C:/Documents and Settings/student/My Documents/robo_magellan/visual_studio_(system_controller)/CompassDial/CompassDial/CompassDialForm.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace CompassDial {
        public partial class CompassDialForm : Form {
                Bitmap orig;

                public CompassDialForm() {
                        InitializeComponent();
                        orig = (Bitmap)compassDialPictureBox.Image;
                        brush1 = new SolidBrush(Color.Orange);
                        brush2 = new SolidBrush(Color.Black);
                        pen = new Pen(brush1, 4);
                        center = new PointF((float)(compassDialPictureBox.Width / 2 + 2)
                                , (float)(compassDialPictureBox.Height / 2 + 2));
                        f = new Font(FontFamily.GenericMonospace, 32);
                        textPoint = new PointF(80, 140);
                }

                private double getRadians(double degrees) {
                        return (Math.PI / 180) * (degrees - 90);
                }

                double angle = 0.0;
                float x = 0.0F;
                float y = 0.0F;
                Bitmap b;
                Graphics g;
                SolidBrush brush1;
                SolidBrush brush2;
                Pen pen;
                Font f;
                PointF center;
                PointF direction;
                PointF textPoint;

                public void drawCompassDial(double degrees) {
                        angle = getRadians(degrees);
                        x = (float)Math.Cos(angle) * 150 + 150;
                        y = (float)Math.Sin(angle) * 150 + 150;
                        direction.X = x + 8;
                        direction.Y = y + 8;
                        b = new Bitmap(orig);
                        g = Graphics.FromImage(b);
                        g.FillEllipse(brush1, x, y, 16, 16);
                        g.DrawLine(pen, center, direction);
                        g.DrawString(degrees.ToString(), f, brush2, textPoint);
                        compassDialPictureBox.Image = b;
                        compassDialPictureBox.Invalidate();
                }
        }
}

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