using System;
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using System.Drawing;
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using System.Collections.Generic;
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using System.Linq;
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using OpenTK;
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using OpenTK.Graphics.OpenGL;
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using System.Windows.Forms;
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using System.Drawing.Imaging;
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using OpenTK.Mathematics;
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using OpenTK.GLControl;
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using System.Drawing.Text;
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using System.Security.Policy;
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namespace Yw.WinFrmUI.Test.Core
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{
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public partial class Form1 : Form
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{
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public Form1()
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{
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InitializeComponent();
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this.glControl1.Load += GlControl1_Load;
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this.glControl1.Paint += GlControl1_Paint;
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this.glControl1.Resize += GlControl1_Resize;
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this.glControl1.MouseDown += GlControl1_MouseDown;
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this.glControl1.MouseUp += GlControl1_MouseUp;
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this.glControl1.MouseWheel += GlControl1_MouseWheel;
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this.glControl1.MouseMove += GlControl1_MouseMove;
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}
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private void GlControl1_MouseMove(object sender, MouseEventArgs e)
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{
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HandleMouseMove(e);
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}
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private void GlControl1_MouseWheel(object sender, MouseEventArgs e)
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{
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HandleMouseWheel(e);
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}
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private void GlControl1_MouseUp(object sender, MouseEventArgs e)
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{
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HandleMouseUp(e);
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}
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private void GlControl1_MouseDown(object sender, MouseEventArgs e)
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{
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HandleMouseDown(e);
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}
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private void GlControl1_Resize(object sender, EventArgs e)
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{
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OnResize();
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}
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private void GlControl1_Paint(object sender, PaintEventArgs e)
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{
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OnRender();
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}
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private void GlControl1_Load(object sender, EventArgs e)
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{
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InitialGLState();
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}
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#region 字段声明
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private const float _size = 100f;
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private Matrix4 _modelMatrix = Matrix4.Identity;
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private Matrix4 _viewMatrix = Matrix4.Identity;
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private Matrix4 _projMatrix = Matrix4.Identity;
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private float _rotationX, _rotationY;
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private float _translationX, _translationY;
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private float _zoom = 1f;
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private bool _isDragging, _isRotating;
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private Point _lastMousePos;
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private float _radius = 100f;
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private float _pw, _ph;
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private Vector3 _mc = new Vector3(0f);
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private Vector3 _eye, _target, _up;
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private readonly int[] _textures = new int[6];
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private float _screenWidth, _screenHeight;
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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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#endregion
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#region OpenGL初始化
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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);
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GL.Enable(EnableCap.DepthTest);
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GL.Enable(EnableCap.Texture2D);
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GL.Enable(EnableCap.Blend);
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GL.BlendFunc(BlendingFactor.SrcAlpha, BlendingFactor.OneMinusSrcAlpha);
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// 生成六个面的文字纹理
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_textures[0] = CreateTextTexture("前", 128, Color.White, Color.Red);
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_textures[1] = CreateTextTexture("后", 128, Color.White, Color.Green);
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_textures[2] = CreateTextTexture("左", 128, Color.White, Color.Blue);
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_textures[3] = CreateTextTexture("右", 128, Color.White, Color.Yellow);
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_textures[4] = CreateTextTexture("上", 128, Color.White, Color.Magenta);
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_textures[5] = CreateTextTexture("下", 128, Color.White, Color.Cyan);
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}
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#endregion
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#region 矩阵更新
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private void UpdateMatrices()
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{
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if (!this.glControl1.IsHandleCreated)
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{
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return;
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}
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UpdateViewport();
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UpdateProjection();
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UpdateView();
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UpdateModel();
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}
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//更新视口
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private void UpdateViewport()
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{
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if (!this.glControl1.IsHandleCreated)
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{
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return;
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}
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_screenWidth = this.glControl1.Width;
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_screenHeight = this.glControl1.Height;
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GL.Viewport(0, 0, this.glControl1.Width, this.glControl1.Height);
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}
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private void UpdateProjection()
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{
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if (!this.glControl1.IsHandleCreated)
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{
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return;
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}
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// 获取窗口尺寸
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int screenWidth = ClientSize.Width;
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int screenHeight = ClientSize.Height;
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// 设置中心对齐的正交投影
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Matrix4 projection = Matrix4.CreateOrthographicOffCenter(
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left: -screenWidth / 2f,
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right: screenWidth / 2f,
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bottom: -screenHeight / 2f,
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top: screenHeight / 2f,
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depthNear: -1,
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depthFar: 1
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);
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_projMatrix = projection;
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//var aspect = this.glControl1.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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private void UpdateView()
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{
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_eye = new Vector3(_mc.X, _mc.Y, _mc.Z + 2 * _radius);
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_target = _mc;
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_up = Vector3.UnitY;
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//var rotation = Quaternion.Identity;
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//var rotationX = Quaternion.FromAxisAngle(Vector3.UnitX, _rotationX);
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//var rotationY = Quaternion.FromAxisAngle(Vector3.UnitY, _rotationY);
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// rotation = rotationY * rotationX * rotation;
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//rotation.Normalize();
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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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}
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private void UpdateModel()
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{
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_modelMatrix = Matrix4.CreateTranslation(new Vector3(_pw / 2f * this.Zoom, _ph / 2f * this.Zoom, 0)) *
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Matrix4.CreateFromAxisAngle(Vector3.UnitX, _rotationX) *
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Matrix4.CreateFromAxisAngle(Vector3.UnitY, _rotationY) *
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Matrix4.CreateTranslation(-new Vector3(_pw / 2f * this.Zoom, _ph / 2f * this.Zoom, 0)) *
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Matrix4.CreateTranslation(_translationX * this.Zoom, _translationY * this.Zoom, 0f);
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}
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#endregion
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#region 渲染逻辑
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private void OnRender()
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{
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if (!this.glControl1.IsHandleCreated)
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{
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return;
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}
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GL.Clear(ClearBufferMask.ColorBufferBit);
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GL.MatrixMode(MatrixMode.Modelview);
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GL.LoadIdentity();
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DrawReferenceLines();
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DrawRotatingObject();
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//SwapBuffers();
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//this.glControl1.MakeCurrent();
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//GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
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//// 设置矩阵
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//GL.MatrixMode(MatrixMode.Projection);
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//GL.LoadMatrix(ref _projMatrix);
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//GL.MatrixMode(MatrixMode.Modelview);
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//Matrix4 modelView = _viewMatrix * _modelMatrix;
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//GL.LoadMatrix(ref modelView);
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//// 绘制立方体
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////DrawCube();
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//// 绘制立方体
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//DrawTexturedCube();
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//var error = GL.GetError();
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//// 绘制标签
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////DrawLabels();
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//this.glControl1.SwapBuffers();
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}
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float rotationAngle = 45; // 测试角度
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void DrawRotatingObject()
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{
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GL.PushMatrix();
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// 关键变换顺序
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GL.Translate(100, 50, 0); // 将物体移动到屏幕坐标系中的(100,50)
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GL.Rotate(rotationAngle, Vector3.UnitZ); // 绕当前原点（屏幕中心）旋转
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// 绘制以原点为中心的物体
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GL.Color3(Color.Red);
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GL.Begin(PrimitiveType.Quads);
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GL.Vertex2(-25, -25);
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GL.Vertex2(25, -25);
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GL.Vertex2(25, 25);
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GL.Vertex2(-25, 25);
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GL.End();
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GL.PopMatrix();
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}
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void DrawReferenceLines()
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{
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//// 绘制屏幕中心十字
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//GL.Color3(Color.White);
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//GL.LineWidth(2);
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//GL.Begin(PrimitiveType.Lines);
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//// 水平线
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//GL.Vertex2(-1000, 0); GL.Vertex2(1000, 0);
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//// 垂直线
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//GL.Vertex2(0, -1000); GL.Vertex2(0, 1000);
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//GL.End();
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//// 绘制屏幕边框
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//GL.Color3(Color.Gray);
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//GL.Begin(PrimitiveType.LineLoop);
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//GL.Vertex2(-screenWidth / 2, -screenHeight / 2);
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//GL.Vertex2(screenWidth / 2, -screenHeight / 2);
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//GL.Vertex2(screenWidth / 2, screenHeight / 2);
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//GL.Vertex2(-screenWidth / 2, screenHeight / 2);
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//GL.End();
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}
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//改变
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private void OnResize()
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{
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if (!this.glControl1.IsHandleCreated)
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{
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return;
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}
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this.glControl1.MakeCurrent();
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// 防止OpenGL错误
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if (this.glControl1.Width == 0)
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{
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this.glControl1.Width = 1;
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}
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if (this.glControl1.Height == 0)
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{
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this.glControl1.Height = 1;
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}
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// 更新所有矩阵
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UpdateMatrices();
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// 请求重绘
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this.glControl1.Invalidate();
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}
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private void DrawCube()
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{
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GL.Begin(PrimitiveType.Quads);
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// 前面（Z+）
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//GL.Color3(Color.Purple);
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GL.Color4((float)Color.Purple.R, (float)Color.Purple.G, (float)Color.Purple.B, 1f);
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GL.Vertex3(-50f, -50f, 50f);
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GL.Vertex3(50f, -50f, 50f);
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GL.Vertex3(50f, 50f, 50f);
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//GL.Vertex3(50f, 50f, 50f);
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GL.Vertex3(-50f, 50f, 50f);
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// GL.Vertex3(-50f, -50f, 50f);
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// 后面（Z-）
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//GL.Color3(Color.Cyan);
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GL.Color4((float)Color.Cyan.R, (float)Color.Cyan.G, (float)Color.Cyan.B, 1f);
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GL.Vertex3(-50f, -50f, -50f);
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GL.Vertex3(-50f, 50f, -50f);
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GL.Vertex3(50f, 50f, -50f);
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//GL.Vertex3(50f, 50f, -50f);
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GL.Vertex3(50f, -50f, -50f);
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//GL.Vertex3(-50f, -50f, -50f);
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// 顶面（Y+）
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//GL.Color3(Color.Lime);
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GL.Color4((float)Color.Lime.R, (float)Color.Lime.G, (float)Color.Lime.B, 1f);
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GL.Vertex3(-50f, 50f, -50f);
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GL.Vertex3(50f, 50f, -50f);
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GL.Vertex3(50f, 50f, 50f);
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//GL.Vertex3(50f, 50f, 50f);
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GL.Vertex3(-50f, 50f, 50f);
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//GL.Vertex3(-50f, 50f, -50f);
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DrawTextOnFace("上", new Vector3(0, 50f, 0), new Vector3(0, 0, 100f));
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// 底面（Y-）
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//GL.Color3(Color.Yellow);
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GL.Color4((float)Color.Yellow.R, (float)Color.Yellow.G, (float)Color.Yellow.B, 1f);
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GL.Vertex3(-50f, -50f, -50f);
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GL.Vertex3(50f, -50f, -50f);
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GL.Vertex3(50f, -50f, 50f);
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//GL.Vertex3(50f, -50f, 50f);
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GL.Vertex3(-50f, -50f, 50f);
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//GL.Vertex3(-50f, -50f, -50f);
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// 右面（X+）
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//GL.Color3(Color.Red);
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GL.Color4((float)Color.Red.R, (float)Color.Red.G, (float)Color.Red.B, 1f);
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GL.Vertex3(50f, -50f, -50f);
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GL.Vertex3(50f, 50f, -50f);
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GL.Vertex3(50f, 50f, 50f);
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// GL.Vertex3(50f, 50f, 50f);
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GL.Vertex3(50f, -50f, 50f);
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//GL.Vertex3(50f, -50f, -50f);
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// 左面（X-）
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GL.Color4((float)Color.Blue.R, (float)Color.Blue.G, (float)Color.Blue.B, 1f);
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//GL.Color3(Color.Blue);
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GL.Vertex3(-50f, -50f, -50f);
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GL.Vertex3(-50f, 50f, -50f);
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GL.Vertex3(-50f, 50f, 50f);
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//GL.Vertex3(-50f, 50f, 50f);
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GL.Vertex3(-50f, -50f, 50f);
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//GL.Vertex3(-50f, -50f, -50f);
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GL.End();
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GL.End();
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}
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private void DrawFace(Vector3 v1, Vector3 v2, Vector3 v3, Vector3 v4, Color4 color, string text)
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{
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GL.Begin(PrimitiveType.Quads);
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GL.Color4(color);
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GL.Vertex3(v1);
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GL.Vertex3(v2);
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GL.Vertex3(v3);
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GL.Vertex3(v4);
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GL.End();
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Vector3 center = (v1 + v2 + v3 + v4) / 4;
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Vector3 normal = Vector3.Cross(v2 - v1, v3 - v1);
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DrawTextOnFace(text, center, normal);
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}
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private void DrawTextOnFace(string text, Vector3 position, Vector3 normal)
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{
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//GL.PushMatrix();
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//GL.Translate(position);
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//Vector3 up = Vector3.UnitY;
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//Vector3 right = Vector3.Cross(normal, up);
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// up = Vector3.Cross(right, normal);
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// Matrix4 rotation = new Matrix4(
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// new Vector4(right, 0),
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// new Vector4(up, 0),
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// new Vector4(-normal, 0),
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// new Vector4(0, 0, 0, 1));
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//GL.MultMatrix(ref rotation);
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using (Bitmap bmp = new Bitmap(100, 100))
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using (Graphics g = Graphics.FromImage(bmp))
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{
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g.TextRenderingHint = TextRenderingHint.AntiAlias;
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Font font = new Font("Arial", 12);
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SizeF textSize = g.MeasureString(text, font);
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float xOffset = (bmp.Width - textSize.Width) / 2;
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float yOffset = (bmp.Height - textSize.Height) / 2;
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g.DrawString(text, font, Brushes.Black, new PointF(xOffset, yOffset));
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int textureId = GL.GenTexture();
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GL.BindTexture(TextureTarget.Texture2D, textureId);
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BitmapData data = bmp.LockBits(new Rectangle(0, 0, bmp.Width, bmp.Height),
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ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
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GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba, data.Width, data.Height,
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0, OpenTK.Graphics.OpenGL.PixelFormat.Bgra, PixelType.UnsignedByte, data.Scan0);
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bmp.UnlockBits(data);
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GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Linear);
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GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Linear);
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GL.Enable(EnableCap.Texture2D);
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GL.Begin(PrimitiveType.Quads);
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GL.TexCoord2(0, 0); GL.Vertex3(-10, -10, 0);
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GL.TexCoord2(100, 0); GL.Vertex3(10, -10, 0);
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GL.TexCoord2(100, 100); GL.Vertex3(10, 10, 0);
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GL.TexCoord2(0, 100); GL.Vertex3(-10, 10, 0);
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GL.End();
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GL.Disable(EnableCap.Texture2D);
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GL.DeleteTexture(textureId);
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}
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// GL.PopMatrix();
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}
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private int CreateTextTexture(string text, int size, Color textColor, Color bgColor)
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{
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// 创建位图并绘制文字
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using (var bmp = new Bitmap(size, size))
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using (var gfx = Graphics.FromImage(bmp))
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{
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gfx.Clear(bgColor);
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var font = new Font("宋体", 32, FontStyle.Bold);
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var format = new StringFormat
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{
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Alignment = StringAlignment.Center,
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LineAlignment = StringAlignment.Center
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};
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gfx.DrawString(text, font, new SolidBrush(textColor),
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new RectangleF(0, 0, size, size), format);
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bmp.RotateFlip(RotateFlipType.RotateNoneFlipY);
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// 转换位图为OpenGL纹理
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var data = bmp.LockBits(
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new Rectangle(0, 0, bmp.Width, bmp.Height),
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ImageLockMode.ReadOnly,
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System.Drawing.Imaging.PixelFormat.Format32bppArgb);
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int texId = GL.GenTexture();
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GL.BindTexture(TextureTarget.Texture2D, texId);
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GL.TexImage2D(TextureTarget.Texture2D, 0,
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PixelInternalFormat.Rgba,
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data.Width, data.Height, 0,
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OpenTK.Graphics.OpenGL.PixelFormat.Bgra,
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PixelType.UnsignedByte, data.Scan0);
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// 设置纹理参数
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GL.TexParameter(TextureTarget.Texture2D,
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TextureParameterName.TextureMinFilter,
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(int)TextureMinFilter.Linear);
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GL.TexParameter(TextureTarget.Texture2D,
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TextureParameterName.TextureMagFilter,
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(int)TextureMagFilter.Linear);
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bmp.UnlockBits(data);
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return texId;
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}
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}
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private void DrawTexturedCube()
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{
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// 前面 (Z+)
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DrawFace(_textures[0], new[]
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{
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new Vector3(-50, -50, 50),
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new Vector3(50, -50, 50),
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new Vector3(50, 50, 50),
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new Vector3(-50, 50, 50)
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});
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// 后面 (Z-)
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DrawFace(_textures[1], new[]
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{
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new Vector3(50, -50, -50),
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new Vector3(-50, -50, -50),
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new Vector3(-50, 50, -50),
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new Vector3(50, 50, -50)
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});
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// 左面 (X-)
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DrawFace(_textures[2], new[]
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{
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new Vector3(-50, -50, -50),
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new Vector3(-50, -50, 50),
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new Vector3(-50, 50, 50),
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new Vector3(-50, 50, -50)
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});
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// 右面 (X+)
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DrawFace(_textures[3], new[]
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{
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new Vector3(50, -50, 50),
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new Vector3(50, -50, -50),
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new Vector3(50, 50, -50),
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new Vector3(50, 50, 50)
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});
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// 顶面 (Y+)
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DrawFace(_textures[4], new[]
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{
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new Vector3(-50, 50, 50),
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new Vector3(50, 50, 50),
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new Vector3(50, 50, -50),
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new Vector3(-50, 50, -50)
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});
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// 底面 (Y-)
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DrawFace(_textures[5], new[]
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{
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new Vector3(-50, -50, -50),
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new Vector3(50, -50, -50),
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new Vector3(50, -50, 50),
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new Vector3(-50, -50, 50)
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});
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}
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|
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private void DrawFace(int textureId, Vector3[] vertices)
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{
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GL.BindTexture(TextureTarget.Texture2D, textureId);
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GL.Begin(PrimitiveType.Quads);
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GL.TexCoord2(0, 0); GL.Vertex3(vertices[0]);
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GL.TexCoord2(1, 0); GL.Vertex3(vertices[1]);
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GL.TexCoord2(1, 1); GL.Vertex3(vertices[2]);
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GL.TexCoord2(0, 1); GL.Vertex3(vertices[3]);
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// 修正后的纹理坐标（翻转Y方向）
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//GL.TexCoord2(0, 1); GL.Vertex3(vertices[0]); // 左上→左下
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//GL.TexCoord2(1, 1); GL.Vertex3(vertices[1]); // 右上→右下
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//GL.TexCoord2(1, 0); GL.Vertex3(vertices[2]); // 右下→右上
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//GL.TexCoord2(0, 0); GL.Vertex3(vertices[3]); // 左下→左上
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GL.End();
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}
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|
|
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#endregion
|
|
#region 交互处理
|
|
/// <summary>
|
/// 处理鼠标滚轮
|
/// </summary>
|
public void HandleMouseWheel(MouseEventArgs e)
|
{
|
if (!this.glControl1.IsHandleCreated)
|
{
|
return;
|
}
|
this.Zoom *= e.Delta > 0 ? 0.9f : 1.1f;
|
UpdateMatrices();
|
this.glControl1.Invalidate();
|
}
|
|
/// <summary>
|
/// 处理鼠标按下
|
/// </summary>
|
public void HandleMouseDown(MouseEventArgs e)
|
{
|
if (!this.glControl1.IsHandleCreated)
|
{
|
return;
|
}
|
_lastMousePos = e.Location;
|
if (e.Button == MouseButtons.Right)
|
{
|
_isDragging = true;
|
this.glControl1.Cursor = Cursors.SizeAll; // 修改光标样式
|
}
|
else if (e.Button == MouseButtons.Left)
|
{
|
_isRotating = true;
|
this.glControl1.Cursor = Cursors.SizeAll; // 修改光标样式
|
}
|
}
|
|
/// <summary>
|
/// 处理鼠标弹起
|
/// </summary>
|
public void HandleMouseUp(MouseEventArgs e)
|
{
|
if (!this.glControl1.IsHandleCreated)
|
{
|
return;
|
}
|
_lastMousePos = e.Location;
|
if (e.Button == MouseButtons.Right)
|
{
|
_isDragging = false;
|
this.glControl1.Cursor = Cursors.Default;
|
}
|
else if (e.Button == MouseButtons.Left)
|
{
|
_isRotating = false;
|
this.glControl1.Cursor = Cursors.Default;
|
}
|
this.glControl1.Invalidate();
|
}
|
|
/// <summary>
|
/// 处理鼠标移动
|
/// </summary>
|
public void HandleMouseMove(MouseEventArgs e)
|
{
|
if (!this.glControl1.IsHandleCreated)
|
{
|
return;
|
}
|
float dx = e.X - _lastMousePos.X;
|
float dy = e.Y - _lastMousePos.Y;
|
|
if (_isRotating)
|
{
|
// 根据鼠标移动量计算旋转角度
|
var roation_dx = dy / _radius;
|
var rotaion_dy = dx / _radius;
|
_rotationX += roation_dx;
|
_rotationY += rotaion_dy;
|
UpdateMatrices();
|
}
|
else if (_isDragging)
|
{
|
float xratio = _pw / this.glControl1.Width;
|
float yratio = _ph / this.glControl1.Height;
|
_translationX += dx * xratio;
|
_translationY -= dy * yratio;
|
UpdateMatrices();
|
}
|
|
_lastMousePos = e.Location;
|
this.glControl1.Invalidate();
|
}
|
|
#endregion
|
|
|
|
|
}
|
}
|
