using?System;
using?System.Collections.Generic;
using?System.Drawing;
using?System.Windows.Forms;
using?OpenTK;
using?OpenTK.Graphics;
using?OpenTK.Graphics.OpenGL;
using?OpenTK.Platform;
using?OpenTK.Input;


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namespace?Picking
{
????class?Pick:?GameWindow?
????{
????????//判斷鼠標(biāo)是否按下
????????private?bool?isRButtonDown;
????????private?bool?isLButtonDown;
????????//選擇緩存
????????private?int[]?selectBuf=new?int[1024];
????????//鼠標(biāo)位置
????????private?Point?mousepos;
????????//點(diǎn)擊的數(shù)量，與拾取視口相交的物體的數(shù)量
????????private?int?intersetion;
????????//視口
????????private?int[]?view=new?int[4];

????????//創(chuàng)建一個(gè)800*600的窗口，32位真彩色，8位深度，8位模板緩存，8倍多重采樣
????????//多重采樣需要顯卡支持
????????public?Pick（）:base（800600new?GraphicsMode（32888）“OpenTK?Picking“GameWindowFlags.FixedWindow）
????????{
????????????//添加兩個(gè)事件處理
????????????MouseDown?+=?Pick_MouseDown;
????????????MouseUp?+=?Pick_MouseUp;
????????}

????????//鼠標(biāo)按鍵釋放
????????void?Pick_MouseUp（object?sender?OpenTK.Input.MouseButtonEventArgs?e）
????????{
????????????if?（e.Mouse.IsButtonUp（MouseButton.Left））
????????????{
????????????????isLButtonDown?=?false;
????????????}
????????????if?（e.Mouse.IsButtonUp（MouseButton.Right））
????????????{
????????????????isRButtonDown?=?false;
????????????}
????????????mousepos?=?e.Position;
????????}

????????//鼠標(biāo)按鍵按下
????????void?Pick_MouseDown（object?sender?OpenTK.Input.MouseButtonEventArgs?e）
????????{
????????????if（e.Mouse.IsButtonDown（MouseButton.Left））
????????????{
????????????????isLButtonDown=true;
????????????}
????????????if?（e.Mouse.IsButtonDown（MouseButton.Right））
????????????{
????????????????isRButtonDown?=?true;
????????????}
????????????mousepos?=?e.Position;
????????}


????????protected?override?void?onload（EventArgs?e）
????????{
????????????base.onload（e）;
????????????GL.ClearColor（0.5f?0.5f?0.5f?1.0f）;
????????}

????????//改變窗口時(shí)，更新視口
????????protected?override?void?onresize（EventArgs?e）
????????{
????????????base.onresize（e）;
????????????GL.Viewport（0?0?Width?Height）;
????????????GL.MatrixMode（MatrixMode.Projection）;
????????????GL.LoadIdentity（）;
????????}

????????protected?override?void?OnUpdateframe（frameEventArgs?e）
????????{
????????????base.OnUpdateframe（e）;
????????}
????????
????????//重寫繪圖函數(shù)
????????protected?override?void?OnRenderframe（frameEventArgs?e）
????????{
????????????base.OnRenderframe（e）;
????????????GL.Clear（ClearBufferMask.ColorBufferBit|ClearBufferMask.DepthBufferBit?）;
????????????GL.ClearColor（0.5f?0.5f?0.5f?1.0f）;
????????????//啟用混合
????????????GL.Enable（EnableCap.Blend）;
????????????GL.BlendFunc（BlendingFactorSrc.SrcAlpha?BlendingFactorDest.OneMinusSrcAlpha）;
????????????//啟用深度測試
????????????GL.Enable（EnableCap.DepthTest）;

????????????GL.MatrixMode（MatrixMode.Projection）;
????????????GL.LoadIdentity（）;
????????????//相當(dāng)于gluPerspective
????????????Matrix4?perspective??=?Matrix4