Fillet and Stretch Sketch Entities 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 and open a new drawing.
// 6. Run the macro.
//
//Postconditions:
//1. Two sets of sketch entities are created.
//2. One set of sketch entities is filleted.
//3. The other set of sketch entities is stretched.
//----------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.Text;
using DraftSight;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace ModifyEntities
{
    class Program
    {
        private static DraftSight.Application dsApp;
        private static DraftSight.Document dsDoc;

        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
            dsDoc = dsApp.GetActiveDocument();
            if (null == dsDoc)
            {
                MessageBox.Show("There are no opened documents in DraftSight.");
                return;
            }

            //Get model space
            Model dsModel = dsDoc.GetModel();

            //Get sketch manager
            SketchManager dsSketchMgr = dsModel.GetSketchManager();

            //Fillet entities
            FilletEntities(dsSketchMgr);

            //Stretch entities
            StretchEntities(dsSketchMgr);
        }

        private static void StretchEntities(SketchManager dsSketchMgr)
        {
            //Stretch parameters
            double displacementX = 4;
            double displacementY = 6;
            double displacementZ = 0;
            DispatchWrapper[] dsEntities;
            double[] crossingBoxStartCorner;
            double[] crossingBoxEndCorner;

            //Prepare entities for stretch
            DrawEntitiesForStretch(dsSketchMgr, out dsEntities, out crossingBoxStartCorner, out crossingBoxEndCorner);

            //Zoom extents
            dsApp.Zoom(dsZoomRange_e.dsZoomRange_Fit, null, null);

            MessageBox.Show("Entities before STRETCH.");

            //Stretch entities
            dsSketchMgr.StretchEntities(displacementX, displacementY, displacementZ, dsEntities,
                                        crossingBoxStartCorner, crossingBoxEndCorner);

            //Zoom extents
            dsApp.Zoom(dsZoomRange_e.dsZoomRange_Fit, null, null);

            MessageBox.Show("Entities after STRETCH.");
        }

        private static void DrawEntitiesForStretch(SketchManager dsSketchMgr, out DispatchWrapper[] dsEntities,
                                                   out double[] crossingBoxStartCorner, out double[] crossingBoxEndCorner)
        {
            //Initialize output entities array
            int entitiesIndex = 0;
            int entitiesCount = 3;
            dsEntities = new DispatchWrapper[entitiesCount];

            //Draw polyline
            bool closed = true;
            double[] coordinates = { 1, 1, 3, 1, 3, 3, 1, 3 };
            PolyLine dsPolyline = dsSketchMgr.InsertPolyline2D(coordinates, closed);

            //Add polyline to output array of entities
            dsEntities[entitiesIndex++] = new DispatchWrapper(dsPolyline);

            //Draw line
            double[] startPoint = { 4, 1, 0 };
            double[] endPoint = { 4, 5, 0 };
            Line dsLine = dsSketchMgr.InsertLine(startPoint[0], startPoint[1], startPoint[2],
                                                 endPoint[0], endPoint[1], endPoint[2]);

            //Add line to output array of entities
            dsEntities[entitiesIndex++] = new DispatchWrapper(dsLine);

            //Draw circle
            double radius = 1;
            double[] centerPoint = { 6, 2, 0 };
            Circle dsCircle = dsSketchMgr.InsertCircle(centerPoint[0], centerPoint[1], centerPoint[2], radius);

            //Add circle to output array of entities
            dsEntities[entitiesIndex++] = new DispatchWrapper(dsCircle);

            //Specify crossing coordinates
            crossingBoxStartCorner = new double[] { 0.6, 2, 0 };
            crossingBoxEndCorner = new double[] { 8, 6, 0 };
        }

        private static void FilletEntities(SketchManager dsSketchMgr)
        {
            double[] firstPointOnEntityDblArray;
            DispatchWrapper[] firstEntityArray;
            double[] secondPointOnEntityDblArray;
            DispatchWrapper[] secondEntityArray;

            //Prepare entities for fillet
            DrawEntitiesForFillet(dsSketchMgr, out firstPointOnEntityDblArray, out firstEntityArray,
                                  out secondPointOnEntityDblArray, out secondEntityArray);

            //Zoom extents
            dsApp.Zoom(dsZoomRange_e.dsZoomRange_Fit, null, null);

            MessageBox.Show("Entities before FILLET.");

            //Set fillet radius
            double filletRadius = 1.5;
            SetFilletRadius(dsDoc, filletRadius);

            //Do fillet entities
            dsSketchMgr.FilletEntities(firstPointOnEntityDblArray, firstEntityArray,
                                       secondPointOnEntityDblArray, secondEntityArray);

            //Zoom extents
            dsApp.Zoom(dsZoomRange_e.dsZoomRange_Fit, null, null);

            MessageBox.Show("Entities after FILLET.");
        }

        private static void DrawEntitiesForFillet(SketchManager dsSketchMgr, out double[] firstPointOnEntityDblArray, out DispatchWrapper[] firstEntityArray, out double[] secondPointOnEntityDblArray, out DispatchWrapper[] secondEntityArray)
        {
            //Count of entity pairs to fillet
            int count = 3;

            //Initialize output arrays
            firstPointOnEntityDblArray = new double[count*3];
            firstEntityArray = new DispatchWrapper[count];
            secondPointOnEntityDblArray = new double[count*3];
            secondEntityArray = new DispatchWrapper[count];
            int entityIndex = 0;
            int coordinateIndex = 0;

            //--------Draw the first pair of entities to fillet-----------------------

            //Draw a line
            double[] startPoint = { 0, 0, 0 };
            double[] endPoint = { 5, 0, 0 };
            Line dsLine = dsSketchMgr.InsertLine(startPoint[0], startPoint[1], startPoint[2],
                                                 endPoint[0], endPoint[1], endPoint[2]);

            //Add line entity to output arrays
            firstEntityArray[entityIndex] = new DispatchWrapper(dsLine);
            firstPointOnEntityDblArray[coordinateIndex] = endPoint[0];
            firstPointOnEntityDblArray[coordinateIndex +1] = endPoint[1];
            firstPointOnEntityDblArray[coordinateIndex+ 2] = endPoint[2];

            //Draw an arc
            double radius = 1;
            double[] centerPoint = { 2, -1, 0 };
            double startAngle = Math.PI;
            double endAngle = 1.5 * Math.PI;
            CircleArc dsArc = dsSketchMgr.InsertArc(centerPoint[0], centerPoint[1], centerPoint[2],
                                                    radius, startAngle, endAngle);

            //Add arc entity to output arrays
            secondEntityArray[entityIndex] = new DispatchWrapper(dsArc);
            secondPointOnEntityDblArray[coordinateIndex] = centerPoint[0] - radius;
            secondPointOnEntityDblArray[coordinateIndex + 1] = centerPoint[1];
            secondPointOnEntityDblArray[coordinateIndex + 2] = centerPoint[2];

            //Increase entity index
            entityIndex++;
            //Increase coordinate index
            coordinateIndex += 3;

            //--------Draw the second pair of entities to fillet----------------------

            //Draw a line
            startPoint = new double[] { 11, 0, 0 };
            endPoint = new double[] { 16, 0, 0 };
            dsLine = dsSketchMgr.InsertLine(startPoint[0], startPoint[1], startPoint[2],
                                            endPoint[0], endPoint[1], endPoint[2]);

            //Add line entity to output arrays
            firstEntityArray[entityIndex] = new DispatchWrapper(dsLine);
            firstPointOnEntityDblArray[coordinateIndex] = endPoint[0];
            firstPointOnEntityDblArray[coordinateIndex + 1] = endPoint[1];
            firstPointOnEntityDblArray[coordinateIndex + 2] = endPoint[2];

            //Draw a circle
            centerPoint = new double[] { 18, -1, 0 };
            radius = 1;
            Circle dsCircle = dsSketchMgr.InsertCircle(centerPoint[0], centerPoint[1], centerPoint[2], radius);

            //Add circle entity to output arrays
            secondEntityArray[entityIndex] = new DispatchWrapper(dsCircle);
            secondPointOnEntityDblArray[coordinateIndex] = centerPoint[0] - radius;
            secondPointOnEntityDblArray[coordinateIndex + 1] = centerPoint[1];
            secondPointOnEntityDblArray[coordinateIndex + 2] = centerPoint[2];

            //Increase entity index
            entityIndex++;
            //Increase coordinate index
            coordinateIndex += 3;

            //--------Draw the third pair of entities to fillet-----------------------

            //Draw first circle
            centerPoint = new double[] { 7, -1, 0 };
            radius = 1;
            Circle dsFirstCircle = dsSketchMgr.InsertCircle(centerPoint[0], centerPoint[1], centerPoint[2], radius);

            //Add circle entity to output arrays
            firstEntityArray[entityIndex] = new DispatchWrapper(dsFirstCircle);
            firstPointOnEntityDblArray[coordinateIndex] = centerPoint[0];
            firstPointOnEntityDblArray[coordinateIndex + 1] = centerPoint[1] + radius;
            firstPointOnEntityDblArray[coordinateIndex + 2] = centerPoint[2];

            //Draw second circle
            centerPoint[0] = 9;
            Circle dsSecondCircle = dsSketchMgr.InsertCircle(centerPoint[0], centerPoint[1], centerPoint[2], radius);

            //Add circle entity to output arrays
            secondEntityArray[entityIndex] = new DispatchWrapper(dsSecondCircle);
            secondPointOnEntityDblArray[coordinateIndex] = centerPoint[0];
            secondPointOnEntityDblArray[coordinateIndex + 1] = centerPoint[1] + radius;
            secondPointOnEntityDblArray[coordinateIndex + 2] = centerPoint[2];
        }

        private static void SetFilletRadius(Document dsDoc, double filletRadius)
        {
            dsSetCommandOptionResult_e setResult;
            dsCommandOptionDouble_e filletRadCommandOption = dsCommandOptionDouble_e.dsCommandOptionDouble_SetFltRad;

            dsDoc.SetCommandOptionDouble(filletRadCommandOption, filletRadius, out setResult);
            if (dsSetCommandOptionResult_e.dsSetCommandOptionResult_Success != setResult)
            {
                MessageBox.Show("Document.SetCommandOptionDouble() returns " + setResult.ToString() + " after setting of " + filletRadCommandOption + " command option.");
            }
        }

        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;
        }
    }
}