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color codes in atlas don't match the default palette

Atlas is an addon that lets FlightGear users display a real-time "moving-map" of their flight.

color codes in atlas don't match the default palette

Postby tempest766 » Sat Nov 15, 2014 11:40 pm

The color codes in atlas don't seem to match up with the ones in the default.pa palette file in the atlas directory. See the attached image...Oh well...I guess I cannot attach images here. SOL Kind of hard to show the problem if I can't attach the png image.

Anyway, I created a short python program that maps the elevation color codes onto a map legend panel and then compared them against the colors displayed on the atlas chart. Why the differences?

and yes, I'm mapping 4 eight bit unsigned values as rgba.

[img]???[/img] image isn't online...it's on my computer.
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Re: color codes in atlas don't match the default palette

Postby Gijs » Sun Nov 16, 2014 12:11 pm

Hi,

see this topic for a guide on how to post images to the forum viewtopic.php?f=19&t=8873

Cheers,
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Re: color codes in atlas don't match the default palette

Postby tempest766 » Sun Nov 16, 2014 4:52 pm

Thanks. I saw it previously, but for reasons I won't debate online, I don't use 3rd party image posting services, social media, et al.

problem exists, whether or not I can upload an image of it.

the map tiles don't have the same colors as the Colour E_ entries in the default.pa file; especially pronounced the closer you get to sea level.
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Re: color codes in atlas don't match the default palette

Postby tempest766 » Sun Nov 16, 2014 4:57 pm

Here's the code to verify the problem. Run it yourself.

Code: Select all
#! /bin/python

# program requires the qt-4.x and PyQt4 packages to build and run

from PyQt4.QtGui import *
from PyQt4.QtCore import *

import sys
import re

class MyLegend(QLabel):
    colors=[]

    def __init__(self,parent,pf):
        QLabel.__init__(self,parent)
        p="^Colour[ \t]+E_(\-?[0-9]+)[ \t]+"
        p=("%s([0-9]+\.[0-9]+)[ \t]+")%p
        p=("%s([0-9]+\.[0-9]+)[ \t]+")%p
        p=("%s([0-9]+\.[0-9]+)[ \t]+")%p
        p=("%s([0-9]+\.[0-9]+).*")%p
        pattern=re.compile(p)
        fp=open(pf,"r")
        for i in fp.readlines():
            results=pattern.match(i)
            if (results):
                self.colors.append(
                    (int(results.group(1)),
                    int(float(results.group(2))*255),
                    int(float(results.group(3))*255),
                    int(float(results.group(4))*255),
                    int(float(results.group(5))*255))
                    )
        fp.close()
        pixmap=QPixmap(150,len(self.colors)*30)
        ptr=QPainter(pixmap)
        y=0
        for i in self.colors:
            legend="%d + "%i[0]
            base=i[0]
            thecolor=QColor(i[1],i[2],i[3],i[4])    # create rgba color from entry in palette file
            ptr.fillRect(0,y,150,30,thecolor)
            y+=30
            ptr.drawText(20,y-10,legend)            # stick some legend text on it
        ptr.end()
        self.resize(pixmap.size())
        self.setPixmap(pixmap)
           


if (__name__=="__main__"):
    app=QApplication(sys.argv)
    wrapper=QMainWindow()
    mywin=MyLegend(wrapper,"/usr/share/flightgear/Atlas/Palettes/default.pa")
    wrapper.resize(mywin.size())
    wrapper.show()
    sys.exit(app.exec_())
Last edited by Johan G on Sun Nov 16, 2014 5:21 pm, edited 1 time in total.
Reason: Helpful [code] tags
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Re: color codes in atlas don't match the default palette

Postby tempest766 » Sun Nov 16, 2014 5:03 pm

well, I guess not, since the forum software didn't maintain indentation, which is pretty much a requirement for python. SOL
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Re: color codes in atlas don't match the default palette

Postby Johan G » Sun Nov 16, 2014 5:24 pm

I added code tags to you previous post.

Unfortunately the button for adding them is not too obvious, but given some thought it looks like a prompt and a cursor [>_ ]. :wink:
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Re: color codes in atlas don't match the default palette

Postby tempest766 » Sun Nov 16, 2014 11:42 pm

thanks for reformatting. python is pretty much useless if not formatted properly.
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Re: color codes in atlas don't match the default palette

Postby Johan G » Mon Nov 17, 2014 7:11 pm

You are most welcome. :D

Just of curiosity, what version of Python have you run it with? (Nope, I have not tested it.)
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Re: color codes in atlas don't match the default palette

Postby tempest766 » Tue Nov 18, 2014 12:22 am

Right now using 2.7.5 under fedora linux and can't justify python 3.x since the vast majority of available support libraries and bindings are for 2.x. Maps and cartography are kind of my thing (instruct land navigation and competitive orienteering) so the mismatched color schemes are a problem near to my heart.
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