Area, Length and Width of last object created
Accepted solution
Hi,
You may avoid using SendStringToexecute because it doesn't run synchronously.
You can define a 'Rectangle' Type with the properties and method you need.
Here's an example:
public class Rectangle { // constructor public Rectangle(Point3d p1, Point3d p2) { LowerLeft = new Point3d(Math.Min(p1.X, p2.X), Math.Min(p1.Y, p2.Y), 0.0); UpperRight = new Point3d(Math.Max(p1.X, p2.X), Math.Max(p1.Y, p2.Y), 0.0); Length = UpperRight.X - LowerLeft.X; Width = UpperRight.Y - LowerLeft.Y; Area = Length * Width; } // public read only properties public Point3d LowerLeft { get; private set; } public Point3d UpperRight { get; private set; } public double Length { get; private set; } public double Width { get; private set; } public double Area { get; private set; } public SelectionSet CrossingSelectionSet { get { return Select(true); } } public SelectionSet WindowSelectionSet { get { return Select(false); } } // public method, draws the rectangle in the current space. public void Draw() { Database db = HostApplicationServices.WorkingDatabase; using (Transaction tr = db.TransactionManager.StartTransaction()) { BlockTableRecord btr = (BlockTableRecord)tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite); using (Polyline pline = new Polyline()) { pline.AddVertexAt(0, new Point2d(LowerLeft.X, LowerLeft.Y), 0.0, 0.0, 0.0); pline.AddVertexAt(1, new Point2d(UpperRight.X, LowerLeft.Y), 0.0, 0.0, 0.0); pline.AddVertexAt(2, new Point2d(UpperRight.X, UpperRight.Y), 0.0, 0.0, 0.0); pline.AddVertexAt(3, new Point2d(LowerLeft.X, UpperRight.Y), 0.0, 0.0, 0.0); pline.Closed = true; btr.AppendEntity(pline); tr.AddNewlyCreatedDBObject(pline, true); } tr.Commit(); } } // public static method, creates a new instance of Rectangle if the user specifies two points public static Rectangle Create() { Editor ed = Application.DocumentManager.MdiActiveDocument.Editor; PromptPointResult ppr = ed.GetPoint("\nFirst corner: "); if (ppr.Status == PromptStatus.Cancel) return null; Point3d pt = ppr.Value; ppr = ed.GetCorner("\nSecond corner: ", pt); if (ppr.Status == PromptStatus.Cancel) return null; Matrix3d ucs = ed.CurrentUserCoordinateSystem; return new Rectangle(pt.TransformBy(ucs), ppr.Value.TransformBy(ucs)); } // private method, returns the selection set private SelectionSet Select(bool crossing) { Editor ed = AcAp.DocumentManager.MdiActiveDocument.Editor; Matrix3d wcs = ed.CurrentUserCoordinateSystem.Inverse(); return crossing ? ed.SelectCrossingWindow(LowerLeft.TransformBy(wcs), UpperRight.TransformBy(wcs)).Value : ed.SelectWindow(LowerLeft.TransformBy(wcs), UpperRight.TransformBy(wcs)).Value; } }
Then, using this type, you can prompt the user to draw a rectangle the same wat as the native AutoCAD Command, get the data you need (length, width and area), use the rectangle to get a selection set.
Here's a little example:
[CommandMethod("test")] public void test() { Editor ed = Application.DocumentManager.MdiActiveDocument.Editor; Rectangle rect = Rectangle.Create(); if (rect == null) return; SelectionSet ss = rect.WindowSelectionSet; ed.SetImpliedSelection(ss); rect.Draw(); ed.WriteMessage("\nLength = {0} Width = {1} Area = {2}", rect.Length, rect.Width, rect.Area); }
