A python script to calculate the minimum amount of pages needed to render one or more GPX tracks
Home Page: https://pypi.org/project/hikingmap/
License: GNU General Public License v3.0
Currently hikingmap can add waypoints on every n kilometers or miles, where n is an integer value. This should work with floating point values as well, to allow waypoints every 500 meter.
The track has been added to the tests, currently only in the testsuite branch.
Debug output of the runtests script is
calc_border_point: prev_coord is not inside page area!
prev_coord = 0.045005,36.552529
coord = 0.041981,36.554021
page area = detail map 5 (landscape): 0.07902,36.368927 - 0.233663,36.454339
Error while calculating permutation 0, track order = 0.115582,36.429966 // 0.033205,36.488041 // 0.261325,36.34589 // 0.308385,36.244406
I created my own track by combining several GPX tracks in 1 file:
I removed the overlap between the first and the second file and I made sure the second tracks starts where the first finishes, to make hikingmap combine all tracks to 1 single track. All tracks are separate trkseg tags in the GPX file.
But the result is that some parts are not rendered for no apparent reason. If overlap, scale or paper size parameters are modified, it works correctly.
As reported by @hspitzer in the comments on commit ef33f07:
I'm running the following command:
hikingmap --pagewidth 28.1 --pageheight 40.4 --pageoverlap 1 --overview --gpx render_osm/data/GPX_all.gpx -- hm_render_maperitive/hm_render_maperitive.py -d 300
Output and error traceback without my fix
Reading file render_osm/data/GPX_all.gpx
Found track HRP
=> new track 0
Found track GR10
=> new track 1
Found track GR11
=> new track 2
Generating waypoints for track 0: -1.773994,43.373254 - 3.129561,42.481879
Total track distance: 741.91 km
Generating waypoints for track 1: -1.77406,43.373138 - 3.129097,42.482052
Total track distance: 892.09 km
Generating waypoints for track 2: -1.792386,43.393209 - 3.321879,42.319296
Total track distance: 818.52 km
Too many tracks to calculate all track permutations
Traceback (most recent call last):
File "/Users/hannah.spitzer/opt/miniconda3/envs/hrp/bin/hikingmap", line 33, in <module>
sys.exit(load_entry_point('hikingmap', 'console_scripts', 'hikingmap')())
File "/Users/hannah.spitzer/projects/personal/render_osm/hikingmap/hikingmap/hikingmap.py", line 74, in main
trackfinder.calculate_pages(tracks)
File "/Users/hannah.spitzer/projects/personal/render_osm/hikingmap/hikingmap/trackfinder.py", line 80, in calculate_pages
prev_coord = self.__add_point(prev_coord, coord)
File "/Users/hannah.spitzer/projects/personal/render_osm/hikingmap/hikingmap/trackfinder.py", line 101, in __add_point
prev_coord = self.__add_next_point(prev_coord, coord)
File "/Users/hannah.spitzer/projects/personal/render_osm/hikingmap/hikingmap/trackfinder.py", line 137, in __add_next_point
self.__currentpage.add_next_point(border_coord)
File "/Users/hannah.spitzer/projects/personal/render_osm/hikingmap/hikingmap/page.py", line 133, in add_next_point
self.__add_point_to_track_area(coord)
File "/Users/hannah.spitzer/projects/personal/render_osm/hikingmap/hikingmap/page.py", line 99, in __add_point_to_track_area
if coord.lon < self.track_area.minlon:
AttributeError: 'NoneType' object has no attribute 'lon'
Removing temp file /var/folders/s9/0d6yy20d44v60qd0nfkjlqdd541mvv/T/hikingmap_temp_waypointsmue94igj.gpx
Hikingmap has a problem rendering all tracks correctly if a complex combination of tracks is given. An example is the GPX file for the GR 573, downloadable at http://www.grsentiers.org/GPX/GR573_Ed6_CW-20180913.gpx . Some parts of the track will not be rendered at all and some pages are generated with invalid sizes (which mapnik scales to A4 format).
A quick solution is to manually edit out the side tracks, the main track will render successful.
Currently the track on a given page is centered, either horizontally for landscape or vertically for portrait orientation. In some cases there are other tracks on the page, centering the track we're currently processing is not always the most optimal decision.
The page boundaries should be chosen so that:
Implementing this will replace the need to check all track permutations.
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