Cursor position (Lat Long) output to UDP

[ertem]

Hi,

I would like to use OpenCPN as the front end of a project I am developing. Is there a native or plugin based way to capture the current cursor position (Lat, Long) and preferably also mouse events (click, down, scroll, etc) and have these output over UDP or serial? (Or even to a log file from where I can take it.)

I am a newbie in these forums, and trust me, I searched for the answer before asking.

Thank you...

PS: I absolutely love OpenCPN, have it in the office, home and on the boat (GrandBanks 36 Classic) laptop as backup to the Garmins. Thank you developers!

[stevead]

Yes, there are OpenCPN plugin API's that support your requirements. Refer to ocpn_plugin.h

#define WANTS_CURSOR_LATLON 0x00000002
.....
#define WANTS_MOUSE_EVENTS 0x00080000
.....
void SetCursorLatLon(double lat, double lon);
.....
bool MouseEventHook(wxMouseEvent &event);

Transmitting stuff via UDP is supported by either wxWidgets or OS specific API's.
This is an example of using wxWidgets API's to broadcast over UDP.

// wxWidgets UDP stuff for debug spew
wxDatagramSocket *debugSocket;
wxIPV4address addrLocal;
wxIPV4address addrPeer;
.....
// Initialize UDP socket for debug spew
addrLocal.Hostname();
addrPeer.Hostname("127.0.0.1");
addrPeer.Service(3002);
debugSocket = new wxDatagramSocket(addrLocal, wxSOCKET_NONE);
.....
if (!debugSocket->IsOk()) {
	wxLogMessage(_T("ERROR: failed to create UDP peer socket"));
}
.....
// Send JSON message for debugging
debugSocket->SendTo(addrPeer, message_body.data(), message_body.Length());
.....
// Clean up debug spew
debugSocket->Close();

None of this is rocket surgery.