ortho

          
using Rhino;
using Rhino.ApplicationSettings;
using Rhino.Commands;
using Rhino.Input.Custom;

namespace examples_cs
{
  public class OrthoCommand : Command
  {
    public override string EnglishName
    {
      get { return "csOrtho"; }
    }

    protected override Result RunCommand(RhinoDoc doc, RunMode mode)
    {
      var gp = new GetPoint();
      gp.SetCommandPrompt("Start of line");
      gp.Get();
      if (gp.CommandResult() != Result.Success)
        return gp.CommandResult();
      var start_point = gp.Point();
  
      var original_ortho = ModelAidSettings.Ortho;
      if (!original_ortho)
        ModelAidSettings.Ortho = true;

      gp.SetCommandPrompt("End of line");
      gp.SetBasePoint(start_point, false);
      gp.DrawLineFromPoint(start_point, true);
      gp.Get();
      if (gp.CommandResult() != Result.Success)
        return gp.CommandResult();
      var end_point = gp.Point();

      if (ModelAidSettings.Ortho != original_ortho)
        ModelAidSettings.Ortho = original_ortho;

      doc.Objects.AddLine(start_point, end_point);
      doc.Views.Redraw();
      return Result.Success;
    }
  }
}