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| − | by [http://forums.wesnoth.org/memberlist.php?mode=viewprofile&u=119614 artisticdude] and [http://forums.wesnoth.org/memberlist.php?mode=viewprofile&u=110012 Gambit]
| + | {{Translations}} |
| | | | |
| | + | Welcome to the WML Guide for Complete Beginners! From here, you can get started directly by heading to the [[WML for Complete Beginners: Introduction|Introduction]] or you can continue from the chapter you left off. |
| | | | |
| − | '''Template for future "WML for Complete Beginners" tutorial'''
| + | ==Main Index== |
| | | | |
| − | '''Note: this is a work in progress.'''
| + | <onlyinclude> |
| − | -------------
| + | {| class="wikitable" |
| − | | + | <includeonly>|- |
| − | | + | |[[WML for Complete Beginners|Index]]</includeonly> |
| − | | + | |- |
| − | | + | |[[WML_for_Complete_Beginners:_Introduction|Introduction]] |
| − | ==Introduction== | + | |- |
| − | | + | |[[WML_for_Complete_Beginners:_Chapter_1|1 - Syntax]] |
| − | Hey there!
| + | |- |
| − | | + | |[[WML_for_Complete_Beginners:_Chapter_2|2 - The Userdata Directory and the Campaign Folder]] |
| − | Now I'm guessing that, if you're reading this, you already know what The Battle for Wesnoth is. If you don't, I suggest finding before you read this tutorial.
| + | |- |
| − | | + | |[[WML_for_Complete_Beginners:_Chapter_3|3 - The _main.cfg]] |
| − | Some people may wonder what the purpose of this tutorial is. "We already have almost every aspect of WML covered in the [[ReferenceWML]] section," these people might say. But the information contained in the WML reference section is just that: a reference. Not a tutorial. This page aims to introduce complete beginners to WML without their having to sift for days through "references" until WML finally begins to make some sort of sense.
| + | |- |
| − | | + | |[[WML_for_Complete_Beginners:_Chapter_4|4 - Creating Your First Scenario]] |
| − | ===Who This Tutorial is For===
| + | |- |
| − | This tutorial is aimed at users with no previous programming knowledge. This tutorial does assume that you have a certain level of competence in basic computer skills and concepts, such as opening and editing text files, and being able to follow folder directories. In this tutorial you will learn WML by building a short single-player campaign from the ground up.
| + | |[[WML_for_Complete_Beginners:_Chapter_5|5 - Events]] |
| − | | + | |- |
| − | ===What Tools You Will Need===
| + | |[[WML_for_Complete_Beginners:_Chapter_6|6 - Custom Units]] |
| − | | + | |- |
| − | Programming WML requires only one tool: a basic text editor. You don't need a fancy word processor to program WML; a simple program like Windows Notepad or Mac OS X TextEdit will work just fine. For Linux, there is a very nice text editing application called Kate that actually comes with syntax highlighting for WML.
| + | |[[WML_for_Complete_Beginners:_Chapter_7|7 - Variables Introduction]] |
| − | | + | |- |
| − | Obviously, you will also need The Battle for Wesnoth installed on your computer.
| + | |[[WML_for_Complete_Beginners:_Chapter_8|8 - Non-scalar Variables]] |
| − | | + | |- |
| − | ===So What Exactly is WML?===
| + | |[[WML_for_Complete_Beginners:_Chapter_9|9 - Macros]] |
| − | | |
| − | WML is an acronym for the "Wesnoth Markup Language", a custom scripting language that The Battle For Wesnoth uses to allow players to create and modify content without having to learn a much more complex language like Lua or C++. Now I'm going to say this here and now: don't think you can learn WML overnight. Although WML is relatively easy to learn, it will take a certain amount of effort, time and dedication to fully understand the ins and outs of the language.
| |
| − | | |
| − | ==Chapter 1: Syntax==
| |
| − | | |
| − | First things first; let's go over the ''syntax'' of WML.
| |
| − | | |
| − | For those of you who might not know what the "syntax" of a language is, think of it as a set of rules for how WML needs to be written in order for the game to understand it. This concept may sound a bit confusing, but whether you realize it or not you have been using the concept of syntax your entire life! Think of the structure of a sentence in English: "I like jelly and cheese sandwiches." That sentence uses a certain set of rules, or ''syntax'' in order to make sense to people who hear or read it. If you said instead, "Like cheese I and sandwiches jelly", that would make no sense, and no one would understand what you were saying. Likewise, if you said "I like cheese sandwiches and jelly", that would change the entire meaning of the sentence!
| |
| − | | |
| − | Just like the syntax of the English language, WML syntax also requires proper capitalization, spelling, grammar and punctuation in order for others to understand what you're saying or writing. For example, if you decided to ignore the syntax of the English language and wrote something like this: "won day mary and i had went to seen the elefant at the zoo it's trunc was reely long", chances are people would not understand much of what you wrote. On the other hand, if you used the correct syntax and wrote: "One day Mary and I went to see the elephant at the zoo. Its trunk was really long!", people can easily understand what you wrote because it is written in the syntax they recognize and understand. Just as English-reading people would be unable to understand something were it not written in the correct English syntax, the Battle for Wesnoth game is unable to read any WML that is not written in the correct WML syntax.
| |
| − | | |
| − | So now let's go over the basics of WML syntax. Later on you will be gradually introduced to more complex WML syntax, but for now we'll just go over the basic stuff, enough to get you started.
| |
| − | | |
| − | ===Basic Components: Tags and Attributes===
| |
| − | | |
| − | WML, as one can infer from the meaning of the acronym, is a [http://en.wikipedia.org/wiki/Markup_language markup language]. This means that the syntax of the entire language consists of two fundamental elements: tags and attributes.
| |
| − | | |
| − | ====Tags====
| |
| − | :A tag is a string of lowercase text encapsulated by two square brackets, one at either end. This is an example of a "campaign" tag:
| |
| − | [campaign]
| |
| − | | |
| − | :Tags can only contain alphanumeric characters (letters and numbers) and underscores "_". Notice I said earlier that "a tag is a string of ''lowercase'' text". This is a fundamental aspect of the WML syntax: all tags are always written in lowercase letters. If you try and use capital letters (even just one), the WML engine won't be able to understand what tag you're trying to use and will give you an error when it tries to read the incorrect tag. | |
| − | | |
| − | :As with most markup languages, in WML tags are always used in pairs: one opening tag and one closing tag. Think of the opening tag and the closing tag like the covers of a book: when you open the front cover, you know you're at the beginning. When you reach the back cover, you know you're done reading the book. Likewise, when the WML engine finds an opening tag, it realizes it's at the beginning of a task. When it reaches the closing tag, it realizes it has finished the task.
| |
| − | | |
| − | :Closing tags are exactly the same as opening tags except for one key component: closing tags always have a forward slash "/" immediately after the first square bracket. This forward slash tells the WML engine that this tag is a closing tag and not another opening tag. Here is an example of the closing "campaign" tag:
| |
| − | [/campaign]
| |
| − | | |
| − | :The opening and closing tag together are referred to as a "tagset". A tagset always contains exactly two tags: the opening tag and the closing tag. So the "campaign" tagset would look like this:
| |
| − | [campaign]
| |
| − | [/campaign]
| |
| − | | |
| − | | |
| − | :So now we know how the WML engine knows where the beginning and end of a task are, and what syntax to use when writing them. These are the basics of tags. Later on we'll go over the more complicated aspects of tags; for now though, make sure you understand the concepts introduced here. Before we move on to the next section, let's review the points we've learned in this section about tags:
| |
| − | | |
| − | ::*A tag is a string of lowercase text encapsulated by two square brackets, one at either end.
| |
| − | ::*A closing tag is exactly the same as an opening tag except for the forward slash immediately following the first square bracket.
| |
| − | ::*The opening tag and the closing tag together are called the tagset.
| |
| − | ::*A tagset consists of exactly two tags: the opening tag and the closing tag.
| |
| − | | |
| − | :So now we know how to tell the WML engine where the beginning and the end of a task are, but what about actually making it do the task? This is where attributes come in.
| |
| − | | |
| − | | |
| − | ====Attributes====
| |
| − | | |
| − | :Attributes consist of two principal elements: ''keys'' and ''values'', and are written like so:
| |
| − | key=value
| |
| − | | |
| − | :The basic function of attributes is to store information that is needed by the WML engine. The ''key'' of the attribute specifies what kind of information is stored, and the ''value'' of the attribute is the actual data that is stored. All text to the left of the equals sign "=" is considered to be the key, and all text to the right of the equals sign is considered to be the value of the key. | |
| − | | |
| − | :This may sound rather confusing, so let's illustrate by a practical example:
| |
| − | | |
| − | :Let's say you wanted your friend to go to the grocery store and pick you up a loaf of bread. Would you say to him, "Go"? Of course not! He wouldn't understand what you wanted him to do, which means you'd have no bread for dinner. Likewise, if you only write a tagset, that's equivalent to telling the WML engine to do something, but that's not enough. You will need to be more specific about exactly what the WML engine should do. If your friend were a human WML engine and you wanted him to go to the grocery store to get some bread, you might give him this code to read (''note'': this code isn't actually real WML, it is "pseudocode", i.e. made up code for the purpose of illustration. If I ever use pseudocode during this tutorial I will tell you that it is pseudocode before you read the example, like I am doing now.):
| |
| − | [go]
| |
| − | where=grocery_store
| |
| − | get=bread
| |
| − | [/go]
| |
| − | | |
| − | :Tags give the WML engine a very very generalized idea of what kind of task to do, but without attributes to specify ''exactly'' what to do, the WML engine won't be able to do anything because you haven't given it enough specific information. This is just like if you told your friend to "Go": he'd understand that you want him to go somewhere, but he'd be unable to perform the task because he doesn't know where to go or what to do when he gets there.
| |
| − | | |
| − | '''This attributes section isn't over yet, it is a WIP and will be expanded.'''
| |
| − | | |
| − | | |
| − | ===More About Tags===
| |
| − | | |
| − | So now you should understand the basics about tags and attributes. As I promised earlier, we will now discuss some of the more involved aspects of tags.
| |
| − | | |
| − | ====Nested Tags: Parents and Children====
| |
| − | | |
| − | :A fundamental aspect of markup languages is that you can use tagsets inside other tagsets. Tagsets located inside other tagsets are called nested tagsets. In the example below, the "side" tagset is nested inside the "scenario" tagset:
| |
| − | | |
| − | [scenario]
| |
| − | [side]
| |
| − | [/side]
| |
| − | [/scenario]
| |
| − | | |
| − | :When referring to nested tagsets, the tagset located inside the other is called the ''child'' tagset, and the tagset that encloses the child tagset is known ast he ''parent'' tagset. To illustrate with pseudocode:
| |
| − | | |
| − | [parent]
| |
| − | [child]
| |
| − | [/child]
| |
| − | [/parent]
| |
| − | | |
| − | :Tagsets that are not child tagsets of any other tagsets are called ''toplevel'' tagsets. In this next example, the [scenario] tagset is a toplevel tagset, because it is not the child tagset of any other tagset. The [event] tagset is the child tagset of [scenario], because it is located inside the [scenario] tagset. The tagset [event] is also the parent tagset of the [message] tagset, because the [message] tagset is located inside the [event] tagset. That means that since [event] is the parent of [message], [message] is the child tagset of [event].
| |
| − | | |
| − | [scenario]
| |
| − | [event]
| |
| − | [message]
| |
| − | [/message]
| |
| − | [/event]
| |
| − | [/scenario]
| |
| − | | |
| − | | |
| − | ====Indentation and Levels====
| |
| − | | |
| − | :You may have noticed that in the examples above, the child tagsets are indented four spaces further to the right than are their parent tagsets. Why is this? It's because proper indentation (although not technically required by the WML engine) makes you code a lot easier to read and maintain. It's like writing an outline for a school paper, where you would write something like this: | |
| − | | |
| − | I.
| |
| − | A.
| |
| − | B.
| |
| − | C.
| |
| − | II.
| |
| − | A.
| |
| − | 1.
| |
| − | 2.
| |
| − | B.
| |
| − | C.
| |
| − | | |
| − | :Indentation makes it much easier to see whether tagset is the child or parent of other tagsets. The amount of indentation before a tagset determines in what level that tagset is located. If the tagset is a toplevel tagset (i.e. has no spaces in front of it because it is not the child of any other tagset), that tagset is located at level one. Tagsets with an indentation of four spaces in front of them are located in level 2, because they are the children of the toplevel (level 1) tagset. Tagsets that are children of level 2 tagsets are called level 3 tagsets (and are indented 12 spaces), tagsets inside level 3 tagsets are called level 4 tagsets (and are indented 16 spaces), etc. As a general rule, all the attributes of a tagset, along with any child tagsets of that tagset, are indented one level deeper than that tagset. To illustrate in pseudocode:
| |
| − | | |
| − | [toplevel_tagset]
| |
| − | level_2_attribute=value
| |
| − | [level_2_tagset]
| |
| − | level_3_attribute=value
| |
| − | [level 3 tagset]
| |
| − | level_4_attribute=value
| |
| − | [/level 3 tagset]
| |
| − | [/level_2_tagset]
| |
| − | [/toplevel_tagset]
| |
| − | | |
| − | :Indenting tagsets and attributes into levels like this makes it much easier for you (and others) to read, fix and maintain your code. It is strongly recommended that you indent exactly four spaces for each new level, although you can also use tabs instead of hitting the space key 4 times, if you'd prefer.
| |
| − | | |
| − | | |
| − | ==Chapter 2: The Userdata Directory and the Campaign Folder==
| |
| − | | |
| − | So now that you understand the basic syntax of WML, it's time to learn where The Battle for Wesnoth stores files so that we can begin creating our campaign.
| |
| − | | |
| − | ===The Userdata Directory===
| |
| − | | |
| − | There are two main directories that Wesnoth creates on your computer. The '''installation directory''' contains all the files for the core game. The '''userdata directory''' stores all your personal Wesnoth data, which includes your installed add-ons, your settings and preferences, and your saved games. The userdata directory is where we will store your work throughout this tutorial.
| |
| − | | |
| − | The location of your userdata directory differs depending on your operating system, and in the case of Microsoft Windows, the version of your operating system. Refer to the following table to determine where your userdata directory is located:
| |
| − | | |
| − | | |
| − | {| border="1"
| |
| − | !Windows XP
| |
| − | |~/My Documents/My Games/Wesnoth 1.10/
| |
| | |- | | |- |
| − | !Windows Vista and above
| + | |[[WML_for_Complete_Beginners:_Chapter_10|10 - Logic]] |
| − | |~/Documents/My Games/Wesnoth 1.10/ | |
| | |- | | |- |
| − | !Mac OS X
| + | |[[WML_for_Complete_Beginners:_Chapter_11|11 - More Logic]] |
| − | |~/Library/Application Support/Wesnoth 1.10/ | |
| | |- | | |- |
| − | !Linux
| + | |[[WML_for_Complete_Beginners:_Conclusion|Conclusion]] |
| − | |~/.local/share/wesnoth/1.10/ | |
| | |} | | |} |
| | + | </onlyinclude> |
| | | | |
| | + | ==Note for Improvements:== |
| | | | |
| − | Now navigate to your userdata folder. Provided that you have already run the Wesnoth application at least once before, you should see a total of five folders ("cache", "data", "editor", "persist", and "saves") in this directory, along with two files ("preferences" and "save_index.gz"). If you see all seven of these, everything is good. If you do not see all seven, try running the Wesnoth application. If that does not work, try restarting your computer. If neither of these steps work, reinstall Wesnoth.
| + | 1. Add to the numbers definition that numbers can include decimal point values (and reference the fact that WML will remove any unnecessary 0's when it performs the calculations or accesses the numerical value in question). |
| − | | |
| − | Of the seven objects contained in the userdata folder, you will only ever need to directly interact with two: the "data" folder and the "editor" folder.
| |
| − | | |
| − | ====The data folder====
| |
| − | | |
| − | :The data folder is where all installed add-ons are kept. This is where we will be building our campaign, when we get to that. If you have previously installed any Wesnoth add-ons, they should show up in this folder.
| |
| − | | |
| − | ====The editor folder====
| |
| − | | |
| − | :The editor folder is where all maps created with the in-game map editor are stored. If you have ever created and saved a map in-game, you should see the map file in this directory.
| |
| − | | |
| − | ===The Campaign Folder===
| |
| − | | |
| − | Like I told you earlier, all add-ons are installed in the data folder inside the userdata directory. That means that your campaign will also be located inside the data folder. If you're not already there, enter the data folder now.
| |
| − | | |
| − | Next, create a new folder inside the data folder. Name this new folder "my_campaign" exactly as I wrote it here (but don't include the quotation marks). Make sure you spelled it right, that you didn't accidentally capitalize any letters and that you included the underscore between "my" and "campaign" in the folder name, or your campaign won't work when you try and play it.
| |
| − | | |
| − | Now enter the "my_campaign" folder and create six new folders. Name these folders "images", "macros", "maps", "scenarios", "units" and "utils" (again, make sure you spelled everything right, that you didn't accidentally capitalize anything, and that you didn't include the quotation marks).
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| − | | |
| − | All campaigns share this common folder structure.
| |
| − | | |
| − | | |
| − | ==Chapter 3: The _main.cfg==
| |
| − | | |
| − | So we've created a campaign folder, but as of yet the game doesn't even know this new folder exists. In order for the game to find the folder, we have to send it a message every time the user loads the in-game campaign menu. That message will basically tell the game, "Yoo-hoo, I'm a campaign, here is the information you need to display me in the campaign menu, and this is where all the rest of my information is located in case the user tells you to load me!"
| |
| − | | |
| − | Navigate to your campaign folder, if you aren't already there. Now create a new text file and name it "_main.cfg" (just like that, including the underscore and without the quotes). Open the file in a text editor if you haven't already and add the following tagset:
| |
| − | | |
| − | [textdomain]
| |
| − | [/textdomain]
| |
| − | | |
| − | (explain text domain, add the name="wesnoth-my_first_campaign" and path="data/add-ons/my_first_campaign/translations" attributes
| |
| − | | |
| − | And now we're going to add the [campaign] tagset. Yes, it's our old friend, the [campaign] tagset, from Chapter 1. (need moar of wordz)
| |
| − | | |
| − | [campaign]
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| − | [/campaign]
| |
| − | | |
| − | (give the user a list of attributes to write, no values yet)
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| − | | |
| − | [campaign]
| |
| − | id=
| |
| − | name=
| |
| − | abbrev=
| |
| − | define=
| |
| − | icon=
| |
| − | image=
| |
| − | first_scenario=
| |
| − | description=
| |
| − | difficulties=
| |
| − | difficulty_descriptions=
| |
| − | [/campaign]
| |
| − | | |
| − | (describe the values of all attributes and why they are assigned, syntax etc.)
| |
| − | | |
| − | [campaign]
| |
| − | id=my_first_campaign
| |
| − | name= _ "My First Campaign"
| |
| − | abbrev= _ "MFC"
| |
| − | define=my_first_campaign
| |
| − | icon=
| |
| − | image=
| |
| − | first_scenario=my_first_scenario
| |
| − | description= _ "This is my first campaign."
| |
| − | difficulties=EASY
| |
| − | difficulty_descriptions=
| |
| − | [/campaign]
| |
| − | | |
| − | (discuss preprocessor directives, binary path, directory inclusion, etc.)
| |
| − | | |
| − | [binary_path]
| |
| − | path=data/add-ons/my_campaign/
| |
| − | [/binary_path]
| |
| − | | |
| − | (note: no units yet, save that for the adding custom units section)
| |
| − | | |
| − | | |
| − | | |
| − | ==Chapter 4: Creating Your First Scenario==
| |
| − | | |
| − | Now that you have your _main.cfg file, it's time to create your first scenario.
| |
| − | | |
| − | ===Creating the Scenario Map===
| |
| − | | |
| − | All scenarios require a map in order to work. Open the Battle for Wesnoth application. On the mainmenu, you should see an option labeled "Map Editor". Click this option and wait for the editor to load.
| |
| − | | |
| − | By default, Wesnoth creates a blank map with the dimensions 44 x 33 (43 wide and 33 tall). These dimensions will work fine for our purposes, so we won't change them. Hover your cursor over the map and look at the center of the upper edge of the Battle for Wesnoth application window. You should see two numbers separated by a comma.
| |
| − | | |
| − | (screenshot)
| |
| − | | |
| − | These numbers are the X and Y coordinates of the hex over which your cursor is currently hovering. If you move your cursor to another hex, the coordinates will change to show the new location of your cursor. This is a fast and convenient way to locate coordinates on the map.
| |
| − | | |
| − | So we have a map, but let's face it: it's rather dull and uninteresting. Time to add some new terrain. Locate the terrain palette (the area at the far right of your Battle for Wesnoth window that displays the terrains you can use in the editor).
| |
| − | | |
| − | (screenshot)
| |
| − | | |
| − | Towards the top of this window, you should see the terrain category selection buttons. From here you can change what category of terrain is displayed in the terrain palette.
| |
| − | | |
| − | (screenshot)
| |
| − | | |
| − | First, let's add a castle for the leader of the player's side to recruit from in the first scenario. Click on the "castle" terrain category button.
| |
| − | | |
| − | (screenshot of the castle terrain category button)
| |
| − | | |
| − | | |
| − | ===Creating the Scenario .cfg File===
| |
| − | | |
| − | Create a new text file in the "scenarios" folder inside your campaign folder. Name this new text file "my_first_scenario.cfg". Open the "my_first_scenario.cfg" file in your text editor, if you haven't already. Since it is a new file, it should be completely empty right now. It won't be when we're done with it, however!
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| − | | |
| − | First, let's add the [scenario] tagset:
| |
| − | | |
| − | [scenario]
| |
| − | [/scenario]
| |
| − | | |
| − | The [scenario] tagset is a toplevel tagset (i.e. it is not the child of any other tagset) and tells the game where the scenario begins and where it ends. All the information for your scenario goes within this tagset.
| |
| − | | |
| − | Next, inside the [scenario] tagset, include the following keys (don't forget to indent 4 spaces before each key):
| |
| − | id=
| |
| − | next_scenario=
| |
| − | name=
| |
| − | map_data=
| |
| − | turns=
| |
| − | | |
| − | Now the contents of the "my_first_scenario.cfg" file should look like this:
| |
| − | [scenario]
| |
| − | id=
| |
| − | next_scenario=
| |
| − | name=
| |
| − | map_data=
| |
| − | turns=
| |
| − | [/scenario]
| |
| − | | |
| − | We have provided keys for these attributes, so now it's time to assign them their values.
| |
| − | | |
| − | | |
| − | *'''The "id" Key'''
| |
| − | | |
| − | :Assign the value "my_first_scenario" to the "id" key, like so:
| |
| − | id=my_first_scenario
| |
| − | :Do you remember the value we assigned to the "first_scenario" key in the "_main.cfg" file? If you followed the instructions given in this tutorial, the value of that key should be "my_first_scenario". It is absolutely imperative that the value of the "first_scenario" key and the "id" key of the first scenario are exactly the same. If you misspelled either of them, introduced an incorrect capitalization into either of them, or made a typo of any kind in either of them, the game will return an error message when it tries to load the scenario. This is because the value of the "first_scenario" key refers to the id of your first scenario. If there is no scenario with an "id" key whose value exactly matches the value of the "first_scenario" key in the "_main.cfg", the game won't be able to find the first scenario and will tell you so by giving you an error message when you try to play your campaign.
| |
| − | | |
| − | | |
| − | *'''The "next_scenario" Key'''
| |
| − | | |
| − | :We are going to assign the value "null" to the "next_scenario" key. Example:
| |
| − | next_scenario=null
| |
| − | :The "next_scenario" key is a close cousin of the "first_scenario" key found in the "_main.cfg" file. Just as the "first_scenario" tells the game to look for a scenario with an id key whose value matches the value of the the "first_scenario" key, the "next_scenario" key tells the game which scenario to load after the player completes the current scenario. Just like with the "first_scenario" key, make sure the value of the "next_scenario" key exactly matches the id of the next scenario, otherwise you'll get an error message. If there is no next scenario, you would assign the value "null" to the "next_scenario" key, as we did here. This means that when the player completes the current scenario, the game knows that there is no next scenario to go to, and the campaign will end.
| |
| − | | |
| − | | |
| − | *'''The "name" Key'''
| |
| − | | |
| − | :For this attribute, we are going to give it this translatable string:
| |
| − | _ "My First Scenario."
| |
| − | As you should recall from our previous discussion about translatable strings, the value we give should be enclosed in double quotes and should have a whitespace, an underscore, and then another whitespace immediately before the first double quote. So now your "name" attribute should look like this:
| |
| − | name= _ "My First Scenario"
| |
| − | :Technically, the name of the scenario doesn't have to resemble the scenario's id at all. But it's a good idea to have the scenario id and the scenario name be as similar as possible to avoid any confusion later on.
| |
| − | | |
| − | | |
| − | *'''The "map_data" Key
| |
| − | | |
| − | :For this key, we are going to assign the value "{~add-ons/my_first_campaign/maps/my_first_map.map}". Now it should look like this:
| |
| − | map_data={~add-ons/my_first_campaign/maps/my_first_map.map}
| |
| − | | |
| − | | |
| − | *'''The "turns" Key'''
| |
| − | | |
| − | :We are going to assign the number "30" to this key:
| |
| − | | |
| − | turns=30
| |
| − | | |
| − | :This attribute specifies how many turns the player will have to complete the scenario. If the player does not complete the scenario objective before the turns run out, then the player will lose the scenario.
| |
| − | | |
| − | | |
| − | Now that we have assigned values to all our keys, the entire contents of the "my_first_scenario.cfg" file should now look like this:
| |
| − | [scenario]
| |
| − | id=my_first_scenario
| |
| − | next_scenario=null
| |
| − | name=_"My First Scenario."
| |
| − | map_data={~add-ons/my_first_campaign/maps/my_first_map.map}
| |
| − | turns=30
| |
| − | [/scenario]
| |
| − | | |
| − | | |
| − | | |
| − | ==Chapter 5: Events==
| |
| − | | |
| − | Let's walk through an average morning. When your alarm clock goes off, you wake up. You go downstairs and put some bread in the toaster for breakfast. When the toaster pops, you butter the toast and eat it. When you have eaten breakfast, you go outside and wait for the schoolbus to arrive. When the bus arrives, you get on it. When it stops at your destination, you get off of the bus.
| |
| − | | |
| − | Notice that you do everything “when” something else happens. These are all “events”. The alarm going off caused you to wake up. The toaster popping causes you to butter the toast and eat it. Finishing breakfast go outside. The bus stopping causes you to get on or off. These are all like events in WML.
| |
| − | | |
| − | ==Chapter 6: Building and Including a Custom Unit==
| |
| − | | |
| − | ==Chapter 7: Introduction to Variables==
| |
| − | | |
| − | Now it's time to learn about “variables”. Variables contain things. They're a lot like boxes that you'd use when moving to a new home. You put things in the boxes, and then you label them so that you can find the right things when unpacking later.
| |
| − | | |
| − | Like attributes, every variable has a name and a value. The name of the variable is like the label on the box, and the variable's value is the thing that the variable (or box) contains.
| |
| − | | |
| − | For instance, you might put all of your dishes in a box and label it “dishes”. Similarly you might create a variable named “my_name” and put your name inside of it. Then if you wanted to find your name later, you could look in the variable called “my_name”.
| |
| − | | |
| − | ===Creating Variables===
| |
| − | | |
| − | ===Referencing Variables===
| |
| − | | |
| − | ===Manipulating Variables===
| |
| − | | |
| − | ==Chapter 8: Scalar, Array, and Container Variables==
| |
| − | | |
| − | So far we have only discussed ''scalar variables'', i.e. variables that have only one variable. Believe it or not, there are types of variables than can store more than one value, or even other variables.
| |
| − | | |
| − | ===Scalar Variables===
| |
| − | | |
| − | ===Array Variables===
| |
| − | | |
| − | ===Container Variables===
| |
| − | | |
| − | Container variables are variables that contain other variables within themselves. Returning to the metaphor of boxes, let's say you had three small boxes, labeled "Apples", "Oranges", and "Pears", respectively. Instead of having to carry around three smaller boxes, wouldn't it be much easier if we could just put them all in one large box labeled "fruit"? Well, with container variables, you can!
| |
| − | | |
| − | Container variables are not restricted to containing scalar variables, however. They can also store array variables.
| |
| − | | |
| − | ==Chapter 9: Macros==
| |
| − | | |
| − | Have you ever needed to perform a task where you did the exact same thing several times? For instance, maybe you work at a cafe and you have three customers who want the exact same item: a (...)
| |
| − | | |
| − | There are also instances in programming where you need the computer to perform the exact same task multiple times. Each time you need the computer to perform that same task again, you have to write the same code again. There would be a lot of repetitious code. Wouldn't it be great if we could do that task multiple times without having to result to writing the code out multiple times? Well, with macros, you can.
| |
| − | | |
| − | You can think of macros as a special kind of variable. Just like you can store a long sentence in a variable and substitute it in several messages later on so that you don't have to write out the sentence several times, you can store WML code in a macro and simply call the macro wherever you would have to write all the code contained in the macro. When the scenario is loaded, the preprocessor will automatically substitute the code contained in the macro wherever the macro is called, for the duration of that scenario.
| |
| − | | |
| − | This can be a confusing topic, so let's illustrate with some actual WML examples. Here we have the noble leader and the hard-of-hearing stooge trying to formulate their battle plan at the start of the scenario:
| |
| − | | |
| − | [event]
| |
| − | name=start
| |
| − | [message]
| |
| − | speaker=Leader
| |
| − | message= _ "What do you think our plan should be, Stooge?"
| |
| − | [/message]
| |
| − | [message]
| |
| − | speaker=Stooge
| |
| − | message= _ "WHAT?"
| |
| − | [/message]
| |
| − | [message]
| |
| − | speaker=Leader
| |
| − | message= _ "I said, what do you think our battle plan should be?"
| |
| − | [/message]
| |
| − | [message]
| |
| − | speaker=Stooge
| |
| − | message= _ "WHAT?"
| |
| − | [/message]
| |
| − | [message]
| |
| − | speaker=Leader
| |
| − | message= _ "WHAT DO YOU THINK OUR BATTLE PLAN SHOULD BE?!"
| |
| − | [/message]
| |
| − | [message]
| |
| − | speaker=Stooge
| |
| − | message= _ "WHAT?"
| |
| − | [/message]
| |
| − | [message]
| |
| − | speaker=Leader
| |
| − | message= _ "Grrr..."
| |
| − | [/message]
| |
| − | [/event]
| |
| − | | |
| − | Notice how each time the leader says something, Stooge says the exact same thing: "WHAT?" Rather than having to write
| |
| − | [message]
| |
| − | speaker=Stooge
| |
| − | message= _ "WHAT?"
| |
| − | [/message]
| |
| − | three times, let's stick the code in a macro named "STOOGE_REPLY". Create a new text document in the "macros" folder inside your campaign folder. Name it "my_macros.cfg". Now open the file in a text editor (if you haven't already) and enter the following code:
| |
| − | | |
| − | #define STOOGE_REPLY
| |
| − | [message]
| |
| − | speaker=Stooge
| |
| − | message= _ "WHAT?"
| |
| − | [/message]
| |
| − | #enddef
| |
| − | | |
| − | Now save the file. Hooray, you have just created your first macro! Now go to the scenarios folder and open the "my_first_campaign"
| |
| − | | |
| − | ===The Parts of a Macro===
| |
| − | | |
| − | Macros consist of three elements: the macro preprocessor directives, the macro symbol, and the macro body.
| |
| − | | |
| − | ====The Macro Preprocessor Directives====
| |
| − | The macro preprocessor directives consist of the strings "#define" and "enddef". They tell the game where the macro begins and ends. Just like the preprocessor directives in the "_main.cfg" file, the macro preprocessor directives must be entirely lowercase and be spelled correctly.
| |
| − | | |
| − | ====The Macro Symbol====
| |
| − | The macro's symbol is the string of uppercase characters following the opening preprocessor directive that identifies the macro. Think of it as the macro's id. Symbols can only include alphanumeric characters and underscores, and should be capitalized throughout. In the case of the example above, the macro symbol would be:
| |
| − | STOOGE_REPLY
| |
| − | | |
| − | | |
| − | ====The Macro Body====
| |
| − | The macro body is the code that is contained in the macro. Everything between the preprocessor directives (with the exception of the macro symbol) is considered by the game to be the macro body. In this case, the macro body is:
| |
| − | [message]
| |
| − | speaker=Stooge
| |
| − | message= _ "WHAT?"
| |
| − | [/message]
| |
| − | | |
| − | ===Macro Arguments===
| |
| − | | |
| − | ==Chapter 10: Introduction to Logic==
| |
| − | | |
| − | ===If This, Then That===
| |
| − | | |
| − | Suppose you went to the grocery store to get some food. You park you car in the parking lot and begin to walk towards the store, when suddenly you realize that you can't remember if you shut the car door or not after you got out. You turn around to see if the car door is open...
| |
| − | | |
| − | ...and then what?
| |
| − | | |
| − | Well, if the car door is open, you know that you ''did'' forget to close it, so you go over and close it before you go into the grocery store. If the car door isn't open, there's no need for you to do anything, so you keep walking towards the store.
| |
| − | | |
| − | This kind of logic (called ''conditional'' logic) evaluates a condition and determines a reaction based on the state of that condition. In the example above, the condition is whether or not the car door is open. If it is open, then you go over and close it. If it isn't open, then you continue walking towards the store.
| |
| − | | |
| − | In WML you have a number of logical operations available to assess and react to conditions. The first one we will go over is the if/then operation. The syntax of this operations is:
| |
| − | | |
| − | [if]
| |
| − | (condition)
| |
| − | [then]
| |
| − | (do something)
| |
| − | [/then]
| |
| − | [/if]
| |
| − | | |
| − | ===Else===
| |
| − | | |
| − | With the if clause, if the condition is true then we do something. But what if the condition isn't true? Well, in the examples above the WML engine doesn't have anything to do if the condition isn't true, so it just keeps running. However, it is possible to make the game perform a task if the condition isn't true, which is done by using the tagset [else]. The syntax is:
| |
| − | | |
| − | [if]
| |
| − | (condition]
| |
| − | [then]
| |
| − | (do something)
| |
| − | [/then]
| |
| − | [else]
| |
| − | (do something else)
| |
| − | [/else]
| |
| − | [/if]
| |
| − | | |
| − | ==Chapter 11: More Logic: Cases and Loops==
| |
| − | | |
| − | ===Cases===
| |
| − | | |
| − | ===Loops===
| |
| − | | |
| − | ==Conclusion: Where to Go From Here==
| |
| − | | |
| − | As long and involved as this tutorial was, it barely scratches the surface of WML. You can't call yourself a WML expert just yet, but the hardest part for you — finding a starting point — is now over. You now know how to create a simple campaign, and you know many of the features WML has to offer.
| |
| − | | |
| − | One of the best ways to learn more WML (and one of the only ways before this tutorial ;) ) is to study the WML code of other add-ons. You can also research any tags you're not familiar with on the [http://wiki.wesnoth.org/ReferenceWML WML Reference], which is a complete reference to pretty much every element of WML.
| |
| − | | |
| − | If you run into any problems that you can't solve by looking at other people's code or by studying the wiki, post a message in the [http://forums.wesnoth.org/viewforum.php?f=21 WML Workshop forum]. The resident WML gurus will be happy to help you out if you ask politely.
| |
| | | | |
| | + | 2. Finish chapters 6-11 (Partially Complete) |
| | | | |
| − | You've been given the tools and the materials. Now go out and build something amazing!
| + | [[Category:WML_for_Complete_Beginners]] |