Drawing

This GeoBlazor sample, written in Blazor for .NET developers, demonstrates how to build and edit Point, Polyline, and Polygon geometries through GeoBlazor's Graphic, Point, Polyline, Polygon, and GraphicsLayer Razor components, all built on the ArcGIS Maps SDK for JavaScript Graphic API. Above the map are three collapsible Accordion sections (Draw a Point, Draw a Polyline, Draw a Polygon). The Point section has paired longitude and latitude number inputs and a Draw / Remove button that adds or removes a purple SimpleMarkerSymbol on the GraphicsLayer; editing either coordinate calls SetGeometry to move the point live. The Polyline section displays a table of vertex rows (longitude, latitude) plus Add Pt and Remove Pt buttons that grow or shrink the polyline; the Draw button toggles a white polyline graphic. The Polygon section works the same way for a translucent purple polygon and attaches a PopupTemplate so clicking the polygon shows a Congratulations message. Below the map (a 2D Imagery with Labels basemap centered over the Santa Monica Mountains) sits a row of Get Point Data, Get Polyline Data, and Get Polygon Data buttons that serialize the current Graphic geometry to JSON and render it underneath. The sample is intended to demonstrate two-way binding between C# state and live map geometry in a Blazor application without writing JavaScript.