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New Post: Drawing on the map

March 24, 2013, 7:35 am
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I've got a map loaded into my program (using Visual C# 2010, and gMapControl). I can draw lines on the map (YAY). I'm using:
        private void gMapControl1_Paint(object sender, PaintEventArgs e)
        {
            e.Graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
            Pen fl = new Pen(Color.Red, 3.0f);
            e.Graphics.DrawLine(fl, x_start, y_start, xx, yy);
        }
Where x_start and y_start is the left mouseDown, and xx, yy is the current position, as below:
        private void gMapControl1_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                mouseDown = 1;
                Point pmousePos = new Point(e.X, e.Y);
                x_start = e.X;
                y_start = e.Y;
            }
        }
My problem is that when I pan the map, or zoom the map, my drawn lines stay in the same place on the screen; they're not "tied to the ground (map").

Any direction would be appreciated.
AW
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New Post: Drawing on the map

March 24, 2013, 7:54 am
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New Post: Drawing on the map

March 24, 2013, 9:13 am
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I appreciate the direction, but that only killed the battery on my cell.

Should I not be using my second sample above to get coordinates? Is this method only returning screen coordinates?
Or perhaps I should be feeding the method with "map coordinates"?
Should I not be using the gMapControl1_Paint method to "paint" lines between mouseDown's?
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New Post: Smooth WPF Zoom

March 24, 2013, 1:33 pm
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If it exists in the Windows Forms version, is it that complex? :|
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New Post: GMap Commercial License

March 24, 2013, 6:28 pm
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thanks for the reply.
Leaving the provider aside, can I use GMap (WPF) for commercial product?
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New Post: Overlaying cloud cover on map

March 24, 2013, 6:30 pm
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If GMapOverlay is not available in the GMap WPF library, how can I add the cloud overlay onto the map?
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New Post: Manipulating Polygon using GMap for WPF

March 24, 2013, 6:35 pm
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Thanks for the reply.

I will try out your method for moving of the polygon.

For point 3, its regarding to rotating the polygon (ie. rectangle). The angle is according to the map true north. I am trying to emulate something like powerpoint. when the mouse is at the corner and user clicks and drags on it, it will rotate in the direction of mouse move.
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New Post: Drawing on the map

March 25, 2013, 8:56 am
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It looks like I need to draw (or Paint) my line on an overlay, and then add the overlay to the map. It this correct?
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New Post: Drawing on the map

March 25, 2013, 9:13 am
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It looks like I need to draw (or Paint) my line on an overlay, and then add the overlay to the map. It this correct?
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New Post: GMap Commercial License

March 25, 2013, 12:12 pm
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New Post: Drawing on the map

March 25, 2013, 12:52 pm
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This is some of my code:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using GMap.NET.MapProviders;
using GMap.NET.WindowsForms;
using GMap.NET.WindowsForms.Markers;

namespace GMap_AW
{

    public partial class Form1 : Form
    {
        GMapControl MainMap = new GMapControl();
        GMapMarkerImage m = new GMapMarkerImage(new PointLatLng());
        GMapOverlay overlayOne;

        int dragging = 0;
        int mouseDown = 0;
        float x_start;
        float y_start;
        float x_end;
        float y_end;
        float xx;
Why am I getting this error ?
Error   1   The type or namespace name 'GMapMarkerImage' could not be found (are you missing a using directive or an assembly reference?)
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New Post: Drawing on the map

March 27, 2013, 7:13 am
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I realize now that I need to reference the screen coordinates relative to the map, and then redraw my lines on the screen after I pan or zoom.
To reference the screen I use:
      Double   lat = gMapControl1.FromLocalToLatLng(e.X, e.Y).Lat;
      Double   lng = gMapControl1.FromLocalToLatLng(e.X, e.Y).Lng;
After I pan or zoom I need to find out where the above coordinates are relative to the screen. The command is:
      Double   lng = gMapControl1.FromLatLngToLocal(PointLatLng Point);
But what is the proper syntax? Because the compiler doesn't like "PointLatLng Point".

Thanks
Aw
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New Post: Drawing on the map

March 27, 2013, 8:42 am
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"Point" is a structure of namespace System.Drawing, that's why the compiler is complaining...
Why don't you just use a GMapRoute as radioman already suggested?
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New Post: Drawing on the map

March 27, 2013, 9:34 am
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I've tried using:

GMapRoute m = new GMapRoute(new Point.LatLng());

But I get an error of:

Error 1 The type name 'LatLng' does not exist in the type 'System.Drawing.Point'

AW
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New Post: Drawing on the map

March 27, 2013, 9:38 am
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I'm sorry, but you should learn to program C# first...
        GMapRoute route = new GMapRoute(new List<PointLatLng>(), "test");
        //Add all your points here
        route.Points.Add(...
        yourOverlay.Routes.Add(route);
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New Post: Smooth zooming in WPF

March 27, 2013, 1:36 pm
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Lashas wrote:
If not all projections could solve position in same way, then it might be done in projection class, or it somehow be modified... I could try to do that, but I don't know the difference between projections :)
Have you found a solution for WPF smooth zooming?
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Reviewed: 1.6 - Power (Mar 28, 2013)

March 28, 2013, 6:48 am
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Rated 5 Stars (out of 5) - Amazing, awesome, and some more amazing!!! Thank you so much for this control!
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New Post: Contribution

March 29, 2013, 2:40 pm
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Hello,

I am integrating GMaps into commercial application. The library is really great.

Is there a way I can donate (money) ?

Also, I am intending to modify the library a bit to be suitable for LabView and create a simplified interface with some examples. Is it OK if I call it the same and publish it on ni.com ?
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New Post: Contribution

March 30, 2013, 12:46 am
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yes you can fork it, and donation link is at the bottom of the main page
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New Post: How to update marker position with only distance and bearing data?

March 30, 2013, 1:18 am
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Hi,
First of all, your library is amazing. Thank you very much for this. You helped a lot of people.

Let's get into my question. I want to simulate vehicle running as markers on the map.
I can do it if the new lat/lng position is given by setting new position of markers as you did in flight tracking or vehicle tracking. However, when I'm simulating vehicles, I don't have new lat/lng positions. I have only current position, distance to go and bearing.

Could you please suggest me how to set new lat/lng position from current position, distance to go and bearing?

Thank you very much.
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