Measurements

public class DistanceMeterRubberband: Aurigma.GraphicsMill.WinControls.UserInputController, Aurigma.GraphicsMill.WinControls.IRubberband
{
	//
	// Construction / destruction
	//
	public DistanceMeterRubberband()
	{	
		points = new System.Drawing.Point[2];			
		points[0] = System.Drawing.Point.Empty;
		points[1] = System.Drawing.Point.Empty;

		waitingIndex = 0;

		pen = new System.Drawing.Pen(System.Drawing.Color.Red, 1.0f);
		brush = new System.Drawing.SolidBrush(System.Drawing.Color.Green);
	}


	#region "Distance calculation"
	public double PixelDistance
	{
		get
		{
			double dx = Math.Abs(points[0].X - points[1].X) + 1;
			double dy = Math.Abs(points[0].Y - points[1].Y) + 1;
			
			return Math.Sqrt(dx * dx + dy * dy);
		}
	}


	public double InchDistance
	{
		get
		{
			return GetUnitDistance(Aurigma.GraphicsMill.Unit.Inch);
		}
	}


	public double MmDistance
	{
		get
		{
			return GetUnitDistance(Aurigma.GraphicsMill.Unit.Mm);
		}
	}


	private double GetUnitDistance(Aurigma.GraphicsMill.Unit destinationUnit)
	{
		int pixelsDx = Math.Abs(points[0].X - points[1].X) + 1;
		int pixelsDy = Math.Abs(points[0].Y - points[1].Y) + 1;

		double unitDx = Aurigma.GraphicsMill.UnitConverter.ConvertPixelsToUnits(this.BitmapViewer.Bitmap.HorizontalResolution, pixelsDx, destinationUnit);
		double unitDy = Aurigma.GraphicsMill.UnitConverter.ConvertPixelsToUnits(this.BitmapViewer.Bitmap.VerticalResolution, pixelsDy, destinationUnit);

		return Math.Sqrt(unitDx * unitDx + unitDy * unitDy);
	}
	#endregion //"Distance calculation"


	#region "Overloaded methods from UserInputController"
	protected override void OnBitmapViewerMouseDown(System.Windows.Forms.MouseEventArgs e)
	{
		if (!this.IsBitmapLoaded)
			return;

		System.Drawing.Point bitmapPoint = this.BitmapViewer.ControlToBitmapPoint(new System.Drawing.Point(e.X, e.Y));
		if (bitmapPoint.X < 0 || bitmapPoint.X >= this.BitmapViewer.Bitmap.Width ||
			bitmapPoint.Y < 0 || bitmapPoint.Y >= this.BitmapViewer.Bitmap.Height)
			return;

		points[waitingIndex] = bitmapPoint;
		waitingIndex = (waitingIndex + 1) % 2;

		this.BitmapViewer.Invalidate();
	}


	protected override void OnBitmapViewerDoubleBufferPaint(System.Windows.Forms.PaintEventArgs e)
	{
		if(!IsBitmapLoaded)
			return;

		DrawAnchorPoint(e.Graphics, points[0]);
		DrawAnchorPoint(e.Graphics, points[1]);
	}
	#endregion


	#region "Drawing stuff"
	private void DrawAnchorPoint(System.Drawing.Graphics g, System.Drawing.Point pnt)
	{
		System.Drawing.Point controlPnt = this.BitmapViewer.BitmapToControlPoint(pnt);

		int radius = 4;
		g.FillEllipse(brush, controlPnt.X - radius, controlPnt.Y - radius, radius * 2, radius * 2);
		g.DrawEllipse(pen, controlPnt.X - radius, controlPnt.Y - radius, radius * 2, radius * 2);			
	}
	#endregion


	#region "Private variables"
	private System.Drawing.Point[] points;
	private int waitingIndex;
	
	private System.Drawing.Pen pen;
	private System.Drawing.Brush brush;
	#endregion //"Private variables"
}

bitmapViewer.Rubberband = new DistanceMeterRubberband();

private void bitmapViewer_BitmapMouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
{
	if (bitmapViewer.Bitmap.IsEmpty)
		return;

	DistanceMeterRubberband dr = (DistanceMeterRubberband)bitmapViewer.Rubberband;

	pixelDistanceLabel.Text = String.Format("Pixels: {0:F}", dr.PixelDistance);
	inchDistanceLabel.Text = String.Format("Inches: {0:F}", dr.InchDistance);
	mmDistanceLabel.Text = String.Format("Mm: {0:F}", dr.MmDistance);
}