DirextX编程

开发平台：
C#

XSceneControl.cs：源码内容
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// Copyright (c) 三峡大学水利与环境学院 肖泽云. All rights reserved.  //
////////////////////////////////////////////////////////////////////////
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;
using Microsoft.DirectX;
using Microsoft.DirectX.Direct3D;
using System.Collections;
namespace CTGU.XZY
{
    public partial class XSceneControl : UserControl
    {
        public Vector3 CamPostion = new Vector3(0, 100, 100);//定义摄像机位置
        public Vector3 CamTarget = new Vector3(125, 30, 125);//定义摄像机目标位置
        private Device device = null;//定义绘图设备
        private ArrayList lastCamPosAndTarg = new ArrayList();//记录上一次摄像机位置
        private int sceneIndex = 0;//记录当前场景的序号
        private float angleY = 0.01f;//定义绕Y轴旋转变量
        private int mouseLastX, mouseLastY;//记录鼠标按下时的坐标位置
        private bool isRotateByMouse = false;//记录是否由鼠标控制旋转
        private bool isMoveByMouse = false;//记录是否由鼠标控制移动
        private CustomVertex.PositionTextured[] vertices;//定义顶点变量
        private Texture texture;//定义贴图变量
        private Material material;//定义材质变量
        private VertexBuffer vertexBuffer;//定义顶点缓冲变量
        private IndexBuffer indexBuffer;//定义索引缓冲变量
        private int[] indices;//定义索引号变量
        private int xCount = 5, yCount = 4;//定义横向和纵向网格数目
        private float cellHeight = 1f, cellWidth = 1f;//定义单元的宽度和长度
        public string texturePath = Application.StartupPath + "\heightMap.BMP";// = @"E:DirectXDirectX_C#MediacolorMap.jpg";//定义贴图路径
        public string heightMapPath = Application.StartupPath + "\colorMap.jpg";// = @"E:DirectXDirectX_C#MediaheightMap.BMP";//定义高度图路径
        public XSceneControl()
        {
            InitializeComponent();
        }
        public bool InitializeDirect3D()
        {
            try
            {
                PresentParameters presentParams = new PresentParameters();
                presentParams.Windowed = true; //指定以Windows窗体形式显示
                presentParams.SwapEffect = SwapEffect.Discard; //当前屏幕绘制后它将自动从内存中删除
                presentParams.AutoDepthStencilFormat = DepthFormat.D16;
                presentParams.EnableAutoDepthStencil = true;
                presentParams.PresentationInterval = PresentInterval.Immediate;
                device = new Device(0, DeviceType.Hardware, this, CreateFlags.SoftwareVertexProcessing, presentParams); //实例化device对象
                Matrix viewMatrix = Matrix.LookAtLH(CamPostion, CamTarget, new Vector3(0, 1, 0));
                device.Transform.Projection = Matrix.PerspectiveFovLH((float)Math.PI / 4, this.Width / this.Height, 1f, 1000f);
                device.Transform.View = viewMatrix;
                lastCamPosAndTarg.Add(device.Transform.View);//记录这次摄像机的位置
                //VertexDeclaration();//定义顶点
                //IndicesDeclaration();//定义索引缓冲
                //LoadTexturesAndMaterials();//导入贴图和材质
                return true;
            }
            catch (DirectXException e)
            {
                MessageBox.Show(e.ToString(), "Error"); //处理异常
                return false;
            }
        }
        public void BuildTerrain(string heightmapPath,string texturemapPath)
        {
            heightMapPath = heightmapPath;
            texturePath = texturemapPath;
            VertexDeclaration();//定义顶点
            IndicesDeclaration();//定义索引缓冲
            LoadTexturesAndMaterials();//导入贴图和材质
            Render();
        }
        private void VertexDeclaration()//定义顶点
        {
            string bitmapPath = heightMapPath;
            Bitmap bitmap = new Bitmap(bitmapPath);
            xCount = (bitmap.Width - 1) / 2;
            yCount = (bitmap.Height - 1) / 2;
            cellWidth = bitmap.Width / xCount;
            cellHeight = bitmap.Height / yCount;
            vertexBuffer = new VertexBuffer(typeof(CustomVertex.PositionTextured), (xCount + 1) * (yCount + 1), device,
                Usage.Dynamic | Usage.WriteOnly, CustomVertex.PositionColored.Format, Pool.Default);
            vertices = new CustomVertex.PositionTextured[(xCount + 1) * (yCount + 1)];//定义顶点
            for (int i = 0; i < yCount + 1; i++)
            {
                for (int j = 0; j < xCount + 1; j++)
                {
                    Color color = bitmap.GetPixel((int)(j * cellWidth), (int)(i * cellHeight));
                    float height = float.Parse(color.R.ToString()) + float.Parse(color.G.ToString()) + float.Parse(color.B.ToString());
                    height /= 10;
                    vertices[j + i * (xCount + 1)].Position = new Vector3(j * cellWidth, height, i * cellHeight);
                    vertices[j + i * (xCount + 1)].Tu = (float)j / (xCount + 1);
                    vertices[j + i * (xCount + 1)].Tv = (float)i / (yCount + 1);
                }
            }
            vertexBuffer.SetData(vertices, 0, LockFlags.None);
            CamTarget = new Vector3(bitmap.Width / 2, 0f, bitmap.Height / 2);//设置摄像机目标位置
        }
        private void IndicesDeclaration()//定义索引
        {
            indexBuffer = new IndexBuffer(typeof(int), 6 * xCount * yCount, device, Usage.WriteOnly, Pool.Default);
            indices = new int[6 * xCount * yCount];
            for (int i = 0; i < yCount; i++)
            {
                for (int j = 0; j < xCount; j++)
                {
                    indices[6 * (j + i * xCount)] = j + i * (xCount + 1);
                    indices[6 * (j + i * xCount) + 1] = j + (i + 1) * (xCount + 1);
                    indices[6 * (j + i * xCount) + 2] = j + i * (xCount + 1) + 1;
                    indices[6 * (j + i * xCount) + 3] = j + i * (xCount + 1) + 1;
                    indices[6 * (j + i * xCount) + 4] = j + (i + 1) * (xCount + 1);
                    indices[6 * (j + i * xCount) + 5] = j + (i + 1) * (xCount + 1) + 1;
                }
            }
            indexBuffer.SetData(indices, 0, LockFlags.None);
        }
        private void LoadTexturesAndMaterials()//导入贴图和材质
        {
            material = new Material();
            material.Diffuse = Color.White;
            material.Specular = Color.LightGray;
            material.SpecularSharpness = 15.0F;
            device.Material = material;
            texture = TextureLoader.FromFile(device, texturePath);
        }
        /// <summary>
        /// 渲染场景
        /// </summary>
        public void Render()
        {
            if (device == null)   //如果device为空则不渲染
            {
                return;
            }
            device.Clear(ClearFlags.Target|ClearFlags.ZBuffer, Color.DarkSlateBlue, 1.0f, 0);  //清除windows界面为深蓝色
            device.BeginScene();
            //在此添加渲染图形代码
            device.RenderState.CullMode = Cull.None;
            device.RenderState.FillMode = FillMode.Solid;
            device.RenderState.Lighting = false;
            if (indices != null)
            {
                device.SetTexture(0, texture);//设置贴图
                device.VertexFormat = CustomVertex.PositionTextured.Format;
                device.SetStreamSource(0, vertexBuffer, 0);
                device.Indices = indexBuffer;
                device.DrawIndexedPrimitives(PrimitiveType.TriangleList, 0, 0, (xCount + 1) * (yCount + 1), 0, indices.Length / 3);
            }
            device.EndScene();
            device.Present();
        }
        protected override void OnKeyDown(KeyEventArgs e)
        {
            Vector4 tempV4;
            Matrix currentView = device.Transform.View;//当前摄像机的视图矩阵
            switch (e.KeyCode)
            {
                case Keys.Left:
                    CamPostion.Subtract(CamTarget);
                    tempV4 = Vector3.Transform(CamPostion, Matrix.RotationQuaternion(
                            Quaternion.RotationAxis(new Vector3(currentView.M12, currentView.M22, currentView.M32), -angleY)));
                    CamPostion.X = tempV4.X + CamTarget.X;
                    CamPostion.Y = tempV4.Y + CamTarget.Y;
                    CamPostion.Z = tempV4.Z + CamTarget.Z;
                    break;
                case Keys.Right:
                    CamPostion.Subtract(CamTarget);
                    tempV4 = Vector3.Transform(CamPostion, Matrix.RotationQuaternion(
                            Quaternion.RotationAxis(new Vector3(currentView.M12, currentView.M22, currentView.M32), angleY)));
                    CamPostion.X = tempV4.X + CamTarget.X;
                    CamPostion.Y = tempV4.Y + CamTarget.Y;
                    CamPostion.Z = tempV4.Z + CamTarget.Z;
                    break;
                case Keys.Up:
                    CamPostion.Subtract(CamTarget);
                    tempV4 = Vector3.Transform(CamPostion, Matrix.RotationQuaternion(
                       Quaternion.RotationAxis(new Vector3(device.Transform.View.M11
                       , device.Transform.View.M21, device.Transform.View.M31), -angleY)));
                    CamPostion.X = tempV4.X + CamTarget.X;
                    CamPostion.Y = tempV4.Y + CamTarget.Y;
                    CamPostion.Z = tempV4.Z + CamTarget.Z;
                    break;
                case Keys.Down:
                    CamPostion.Subtract(CamTarget);
                    tempV4 = Vector3.Transform(CamPostion, Matrix.RotationQuaternion(
                       Quaternion.RotationAxis(new Vector3(device.Transform.View.M11
                       , device.Transform.View.M21, device.Transform.View.M31), angleY)));
                    CamPostion.X = tempV4.X + CamTarget.X;
                    CamPostion.Y = tempV4.Y + CamTarget.Y;
                    CamPostion.Z = tempV4.Z + CamTarget.Z;
                    break;
                case Keys.Add:
                    CamPostion.Subtract(CamTarget);
                    CamPostion.Scale(0.95f);
                    CamPostion.Add(CamTarget);
                    break;
                case Keys.Subtract:
                    CamPostion.Subtract(CamTarget);
                    CamPostion.Scale(1.05f);
                    CamPostion.Add(CamTarget);
                    break;
            }
            Matrix viewMatrix = Matrix.LookAtLH(CamPostion, CamTarget, new Vector3(0, 1, 0));
            device.Transform.View = viewMatrix;
            Render();
        }
        protected override void OnMouseDown(MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                mouseLastX = e.X;
                mouseLastY = e.Y;
                isRotateByMouse = true;
            }
            else if (e.Button == MouseButtons.Middle)
            {
                mouseLastX = e.X;
                mouseLastY = e.Y;
                isMoveByMouse = true;
            }
            this.Focus();
        }
        protected override void OnMouseUp(MouseEventArgs e)
        {
            isRotateByMouse = false;
            isMoveByMouse = false;
            lastCamPosAndTarg.Add(device.Transform.View);//记录这次摄像机的位置
            if (lastCamPosAndTarg.Count > 10)
            {
                lastCamPosAndTarg.RemoveAt(0);
            }
            sceneIndex = lastCamPosAndTarg.Count;
        }
        protected override void OnMouseMove(MouseEventArgs e)
        {
            if (isRotateByMouse)
            {
                Matrix currentView = device.Transform.View;//当前摄像机的视图矩阵
                float tempAngleY = 2 * (float)(e.X - mouseLastX) / this.Width;
                CamPostion.Subtract(CamTarget);
                Vector4 tempV4 = Vector3.Transform(CamPostion, Matrix.RotationQuaternion(
                    Quaternion.RotationAxis(new Vector3(currentView.M12, currentView.M22, currentView.M32), tempAngleY)));
                CamPostion.X = tempV4.X;
                CamPostion.Y = tempV4.Y;
                CamPostion.Z = tempV4.Z;
                float tempAngleX = 4 * (float)(e.Y - mouseLastY) / this.Height;
                tempV4 = Vector3.Transform(CamPostion, Matrix.RotationQuaternion(
                    Quaternion.RotationAxis(new Vector3(currentView.M11, currentView.M21, currentView.M31), tempAngleX)));
                CamPostion.X = tempV4.X + CamTarget.X;
                CamPostion.Y = tempV4.Y + CamTarget.Y;
                CamPostion.Z = tempV4.Z + CamTarget.Z;
                Matrix viewMatrix = Matrix.LookAtLH(CamPostion, CamTarget, new Vector3(0, 1, 0));
                device.Transform.View = viewMatrix;
                mouseLastX = e.X;
                mouseLastY = e.Y;
                Render();
            }
            else if (isMoveByMouse)
            {
                Matrix currentView = device.Transform.View;//当前摄像机的视图矩阵
                float moveFactor = 0.01f;
                CamTarget.X += -moveFactor * ((e.X - mouseLastX) * currentView.M11 - (e.Y - mouseLastY) * currentView.M12);
                CamTarget.Y += -moveFactor * ((e.X - mouseLastX) * currentView.M21 - (e.Y - mouseLastY) * currentView.M22);
                CamTarget.Z += -moveFactor * ((e.X - mouseLastX) * currentView.M31 - (e.Y - mouseLastY) * currentView.M32);
                CamPostion.X += -moveFactor * ((e.X - mouseLastX) * currentView.M11 - (e.Y - mouseLastY) * currentView.M12);
                CamPostion.Y += -moveFactor * ((e.X - mouseLastX) * currentView.M21 - (e.Y - mouseLastY) * currentView.M22);
                CamPostion.Z += -moveFactor * ((e.X - mouseLastX) * currentView.M31 - (e.Y - mouseLastY) * currentView.M32);
                Matrix viewMatrix = Matrix.LookAtLH(CamPostion, CamTarget, new Vector3(0, 1, 0));
                device.Transform.View = viewMatrix;
                mouseLastX = e.X;
                mouseLastY = e.Y;
                Render();
            }
        }
        protected override void OnMouseWheel(MouseEventArgs e)
        {
            float scaleFactor = -(float)e.Delta / 2000 + 1f;
            CamPostion.Subtract(CamTarget);
            CamPostion.Scale(scaleFactor);
            CamPostion.Add(CamTarget);
            Matrix viewMatrix = Matrix.LookAtLH(CamPostion, CamTarget, new Vector3(0, 1, 0));
            device.Transform.View = viewMatrix;
            Render();
        }
        
        /// <summary>
        /// 返回上一视图
        /// </summary>
        public void LastScene()//上一次场景
        {
            if (sceneIndex >= 2)
            {
                sceneIndex = sceneIndex - 2;
                Matrix viewMatrix = (Matrix)lastCamPosAndTarg[sceneIndex];
                device.Transform.View = viewMatrix;
                Render();
            }
        }
        /// <summary>
        /// 返回下一视图
        /// </summary>
        public void NextScene()//下一次场景
        {
            if (sceneIndex < lastCamPosAndTarg.Count - 1)
            {
                sceneIndex = sceneIndex + 1;
                Matrix viewMatrix = (Matrix)lastCamPosAndTarg[sceneIndex];
                device.Transform.View = viewMatrix;
                Render();
            }
        }
        /// <summary>
        /// 查看附视图
        /// </summary>
        public void TopView()//附视图
        {
            CamPostion = new Vector3(100f, 50f, 100.001f);
            CamTarget = new Vector3(100f, 0f, 100f);
            Matrix viewMatrix = Matrix.LookAtLH(CamPostion, CamTarget, new Vector3(0, 1, 0));
            device.Transform.Projection = Matrix.OrthoLH((float)this.Width, (float)this.Height, 0.1f, 1000f);
            device.Transform.View = viewMatrix;
            Render();
        }
        /// <summary>
        /// 查看左视图
        /// </summary>
        public void LeftView()//左视图
        {
            CamPostion = new Vector3(-100f, 0f, 100.0f);
            CamTarget = new Vector3(100f, 0f, 100f);
            Matrix viewMatrix = Matrix.LookAtLH(CamPostion, CamTarget, new Vector3(0, 1, 0));
            device.Transform.View = viewMatrix;
            device.Transform.Projection = Matrix.OrthoLH((float)this.Width, (float)this.Height, 0.1f, 1000f);
            Render();
        }
        /// <summary>
        /// 查看前视图
        /// </summary>
        public void FrontView()//前视图
        {
            CamPostion = new Vector3(100f, 00f, -100.0f);
            CamTarget = new Vector3(100f, 0f, 100f);
            Matrix viewMatrix = Matrix.LookAtLH(CamPostion, CamTarget, new Vector3(0, 1, 0));
            device.Transform.View = viewMatrix;
            device.Transform.Projection = Matrix.OrthoLH((float)this.Width, (float)this.Height, 0.1f, 1000f);
            Render();
        }
        /// <summary>
        /// 放大视图
        /// </summary>
        public void ZoomIn()
        {
            float scaleFactor = 0.95f;
            CamPostion.Subtract(CamTarget);
            CamPostion.Scale(scaleFactor);
            CamPostion.Add(CamTarget);
            Matrix viewMatrix = Matrix.LookAtLH(CamPostion, CamTarget, new Vector3(0, 1, 0));
            device.Transform.View = viewMatrix;
            Render();
        }
        /// <summary>
        /// 缩小视图
        /// </summary>
        public void ZoomOut()
        {
            float scaleFactor = 1.05f;
            CamPostion.Subtract(CamTarget);
            CamPostion.Scale(scaleFactor);
            CamPostion.Add(CamTarget);
            Matrix viewMatrix = Matrix.LookAtLH(CamPostion, CamTarget, new Vector3(0, 1, 0));
            device.Transform.View = viewMatrix;
            Render();
        }
        /// <summary>
        /// 向左旋转
        /// </summary>
        public void RotateLeft()
        {
            Vector4 tempV4;
            Matrix currentView = device.Transform.View;//当前摄像机的视图矩阵
            CamPostion.Subtract(CamTarget);
            tempV4 = Vector3.Transform(CamPostion, Matrix.RotationQuaternion(
                    Quaternion.RotationAxis(new Vector3(currentView.M12, currentView.M22, currentView.M32), -angleY)));
            CamPostion.X = tempV4.X + CamTarget.X;
            CamPostion.Y = tempV4.Y + CamTarget.Y;
            CamPostion.Z = tempV4.Z + CamTarget.Z;
            Matrix viewMatrix = Matrix.LookAtLH(CamPostion, CamTarget, new Vector3(0, 1, 0));
            device.Transform.View = viewMatrix;
            Render();
        }
        /// <summary>
        /// 向右旋转
        /// </summary>
        public void RotateRight()
        {
            Vector4 tempV4;
            Matrix currentView = device.Transform.View;//当前摄像机的视图矩阵
            CamPostion.Subtract(CamTarget);
            tempV4 = Vector3.Transform(CamPostion, Matrix.RotationQuaternion(
                    Quaternion.RotationAxis(new Vector3(currentView.M12, currentView.M22, currentView.M32), angleY)));
            CamPostion.X = tempV4.X + CamTarget.X;
            CamPostion.Y = tempV4.Y + CamTarget.Y;
            CamPostion.Z = tempV4.Z + CamTarget.Z;
            Matrix viewMatrix = Matrix.LookAtLH(CamPostion, CamTarget, new Vector3(0, 1, 0));
            device.Transform.View = viewMatrix;
            Render();
        }
        /// <summary>
        /// 向上旋转
        /// </summary>
        public void RotateUp()
        {
            Vector4 tempV4;
            Matrix currentView = device.Transform.View;//当前摄像机的视图矩阵
            CamPostion.Subtract(CamTarget);
            tempV4 = Vector3.Transform(CamPostion, Matrix.RotationQuaternion(
               Quaternion.RotationAxis(new Vector3(device.Transform.View.M11
               , device.Transform.View.M21, device.Transform.View.M31), -angleY)));
            CamPostion.X = tempV4.X + CamTarget.X;
            CamPostion.Y = tempV4.Y + CamTarget.Y;
            CamPostion.Z = tempV4.Z + CamTarget.Z;
            Matrix viewMatrix = Matrix.LookAtLH(CamPostion, CamTarget, new Vector3(0, 1, 0));
            device.Transform.View = viewMatrix;
            Render();
        }
        /// <summary>
        /// 向下旋转
        /// </summary>
        public void RotateDown()
        {
            Vector4 tempV4;
            Matrix currentView = device.Transform.View;//当前摄像机的视图矩阵
            CamPostion.Subtract(CamTarget);
            tempV4 = Vector3.Transform(CamPostion, Matrix.RotationQuaternion(
               Quaternion.RotationAxis(new Vector3(device.Transform.View.M11
               , device.Transform.View.M21, device.Transform.View.M31), -angleY)));
            CamPostion.X = tempV4.X + CamTarget.X;
            CamPostion.Y = tempV4.Y + CamTarget.Y;
            CamPostion.Z = tempV4.Z + CamTarget.Z;
            Matrix viewMatrix = Matrix.LookAtLH(CamPostion, CamTarget, new Vector3(0, 1, 0));
            device.Transform.View = viewMatrix;
            Render();
        }
        /// <summary>
        /// 回到初始视图状态
        /// </summary>
        public void ResetView()
        {
            CamPostion = new Vector3(0, 100, 100);//定义摄像机位置
            CamTarget = new Vector3(125, 30, 125);//定义摄像机目标位置
            Matrix viewMatrix = Matrix.LookAtLH(CamPostion, CamTarget, new Vector3(0, 1, 0));
            device.Transform.Projection = Matrix.PerspectiveFovLH((float)Math.PI / 4, this.Width / this.Height, 0.1f, 1000f);
            device.Transform.View = viewMatrix;
            Render();
        }
        protected override void OnPaint(PaintEventArgs e)
        {
            Render();
        }
        
        protected override void OnResize(EventArgs e)
        {
            InitializeDirect3D();
            if (indices != null)
            {
                BuildTerrain(heightMapPath, texturePath);
            }
            Render();
        }  
         
    }
}

						