New custom snapping with RhinoCommon

Hi Scripting Guru.

I’m trying to create a RhinoCommon script for snapping to the highest points in a cluster of points. I’m at loss for word trying to fix this error for the past week. I even used ChatGPT to diagnose these 2 persistent errors. So far no dice. Any advice? Thanks in advance!

CS0019 'Operator ‘==’ cannot be applied to operands of type ‘method group’ and ‘int’
CS8602 Dereference of a possibly null reference.

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

public class DynamicSnapCommand : Command
{
    public override string EnglishName => "DynamicSnapCommand";

    // To track if the command is running or not
    private bool _isRunning;

    protected override Result RunCommand(RhinoDoc doc, RunMode mode)
    {
        // Define the snap radius (100mm)
        double snapRadius = 100.0;

        // Start running the dynamic snap
        _isRunning = true;
        RhinoApp.WriteLine("Dynamic snapping is now active. Press ESC to stop.");

        // Event-based method is better than continuous loops
        while (_isRunning)
        {
            // Track mouse movement and snap logic
            var activeView = doc.Views.ActiveView;

            // Check if the active view and viewport are not null
            if (activeView == null || activeView.ActiveViewport == null)
            {
                RhinoApp.WriteLine("No active view or viewport.");
                return Result.Failure;
            }

            // Use GetPoint to track user input (mouse position)
            var gp = new GetPoint();
            gp.SetCommandPrompt("Select point for snapping");

            gp.Get(); // This ensures we capture the mouse position or user input

            // Check if the user canceled or accepted the command
            if (gp.CommandResult() != Result.Success)  // Ensure you're calling the method (gp.CommandResult())
            {
                RhinoApp.WriteLine("Failed to get point.");
                return Result.Failure;
            }

            var mousePos = gp.Point(); // This is the point selected by the user (mouse position)

            // Retrieve the points in the model space
            var pointObjs = doc.Objects.FindByObjectType(ObjectType.Point);
            if (pointObjs == null || pointObjs.Count == 0)
            {
                RhinoApp.WriteLine("No points found in the model space.");
                return Result.Failure;
            }

            // Find the highest point within 100mm radius
            Point3d? snapPoint = null;
            double maxZ = double.MinValue;

            foreach (var pointObj in pointObjs)
            {
                var point = pointObj.Geometry as Point;
                if (point == null) continue;

                double distance = point.Location.DistanceTo(mousePos);
                if (distance <= snapRadius)
                {
                    if (point.Location.Z > maxZ)
                    {
                        maxZ = point.Location.Z;
                        snapPoint = point.Location; // Store the highest Z within range
                    }
                }
            }

            // If a valid snap point is found, display the result
            if (snapPoint.HasValue)  // Correctly check if snapPoint has a value
            {
                RhinoApp.WriteLine($"Snapping to the highest point at {snapPoint.Value}");
            }
            else
            {
                RhinoApp.WriteLine("No valid snap points found within the defined radius.");
            }

            // Check for user input or stop conditions (ESC key press)
            if (gp.CommandResult() == Result.Cancel)  // Ensure you're calling the method (gp.CommandResult())
            {
                _isRunning = false;
                RhinoApp.WriteLine("Dynamic snapping stopped.");
            }

            // Allow Rhino to update its UI (this is equivalent to allowing the program to update the screen during a loop)
            RhinoApp.Wait();
        }

        return Result.Success;
    }
}

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