OpenTK Tutorial 1－天天向上

新增主控台應用程式

輸入關鍵字”openTK”

安裝後，在你專案的參考中應該會出現OpenTK套件

1. 加入命名空間OpenTK

2. 新增一個Game類別繼承GameWindow

   1: using System;   2: using System.Collections.Generic;   3: using System.Linq;   4: using System.Text;   5: using System.Threading.Tasks;   6: using OpenTK;   7:     8: namespace OpenTKTutorial1   9: {  10:     class Program  11:     {  12:         static void Main(string[] args)  13:         {  14:         }  15:     }  16:     class Game:GameWindow  17:     {  18:    19:     }  20: }

產生Game實體，其中30.0表示更新頻率

   1: class Program   2: {   3:     static void Main(string[] args)   4:     {   5:         using (Game game = new Game())   6:         {   7:             game.Run(30.0);   8:         }   9:     }  10: }

執行後會產生一個OpenTK Game視窗

輸入override，按下空白鍵後會跳出符合的下拉清單，例如OnLoad

   1: class Game:GameWindow   2: {   3:     protected override void OnLoad(EventArgs e)   4:     {   5:         base.OnLoad(e);   6:     }   7: }

改變標題，可以在載入階段修改屬性

   1: class Game:GameWindow   2: {   3:        4:     protected override void OnLoad(EventArgs e)   5:     {   6:         Title = "你好嗎?";   7:         base.OnLoad(e);   8:     }   9: }

執行畫面如下:

加入參考 System.Drawing

   1: using System.Text;   2: using System.Threading.Tasks;   3: using OpenTK;   4: using OpenTK.Graphics.OpenGL;   5: using System.Drawing;   6:     7: namespace OpenTKTutorial1   8: {   9:     class Program  10:     {  11:         static void Main(string[] args)  12:         {  13:             using (Game game = new Game())  14:             {  15:                 game.Run(30.0);  16:             }  17:         }  18:     }  19:     class Game:GameWindow  20:     {  21:           22:         protected override void OnLoad(EventArgs e)  23:         {  24:             base.OnLoad(e);  25:             Title = "你好嗎?";  26:             GL.ClearColor(Color.AliceBlue);  27:         }  28:    29:     }  30: }

執行畫面如下: 目前還看不出顏色效果

仿照剛才OnLoad，再次我們覆寫OnRenderFrame

   1: protected override void OnRenderFrame(FrameEventArgs e)   2: {   3:    base.OnRenderFrame(e);   4:    GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);   5:    SwapBuffers();   6: }

執行畫面如下: 目前顏色效果發生作用

   1: protected override void OnRenderFrame(FrameEventArgs e)   2: {   3:     base.OnRenderFrame(e);   4:     GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);   5:     6:     7:     GL.Begin(BeginMode.Triangles);   8:     9:     GL.Vertex3(-1.0f, -1.0f, 4.0f);  10:    11:     GL.Vertex3(1.0f, -1.0f, 4.0f);  12:    13:     GL.Vertex3(0.0f, 1.0f, 4.0f);  14:    15:     GL.End();  16:    17:     Matrix4 modelview = Matrix4.LookAt(Vector3.Zero, Vector3.UnitZ, Vector3.UnitY);  18:     GL.MatrixMode(MatrixMode.Modelview);  19:     GL.LoadMatrix(ref modelview);  20:    21:     SwapBuffers();  22: }

   1: protected override void OnRenderFrame(FrameEventArgs e)   2:   {   3:       base.OnRenderFrame(e);   4:       GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);   5:     6:     7:       GL.Begin(BeginMode.Triangles);   8:     9:       // 三角形頂點座標  10:       GL.Vertex3(-1.0f, -1.0f, 4.0f);  11:    12:       GL.Vertex3(1.0f, -1.0f, 4.0f);  13:    14:       GL.Vertex3(0.0f, 1.0f, 4.0f);  15:    16:       // 塗上漸層色  17:       GL.Color3(1.0f, 0.0f, 0.0f);  18:       GL.Vertex3(-1.0f, -1.0f, 4.0f);  19:    20:       GL.Color3(0.0f, 1.0f, 0.0f);  21:       GL.Vertex3(1.0f, -1.0f, 4.0f);  22:    23:       GL.Color3(0.0f, 0.0f, 1.0f);  24:       GL.Vertex3(0.0f, 1.0f, 4.0f);  25:    26:       GL.End();  27:    28:       Matrix4 modelview = Matrix4.LookAt(Vector3.Zero, Vector3.UnitZ, Vector3.UnitY);  29:       GL.MatrixMode(MatrixMode.Modelview);  30:       GL.LoadMatrix(ref modelview);  31:    32:       // 將buffer轉換至螢幕畫面  33:       SwapBuffers();  34:   }