Get Distance Between Two Math Points Example (C#)

//-------------------------------------------------------------------
// Preconditions:
// 1. Create a C# Windows console project.
// 2. Copy and paste this project into the C# IDE.
// 3. Add a reference to:
//    install_dir\APISDK\tlb\DraftSight.Interop.dsAutomation.
// 4. Add references to System and System.Windows.Forms.
// 5. Start DraftSight.
// 6. Run the macro.
// 7. Select two points when prompted in the DraftSight command window.
//
// Postconditions: The distance between two math points is printed in
// the DraftSight command window.
//-------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.Text;
using DraftSight;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace GetDistance
{
    class Program
    {
        private static DraftSight.Application dsApp;

        static void Main(string[] args)
        {
            //Connect to DraftSight application
            dsApp = ConnectToDraftSight();
            if (null == dsApp)
            {
                return;
            }

            dsApp.AbortRunningCommand(); // abort any command currently running in DraftSight to avoid nested commands

            //Get active document
            Document dsDoc = dsApp.GetActiveDocument();
            if (null == dsDoc)
            {
                MessageBox.Show("There are no open documents in DraftSight.");
                return;
            }

            //Get math utility
            MathUtility dsMathUtility = dsApp.GetMathUtility();

            //Get distance between two points
            GetDistance(dsMathUtility);
        }

        private static DraftSight.Application ConnectToDraftSight()
        {
            DraftSight.Application dsApp = null;

            try
            {
                //Connect to DraftSight
                dsApp = (DraftSight.Application)Marshal.GetActiveObject("DraftSight.Application");
            }
            catch (Exception ex)
            {
                MessageBox.Show("Failed to connect to DraftSight. Cause: " + ex.Message);
                dsApp = null;
            }

            return dsApp;
        }

        private static void GetDistance(MathUtility dsMathUtility)
        {
            //Get command message
            CommandMessage dsCommandMessage = dsApp.GetCommandMessage();

            dsCommandMessage.PrintLine("Get distance between two points");

            //Prompt to select the first point and second points
            //to calculate the distance between them
            double firstX, firstY, firstZ;
            double secondX, secondY, secondZ;
            if (dsCommandMessage.PromptForPoint("Specify the first point", out firstX, out firstY, out firstZ) &&
                dsCommandMessage.PromptForPoint("Specify the second point", out secondX, out secondY, out secondZ))
            {
                //Create the first math point
                MathPoint dsFirstMathPoint = dsMathUtility.CreatePoint(firstX, firstY, firstZ);

                //Create the second math point
                MathPoint dsSecondMathPoint = dsMathUtility.CreatePoint(secondX, secondY, secondZ);

                //Get distance between points
                MathPoint dsResultPoint1, dsResultPoint2;
                double distance = dsMathUtility.Distance(dsFirstMathPoint, dsSecondMathPoint,
                                                         out dsResultPoint1, out dsResultPoint2);

                //Get result point coordinates
                dsResultPoint1.GetPosition(out firstX, out firstY, out firstZ);
                dsResultPoint2.GetPosition(out secondX, out secondY, out secondZ);

                string message = string.Format("The distance between ({0},{1},{2}) and ({3},{4},{5}) point is {6}.\n",
                                               firstX, firstY, firstZ, secondX, secondY, secondZ, distance);
                dsCommandMessage.PrintLine(message);
            }
        }
    }
}