- Joined
- Apr 14, 2008
- Messages
- 192
Magic of JASS
Jass can do many things for you. But what i find is that JASS is more
easy to learn than normal triggering.
JASS may seem hard to learn but its not you can aculy learn it very easy. I will
show you some code's and JASS scripts that show you what they do and how small they are. If you will like to learn JASS please contact me and i will send you a 2 page JASS learning Tutorial.
Sample code
The following function creates a string containing the message "Hello, world!" and displays it to all players:
or if you want this only for one player:
And if you want to print the message 100 times and show the iterator:
Here is some more stuff that has got to do with JASS codeing:
My target is to make a practical JASS course, since there are already plenty of theorical tutorias. I will purposely skip some stuff, remember that this is just to start in JASS, and after that you will have to see Open source JASS scripts and other Tutorials.
The only thing I will require for you is that you should already know how to extract files from a MPQ , search for that in the forums or google. But I don't want to ellaborate on that.
The first step is to open World Editor, create a new map and then open the trigger editor, select the trigger 'Map initialization' and you will most probably see this:
Time to get started, go to the edit menu and Convert It to custom text. press OK.
The first obstacle, what happened to the "This is a message" text?
TRIGSTR_004 , reffers to a string in war3map.wts (the map strings) you are able to edit that file with the World Editor's File\Export/Import Strings... commands. But for practical reasons we will forget about that and just use the text we like.
Here we will see 2 functions , Trig_JASS_test_Actions and InitTrig_JASS_test.
Each "Trigger" in the Trigger editor comes with a InitTrig_TRIGGERNAME (Spaces are replaced with _) function that is always called at the initialization of the map.
In this case we are talking about the InitTrig_JASS_test function. In the contents of that function we will see these lines:
For now we will say they are the Setup of a trigger that is saved under the gg_trg_JASS_test variable. A line to highlight is
It says that the action function for the gg_trg_JASS_test trigger is Trig_JASS_test_Actions. So for now the only thing we will do is editing the contents of that function , keep the other function with no changes.
We are now ready to start the course!
1. First Saving.
Save the map, it shouldn't give you errors unless you made a major mistake when replacing the contents of the message, double check it.
Most likely the message MUST be between quotes "" .
If it doesn't give you errors, Test the map using the Test Map button.
Now in game press Escape, it should show the "This is a message" text. This is the way we will test JASS for now.
2. Variables Tests
The syntax for making a local variable inside a function is the following:
local <VARIABLE TYPE> <VARIABLE NAME>
Optionally you can initiate the local variable with a value
local <VARIABLE TYPE> <VARIABLE NAME> = value
Variable names should not start with a number, and may only have alpha numeric characters and _
Strings
The first type we will use is string , a string is just text between "". The syntax does not care about what you use inside the string.
We will call the variable "a" .
It is time to say that JASS is case sensitive, so typing A is not the same as typing a , you can't use LOCAL nor Local for the declaration of the variable, you must use local.
In the example we just moved the message to the value of the variable named "a". When we used the variable in the Function that shows the message we didn't put it inside "".
Test the map, it should work the same way it worked before.
You can have multiple variables inside a function, but always make sure the declaration of the variables is before any other line.
What's the point of having 2 variables if we don't use the second one? Let us copy the Message function call to create another one. Then replace a with b
When you test the map it will show both messages.
Jass can do many things for you. But what i find is that JASS is more
easy to learn than normal triggering.
JASS may seem hard to learn but its not you can aculy learn it very easy. I will
show you some code's and JASS scripts that show you what they do and how small they are. If you will like to learn JASS please contact me and i will send you a 2 page JASS learning Tutorial.
Sample code
The following function creates a string containing the message "Hello, world!" and displays it to all players:
JASS:
function Trig_JASS_test_Actions takes nothing returns nothing
call DisplayTextToPlayer(GetLocalPlayer(), 0, 0, "Hello, world!")
endfunction
JASS:
function Trig_JASS_test_Actions takes player p returns nothing
call DisplayTextToPlayer(p, 0,0, "Hello, world!")
endfunction
JASS:
function Trig_JASS_test_Actions takes player p returns nothing
local integer i=0
loop
exitwhen i==100
call DisplayTextToPlayer(p, 0,0, "Hello, world! "+I2S(i))
set i=i+1
endloop
endfunctionHere is some more stuff that has got to do with JASS codeing:
My target is to make a practical JASS course, since there are already plenty of theorical tutorias. I will purposely skip some stuff, remember that this is just to start in JASS, and after that you will have to see Open source JASS scripts and other Tutorials.
The only thing I will require for you is that you should already know how to extract files from a MPQ , search for that in the forums or google. But I don't want to ellaborate on that.
The first step is to open World Editor, create a new map and then open the trigger editor, select the trigger 'Map initialization' and you will most probably see this:
-
Melee Initialization
-
Events
-
Map initialization
-
-
Conditions
-
Actions
-
Melee Game - Limit Heroes to 1 per Hero-type (for all players)
-
Melee Game - Give trained Heroes a Scroll of Town Portal (for all players)
-
Melee Game - Use melee time of day (for all players)
-
Melee Game - Set starting resources (for all players)
-
Melee Game - Remove creeps and critters from used start locations (for all players)
-
Melee Game - Create starting units (for all players)
-
Melee Game - Run melee AI scripts (for computer players)
-
Melee Game - Enforce victory/defeat conditions (for all players)
-
-
JASS:
JASS test
Events
Player - Player 1 (Red) skips a cinematic sequence
Conditions
Actions
Game - Display to (All players) the text: This is a message
JASS:
function Trig_JASS_test_Actions takes nothing returns nothing
call DisplayTextToForce( GetPlayersAll(), "TRIGSTR_004" )
endfunction
//===========================================================================
function InitTrig_JASS_test takes nothing returns nothing
set gg_trg_JASS_test = CreateTrigger( )
call TriggerRegisterPlayerEventEndCinematic( gg_trg_JASS_test, Player(0) )
call TriggerAddAction( gg_trg_JASS_test, function Trig_JASS_test_Actions )
endfunctionTRIGSTR_004 , reffers to a string in war3map.wts (the map strings) you are able to edit that file with the World Editor's File\Export/Import Strings... commands. But for practical reasons we will forget about that and just use the text we like.
JASS:
function Trig_JASS_test_Actions takes nothing returns nothing
call DisplayTextToForce( GetPlayersAll(), "This is a message" )
endfunction
//===========================================================================
function InitTrig_JASS_test takes nothing returns nothing
set gg_trg_JASS_test = CreateTrigger( )
call TriggerRegisterPlayerEventEndCinematic( gg_trg_JASS_test, Player(0) )
call TriggerAddAction( gg_trg_JASS_test, function Trig_JASS_test_Actions )
endfunctionHere we will see 2 functions , Trig_JASS_test_Actions and InitTrig_JASS_test.
Each "Trigger" in the Trigger editor comes with a InitTrig_TRIGGERNAME (Spaces are replaced with _) function that is always called at the initialization of the map.
In this case we are talking about the InitTrig_JASS_test function. In the contents of that function we will see these lines:
Code:
set gg_trg_JASS_test = CreateTrigger( )
call TriggerRegisterPlayerEventEndCinematic( gg_trg_JASS_test, Player(0) )
call TriggerAddAction( gg_trg_JASS_test, function Trig_JASS_test_Actions )
JASS:
call TriggerAddAction( gg_trg_JASS_test, function Trig_JASS_test_Actions )We are now ready to start the course!
1. First Saving.
Save the map, it shouldn't give you errors unless you made a major mistake when replacing the contents of the message, double check it.
Most likely the message MUST be between quotes "" .
If it doesn't give you errors, Test the map using the Test Map button.
Now in game press Escape, it should show the "This is a message" text. This is the way we will test JASS for now.
2. Variables Tests
The syntax for making a local variable inside a function is the following:
local <VARIABLE TYPE> <VARIABLE NAME>
Optionally you can initiate the local variable with a value
local <VARIABLE TYPE> <VARIABLE NAME> = value
Variable names should not start with a number, and may only have alpha numeric characters and _
Strings
The first type we will use is string , a string is just text between "". The syntax does not care about what you use inside the string.
We will call the variable "a" .
It is time to say that JASS is case sensitive, so typing A is not the same as typing a , you can't use LOCAL nor Local for the declaration of the variable, you must use local.
JASS:
function Trig_JASS_test_Actions takes nothing returns nothing
local string a="This is a message"
call DisplayTextToForce( GetPlayersAll(), a )
endfunctionTest the map, it should work the same way it worked before.
You can have multiple variables inside a function, but always make sure the declaration of the variables is before any other line.
JASS:
function Trig_JASS_test_Actions takes nothing returns nothing
local string a="This is a message"
local string b="This is other message"
call DisplayTextToForce( GetPlayersAll(), a )
endfunction
JASS:
function Trig_JASS_test_Actions takes nothing returns nothing
local string a="This is a message"
local string b="This is other message"
call DisplayTextToForce( GetPlayersAll(), a )
call DisplayTextToForce( GetPlayersAll(), b )
endfunction
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