绘制三角形2

public partial class MainForm : Form

{

   public MainForm()

   {

       InitializeComponent();

       this.InitialDX();

   }

   private Device device;

   private void InitialDX()

   {

       PresentParameters presentParams = new PresentParameters();

       presentParams.Windowed = true;

       presentParams.SwapEffect = SwapEffect.Discard;

       device = new Device(

           0,

           DeviceType.Hardware,

           this,

           CreateFlags.SoftwareVertexProcessing,

           presentParams);

       device.RenderState.Lighting = false;

       device.RenderState.CullMode = Cull.None;

       //摄像机和投影设置

       Matrix camaraMx = Matrix.LookAtLH(

           new Vector3(0, 0, -150),

           new Vector3(0, 0, 0),

           new Vector3(0, 1, 0));

       Matrix projectionMx = Matrix.PerspectiveFovLH(

           (float)Math.PI / 4,

           this.Width / this.Height,

           10,

           200);

       device.Transform.Projection = projectionMx;

       device.Transform.View = camaraMx;

   }

   protected override void OnPaint(PaintEventArgs e)

   {

       base.OnPaint(e);

       this.DrawMyDX();

   }

   private void DrawMyDX()

   {

       device.Clear(ClearFlags.Target,

           Color.AliceBlue,

           1f,

           0);

       device.BeginScene();

       this.DrawMyGraphics();

       device.EndScene();

       device.Present();

   }

   private void DrawMyGraphics()

   {

       CustomVertex.PositionColored[] vertics = new CustomVertex.PositionColored[3];

       vertics[0].Position = new Vector3(

           -50, 0, 0);

       vertics[0].Color = Color.Red.ToArgb();

       vertics[1].Position = new Vector3(

           0, 30, 0);

       vertics[1].Color = Color.Green.ToArgb();

       vertics[2].Position = new Vector3(

           50, 0, 0);

       vertics[2].Color = Color.Blue.ToArgb();

       device.VertexFormat = CustomVertex.PositionColored.Format;

       device.DrawUserPrimitives(PrimitiveType.TriangleList,

           1,

           vertics);

   }

}

效果图：