| 23 |
<holder>Intevation GmbH</holder> |
<holder>Intevation GmbH</holder> |
| 24 |
</copyright> |
</copyright> |
| 25 |
<revhistory> |
<revhistory> |
| 26 |
|
<!-- comment this first revision out when releasing a real version --> |
| 27 |
|
<!-- |
| 28 |
|
<revision> |
| 29 |
|
<revnumber>CVS version $Id$</revnumber> |
| 30 |
|
<date></date> |
| 31 |
|
<revremark>Under development.</revremark> |
| 32 |
|
</revision> |
| 33 |
|
--> |
| 34 |
|
<revision> |
| 35 |
|
<revnumber>1.0pre2</revnumber> |
| 36 |
|
<date>29-Aug-2003</date> |
| 37 |
|
<revremark> |
| 38 |
|
Corresponds to Thuban development release 0.8.1. |
| 39 |
|
New: chapter on extensions. |
| 40 |
|
</revremark> |
| 41 |
|
</revision> |
| 42 |
<revision> |
<revision> |
| 43 |
<revnumber>1.0pre1</revnumber> |
<revnumber>1.0pre1</revnumber> |
| 44 |
<date>08-Aug-2003</date> |
<date>08-Aug-2003</date> |
| 45 |
<revremark>Corresponds to Thuban development release 0.8.1</revremark> |
<revremark>Corresponds to Thuban development release 0.8.1.</revremark> |
| 46 |
</revision> |
</revision> |
| 47 |
</revhistory> |
</revhistory> |
| 48 |
|
|
| 95 |
full installation packages for Debian, Windows and RPM-based systems |
full installation packages for Debian, Windows and RPM-based systems |
| 96 |
(Mandrake, RedHat, SuSE, etc). |
(Mandrake, RedHat, SuSE, etc). |
| 97 |
</para> |
</para> |
| 98 |
|
<section><title>RPM-based GNU/Linux Systems</title> |
| 99 |
|
<section><title>Installing Binary Packages</title> |
| 100 |
|
<para> |
| 101 |
|
The most wide-spread RPM-based GNU/Linux Systems are RedHat, |
| 102 |
|
Mandrake and SuSE. The documentation of these distributions |
| 103 |
|
should contain information about how to install third-party |
| 104 |
|
RPM packages. Nonetheless, a short summary is provided here. |
| 105 |
|
</para> |
| 106 |
|
<para> |
| 107 |
|
RPM packages can be installed applying several tools. |
| 108 |
|
The most basic one is the command line program "rpm". |
| 109 |
|
The hardware architecture is identified in the name |
| 110 |
|
of RPM packages, eg. 'i386' for most Intel/AMD architectures. |
| 111 |
|
If you have a different hardware architecture, where no |
| 112 |
|
binary RPM packages are provided, you must rebuild binary |
| 113 |
|
packages from the RPM source packages first (see below). |
| 114 |
|
Typical rpm commands look like: |
| 115 |
|
|
| 116 |
|
<programlisting> |
| 117 |
|
rpm --install Thuban-0.9.0-1.i386.rpm |
| 118 |
|
</programlisting> |
| 119 |
|
|
| 120 |
|
Depending on what you already have installed on your |
| 121 |
|
system, you are informed that some packages are |
| 122 |
|
required, but not installed. You need to install them |
| 123 |
|
first. Either they are provided by your GNU/Linux distributor |
| 124 |
|
or available somewhere on the Internet. |
| 125 |
|
The more essential and special ones are provided together |
| 126 |
|
with the Thuban package. |
| 127 |
|
</para> |
| 128 |
|
|
| 129 |
|
<para> |
| 130 |
|
For rpm exist some graphical user interfaces, notably |
| 131 |
|
kpackage, GnoRPM and xrpm. |
| 132 |
|
</para> |
| 133 |
|
|
| 134 |
|
<para> |
| 135 |
|
Make yourself familiar with one of the tools and apply it |
| 136 |
|
to install the packages. |
| 137 |
|
Note, that you need to be administrator (root) for the system |
| 138 |
|
to do that. |
| 139 |
|
</para> |
| 140 |
|
</section> |
| 141 |
|
<section><title>Build Binaries from Source Packages</title> |
| 142 |
|
<para> |
| 143 |
|
This section describes howto build RPM install-packages |
| 144 |
|
from RPM source-packages. |
| 145 |
|
This adapts and optimizes an install-package specifically |
| 146 |
|
to your system. |
| 147 |
|
This is especially helpful to resolve version conflicts of |
| 148 |
|
dependent packages. Furthermore, install-packages for other |
| 149 |
|
platforms (e.g. PowerPC) can be created. |
| 150 |
|
</para> |
| 151 |
|
|
| 152 |
|
<para> |
| 153 |
|
Note: rpm must be at least version 4. Execute |
| 154 |
|
<literal>rpm --version</literal> to find out about the version. |
| 155 |
|
</para> |
| 156 |
|
|
| 157 |
|
<para> |
| 158 |
|
You need to do the following preparations to be able to |
| 159 |
|
build the packages as a regular user. You should now |
| 160 |
|
perform the package buling as root since this |
| 161 |
|
might cause damage to your system. |
| 162 |
|
<itemizedlist> |
| 163 |
|
<listitem> |
| 164 |
|
<para> |
| 165 |
|
Create RPM directory structure: |
| 166 |
|
Choose a directory (e.g. $HOME/myrpm) and create the |
| 167 |
|
subdirectories BUILD, RPM, SOURCES, SPECS and SRPMS. |
| 168 |
|
A possible command sequence for this is: |
| 169 |
|
<programlisting> |
| 170 |
|
mkdir $HOME/freegisrpm |
| 171 |
|
cd $HOME/freegisrpm |
| 172 |
|
mkdir BUILD RPMS SOURCES SPECS SRPMS |
| 173 |
|
</programlisting> |
| 174 |
|
</para> |
| 175 |
|
</listitem> |
| 176 |
|
<listitem> |
| 177 |
|
<para> |
| 178 |
|
Set environment variable RPM_DIR: |
| 179 |
|
<programlisting> |
| 180 |
|
export RPM_DIR=$HOME/freegisrpm |
| 181 |
|
</programlisting> |
| 182 |
|
</para> |
| 183 |
|
</listitem> |
| 184 |
|
<listitem> |
| 185 |
|
<para> |
| 186 |
|
Create $HOME/.rpmmacros: |
| 187 |
|
This file sets general preferences and some |
| 188 |
|
specific settings for signing packages. |
| 189 |
|
If you don't have a GnuPG-key, you can skip |
| 190 |
|
the signature settings i.e. drop the last 4 lines. |
| 191 |
|
A signature becomes important when you want to |
| 192 |
|
give away packages to third parties. |
| 193 |
|
<programlisting> |
| 194 |
|
<![CDATA[ |
| 195 |
|
%packager Name Lastname <[email protected]> |
| 196 |
|
|
| 197 |
|
%_topdir /home/mylogin/myrpm |
| 198 |
|
|
| 199 |
|
%_signature gpg |
| 200 |
|
%_gpg_name Name Lastname |
| 201 |
|
%_pgp_path ~/.gnupg |
| 202 |
|
%_pgpbin /usr/bin/gpg |
| 203 |
|
]]> |
| 204 |
|
</programlisting> |
| 205 |
|
</para> |
| 206 |
|
</listitem> |
| 207 |
|
</itemizedlist> |
| 208 |
|
|
| 209 |
|
Now you can install any RPM source-package. |
| 210 |
|
It's components are installed into the corresponding |
| 211 |
|
subdirectories of your rpm-directory. |
| 212 |
|
Essentially these are the sources (into directory SOURCES) |
| 213 |
|
and the so-called spec-file which contains all build |
| 214 |
|
instructions. The spec-file will go into the SPEC directory. |
| 215 |
|
Example: |
| 216 |
|
<literal>rpm --install Thuban-0.9.0-1.src.rpm</literal> |
| 217 |
|
</para> |
| 218 |
|
|
| 219 |
|
<para> |
| 220 |
|
Create install-package: |
| 221 |
|
Go to the directory with the spec-files and rebuild the |
| 222 |
|
package: |
| 223 |
|
<programlisting> |
| 224 |
|
cd $HOME/mypm/SPECS |
| 225 |
|
rpm -bb thuban.spec |
| 226 |
|
</programlisting> |
| 227 |
|
Next, you will find the newly created package in |
| 228 |
|
$HOME/myrpm/RPMS/i386. |
| 229 |
|
If you build the package for another architecture than |
| 230 |
|
i386, then the name of the directory has a corresponding name. |
| 231 |
|
</para> |
| 232 |
|
<para> |
| 233 |
|
For documentation of RPM, either type |
| 234 |
|
<literal>man rpm</literal> or <literal>rpm --help</literal>. |
| 235 |
|
This will provide you with information on the various command |
| 236 |
|
line options of RPM. |
| 237 |
|
For more information see the |
| 238 |
|
<ulink url="http://www.rpm.org/">homepage of RPM</ulink>. |
| 239 |
|
</para> |
| 240 |
|
</section> |
| 241 |
|
</section> |
| 242 |
</section> |
</section> |
| 243 |
|
|
| 244 |
<section><title>The Main Window</title> |
<section><title>The Main Window</title> |
| 391 |
|
|
| 392 |
<section><title>Adding and Removing Layers</title> |
<section><title>Adding and Removing Layers</title> |
| 393 |
<para> |
<para> |
| 394 |
There are two types of layers that can be added to a map: shape layers |
There are two types of layers that can be added to a map: Shape layers |
| 395 |
and image layers. Shape layers are stored in Shapefile format, a |
and image layers. Shape layers are stored in Shapefile format, a |
| 396 |
standard file format for storing geographic objects. These |
widely used file format for storing geographic objects. These |
| 397 |
files have the extension ``.shp''. Associated with |
files have the extension ``.shp''. Associated with |
| 398 |
the shape file is a database file which stores attributes for |
the shape file is a database file which stores attributes for |
| 399 |
each shape in the shape file. This file, in dBase format, |
each shape in the Shape file. This file, in dBase format, |
| 400 |
has the extension ``.dbf''. Both files must have the same base name. |
has the extension ``.dbf''. Both files must have the same base name. |
| 401 |
For example, if there is a shape file named roads.shp there must |
For example, if there is a shape file named roads.shp there must |
| 402 |
also be a file roads.dbf. |
also be a file roads.dbf. |
| 407 |
<guimenu>Map</guimenu> |
<guimenu>Map</guimenu> |
| 408 |
<guimenuitem>Add Layer</guimenuitem> |
<guimenuitem>Add Layer</guimenuitem> |
| 409 |
</menuchoice>. |
</menuchoice>. |
| 410 |
Thuban will load all files with the same base name, so it doesn't |
Initially, only the ``.shp'' files are shown which is enough for the |
| 411 |
matter if the shape file or database file is selected. |
selection. However, if you switch to display all files and select one |
| 412 |
|
of the associated files (e.g. ``.dbf''), Thuban will recognize the base |
| 413 |
|
name and load the corresponding Shape file. |
| 414 |
|
</para> |
| 415 |
|
<para> |
| 416 |
|
The file dialog for Shape files allows to select multiple files. |
| 417 |
|
Use the shift-button together with the left mouse button to extend |
| 418 |
|
the selection. |
| 419 |
</para> |
</para> |
| 420 |
|
|
| 421 |
<para> |
<para> |
| 1379 |
</section> |
</section> |
| 1380 |
</chapter> |
</chapter> |
| 1381 |
|
|
| 1382 |
|
<chapter><title>Extensions</title> |
| 1383 |
|
<para> |
| 1384 |
|
Thuban is designed to be extensible. The term Extension is used as a |
| 1385 |
|
general term for anything that extends Thuban. |
| 1386 |
|
This chapter introduces into some oppportunities how to add and |
| 1387 |
|
handle extra functionality developed by your own or third parties. |
| 1388 |
|
</para> |
| 1389 |
|
|
| 1390 |
|
<section><title>Add personal extensions via thubanstart.py</title> |
| 1391 |
|
<para> |
| 1392 |
|
After Thuban has been started for the first time, a directory |
| 1393 |
|
.thuban is created within your home directory. |
| 1394 |
|
There you can add a file thubanstart.py which will be imported |
| 1395 |
|
by Thuban at start-up. It is recommended to add only import-statements |
| 1396 |
|
to this file to keep the actual code of extensions separate. |
| 1397 |
|
</para> |
| 1398 |
|
<para> |
| 1399 |
|
The modules to import must either be found through the environment |
| 1400 |
|
variable PYTHONPATH or directly be placed into the .thuban-directory. |
| 1401 |
|
</para> |
| 1402 |
|
<para> |
| 1403 |
|
As an example, copy the file examples/simple_extensions/hello_world.py |
| 1404 |
|
of the Thuban source code into the .thuban-directory of your home |
| 1405 |
|
directory. Now add add the statement import hello_world to the |
| 1406 |
|
file thubanstart.py and run Thuban. You will notice an additional |
| 1407 |
|
menu <menuchoice><guimenu>Extensions</guimenu></menuchoice> where |
| 1408 |
|
the new item for the Hello-World extension is placed - select it |
| 1409 |
|
to see the Hello-World message. |
| 1410 |
|
</para> |
| 1411 |
|
</section> |
| 1412 |
|
|
| 1413 |
|
<section><title>Extensions included in Thuban package</title> |
| 1414 |
|
<para> |
| 1415 |
|
The extensions described in this section are part of the |
| 1416 |
|
Thuban package, but not activated by default. |
| 1417 |
|
You will find them in the Thuban installation directory |
| 1418 |
|
under <literal>Extensions/</literal>. Activate them as personal |
| 1419 |
|
extensions via PYTHONPATH as described in the previous section. |
| 1420 |
|
Stable extensions will appear under the menu |
| 1421 |
|
<menuchoice><guimenu>Extensions</guimenu></menuchoice> and |
| 1422 |
|
extensions which are in experimental state and therefore |
| 1423 |
|
not fully functional under |
| 1424 |
|
<menuchoice><guimenu>Experimental</guimenu></menuchoice>. |
| 1425 |
|
</para> |
| 1426 |
|
|
| 1427 |
|
<section><title>Stable extensions</title> |
| 1428 |
|
<para> |
| 1429 |
|
These extensions provide extra-functionality to Thuban |
| 1430 |
|
that has not (yet) been integrated in the main application. |
| 1431 |
|
They are considered to be free of bugs, but may be |
| 1432 |
|
further polished with helpful user interactions. |
| 1433 |
|
</para> |
| 1434 |
|
<section><title>gns2shp</title> |
| 1435 |
|
<para> |
| 1436 |
|
This tool converts data of the Geospatial Names Server |
| 1437 |
|
(GNS, see <ulink url="http://www.nima.mil/gns"/>) |
| 1438 |
|
into Shapefile format. |
| 1439 |
|
The above web-site offer to download named places |
| 1440 |
|
information grouped by countries for all of the world |
| 1441 |
|
except USA for which other data are provided. |
| 1442 |
|
</para> |
| 1443 |
|
<para> |
| 1444 |
|
If you download and unpack a package, you will have |
| 1445 |
|
a text-file with suffix .txt. |
| 1446 |
|
Selecting such a file via gns2shp will create the |
| 1447 |
|
corresponding Shapefile with the same basename and |
| 1448 |
|
place it in the same direcory. Afterwards it |
| 1449 |
|
is automatically loaded into Thuban. |
| 1450 |
|
The Shapefile will not automatically be delete afterwards. |
| 1451 |
|
</para> |
| 1452 |
|
<para> |
| 1453 |
|
The gns2shp.py module can also be executed on the |
| 1454 |
|
command line for batch processing purposes. |
| 1455 |
|
</para> |
| 1456 |
|
<para> |
| 1457 |
|
A sample (<literal>ls.txt</literal> for Liechtenstein) |
| 1458 |
|
is included in the directory |
| 1459 |
|
<literal>Extensions/gns2shp/test</literal>. |
| 1460 |
|
</para> |
| 1461 |
|
</section> |
| 1462 |
|
</section> |
| 1463 |
|
<section><title>Experimental extensions</title> |
| 1464 |
|
<para> |
| 1465 |
|
All all of these functions have to be handled with care, |
| 1466 |
|
since they are neither complete nor well tested. |
| 1467 |
|
They are to be seen as a proof-of-concept and may |
| 1468 |
|
additionally in some cases of practical help. |
| 1469 |
|
</para> |
| 1470 |
|
<para> |
| 1471 |
|
Any interest on further improvement of these extensions |
| 1472 |
|
should be communicated towards the developer and user |
| 1473 |
|
community. |
| 1474 |
|
</para> |
| 1475 |
|
|
| 1476 |
|
<section><title>importAPR</title> |
| 1477 |
|
<para> |
| 1478 |
|
This command offer to load an ESRI� ArcView� project |
| 1479 |
|
file (suffix .apr) and convert it for use within Thuban. |
| 1480 |
|
After selecting a apr-file to load, a list |
| 1481 |
|
will be presented that offers to select one of the views |
| 1482 |
|
of the apr-file, provided there is more than one. |
| 1483 |
|
Furthermore, the Session Info-Tree is extended with |
| 1484 |
|
a complete representation of the parsed apr-file. |
| 1485 |
|
</para> |
| 1486 |
|
<para> |
| 1487 |
|
The legend of Thuban does not yet cover all of the elements as |
| 1488 |
|
supported by the legend of ArcView�. Therefore, the Thuban |
| 1489 |
|
map will look different. Furthermore, the apr-format is |
| 1490 |
|
a proprietary format, not openly documented. |
| 1491 |
|
Therefore, the interpretation is |
| 1492 |
|
partly based on reverse engeneering and good guessing. |
| 1493 |
|
</para> |
| 1494 |
|
<para> |
| 1495 |
|
The file-paths within the apr-file may not fit and potentially |
| 1496 |
|
are subject to fix in the apr-file. You can do this |
| 1497 |
|
applying any text editor. The paths are either absolute |
| 1498 |
|
or relative from where Thuban has been started. |
| 1499 |
|
</para> |
| 1500 |
|
<para> |
| 1501 |
|
A sample for the Iceland data is included as |
| 1502 |
|
<literal>Extensions/importAPR/samples/iceland.apr</literal>. |
| 1503 |
|
The file-paths are relative from the Thuban main directory. |
| 1504 |
|
</para> |
| 1505 |
|
</section> |
| 1506 |
|
</section> |
| 1507 |
|
</section> |
| 1508 |
|
|
| 1509 |
|
<section><title>Writing simple extensions</title> |
| 1510 |
|
<para> |
| 1511 |
|
Writing an extension for Thuban basically means to |
| 1512 |
|
implement the extra functionality in Python with all of the |
| 1513 |
|
Thuban classes, methods and variables available. |
| 1514 |
|
</para> |
| 1515 |
|
<para> |
| 1516 |
|
All classes and their methods are documented in the source code |
| 1517 |
|
(see their doc-strings). Here is an example from |
| 1518 |
|
Thuban/Model/layer.py that describes some of the methods |
| 1519 |
|
of a Layer object: |
| 1520 |
|
</para> |
| 1521 |
|
<programlisting> |
| 1522 |
|
<![CDATA[ |
| 1523 |
|
class BaseLayer(TitledObject, Modifiable): |
| 1524 |
|
|
| 1525 |
|
"""Base class for the layers.""" |
| 1526 |
|
|
| 1527 |
|
def __init__(self, title, visible = True, projection = None): |
| 1528 |
|
"""Initialize the layer. |
| 1529 |
|
|
| 1530 |
|
title -- the title |
| 1531 |
|
visible -- boolean. If true the layer is visible. |
| 1532 |
|
""" |
| 1533 |
|
TitledObject.__init__(self, title) |
| 1534 |
|
Modifiable.__init__(self) |
| 1535 |
|
self.visible = visible |
| 1536 |
|
self.projection = projection |
| 1537 |
|
|
| 1538 |
|
def Visible(self): |
| 1539 |
|
"""Return true if layer is visible""" |
| 1540 |
|
return self.visible |
| 1541 |
|
|
| 1542 |
|
def SetVisible(self, visible): |
| 1543 |
|
"""Set the layer's visibility.""" |
| 1544 |
|
self.visible = visible |
| 1545 |
|
self.issue(LAYER_VISIBILITY_CHANGED, self) |
| 1546 |
|
|
| 1547 |
|
def HasClassification(self): |
| 1548 |
|
"""Determine if this layer support classifications.""" |
| 1549 |
|
... |
| 1550 |
|
]]> |
| 1551 |
|
</programlisting> |
| 1552 |
|
<para> |
| 1553 |
|
This example intends to give you an impression of the |
| 1554 |
|
source-code-level documentation. |
| 1555 |
|
You have to make yourself familiar with |
| 1556 |
|
the Python programming language to understand some special |
| 1557 |
|
code elements. |
| 1558 |
|
</para> |
| 1559 |
|
<section><title>hello_world.py</title> |
| 1560 |
|
<para> |
| 1561 |
|
Traditionally, the first example should welcome the world. |
| 1562 |
|
Most of the code handles the frame for integrating a menu |
| 1563 |
|
item into Thuban while the actual raising of a message |
| 1564 |
|
is done in a single line. |
| 1565 |
|
</para> |
| 1566 |
|
<programlisting> |
| 1567 |
|
<![CDATA[ |
| 1568 |
|
# Copyright (C) 2003 by Intevation GmbH |
| 1569 |
|
# Authors: |
| 1570 |
|
# Jan-Oliver Wagner <[email protected]> |
| 1571 |
|
# |
| 1572 |
|
# This program is free software under the GPL (>=v2) |
| 1573 |
|
# Read the file COPYING coming with Thuban for details. |
| 1574 |
|
|
| 1575 |
|
""" |
| 1576 |
|
Extend Thuban with a sample Hello World to demonstrate simple |
| 1577 |
|
extensions. |
| 1578 |
|
""" |
| 1579 |
|
|
| 1580 |
|
__version__ = '$Revision$' |
| 1581 |
|
|
| 1582 |
|
# use _() already now for all strings that may later be translated |
| 1583 |
|
from Thuban import _ |
| 1584 |
|
|
| 1585 |
|
# Thuban has named commands which can be registered in the central |
| 1586 |
|
# instance registry. |
| 1587 |
|
from Thuban.UI.command import registry, Command |
| 1588 |
|
|
| 1589 |
|
# The instance of the main menu of the Thuban application |
| 1590 |
|
# See Thuban/UI/menu.py for the API of the Menu class |
| 1591 |
|
from Thuban.UI.mainwindow import main_menu |
| 1592 |
|
|
| 1593 |
|
def hello_world_dialog(context): |
| 1594 |
|
"""Just raise a simple dialog to greet the world. |
| 1595 |
|
|
| 1596 |
|
context -- The Thuban context. |
| 1597 |
|
""" |
| 1598 |
|
context.mainwindow.RunMessageBox(_('Hello World'), _('Hello World!')) |
| 1599 |
|
|
| 1600 |
|
|
| 1601 |
|
# create a new command and register it |
| 1602 |
|
registry.Add(Command('hello_world', _('Hello World'), hello_world_dialog, |
| 1603 |
|
helptext = _('Welcome everyone on this planet'))) |
| 1604 |
|
|
| 1605 |
|
# find the extensions menu (create it anew if not found) |
| 1606 |
|
extensions_menu = main_menu.find_menu('extensions') |
| 1607 |
|
if extensions_menu is None: |
| 1608 |
|
extensions_menu = main_menu.InsertMenu('extensions', _('E&xtensions')) |
| 1609 |
|
|
| 1610 |
|
# finally bind the new command with an entry in the extensions menu |
| 1611 |
|
extensions_menu.InsertItem('hello_world') |
| 1612 |
|
]]> |
| 1613 |
|
</programlisting> |
| 1614 |
|
</section> |
| 1615 |
|
<section><title>Registering a Command</title> |
| 1616 |
|
<para> |
| 1617 |
|
Mainly, our new function has to be registered to the Thuban |
| 1618 |
|
framework in order to connect it to the menu. A registered |
| 1619 |
|
command can also be connected to e.g. a toolbar button. |
| 1620 |
|
</para> |
| 1621 |
|
<para> |
| 1622 |
|
The instances and classes for this are imported at the beginning. |
| 1623 |
|
Any code not inside a method or class is directly executed when |
| 1624 |
|
the source-code module is imported. Therefore, the second |
| 1625 |
|
part of this example consist of the plain statements to create a new |
| 1626 |
|
Command and to add it to the menu. |
| 1627 |
|
</para> |
| 1628 |
|
<para> |
| 1629 |
|
By convention, it looks for a menu registered as ``extensions'' to |
| 1630 |
|
insert the new command. If it does not exist yet, it gets created. |
| 1631 |
|
It is advisable to copy this code for any of your extensions. |
| 1632 |
|
</para> |
| 1633 |
|
</section> |
| 1634 |
|
<section><title>The Thuban context</title> |
| 1635 |
|
<para> |
| 1636 |
|
A registered command that is called, always receives the |
| 1637 |
|
Thuban context. This instance provides our method with |
| 1638 |
|
hook references to all important components of the Thuban |
| 1639 |
|
application. |
| 1640 |
|
</para> |
| 1641 |
|
<para> |
| 1642 |
|
In the example hello_world.py, our function uses the |
| 1643 |
|
mainwindow component which offers a method to raise a |
| 1644 |
|
message dialog. In total there are three hooks: |
| 1645 |
|
<itemizedlist> |
| 1646 |
|
<listitem> |
| 1647 |
|
<para>application: |
| 1648 |
|
This object is the instance of the Thuban Application class. |
| 1649 |
|
Except maybe for loading or savinf sessions, you will not |
| 1650 |
|
need this object for a simple extension. |
| 1651 |
|
See Thuban/UI/application.py for the API. |
| 1652 |
|
</para> |
| 1653 |
|
</listitem> |
| 1654 |
|
<listitem> |
| 1655 |
|
<para>session: |
| 1656 |
|
The instance of the current session. It manages the sessions' |
| 1657 |
|
map and tables. You can set and remove the map or tables. |
| 1658 |
|
In may also get the map object. However, you should know that |
| 1659 |
|
internally it is already prepared to handle many maps. |
| 1660 |
|
Therfore, currently you would always receive a list with exactlty |
| 1661 |
|
one element. In the future, if there are more than one map, |
| 1662 |
|
you will not know which one is the currently display one and |
| 1663 |
|
therefore you should use the mainwindow as hook to find |
| 1664 |
|
the currently displayed map. |
| 1665 |
|
See Thuban/Model/session.py for the API. |
| 1666 |
|
</para> |
| 1667 |
|
</listitem> |
| 1668 |
|
<listitem> |
| 1669 |
|
<para> |
| 1670 |
|
mainwindow: The mainwindow object is central to manage various |
| 1671 |
|
GUI things such as the Legend sub-window. Most notably, |
| 1672 |
|
you get access to the canvas which is the window part where |
| 1673 |
|
the map is drawn. The canvas knows, which map it currently |
| 1674 |
|
draws and therefore you get the current map via |
| 1675 |
|
context.mainwindow.canvas.Map(). |
| 1676 |
|
See Thuban/UI/mainwindow.py for the API. |
| 1677 |
|
</para> |
| 1678 |
|
</listitem> |
| 1679 |
|
</itemizedlist> |
| 1680 |
|
</para> |
| 1681 |
|
</section> |
| 1682 |
|
</section> |
| 1683 |
|
</chapter> |
| 1684 |
|
|
| 1685 |
<chapter><title>Trouble Shooting</title> |
<chapter><title>Trouble Shooting</title> |
| 1686 |
<para> |
<para> |
| 1687 |
Here are a few problems that users have encountered when first using Thuban. |
Here are a few problems that users have encountered when first using Thuban. |
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