Change the color and size of a shape

To change the color of a shape, change the properties of the IShapeStyle object. To change the size of a shape, use the SetSizeAt method of the INode object. Please check Link for the colors that can be changed.

public void ChangeColorAndSize(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, exit the process 
c.App.Output.WriteLine("sample", "Diagram is not displayed"); 
return; 
} 

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

//Get the node style and change the color 
IShapeStyle style = node.Style; 
style.BackColor = "Red"; //Change the background color to the default value 
style.ForeColor = "#ffffff"; //Change the foreground color in code 

//Change the size of the node 
node.SetSizeAt(100, 100); 
} 

You can also change the size with System.Drawing.Size. To do this, use the SetSize method of the INode object.

public void SetSize(ICommandContext c, ICommandParams p) 
{ 
//Omitted 
//Change the size of the node 
System.Drawing.Size size = new System.Drawing.Size(200, 100); 
node.SetSize(size); 
}