Code

using System.Drawing;

using MindFusion.Diagramming;
using MindFusion.Drawing;


namespace MyApp
{
	class PercentageNode : DiagramNode
	{
		public PercentageNode(Diagram parent) : base(parent)
		{
			Value = 50;
			base.Font = new Font("Arial", 10);
		}

		public override void DrawLocal(IGraphics graphics, RenderOptions options)
		{
			// draw background
			var rect = GetLocalBounds();
			graphics.FillRectangle(Brushes.White, rect);

			// draw progress
			var valueRect = rect;
			valueRect.Width *= Value / 100;
			graphics.FillRectangle(Brushes.Green, valueRect);

			// draw frame
			graphics.DrawRectangle(Pens.Black, rect);

			// value label
			var format = new StringFormat
			{
				Alignment = StringAlignment.Near,
				LineAlignment = StringAlignment.Center
			};
			graphics.DrawString(ValueString,
				Font, Brushes.Black, rect.Right + 2, rect.Height / 2, format);
		}

		public override RectangleF GetRepaintRect(bool includeConnected)
		{
			var rect = base.GetRepaintRect(includeConnected);
			rect.Width += 3 + Parent.MeasureString(
				ValueString, Font, int.MaxValue, new StringFormat()).Width;
			return rect;
		}

		public float Value { get; set; }

		private string ValueString
		{
			get { return Value + "%";  }
		}
	}
}