PanGazer – overlays
PanGazer uses ‘status’ text fields to show camera settings, etc. (see the settings page). In addition, it can overlay data on the image that are directly related to the image itself rather than being simply numerical values.
You can toggle the display of all the overlay and status displays currently visible in a view using the Space Bar (for from the View or pop-up menus); this overrides individual settings.
Currently the following overlays are available (more details below):
If the bearing or horizon is not known you can set it, as described below.
Here is a view showing the Compass points and Tilt angles overlays (a view showing the grid is at the bottom of this page):
PanGazer lets you set where North is for any image. Once North is set, as detailed on the Setting North page, PanGazer can show the bearing of the cursor and can also overlay compass points (‘N’, ‘S’, ‘SW’, etc.) at the top of the view to help give a sense of direction – as shown in the screenshot above.
The overlaid compass points will move appropriately as you change viewpoint and zoom. You can turn them off or on by clicking the Settings → Overlays → Show compass points menu item.
Some images (such as those from 360° cameras) include a North setting; if these are not identified as True North PanGazer will still use them but add a ‘?’ to the bearing in status displays. In all cases you can override the image North by Setting North explicitly.
The view bearing is calculated at the position that the compass points are displayed (near the top of the view rather than at the centre point of the view). This is so the bearings remain static relative to the displayed image as the view is panned left or right.
The tilt of the image is the vertical angle (pitch) of the centre of the image relative to the horizon (positive is above the horizon) with a range from −90 through +90 degrees.
For spherical images the position of the horizon is fixed and is calculated from the geometry of the image (the bottom edge of the image is at −90 degrees).
For all other images (360° or not) the image may include tilt information (if not it is asssumed the image is not tilted), and in all cases you can set, edit, or delete the horizon position. As for setting North, there are two ways to set the horizon position:
The tilt overlay shows the tilt at the centre point of the view (not the point where the overlay is displayed) unless the Grid is being displayed, in which case the tilt overlay matches the grid lines.
You can turn the tilt angles overlay off or on by clicking the Settings → Overlays → Show tilt angles menu item.
The North line is only shown if North is set and and the North point (N) would be visible at the top of the screen. Turning on the North line by clicking the Settings → Overlays → Show North line menu item shows the North line (and the North point, if not already shown by the Compass points overlay).
The Horizon line is shown if the tilt of the image is known and the zero tilt angle would be shown at the left of the screen. Turning on the Horizon line by clicking the Settings → Overlays → Show Horizon line menu item shows the Horizon line (and the Zero Tilt angle, if not already shown by the Tilt angles overlay).
The grid is overlaid on spherical images at 15° intervals; this will be aligned to North (if known, see above) or otherwise is aligned with the centre of the image. In either case, 90° lines are shown in a red and others in a yellow (see below). Near the poles the grid lines are faded out so as not to obscure image detail. You can turn the grid overlay off or on by clicking the Settings → Overlays → Show grid menu item, or by pressing ‘Ctrl-g’.
Here is a view showing the Compass points, Tilt angles, and Grid overlays:
|PanGazer and these web pages were written by Mike Cowlishaw; Please send me any corrections, suggestions, etc.|
All content Copyright © Mike Cowlishaw,
2014–2022, except where marked otherwise. All rights reserved.
The pages here, and the PanGazer program, are for non-commercial
This page was last updated on 2022-11-24 by mfc.