[[TranslatedPages]]

= Main view in JOSM =

This is the main view in JOSM (called [https://en.wikipedia.org/wiki/Viewport Viewport] by experts), where editing takes place, and Bing/Mapbox and other sources can be displayed.

[[Image(MapView2.png,500,nolink)]]

=== What do you see here and when ===

There several mechanisms in JOSM that affect what user sees in main view.

==== Visibility ====

* Data can be ''filtered out'' by [[Help/Dialog/Filter|Filters]]
* [[Help/Dialog/LayerList|Layers (data, imagery)]] can be [[Help/Dialog/LayerList#LayerButtons|hidden]] or can be set to [[Help/Dialog/LayerList#VisibilityLayer|semi-opaque]]
* Map Paint Styles can hide OSM objects per zoom level

==== Appearance ====

* '''Partial fill of objects''' is enabled by default, it '''depends on area of the object'''. Area will be fully filled if ''the partial fill would cover more than 50% of the area'' to avoid small unfilled gaps in the middle of an area.
* Enabled (in [[Help/Preferences/Map#MapPaintStyles|preferences]]) and activated (in [[Help/Dialog/MapPaint|Map Paint Styles window]] or preferences) styles affect what you see on the screen
* Styles can be displayed differently based on zoom factor

=== Main view controls ===

==== Move map ====

The area can be moved by '''holding down''' the {{{right mouse button}}}, and '''dragging''' the mouse.

==== Zoom ====

* Using the scroll wheel
* {{{+}}} and {{{-}}} keys 
* [wiki:Help#Viewportcontrol many alternative ways].

== Downloaded area ==

Indicated by yellow reverse diagonals.

JOSM will limit your editing abilities outside of the area that you have downloaded, because it may lead to [[Help/Concepts/Conflict|conflict]] after upload.

== Troubleshooting ==
=== MacOS ===
On a Mac with a one-button mouse, simulate right-click by holding down {{{Ctrl}}} while clicking the button.

== See also ==
* '''[Action/Select Select Action]''' - help on selecting, moving, and rotating objects in the map view
* '''[wiki:Help/EditToolbar Modes]''' - overview of modes (frequently accessed tools) in JOSM
* [wiki:Help/StatusBar Status bar]
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