using System;
using System.Drawing;
using System.Windows.Forms;
using Microsoft.DirectX;
using Microsoft.DirectX.Direct3D;

namespace DirectX_Tutorial
{
	public class WinForm : Form
	{
		private Device device;
		private float Theta = 0f;
		private CustomVertex.PositionColored[] Vertices;

		public WinForm()
		{
			this.ClientSize = new Size(640, 480);
			this.Name = "WinForm";
			this.Text = "DirectX Tutorial";
			InitializeDevice();
			InitializeVertices();
			CameraPositioning();
		}

		public void InitializeDevice()
		{
			PresentParameters PresParams = new PresentParameters();
			PresParams.Windowed = true;
			PresParams.SwapEffect = SwapEffect.Discard;
			device = new Device(0, DeviceType.Hardware, 
				this, CreateFlags.SoftwareVertexProcessing, PresParams); 
		}

		public void InitializeVertices()
		{
			Vertices = new CustomVertex.PositionColored[3];
			Vertices[0].Position = new Vector3(0f, 0f, 0f);
			Vertices[0].Color = Color.Yellow.ToArgb();
			Vertices[1].Position = new Vector3(10f, 0f, 0f);
			Vertices[1].Color = Color.Blue.ToArgb();
			Vertices[2].Position = new Vector3(5f, 10f, 0f);
			Vertices[2].Color = Color.Red.ToArgb();
		}

		public void CameraPositioning()
		{
			device.Transform.Projection = Matrix.PerspectiveFovLH((float)Math.PI/4,
				this.Width/this.Height, 1f, 50f);
			device.Transform.View = Matrix.LookAtLH(new Vector3(0f, 0f, 30f), new Vector3(0f, 0f, 0f),
				new Vector3(0f, 1f, 0f));
			device.RenderState.Lighting = false;
			device.RenderState.CullMode = Cull.None;
		}

		protected override void OnPaint(PaintEventArgs args)
		{
			device.Clear(ClearFlags.Target, Color.DarkBlue, 1.0f, 0);

			device.BeginScene();
			device.VertexFormat = CustomVertex.PositionColored.Format;
			device.Transform.World = Matrix.RotationX(Theta);
			device.DrawUserPrimitives(PrimitiveType.TriangleList, 1, Vertices);
			device.EndScene();

			device.Present();
			Theta += 0.05f;
		}

		static void Main() 
		{
			using (WinForm our_dx_form = new WinForm())
			{
				Application.Run(our_dx_form);
			}
		}
	}
}