namespace unvell.D2DLib.Examples.Demos
{
	public partial class PieChart : DemoForm
	{
		List<PieInfo> pies = new List<PieInfo>();
		D2DBitmapGraphics m_MemoryBitmap;

		public PieChart()
		{
			Size = new Size(800, 1000);
			Text = "PieChart Demo - d2dlib Examples";
			CreateChart();
			m_MemoryBitmap = Device.CreateBitmapGraphics(ClientRectangle.Width, ClientRectangle.Height);
		}

		void CreateChart()
		{
			pies.Clear();

			// define the figure origin and size
			var figureOrigin = new D2DPoint(300, 300);
			var figureSize = new D2DSize(300, 300);
			Random random = new Random();

			var records = new float[2];
			records[0] = random.Next(0, 360);
			records[1] = 360 - records[0];

			float currentAngle = 270 - (records[0] / 2);

			// create pie geometries from records
			foreach (var record in records)
			{
				var angleSpan = record;

				var path = Device.CreatePieGeometry(figureOrigin, figureSize, currentAngle, currentAngle + angleSpan);
				pies.Add(new PieInfo { path = path, color = D2DColor.Randomly() });

				currentAngle += angleSpan;
			}

		}

		protected override void OnRender(D2DGraphics g)
		{
			base.OnRender(g);
			// draw background
			D2DBrush brush = Device.CreateSolidColorBrush(D2DColor.Silver);

			m_MemoryBitmap.BeginRender();
			m_MemoryBitmap.FillRectangle(100, 100, 400, 400, D2DColor.LightYellow);
			m_MemoryBitmap.FillEllipse(100, 300, 400, 400, D2DColor.AliceBlue);
			// draw pie geometries
			m_MemoryBitmap.FillPath(pies[0].path, pies[0].color);
			m_MemoryBitmap.DrawPath(pies[0].path, D2DColor.LightYellow, 2);
			//
			m_MemoryBitmap.FillPathWithBrush(pies[0].path, brush);
			//
			m_MemoryBitmap.DrawText("Click to change color", D2DColor.Red, 250, 550);
			m_MemoryBitmap.EndRender();

			g.DrawBitmap(m_MemoryBitmap, ClientRectangle);
			g.FillPathWithBrush(pies[1].path, brush);
			g.DrawPath(pies[1].path, D2DColor.Blue, 2);

			brush.Dispose();
		}

		protected override void OnMouseUp(MouseEventArgs e)
		{
			base.OnMouseUp(e);

			CreateChart();
			Invalidate();
		}
	}

	class PieInfo
	{
		public D2DGeometry path;
		public D2DColor color;
	}
}