编辑“︁Stendhal NPC Coding”︁（章节）

== Define NPC with Java ==

First you need to decide what region your NPC will be in, so that we can create the Java file in the correct place. The location for the file will be:
 src/games/stendhal/server/maps/''region''/''subregion''

You should name the NPC file after the function of the NPC. Examples are GreeterNPC, HealerNPC, BuyerNPC, ChefNPC, SellerNPC, LifeguardNPC

In this example we'll make a wizard in a magician's hut.

So we will create a file <code>src/games/stendhal/server/maps/ados/magician_house/WizardNPC.java</code>

The start of the file will need to specify some standard things to make it work, don't worry about these just copy them for now. Notice that the ''class'' is the same as our ''filename'' and the ''package'' is related to where we put the file.

<source lang="java">
package games.stendhal.server.maps.ados.magician_house;

import games.stendhal.server.core.config.ZoneConfigurator;
import games.stendhal.server.core.engine.SingletonRepository;
import games.stendhal.server.core.engine.StendhalRPZone;
import games.stendhal.server.core.pathfinder.FixedPath;
import games.stendhal.server.core.pathfinder.Node;
// this one is just because our NPC is a seller
import games.stendhal.server.entity.npc.ShopList;
import games.stendhal.server.entity.npc.SpeakerNPC;
// this one is just because our NPC is a seller
import games.stendhal.server.entity.npc.behaviour.adder.SellerAdder;
// this one is just because our NPC is a seller
import games.stendhal.server.entity.npc.behaviour.impl.SellerBehaviour;

import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

public class WizardNPC implements ZoneConfigurator {
        // this is just because he has a 'shop' to sell potions
	private final ShopList shops = SingletonRepository.getShopList();

	/**
	 * Configure a zone.
	 *
	 * @param	zone		The zone to be configured.
	 * @param	attributes	Configuration attributes.
	 */
	public void configureZone(final StendhalRPZone zone, final Map<String, String> attributes) {
		buildNPC(zone);
	}

</source>

Now we have set up this standard stuff we can build the actual NPC. We'll call the method which builds the NPC, ''buildNPC''.

<source lang="java">
       private void buildNPC(final StendhalRPZone zone) {
    	    final SpeakerNPC npc = new SpeakerNPC("Mr Healer") {
            protected void createPath() {
                List<Node> nodes=new LinkedList<Node>();
                nodes.add(new Path.Node(9,5));
                nodes.add(new Path.Node(14,5));
                setPath(nodes,true);
            }

            protected void createDialog() {
                // Lets the NPC reply with "Hallo" when a player greets him. But we could have set a custom greeting inside the ()
                addGreeting();
                // Lets the NPC reply when a player says "job"
                addJob("I have healing abilities and I heal wounded players. I also sell #potions and antidotes.");
                // Lets the NPC reply when a player asks for help
                addHelp("Ask me to #heal you and I will help you or ask me #offer and I will show my shop's stuff.");
                // Makes the NPC sell potions and antidote
                addSeller(new SellerBehaviour(shops.get("healing")));
                // Lets the NPC heal players for free
                addHealer(0);
                // respond about a special trigger word
                addReply("potions","Please ask for my #offer.");
                // use standard goodbye, but you can also set one inside the ()
                addGoodbye();
            }
        });

        // This determines how the NPC will look like. welcomernpc.png is a picture in data/sprites/npc/
        npc.setEntityClass("welcomernpc");
        // set a description for when a player does 'Look'
        npc.setDescription("You see Mr Healer, he looks a a bit busy at the moment but perhaps he can help you anyway.");
        // Set the initial position to be the first node on the Path you defined above.
        npc.setPosition(9, 5);
        npc.initHP(100);

        zone.add(npc);   
    }
} 
</source>

The first thing defined is the name. The NPC is added to a list of NPCs so you can later fetch it for adding more dialogues for quests. So, it is very important to make sure the name you give to your NPC is unique.

Next define a path that the NPC will follow on that area. Just used your tiled map or walk around in game and check coordinates to choose your nodes. 
Each node is where the NPC turns. Make sure you right down every turning point and don't miss one (don't go from one corner, diagonally to another corner.)

You can also make the NPC stand still by using this instead:

<source lang="java">
    protected void createPath() {
        // NPC does not move
        setPath(null);
    }
</source>

In that case your NPC will stand still at whatever point you set as the initial position with <code>npc.setPosition(x, y);</code>.

And then create a dialog. Dialogs and such are explained in Quest sections, but you should find the example above covers most options and the options like addHelp are quite self-explanatory. There are:
:addGreeting
:addOffer
:addHelp
:addJob
:addQuest 
:addGoodbye
:addReply ''specify a '''trigger''' and a '''reply'''''

We set its outfit either by:
* setting its class to a [[StendhalRefactoringGraphics#NPCs|PNG image]] that exists at ''data/sprites/npc'', e.g. <code>npc.setEntityClass("welcomernpc");</code>
* setting its outfit with setOutfit method e.g. <code>npc.setOutfit(new Outfit(0, 05, 01, 06, 01));</code> - see [http://stendhalgame.org/hudson/job/stendhal_HEAD/javadoc/games/stendhal/server/entity/Outfit.html Outfit javadoc]

It is nice to set a description for when the player does ''Look''. If you don't set one, it will just say: ''You see [NPC Name].''

Finally set its initial position and its HP. Don't worry for your NPC. It can't be attacked nor killed. 

Once that is done add the NPC to zone using ''zone.add()'' method.