
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public void Resize()
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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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_camera.UpdateViewPort(_gl.Width, _gl.Height);
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GL.Viewport(0, 0, _gl.Width, _gl.Height);
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_camera.UpdateMatrices();
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_gl.Invalidate();
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}
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/// <summary>
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/// 绘制
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/// </summary>
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public void Render()
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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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var projectionMatrix = _camera.ProjectionMatrix;
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GL.LoadMatrix(ref projectionMatrix);
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//视图矩阵
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GL.MatrixMode(MatrixMode.Modelview);
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var viewMatrix = _camera.ViewMatrix;
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GL.LoadMatrix(ref viewMatrix);
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var modelMatrix = _camera.ModelMatrix;
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GL.MultMatrix(ref modelMatrix);
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_nw.Draw2d(_camera.Zoom);
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_gl.SwapBuffers();
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}
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/// <summary>
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/// 鼠标滚轮
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/// </summary>
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public void MouseWheel(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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var scale = e.Delta > 0 ? 0.9f : 1.1f;
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_camera.UpdateZoom(scale);
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_camera.UpdateMatrices();
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_gl.Invalidate();
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}
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/// <summary>
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/// 鼠标按下
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/// </summary>
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public void MouseDown(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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_lastMos = e.Location;
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if (e.Button == MouseButtons.Right)
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{
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_isTranslation = 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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_isRotation = 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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/// 鼠标弹起
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/// </summary>
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public void MouseUp(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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_lastMos = e.Location;
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if (e.Button == MouseButtons.Right)
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{
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_isTranslation = 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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_isRotation = 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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/// 鼠标移动
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/// </summary>
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public void MouseMove(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 - _lastMos.X;
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float dy = e.Y - _lastMos.Y;
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if (_isRotation)
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{
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_camera.UpdateRotation(dx, dy);
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_camera.UpdateMatrices();
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this.RotationChangedEvent?.Invoke(_camera.Rotation);
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}
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else if (_isTranslation)
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{
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_camera.UpdateTranslation(dx, dy);
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_camera.UpdateMatrices();
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}
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var ray = OrthoTransformHelper.CreateRay(e.X, e.Y, _camera.ModelMatrix, _camera.ViewMatrix, _camera.ProjectionMatrix, _gl.Width, _gl.Height);
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if (ray != null)
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{
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_nw.Hover2d(ray, _camera.Zoom, _veccache);
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}
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_lastMos = e.Location;
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_gl.Invalidate();
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}
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/// <summary>
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/// 鼠标点击
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/// </summary>
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public void MouseClick(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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var ray = OrthoTransformHelper.CreateRay(e.X, e.Y, _camera.ModelMatrix, _camera.ViewMatrix, _camera.ProjectionMatrix, _gl.Width, _gl.Height);
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if (ray != null)
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{
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_nw.Select2d(ray, _camera.Zoom, _veccache);
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}
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_gl.Invalidate();
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}
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/// <summary>
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/// 鼠标双击
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/// </summary>
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public void MouseDoubleClick(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, _camera.ModelMatrix, _camera.ViewMatrix, _camera.ProjectionMatrix, _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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