New Post: Map Reference scale

using System;using System.Drawing;using System.Drawing.Drawing2D;using GMap.NET.WindowsForms;namespace Ferramentas.Mapas {publicclass Escala : GMapControl {public Escala() : base() {
        }#region Scale variables///<summary>/// The font for the m/km markers///</summary>private Font fontCustomScale = new Font("Arial", 6);///<summary>/// The font for the scale header ///</summary>private Font fontCustomScaleBold = new Font("Arial", 10, FontStyle.Bold);///<summary>/// The brush for the scale's background///</summary>private Brush brushCustomScaleBackColor = new SolidBrush(Color.FromArgb(200, 185, 215, 255));///<summary>/// The Textcolor for the scale's fonts///</summary>private Color colorCustomScaleText = Color.FromArgb(20, 65, 140);///<summary>/// The width of the scale-rectangle///</summary>privateint intScaleRectWidth = 300;///<summary>/// The height of the scale-rectangle///</summary>privateint intScaleRectHeight = 50;///<summary>/// The height of the scale bar///</summary>privateint intScaleBarHeight = 10;///<summary>/// The padding of the scale///</summary>privateint intScaleLeftPadding = 10;#endregion///<summary>/// Draw extra stuff here (E.g. a legend for the map)///</summary>///<param name="drawingContext"></param>protectedoverridevoid OnPaintOverlays(System.Drawing.Graphics g) {base.OnPaintOverlays(g);

            g.SmoothingMode = SmoothingMode.HighQuality;

            //if (ShowCustomScale) {double resolution = this.MapProvider.Projection.GetGroundResolution((int)this.Zoom, Position.Lat);int px10 = (int)(10.0 / resolution);            // 10 metersint px100 = (int)(100.0 / resolution);          // 100 metersint px1000 = (int)(1000.0 / resolution);        // 1km   int px10000 = (int)(10000.0 / resolution);      // 10km  int px100000 = (int)(100000.0 / resolution);    // 100km  int px1000000 = (int)(1000000.0 / resolution);  // 1000kmint px5000000 = (int)(5000000.0 / resolution);  // 5000km//Check how much width we have and set the scale accordinglyint availableWidth = (intScaleRectWidth - 2 * intScaleLeftPadding);//5000 kilometers:if (availableWidth >= px5000000)
                    DrawScale(g, px5000000, availableWidth, 5000, "km");//1000 kilometers:elseif (availableWidth >= px1000000)
                    DrawScale(g, px1000000, availableWidth, 1000, "km");//100 kilometers:elseif (availableWidth >= px100000)
                    DrawScale(g, px100000, availableWidth, 100, "km");//10 kilometers:elseif (availableWidth >= px10000)
                    DrawScale(g, px10000, availableWidth, 10, "km");//1 kilometers:elseif (availableWidth >= px1000)
                    DrawScale(g, px1000, availableWidth, 1, "km");//100 meters:elseif (availableWidth >= px100)
                    DrawScale(g, px100, availableWidth, 100, "m");//10 meters:elseif (availableWidth >= px10)
                    DrawScale(g, px10, availableWidth, 10, "m");//}
        }///<summary>/// Draw the scale///</summary>///<param name="g"></param>///<param name="resLength"></param>///<param name="availableWidth"></param>///<param name="totalDimenson"></param>///<param name="unit"></param>privatevoid DrawScale(System.Drawing.Graphics g, int resLength, int availableWidth, int totalDimenson, String unit) {
            Point p = new System.Drawing.Point(this.Width - (intScaleRectWidth + 10), this.Height - (intScaleRectHeight + 10));
            Rectangle rect = new Rectangle(p, new Size(intScaleRectWidth, intScaleRectHeight));
            g.FillRectangle(brushCustomScaleBackColor, rect);
            Pen pen = new Pen(colorCustomScaleText, 1);
            g.DrawRectangle(pen, rect);
            SizeF stringSize = new SizeF();
            Point pos = new Point();//Header:
            String scaleString = "Escala Gr�fica";
            stringSize = g.MeasureString(scaleString, fontCustomScaleBold);
            pos = new Point(p.X + (rect.Width - (int)stringSize.Width) / 2, p.Y + 3);
            g.DrawString(scaleString, fontCustomScaleBold, pen.Brush, pos);

            pos = new Point(p.X + intScaleLeftPadding, pos.Y + 30);//How many rectangles fit?int numRects = availableWidth / resLength;
            Size rectSize = new Size(resLength, intScaleBarHeight);//Center rectangle
            pos.X += (availableWidth - resLength * numRects) / 2;//Draw rectangles:for (int i = 0; i < numRects; i++) {
                Rectangle r = new Rectangle(pos, rectSize);if (i % 2 == 0)
                    g.FillRectangle(pen.Brush, r);else
                    g.DrawRectangle(pen, r);//Draw little vertical lines
                g.DrawLine(pen, pos, new Point(pos.X, pos.Y - 5));//Draw labels:int dist = i * totalDimenson;
                stringSize = g.MeasureString(dist + " " + unit, fontCustomScale);
                g.DrawString(dist + " " + unit, fontCustomScale, pen.Brush, new Point(pos.X - (int)stringSize.Width / 2, pos.Y - (7 + (int)stringSize.Height)));//Finally set new point
                pos = new Point(pos.X + resLength, pos.Y);
            }//Draw last line:
            g.DrawLine(pen, pos, new Point(pos.X, pos.Y - 5));//Draw last labelint m = numRects * totalDimenson;
            stringSize = g.MeasureString(m + " " + unit, fontCustomScale);
            g.DrawString(m + " " + unit, fontCustomScale, pen.Brush, new Point(pos.X - (int)stringSize.Width / 2, pos.Y - (7 + (int)stringSize.Height)));
        }
    }
}

Escala escala = new Escala();
escala.MapScaleInfoEnabled = true;