Change the position of the shape

To change the position of a shape, use the SetLocationAt method of the INode object.

public void SetLocationAt(ICommandContext c, ICommandParams p) 
{ 
//Get the currently displayed diagram 
IDiagram diagram = c.App.Workspace.CurrentEditor as IDiagram; 
if (diagram == null) 
{ 
//If the diagram is not displayed, end the process 
c.App.Output.WriteLine("sample", "Diagram is not displayed."); 
return; 
} 

//Get the node displayed on the diagram 
INode node = diagram.Nodes.FirstOrDefault(); 
if (node ​​== null) 
{ 
//If the node is not displayed, end the process 
c.App.Output.WriteLine("sample", "Node is not displayed."); 
return; 
} 

//Specify the coordinates for the node and change the node position 
node.SetLocationAt(100, 100); 
} 

You can also specify coordinates using System.Drawing.Point. In that case, use the SetLocation method of the INode object.

public void SetLocation(ICommandContext c, ICommandParams p) 
{ 
//Omitted 
//Specify coordinates for the node and change the node's position 
System.Drawing.Point point = new System.Drawing.Point(100, 100); 
node.SetLocation(point); 
} 

This is a sample that aligns the currently displayed shapes to the left.

public void SetLocation(ICommandContext c, ICommandParams p) 
{ 
IDiagram diagram = c.App.Workspace.CurrentEditor as IDiagram; 
INodeCollection nodes = diagram.Nodes; 

//Get the X coordinate of the leftmost node in the editor 
double leftmostX = nodes.Select(n => n.LocationX).Min(); 

//Set the left coordinate of the node in the editor 
foreach(INode node in nodes) 
{ 
node.SetLocationAt(leftmostX, node.LocationY); 
} 
}