Changes between Version 8 and Version 9 of pps/tutorial_basic

Timestamp:

Sep 30, 2008, 8:06:43 PM (16 years ago)

Author:

rgrieder

Comment:

—

pps/tutorial_basic

@@ -41 +41 @@
 == TutorialShip Class ==
 We have derived a new type of !SpaceShip for you: !TutorialShip. The back end doesn't have to bother you (you will notice that some functions don't seem to be doing anything at all). [[br]]
+
+=== Loading the right type of ship ===
 At the moment, you are loading an object of the !SpaceShip class. We would like to change this. Fortunately this can be done in an XML file where we load the level.
  1. Go to your media repository (orxonox/Media) and open ''tutorial.oxw'' in the ''level'' folder with a text editor like vim, nano, etc.
  1. Find the second paragraph (about 5th line) and change ''!SpaceShip'' to ''!TutorialShip''
  1. Save the file. You can keep it open, we need it again later.
+
+=== CMake files adjustments ===
 Next thing will be to change the code accordingly, since the game will probably crash now when started. [[br]]
 We organise our source files via CMake as you have already found out. You now have to tell CMake to also compile the ''TutorialShip'':
@@ -50 +54 @@
  1. You will see a large list of source files (*.cc). You can add "oxonox/TutorialShip.cc" anywhere you like, but it is preferred to organise the file a little bit. So look for !SpaceShip.cc and add things there.
  1. Save and close.
+
+=== Coding: RegisterObject() and SetConfigValue() ===
 The interesting part: Modifying the C++ code. '''Open orxonox/trunk/src/orxonox/objects/TutorialShip.cc'''. As you have already heard from Fabian, the Core Framework is like a language extension to C++. But it cannot be fully automatic. That means you have to add a few lines accordingly:
  1. Find the constructor (TutorialShip::TutorialShip()) and add '''RegisterObject(TutorialShip);''' as the first statement. This is used for the class hierarchy and for the ObjectLists. Whenever you derive from OrxonoxClass or any derivative, this call is necessary.
  2. Next will be creating a configurable value in our class. This enables us to configure the TutorialShip from outside (Shell or orxonox.ini). Go to the ''setConfigValues()'' and configure the member variable ''reloadTime_'' with a default value of 0.125. Remember the syntax:
-{{{ SetConfigValue(''variable name'', ''default value'').description(''description text''); }}}
+{{{
+SetConfigValue(''variable name'', ''default value'').description(''description text'');
+}}}
+
+=== Coding: ConsoleCommand ===
  3. The console command: It enables you to call a static function in the shell. Currently, our TutorialShip cannot fire any projectiles because there is no ConsoleCommand for "fire". This code is static, so we have to go to the beginning of the source code, just after {{{namespace orxonox {}}}. Now add a !ConsoleCommand for the static function ''fire()'' of the TutorialShip:
-{{{ SetConsoleCommand(''class name'', ''function name'', true).keybindMode(KeybindMode::''mode''); }}}
+{{{
+SetConsoleCommand(''class name'', ''function name'', true).keybindMode(KeybindMode::''mode'');
+}}}
     keybindMode specifies how the console command should be treated when used on a key. ''OnHold'' means the command gets fired continuously, ''OnRelease'' and ''OnPress'' only once. [[br]]
 
+=== First run test and the Shell ===
 We haven't done everything yet, but a little function test would be nice. Compile Orxonox and run it just according to instructions above. If it doesn't compile at all, try to understand the error message and if that doesn't help, ask an assistant. [[br]]
 You should now see exactly what you saw last time. The ship still won't fire anything. To change that we can assign that static ''fire()'' function to a key or button. To do that, open the console with the key just above "tab". To bind a console command to a key, type '''{{{keybind fire}}}''' (keybind is a command itself actually), hit enter and then hit the key or button you would like to assign the command to (preferably the left mouse button...). Close the console and try to fire a projectile (mouse would also work with an open console).[[br]][[br]]
 
+=== orxonox.ini and the "config" command ===
 Now exit the game by hitting ''Esc'' or typing "exit" into the console. In order to change the reload time of the ship's weapon open src/bin/orxonox.ini and look for the section called '''[TutorialShip]'''. There you should see the entry '''reloadTime_'''. Set it to 1.0, save the file and start orxonox again (you don't need to compile anything now). Laggy weapon, right? To change it back open then console and enter "config T". Hit tab then and you will see a list of classes starting with "T" having config values (only ''TutorialShip'' for now). Hit tab again and the shell completes your text. Hit tab two times more and it will even complete the (only) configurable value ''reloadTime_''. You can see the old value being 1.0 above. You need to add a value to the command in order to change the !ConfigValue. Complete instruction now:
-{{{ config TutorialShip reloadTime_ 0.1 }}}
-You should now be able to fire quicker. It doesn't yet go faster than the framerate though.
+{{{
+config TutorialShip reloadTime_ 0.1
+}}}
+You should now be able to fire quicker. It doesn't yet go faster than the framerate though. [[br]][[br]]
+
+=== XML loading ===
+This part is about how you can load class parameters with XML. Unlike ConfigValues, XML parameters are per object instead of per class. That means you can load multiple objects of the same class with different settings. We are now going to add one XML parameter for the TutorialShip class. [[br]]
+1. Find the ''XMLPort()'' function in the source file. You can see that there is comment but no statement after it. That's where you can insert the macro which specifies a parameter. Keep in mind that when loading with XMLPort, you need to have an access and a store function (not just a variable). These have already been created for the ''specialEffects'' parameter which tells the underlaying !SpaceShip whether to visualise the special effects. The syntax for XML parameters is:
+{{{
+XMLPortParam(class name, parameter name as string, setSpecialEffects, hasSpecialEffects, xmlelement, mode);
+}}}
+(You only need to adjust the first two macro parameters)
+
+=== Logging messages ===
+Stay in the ''XMLPort()'' function and add a statement at the end to display a log message with output level 3:
+{{{
+COUT(3) << "My name is Bond. James Bond." << std::endl;
+}}}
+Your job is to make the message sound meaningful for this particular ''XMLPort()'' function.