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

namespace CTWindows
{
	public partial class CT3DGraph : UserControl
	{
		private Device device = null;
		private PresentParameters presentParams = null;

		private CustomVertex.PositionColored[] verts;

		public CT3DGraph()
		{
			InitializeComponent();
			this.InitialiseGraphics();
			
			this.SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.Opaque, true);
		}

		#region Initialise
		public void InitialiseGraphics()
		{
			// Set our presentation parameters
			presentParams = new PresentParameters();
			presentParams.Windowed = true;
			presentParams.SwapEffect = SwapEffect.Discard;
			presentParams.DeviceWindowHandle = this.Handle;

			//create our device
			device = new Device(0, DeviceType.Hardware, this, CreateFlags.SoftwareVertexProcessing, presentParams);

			//initialise data
			initialiseObjects();
		}

		private void initialiseObjects()
		{
			verts = new CustomVertex.PositionColored[3];
			verts[0].Position = new Vector3(0.0f, 1.0f, 1.0f);
			verts[0].Color = System.Drawing.Color.Aqua.ToArgb();
			verts[1].Position = new Vector3(-1.0f, -1.0f, 1.0f);
			verts[1].Color = System.Drawing.Color.Black.ToArgb();
			verts[2].Position = new Vector3(1.0f, -1.0f, 1.0f);
			verts[2].Color = System.Drawing.Color.Purple.ToArgb();
		}
		#endregion

		#region Render 
		protected override void OnPaint(PaintEventArgs e)
		{
			device.Clear(ClearFlags.Target, System.Drawing.Color.CornflowerBlue, 1.0f, 0);

			this.SetupCamera();

			device.BeginScene();
			drawObjects();
			device.EndScene();
			
			device.Present();
			this.Invalidate();
		}		

		private void SetupCamera()
		{
			device.Transform.Projection = Matrix.PerspectiveFovLH((float)Math.PI / 4,
				 this.Width / this.Height, 1.0f, 100.0f);
			device.Transform.View = Matrix.LookAtLH(new Vector3(0, 0, 5.0f), new Vector3(),
				 new Vector3(0, 1, 0));

			device.RenderState.Lighting = false;
			device.Transform.World = Matrix.RotationZ((System.Environment.TickCount / 450.0f) / (float)Math.PI);
		}

		private void drawObjects()
		{
			device.VertexFormat = CustomVertex.PositionColored.Format;
			device.DrawUserPrimitives(PrimitiveType.TriangleList, 1, verts);
		}
		#endregion

	}
}