Draw circle around cursor when getting a point

Ryan_Reptisa · October 15, 2022, 10:07pm

Hi! I came across this page the other day and decided to write my own version. I’m particularly stomped by this custom display:
6206e580-faa6-488a-8bbc-074b39e9a305_rw_1200

Looks like it’s displaying a circle projected onto a targeted surface before GetPoint() is executed.

I’m fairly green to Rhino Common (even greener when it comes to custom displays) and I’d like to know where I should start looking (which namespace / method / etc to use). It would also be great if anyone can point me to a similar problem in this forum. Thanks.

menno · October 16, 2022, 11:56am

You would need to use the GetPoint class, and implement something in its DynamicDraw event handler, see

menno · October 16, 2022, 11:59am

Some examples

github.com

mcneel/rhino-developer-samples/blob/3179a8386a64602ee670cc832c77c561d1b0944b/rhinocommon/snippets/cs/array-by-distance.cs

partial class Examples
{
  static double m_distance = 1;
  static Rhino.Geometry.Point3d m_point_start;
  public static Rhino.Commands.Result ArrayByDistance(Rhino.RhinoDoc doc)
  {
    Rhino.DocObjects.ObjRef objref;
    var rc = Rhino.Input.RhinoGet.GetOneObject("Select object", true, Rhino.DocObjects.ObjectType.AnyObject, out objref);
    if (rc != Rhino.Commands.Result.Success)
      return rc;

    rc = Rhino.Input.RhinoGet.GetPoint("Start point", false, out m_point_start);
    if (rc != Rhino.Commands.Result.Success)
      return rc;

    var obj = objref.Object();
    if (obj == null)
      return Rhino.Commands.Result.Failure;

    // create an instance of a GetPoint class and add a delegate

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github.com

mcneel/rhino-developer-samples/blob/3179a8386a64602ee670cc832c77c561d1b0944b/rhinocommon/cs/SampleCsCommands/SampleCsOrientPerpendicularToCurve.cs

using Rhino;
using Rhino.Commands;
using Rhino.DocObjects;
using Rhino.Display;
using Rhino.Input.Custom;
using Rhino.Geometry;

namespace SampleCsCommands
{
  public class SampleCsOrientPerpendicularToCurve : Command
  {
    /// <summary>
    /// Command name
    /// </summary>
    public override string EnglishName => "SampleCsOrientPerpendicularToCurve";

    /// <summary>
    /// Runs the command
    /// </summary>
    protected override Result RunCommand(RhinoDoc doc, RunMode mode)

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Ryan_Reptisa · October 16, 2022, 1:58pm

Thank you! I’ll take a look

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Draw circle around cursor when getting a point

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