Creating markers and polygons without using

MapWinGIS
1

Hey guys.

I wanted to know if it was possible to create shapes on the map, specifically markers and polygons without creating/opening a shapefile?

My program is going to be run under ‘less than ideal’ conditions as it is and I don’t really see the benefit of using a shapefile to store simple makers and polygons. Plus I want to save on speed, efficiency, and storage space.

I’m going to load my markers and polygons from a JSON file, so I got that covered, I just need to know if it’s possible to use markers/polygons layers without shapefiles?

This is my current code:

using AxMapWinGIS;
using MapWinGIS;
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Forms.Integration;
using System.Windows.Input;
using Point = MapWinGIS.Point;
using Shape = MapWinGIS.Shape;

namespace BlueSky.UserControls
{
	/// <summary>
	/// Interaction logic for Map.xaml
	/// </summary>
	public partial class Map : UserControl
	{
		private WindowsFormsHost formsHost;
		private AxMap map;

		public Map()
		{
			InitializeComponent();
		}

		public AxMap GetMap()
		{
			return map;
		}

		private void UserControl_Loaded(object sender, RoutedEventArgs e)
		{
			formsHost = new WindowsFormsHost();
			map = new AxMap();
			formsHost.Child = map;
			MapGrid.Children.Add(formsHost);

			map.Projection = tkMapProjection.PROJECTION_GOOGLE_MERCATOR;
			map.MapResizeBehavior = tkResizeBehavior.rbModern;
			map.CursorMode = tkCursorMode.cmPan;

			map.Tiles.UseCache[tkCacheType.Disk] = false;
			map.Tiles.DoCaching[tkCacheType.Disk] = false;

			//map.ShapeEditor.StartUnboundShape((MapWinGIS.ShpfileType)5);

			var providers = map.Tiles.Providers;
			var providerid = (int)tkTileProvider.ProviderCustom + 1002;

			providers.Add(providerid, "land", "http://localhost:8991/land/z{zoom}/{y}/{x}.jpg", tkTileProjection.SphericalMercator, 3, 15, "test");

			//MapControlLib.Tiles.ClearCache(tkCacheType.RAM);
			//map.Tiles.ClearCache(tkCacheType.Disk);
			map.Tiles.ProviderId = providerid;

			map.InertiaOnPanning = tkCustomState.csFalse; //inertia is cool but it doesnt work well for some reason (laggy) so i just disable it

			map.SendMouseUp = true;
			map.MouseUpEvent += Map_MouseUpEvent;
		}

		private void Map_MouseUpEvent(object sender, _DMapEvents_MouseUpEvent e)
		{
			if (e.button == 1)          // left button
			{
				Shape shp = new Shape();
				shp.Create(ShpfileType.SHP_POINT);
				Point pnt = new Point();
				double x = 0.0;
				double y = 0.0;
				map.PixelToProj(e.x, e.y, ref x, ref y);
				pnt.x = 32;
				pnt.y = 34;
				Console.WriteLine($"{x},{y}");
				int index = shp.numPoints;
				shp.InsertPoint(pnt, ref index);

				map.AddLayer(shp, true);
				map.Redraw();
			}
		}
	}
}

Forget to mention… the code above does not work and does not show the marker.

2

Hello @ZeroByter

You might consider using the Drawing layers. However, they have their limitations, particularly regarding custom rendering.

I would recommend using a Shapefile, but setting Volatile property = true. It is then drawn along with the drawing layers, without having to redraw all data layers, using Redraw2 with tkRedrawType.RedrawSkipDataLayers.

Hope that helps.

Regards,
Jerry.

3

I’ll look into it, thanks!

4

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