|MapGazer – Using transparency|
All MapGazer windows have a base map, the primary map for that window. The following can be overlaid on the base map:
These overlay types can have their transparency varied interactively by moving sliders in the Transparencies dialog. To open this, select the Map → Map transparencies menu item (also available from the map pop-up menu), or press the ‘t’ key. The settings are independent and apply to all views, and are saved when MapGazer is closed. The slider arrows also change transparencies at 5% intervals. Press Reset to reset all transparency settings to their default values.
Mark transparenciesIndividual marks can also have their transparency set, either by using the slider in the mark’s Properties dialog or moving the cursor over the mark (making it the active mark) and pressing the ‘+’ or ‘−’ keys (which increase or decrease the transparency of the mark in 5% intervals).
The transparency used to display a mark is the greater of its own transparency setting and the ‘master’ transparency setting described above; the master slider can therefore be used to hide all marks to allow a better view of the map alone. In the case of a Route Waypoint, the Route transparency similarly overrides the Waypoint’s transparency.
When a mark is saved to a GPX file its transparency is saved along with its colour and other properties.
To overlay a second map over the base map, select the Map → Add overlay map menu item. Overlaying maps lets you see (for example) how geological information relates to topographic, or see street map information along with topography. You can then vary the overlay map’s transparency using the Overlay map slider in Map → Map transparencies dialog, as described above, or by pressing the ‘+’ or ‘−’ keys when the cursor is over the map (these increase or decrease the transparency of the overlay map in 5% intervals).
You can try this for yourself by using the provided SampleMap as the base map and then adding the SampleGeology map as the overlay map.
An active overlay map can be changed using Map → Change overlay map or removed using Map → Remove overlay map. The overlay map options are also available from the map pop-up menu.
Please click here for an animation (13MB) of varying the transparency of a geological map overlaid over a topographical map. Below are two ‘stills’ from that animation.
|MapGazer and these web pages were written by Mike Cowlishaw; Please send me any corrections, suggestions, etc.|
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This page was last updated on 2017-12-31 by mfc.