Scripting questions

[cyan3]

Originally Posted by iDigzy

Hi, I recently started scripting GS2 and I have a few questions.
1. What are classes for, like difference between weapons?
2. What is the point of npc's option when you can add npc's in level editor? Is it the same?
3. For setting things for a player, for example the hat or head would the script be something like player.attr1 = "filename"?
4. Are there any "and" or "or" words that can be used in an if statement? For example, a script like
function onPlayerchats() {
if (player.chat = "hello") *could you put an "and" or an "or" comparison here?* {
player.chat = "hi"
}

Classes are used to minimize code reuse and helps improve debugging/maintenance of your code as you'd only have to edit the single class to apply the changes to every script that uses that class. For example, you could have a class that handles damage which could then be called from any weapon script when you need to cause damage to a player instead of rewriting that same code in every weapon script.

It would be player.attr[1] = "filename";

and is && and or is ||

For example:

PHP Code:

function onPlayerChats() {

    if (player.chat == "hello" || player.chat == "bye") {

        player.chat = "hi";
    }
} 


Also if you are checking a value is equal to something please use the == operator instead of =, Although both work in GS2 it is good practice to use == for equality and = for assignment.

[callimuc]

1. Like cyan said, with classes you don't need to copy and paste the same function all the time for every script, meaning if you got a bug and you fix it inside a class, that will do the change to every script being joined to that class -> you don't need to find all the weapons/npcs and update them manually.

2. DB NPCs are used to store information. Lets say you got something like:

PHP Code:

function onPlayerTouchsMe() {
  if (!(player.account in this.playersThatTouchedMe)) {
    this.playersThatTouchedMe.add(player.account);
  }
} 


Inside a normal NPCs, the this.playersThatTouchedMe array would reset everytime you update/edit the level. with a DB NPC this would still be saved as a flag.

3. To change a players hat, you need to change the players attr[1] (player.attr[1] = "hat image file";) and for the players head, you need to set the player.head = "head image file"; (for trial users its limited to head0.png to head15.png, maybe even just head10.png).

4. Using && will get you the option to see if the 2nd statement is also true, while using || will check if either one of the statements is true

The or check:

PHP Code:

function onPlayerTouchsMe() {
    //check if 'player.account' is either 'Stefan' or 'Unixmad'
  if (player.account == "Stefan" || player.account == "Unixmad") {
    player.chat = "Hey I'm Stefan or Unixmad";
  }
} 


Basically the same as

PHP Code:

function onPlayerTouchsMe() {
  if (player.account == "Stefan") {
    player.chat = "Hey I'm Stefan or Unixmad";
  }
  else if (player.account == "Unixmad") {
    player.chat = "Hey I'm Stefan or Unixmad";
  }
} 


The and check:

PHP Code:

function onPlayerTouchsMe() {
    //check if 'player.account' is 'Stefan' and if he is wearing the 'head0.png' head
  if (player.account == "Stefan" && player.head == "head0.png") {
    player.chat = "Hey I'm Stefan wearing the head0.png!!";
  }
} 


Basically the same as:

PHP Code:

function onPlayerTouchsMe() {
    //check if 'player.account' is 'Stefan' and if he is wearing the 'head0.png' head
  if (player.account == "Stefan") {
    if (player.head == "head0.png") {
      player.chat = "Hey I'm Stefan wearing the head0.png!!";
    }
  }
} 


[iDigzy]

So a class is kind of like a variable, where it has code that you can just type the class file instead of re-entering all the code?
Thanks for all the answers btw