kml export and gps interpolation bugfix

2007/3/29, Stéphane Pontier < shadow.wgmail.com">shadow.wgmail.com>:

Hi,

I finally found time to work again on the kmlexport. I use QDom and merge it
with gpssync plugin. It can now take a gpx file to create a track with the
pictures.

Next thing to implement is to give user the choice of the track and picture
style (color, width and elevation mode) but before going further, I wanted to
have your opinion on this plugin.

To create the track I had to add a lineString method to the GPSDataParser
class. The track created is time independent and cant be clicked. If I want
to be able to create a track which can be clicked (to get information about
to road taken between two picture for example) I have to create a new set of
points using time and localisation of each gpx point. I can add this
functionality to GPSDataParser class, but since it's more kml function
related than GPS data parsing, isn't it cleaner to create a new class
derivate from GPSDataParser to put all kml related method in ?

the diff file is here:
http://stpo.homelinux.org/data/gpssync-kmlexport.diff

the example file (for googleearth):
http://stpo.homelinux.org/data/kmltest/kmldocument.kml

the example file (for googlemaps):
http://stpo.homelinux.org/data/kmltest2/kmldocument.kml


When I checked the result on the map (see the examples) I was wondering why to
points where standing out of the track (img_5161_jpg.jpeg and
img_5168_jpg.jpeg). I found out that these two points where interpolated and
found out that the formula to interpolate points should be
point1 + (point2-point1) * (time3-time1)/(time2-time1)
instead of
point1 + (point2-point1) * (time2-time1)/(time3-time1)
after using the attached patch, the pictures where interpolated correctly and
get back to the track.