[Sample app] - Visual GPS

[luke x3]

Minimalist Visual GPS tracking demo... very much a no-frills version =)

[Jorge Ramirez]

Very nice!

You could improve it with a google map image:

https://developers.google.com/maps/documentation/staticmaps/

That's an API that returns an image if you give it a center point and a size.

Good job!

[luke x3]

Ah thanks!
That sounds like a good idea too, I'm guessing the url would go into a createimage(url, xx, xx) call

I thought of using a swipe-style interface to switch between modes, so any/all suggestions are welcome

[Vish Seenarain]

Can you post the SPK please?

Thanks ,
vish

[Peter de Rooij]

Vish, if you create a new project and replace the code with the content of the .js file it will work.

[Steve Garman]

Here Vish, try this.

[Vish Seenarain]

No Peter, it doesn't work :(

[Peter de Rooij]

Have you tried Steve's SPK. That should work for sure

[Vish Seenarain]

Hey Steve, its not working...
Really need that sample. :(

[Vish Seenarain]

[Steve Garman]

Vish, it works here.

What are you expecting from it?

Did you notice that the first words in this thread are

[Vish Seenarain]

Steve it doesn't work for me... I just get a black screen. :p
Tried the debugger to see if it was running but in vain.. Its still black..

[Timo Octazid]

Hi,
Have your device gps?
If yes, try to go out, it works definitive. At the start the screen is black for some time.

By the way: Nice Example, Steve!

Many Greetings
Timo

[Steve Garman]

Timo, I can't take credit for the example.

I just made an spk from Luke's .js file because Vish was having trouble installing it.

I do agree though, it is a nice example.

[Vish Seenarain]

Okay thanks everyone. :)
So iT doesn't require an internet connection.

[Steve Garman]

No the GPS locator does not require an internet connection.

The network locator does require a connection of some sort.

This code may help you see the difference.

// measure from Charing Cross
var london = {"lat":51.5117, "long":-0.1275};
var gpsS="unknown", netS="unknown";
//Called when application is started.
function OnStart()
{
    //Create a layout with objects vertically centered.
    lay = app.CreateLayout( "linear", "VCenter,FillXY" );    

    //Create a text label and add it to layout.
    txt = app.CreateText( "Waiting...",-1,-1,"MultiLine" );
    lay.AddChild( txt );

    loc1 = app.CreateLocator("GPS");
    loc1.SetOnChange(gps);
    loc1.Start();
    loc2 = app.CreateLocator("network");
    loc2.SetOnChange(network);
    loc2.Start();
    
    //Add layout to app.    
    app.AddLayout( lay );
refresh();
}

function gps()
{
    var dist = loc1.GetDistanceTo(
       london.lat, london.long);
    dist = (dist / 1000).toFixed(2) +" km";
    gpsS = dist;
    refresh();
}

function network()
{
    var dist = loc2.GetDistanceTo(
       london.lat, london.long);
 app.ShowPopup(loc2.GetBearingTo(
     london.lat, london.long));
    dist = (dist / 1000).toFixed(2) +" km";
    netS = dist;
    refresh();
}

function refresh()
{
    var msg = "Straight line distances to London\nGPS:"+
     gpsS+"\nNetwork:"+netS
 
    txt.SetText(msg);
}

[Vish Seenarain]

Okay thanks :)

So i might be able to create an offline map?? :p

Vish

[Steve Garman]

You could produce a drawn representation of where you have travelled but if you want to relate that to a real-world map, you need to get your maps from somebody else.

That either means storing maps of everywhere you might go on your device or downloading them from the internet as you need them.

If you are intending to try to write something like a cut-down Satellite Navigation System, please be aware that it would be an enormous task (even for an experienced programmer)

Trying to restrict yourself to working offline would make it much more difficult still.

[Vish Seenarain]

Isn't it possible to download the map of a particular place like I live in Mauritius and would probably download that. And then navigate through that map (Offline mode).