绘制三角形

代码：

public partial class MainForm : Form

{

   public MainForm()

   {

       InitializeComponent();

       this.InitialDX();

   }

   private Device device = null;

   private void InitialDX()

   {

       PresentParameters presentParams = new PresentParameters();

       presentParams.Windowed = true;

       presentParams.SwapEffect = SwapEffect.Discard;

       device = new Device(

           0,

           DeviceType.Hardware,

           this,

           CreateFlags.SoftwareVertexProcessing,

           presentParams);

   }

   protected override void OnPaint(PaintEventArgs e)

   {

       base.OnPaint(e);

       this.DrawDX();

   }

   private void DrawDX()

   {

       if (this.device == null)

           return;

       this.device.Clear(ClearFlags.Target,

           Color.AliceBlue,

           1f,

           0);

       this.device.BeginScene();

       //绘制DX图形

       this.DrawMyGraphics();

       this.device.EndScene();

       this.device.Present();//显示图形

   }

   private void DrawMyGraphics()

   {

       CustomVertex.TransformedColored[] vertex =

           new CustomVertex.TransformedColored[3];

       vertex[0].Position = new Vector4(

           0,

           this.Height,

           0,

           0);

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

       vertex[1].Position = new Vector4(

           this.Width / 2,

           0,

           0,

           0);

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

       vertex[2].Position = new Vector4(

           this.Width,

           this.Height,

           0,

           0);

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

       this.device.VertexFormat = CustomVertex.TransformedColored.Format;

       this.device.DrawUserPrimitives(PrimitiveType.TriangleList,

           1,

           vertex);

   }

}

 

结果：

绘制三角形的代码主要在DrawMyGraphics中。需要注意的是顶点的索引是顺时针的，如果是逆时针，结果就没有三角形了，需要进行特殊设置。

device.RenderState.CullMode = Cull.None;