Article	60000341
Type	HowTo
Product	Engine
Version	6
Date Added	12/6/2007
Submitted by	VectorDraw
Keywords

Subject

Select entities from a point (four methods)

Summary

Select entities that are in locked/unlocked layers from a single point.

Solution

In this howto we will use four methods to select entities that might be in locked or unlocked layers from a point that we get using getUserPoint() (this is pt) like :

            gPoint pt = vdScrollableControl1.BaseControl.ActiveDocument.ActionUtility.getUserPoint() as gPoint;

and for the Selection Set :

            vdSelection selectionSet = null;
            selectionSet = vdScrollableControl1.BaseControl.ActiveDocument.Selections.FindName(name);
            if (selectionSet == null)
            {
                selectionSet = vdScrollableControl1.BaseControl.ActiveDocument.Selections.Add(name);
            }
            gPoint p1 = m_ActiveDoc.World2PixelMatrix.Transform(pt as gPoint);

Method 1: Selection with RenderSelect.SelectingMode.SingleEntitiyPoint
This will get the top-most entity. If this entity is in a locked layer then the returned selectionSet will be empty

            
            // Selection with RenderSelect.SelectingMode.SingleEntitiyPoint
            gPoints points = new gPoints();
            selectSet.RemoveAll();
            points.Add(pt);
            selectSet.Select(RenderSelect.SelectingMode.SingleEntitiyPoint, points);

            if (selectSet.Count > 0)
            {
                foreach (vdFigure fig in selectSet)
                {
                    MessageBox.Show("Found figure with Handle " + fig.HandleId.ToString() + " in Layer: " + fig.Layer.Name + " which is locked: " + fig.Layer.Lock.ToString(), "[Select with SingleEntitiyPoint]");
                }
            }
            else
            {
                MessageBox.Show("No object selected","[Select with SingleEntitiyPoint]");
            }

Method 2: Selection with Selection with GetEntityFromPoint
This will get the top-most entity even if this entity is in a locked layer.

            // Selection with GetEntityFromPoint
            Point location1 = new Point((int)p1.x, (int)p1.y);
            vdFigure fig2 = m_ActiveDoc.ActiveLayOut.GetEntityFromPoint(location1, m_ActiveDoc.ActiveLayOut.Render.GlobalProperties.PickSize, false);
            if (fig2 != null)
            {
                MessageBox.Show("Found figure with Handle: " + fig2.HandleId.ToString() + " in Layer: " + fig2.Layer.Name + " which is locked: " + fig2.Layer.Lock.ToString(),"[Select with GetEntityFromPoint]" );
            }
            else
            {
                MessageBox.Show("No object selected", "[Select with GetEntityFromPoint]");
            }

Method 3: Selection with RenderSelect.SelectingMode.CrossingWindowRectangle and the cursor's PickSize
This will get all the entities in the current point+picksize but not entities at locked layers

            // Selection with RenderSelect.SelectingMode.CrossingWindowRectangle and the cursors PickSize
            selectSet.RemoveAll();
            gPoints points2 = new gPoints();
            int size = m_ActiveDoc.ActiveLayOut.Render.GlobalProperties.PickSize;
            Point location2 = new Point((int)p1.x-size/2, (int)p1.y-size/2);
            Point location3 = new Point((int)p1.x+size/2, (int)p1.y+size/2);
            points2.Add(m_ActiveDoc.ActiveLayOut.Render.Pixel2View(location2));
            points2.Add(m_ActiveDoc.ActiveLayOut.Render.Pixel2View(location3));
            
            selectSet.Select(RenderSelect.SelectingMode.CrossingWindowRectangle, points2);

            if (selectSet.Count > 0)
            {
                foreach (vdFigure fig in selectSet)
                {
                    MessageBox.Show("Found figure with Handle " + fig.HandleId.ToString() + " in Layer: " + fig.Layer.Name + " which is locked: " + fig.Layer.Lock.ToString(), "[Select with CrossingWindowRectangle & PickSize]");
                }
            }
            else
            {
                MessageBox.Show("No object selected", "[Select with CrossingWindowRectangle & PickSize]");
            }

Method 4: Selection with Selection using Select3D and the cursor's PickSize
This will get all the entities in the current point+picksize even entities in locked layers
Note: The Select3d method will not work with entities that have Handle property a number bigger than UInt (32bit unsigned integer).

            // Selection using Select3D and cursor's picksize
            Point location4 = new Point((int)p1.x , (int)p1.y );
            vdEntities ents = m_ActiveDoc.Select3d(location4, m_ActiveDoc.ActiveLayOut.Render.GlobalProperties.PickSize);
            if (ents.Count > 0)
            {
                foreach (vdFigure fig in ents)
                {
                    MessageBox.Show("Found figure with Handle " + fig.HandleId.ToString() + " in Layer: " + fig.Layer.Name + " which is locked: " + fig.Layer.Lock.ToString(), "[Select with Select3d & PickSize]");
                }
            }
            else
            {
                MessageBox.Show("No object selected", "[Select with Select3d & PickSize]");
            }