[josm-dev] pecision of mouseclick in josm - may be not jsom-specific

[Frederik Ramm]

Hi,

On 02/01/2011 03:34 PM, Marco Lechner - FOSSGIS e.V. wrote:
> I' m wondering how precisely it is possible to click an specific point
> in josm. I mean, by clicking with the mouse at a specific point to
> generate a node, what are the factors influencing my precision besides
> the actual zoom scale and my parkinsonism?

Besides these two, the precision will be influcenced by the resolution
of your monitor (because the mouse cursor position is reported in full
pixels) and by existing data and various configuration options (most
importantly, mappaint.node.snap-distance). The default for that is 10,
so clicking within 10 pixels of an existing node or way will actually
place your new node on the existing object.

As you correctly say, these 10 pixels may mean 10 metres or 1000
kilometres depending on your zoom level. I just clicked on Paris and a
node was placed in Karlsruhe (becuase I had only loaded some data in
Karlsruhe and was zoomed out that far...)

Bye
Frederik