Constrain Sketch Example (C#)

//----------------------------------------------------------------------------
// Preconditions: Open a document with a sketch similar to "Before constraining
//                the sketch".
//
// Postconditions: Sketch is fully constrained and looks
//                 similar to "After constraining the sketch".
//----------------------------------------------------------------------------
using Microsoft.VisualBasic;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
using SolidWorks.Interop.sldworks;
using SolidWorks.Interop.swconst;
using System.Runtime.InteropServices;
using System.Windows.Forms;
namespace ConstrainSketch_CSharp.csproj
{
    partial class SolidWorksMacro
    {

        ModelDoc2 swModel;
        SketchManager swSketchMgr;
        Sketch swSketch;
        SelectionMgr swSelMgr;
        Feature swFeat;
        long nSketchStatus;
        bool boolstatus;

        public void Main()
        {
            swModel = (ModelDoc2)swApp.ActiveDoc;

            // Is a model document active?

            if (swModel == null)
            {
                swApp.SendMsgToUser2("A part document must be open and the active document.", (int)swMessageBoxIcon_e.swMbWarning, (int)swMessageBoxBtn_e.swMbOk);
                return;

            }

            // Is it a part document?
            long modelType = 0;
            modelType = swModel.GetType();

            if (modelType != (int)swDocumentTypes_e.swDocPART)
            {
                swApp.SendMsgToUser2("A part document must be open and the active document.", (int)swMessageBoxIcon_e.swMbWarning, (int)swMessageBoxBtn_e.swMbOk);
                return;

            }

            swSketchMgr = swModel.SketchManager;
            swSketch = swSketchMgr.ActiveSketch;

            if (swSketch == null)
            {
                swApp.SendMsgToUser2("No active sketch; thus, a sketch could not be selected.", (int)swMessageBoxIcon_e.swMbWarning, (int)swMessageBoxBtn_e.swMbOk);
                return;

            }

            // Select the lines and make them colinear and vertical
            boolstatus = swModel.Extension.SelectByID2("Line2", "SKETCHSEGMENT", 0.02116924482339, 0.04904427527406, 0, false, 0, null, 0);
            boolstatus = swModel.Extension.SelectByID2("Line3", "SKETCHSEGMENT", 0.06508556638246, 0.02563976857491, 0, true, 0, null, 0);

            swModel.SketchAddConstraints("sgCOLINEAR");
            swModel.SketchAddConstraints("sgVERTICAL2D");

            MessageBox.Show("The lines have been selected, made colinear, and vertically constrained.");
            swModel.ClearSelection2(true);

            //Select the center of the circles and constrain them to the origin
            boolstatus = swModel.Extension.SelectByID2("Point7", "SKETCHPOINT", 0.1074240560292, 0.006179841656516, 0, false, 0, null, 0);
            boolstatus = swModel.Extension.SelectByID2("Point1@Origin", "EXTSKETCHPOINT", 0, 0, 0, true, 0, null, 0);

            swModel.SketchAddConstraints("sgCOINCIDENT");
            MessageBox.Show("The center of the circles and the origin were selected and made coincident");
            swModel.ClearSelection2(true);

            // Select a line and the circle and make them tangent
            boolstatus = swModel.Extension.SelectByID2("Line2", "SKETCHSEGMENT", 0.005390925700365, 0.009861449451888, 0, false, 0, null, 0);
            boolstatus = swModel.Extension.SelectByID2("Arc1", "SKETCHSEGMENT", -0.01222819732034, 0.04720347137637, 0, true, 0, null, 0);

            swModel.SketchAddConstraints("sgTANGENT");
            MessageBox.Show("One line and a cirle were selected; both lines are now tangent with the circle.");
            swModel.ClearSelection2(true);

            //Select the circles and make them concentric
            boolstatus = swModel.Extension.SelectByID2("Arc2", "SKETCHSEGMENT", -0.0290584043849, 0.03116218026797, 0, false, 0, null, 0);
            boolstatus = swModel.Extension.SelectByID2("Arc1", "SKETCHSEGMENT", -0.01222819732034, 0.04720347137637, 0, true, 0, null, 0);

            swModel.SketchAddConstraints("sgCONCENTRIC");
            MessageBox.Show("The circles have been selected and made concentric.");
            swModel.ClearSelection2(true);

            //Select all the sketch entities and fix their positions
            MessageBox.Show("All  sketch entities will be selected and made fixed to fully constrain the sketch.");
            boolstatus = swModel.Extension.SelectByID2("Line2", "SKETCHSEGMENT", 0.02116924482339, 0.04904427527406, 0, false, 0, null, 0);
            boolstatus = swModel.Extension.SelectByID2("Line3", "SKETCHSEGMENT", 0.06508556638246, 0.02563976857491, 0, true, 0, null, 0);
            boolstatus = swModel.Extension.SelectByID2("Arc2", "SKETCHSEGMENT", -0.0290584043849, 0.03116218026797, 0, false, 0, null, 0);
            boolstatus = swModel.Extension.SelectByID2("Arc1", "SKETCHSEGMENT", -0.01222819732034, 0.04720347137637, 0, true, 0, null, 0);

            swModel.SketchAddConstraints("sgFIXED");
            swModel.ClearSelection2(true);

        }

        public SldWorks swApp;

    }

}