Android Question how to add navigiation marks on jpg or png ?

[zohar]

Hi

I'm trying to create a littlle app which can show my location on regular image file .
i have a paint of a map of a city and i want to be able to navigate on it instead with google maps .
how should i convert it to become a map ?

Thanks ,
Zohar

 

[Erel]

You can put a transparent panel over the view that holds the bitmap and then draw the navigation marks on the transparent panel.

 

[klaus]

You also need at least two reference points on the map to scale it.
The easiest would be having the coordinates of the top/left and bottom/right corners of the map allowing you to
calculate the coordinates for each pixel position.
If the two points are somewhere inside the map it's possible too, but a bit more complicated.

 

[zohar]

wow , thanks for the very quick response .
so basicly what i need is to get the real cordinate from real map , put it top/left and bottom/right corners of my image .
and then when i get a location from the gps i will chnage the position relative to the point on transparent panel .
the conversion from coordinates to pixel is done automaticly or i need to calculate it ?

Thanks again,
great community

Zohar

 

[DonManfred]

You need to do the calculation cause YOU are the one who know (or should know) which area in GPS-Data is wrapped in this image.