Drawing Rectangle Which Dynamically Updates View

[cosmarchy]

Hi,

I'm not entirely sure how to try and describe what I'm looking to do so hopefully this will make sense......

Is is possible for me to click on a point on the screen and then as I drag the cursor to another location have it draw a rectangle which dynamically adjusts it's length as I move the mouse. The point I first click will be the middle of the rectangles end line. A second click at another point completes the rectangle.

Is this possible?

Thanks

[_gile]

Hi,

This can be done using a Jig.

If I don't misunderstand what you're trying to do, here's an example.

using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.Runtime;
using static System.Math;

using AcAp = Autodesk.AutoCAD.ApplicationServices.Core.Application;

[assembly: CommandClass(typeof(RectangleJigSample.Commands))]

namespace RectangleJigSample
{
    public class Commands
    {
        double halfWidth = 100.0; // default value

        [CommandMethod("CMD")]
        public void Cmd()
        {
            var doc = AcAp.DocumentManager.MdiActiveDocument;
            var db = doc.Database;
            var ed = doc.Editor;

            var pointResult = ed.GetPoint("\nRectangle start point: ");
            if (pointResult.Status != PromptStatus.OK) return;

            var distOptions = new PromptDistanceOptions("\nRectangle half width: ");
            distOptions.AllowNegative = false;
            distOptions.AllowZero = false;
            distOptions.BasePoint = pointResult.Value;
            distOptions.UseBasePoint = true;
            distOptions.DefaultValue = halfWidth;
            distOptions.UseDefaultValue = true;
            var distResult = ed.GetDistance(distOptions);
            if (distResult.Status != PromptStatus.OK) return;

            var basePt = pointResult.Value.TransformBy(ed.CurrentUserCoordinateSystem);
            halfWidth = distResult.Value;

            using (var tr = db.TransactionManager.StartTransaction())
            using (var pline = new Polyline(4))
            {
                pline.AddVertexAt(0, Point2d.Origin, 0.0, 0.0, 0.0);
                pline.AddVertexAt(1, Point2d.Origin, 0.0, 0.0, 0.0);
                pline.AddVertexAt(2, Point2d.Origin, 0.0, 0.0, 0.0);
                pline.AddVertexAt(3, Point2d.Origin, 0.0, 0.0, 0.0);
                pline.Closed = true;
                var jig = new RectangleJig(pline, basePt, halfWidth);
                var result = ed.Drag(jig);
                if (result.Status == PromptStatus.OK)
                {
                    var curSpace = (BlockTableRecord)tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite);
                    curSpace.AppendEntity(pline);
                    tr.AddNewlyCreatedDBObject(pline, true);
                }
                tr.Commit();
            }
        }
    }

    class RectangleJig : EntityJig
    {
        Polyline pline;
        Point3d basePt, dragPt;
        Point2d start;
        double halfWidth;
        const double HALFPI = 0.5 * PI;

        public RectangleJig(Polyline pline, Point3d basePt, double halfWidth) : base(pline)
        {
            this.pline = pline;
            this.basePt = basePt;
            this.halfWidth = halfWidth;
            start = new Point2d(basePt.X, basePt.Y);
        }

        protected override SamplerStatus Sampler(JigPrompts prompts)
        {
            var msg = "\nRectangle end point: ";
            var options = new JigPromptPointOptions(msg);
            options.UserInputControls =
              (UserInputControls.Accept3dCoordinates);
            options.BasePoint = basePt;
            options.UseBasePoint = true;
            options.Cursor = CursorType.RubberBand;
            var result = prompts.AcquirePoint(options);
            if (dragPt.DistanceTo(result.Value) < Tolerance.Global.EqualPoint)
            {
                return SamplerStatus.NoChange;
            }
            else
            {
                dragPt = result.Value;
            }
            return SamplerStatus.OK;
        }

        protected override bool Update()
        {
            var angle = Vector3d.XAxis.GetAngleTo(basePt.GetVectorTo(dragPt), Vector3d.ZAxis);
            var end = new Point2d(dragPt.X, dragPt.Y);
            pline.SetPointAt(0, Polar(start, angle - HALFPI, halfWidth));
            pline.SetPointAt(1, Polar(end, angle - HALFPI, halfWidth));
            pline.SetPointAt(2, Polar(end, angle + HALFPI, halfWidth));
            pline.SetPointAt(3, Polar(start, angle + HALFPI, halfWidth));
            return true;
        }

        private Point2d Polar(Point2d pt, double angle, double dist)
        {
            return new Point2d(pt.X + dist * Cos(angle), pt.Y + dist * Sin(angle));
        }
    }
}

[cosmarchy]

Hi,

This can be done using a Jig.

If I don't misunderstand what you're trying to do, here's an example.

using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.Runtime;
using static System.Math;

using AcAp = Autodesk.AutoCAD.ApplicationServices.Core.Application;

[assembly: CommandClass(typeof(RectangleJigSample.Commands))]

namespace RectangleJigSample
{
    public class Commands
    {
        double halfWidth = 100.0; // default value

        [CommandMethod("CMD")]
        public void Cmd()
        {
            var doc = AcAp.DocumentManager.MdiActiveDocument;
            var db = doc.Database;
            var ed = doc.Editor;

            var pointResult = ed.GetPoint("\nRectangle start point: ");
            if (pointResult.Status != PromptStatus.OK) return;

            var distOptions = new PromptDistanceOptions("\nRectangle half width: ");
            distOptions.AllowNegative = false;
            distOptions.AllowZero = false;
            distOptions.BasePoint = pointResult.Value;
            distOptions.UseBasePoint = true;
            distOptions.DefaultValue = halfWidth;
            distOptions.UseDefaultValue = true;
            var distResult = ed.GetDistance(distOptions);
            if (distResult.Status != PromptStatus.OK) return;

            var basePt = pointResult.Value.TransformBy(ed.CurrentUserCoordinateSystem);
            halfWidth = distResult.Value;

            using (var tr = db.TransactionManager.StartTransaction())
            using (var pline = new Polyline(4))
            {
                pline.AddVertexAt(0, Point2d.Origin, 0.0, 0.0, 0.0);
                pline.AddVertexAt(1, Point2d.Origin, 0.0, 0.0, 0.0);
                pline.AddVertexAt(2, Point2d.Origin, 0.0, 0.0, 0.0);
                pline.AddVertexAt(3, Point2d.Origin, 0.0, 0.0, 0.0);
                pline.Closed = true;
                var jig = new RectangleJig(pline, basePt, halfWidth);
                var result = ed.Drag(jig);
                if (result.Status == PromptStatus.OK)
                {
                    var curSpace = (BlockTableRecord)tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite);
                    curSpace.AppendEntity(pline);
                    tr.AddNewlyCreatedDBObject(pline, true);
                }
                tr.Commit();
            }
        }
    }

    class RectangleJig : EntityJig
    {
        Polyline pline;
        Point3d basePt, dragPt;
        Point2d start;
        double halfWidth;
        const double HALFPI = 0.5 * PI;

        public RectangleJig(Polyline pline, Point3d basePt, double halfWidth) : base(pline)
        {
            this.pline = pline;
            this.basePt = basePt;
            this.halfWidth = halfWidth;
            start = new Point2d(basePt.X, basePt.Y);
        }

        protected override SamplerStatus Sampler(JigPrompts prompts)
        {
            var msg = "\nRectangle end point: ";
            var options = new JigPromptPointOptions(msg);
            options.UserInputControls =
              (UserInputControls.Accept3dCoordinates);
            options.BasePoint = basePt;
            options.UseBasePoint = true;
            options.Cursor = CursorType.RubberBand;
            var result = prompts.AcquirePoint(options);
            if (dragPt.DistanceTo(result.Value) < Tolerance.Global.EqualPoint)
            {
                return SamplerStatus.NoChange;
            }
            else
            {
                dragPt = result.Value;
            }
            return SamplerStatus.OK;
        }

        protected override bool Update()
        {
            var angle = Vector3d.XAxis.GetAngleTo(basePt.GetVectorTo(dragPt), Vector3d.ZAxis);
            var end = new Point2d(dragPt.X, dragPt.Y);
            pline.SetPointAt(0, Polar(start, angle - HALFPI, halfWidth));
            pline.SetPointAt(1, Polar(end, angle - HALFPI, halfWidth));
            pline.SetPointAt(2, Polar(end, angle + HALFPI, halfWidth));
            pline.SetPointAt(3, Polar(start, angle + HALFPI, halfWidth));
            return true;
        }

        private Point2d Polar(Point2d pt, double angle, double dist)
        {
            return new Point2d(pt.X + dist * Cos(angle), pt.Y + dist * Sin(angle));
        }
    }
}

Many, many thanks for this _gile.

I am getting an error here

var doc = AcAp.DocumentManager.MdiActiveDocument;

where VisualStudio is complaining that AcAp is inaccessible due to it's protection level.

Any idea what that might be?

[cosmarchy]

Many, many thanks for this _gile.

I am getting an error here

var doc = AcAp.DocumentManager.MdiActiveDocument;

where VisualStudio is complaining that AcAp is inaccessible due to it's protection level.

Any idea what that might be?

Sussed, it. Problem was with me not copying everything as I should have (missed a line out )

Now to see if I can get it to work

[cosmarchy]

Horray, I've got it working.

It's not quite what I was looking for, but I have to say a big thanks to _gile for his time and effort getting me where I currently am.

I need to make, what I believe, is a minor tweak but first I have to understand what is going on. When I click F1 in visualstudio when the cursor is on a keyword, I get a visualstudio webpage - I was expecting to get help files.

Does anyone know where I can get the developers reference and integrate it into visualstudio? Is this possible?

Thanks