Programm with Hearth

[angelo2449]

Hi guys,

I would like to write a program that uses Earth as a base.

I would like to be able to define points and extract the geographical coordinates (Lat, Lon).
Does anyone have an idea to get started?

Thank you.

[tsh73]

Load picture of a Earth in cylindrical projection
gisgeography.com/cylindrical-projection/
in a graphicbox
map X to Lat, Y to Lon.

[tenochtitlanuk]

Here's a quick demo- you need to copy the code to LB editor and the image

to the same folder..

Click on the map and see screen coordinates
Longitudes on screen go 68 to 227- you need to scale these to -180 to +180
Latitudes 362 to 95 represent -60 to 60 degrees.

   nomainwin

   WindowWidth  =1000
   WindowHeight = 550

   graphicbox #w.gb1, 4,   4, 939, 450
   textbox    #w.tb1, 4, 460, 100,  30

   open "World Map" for window as #w

   #w "trapclose quit"

   loadbmp "scr", "earthMap.bmp"

   #w.gb1 "down ; drawbmp scr 1 1"
   #w.gb1 "flush"
   #w.gb1 "when leftButtonDown tellMe"

   wait

   sub tellMe h$, x, y
       scan
       #w.tb1 str$( MouseX) +"  " +str$( MouseY)
   end sub

   sub quit h$
       close #w
       end
   end sub