Stendhal Quest Coding - Part 2: Difference between revisions

Okay, enough theory for now, lets write some code:

<source lang="java">

public void prepareQuestStep() {

// get a reference to the Hayunn npc

SpeakerNPC npc = npcs.get("Hayunn Naratha");

// ...

// if the player asks for a quest, go to state QUEST_OFFERED

npc.add(ConversationStates.ATTENDING,

ConversationPhrases.QUEST_MESSAGES,

null,

ConversationStates.QUEST_OFFERED,

"My mouth is dry, but I can't be seen to abandon this teaching room! Could you bring me some beer from the tavern?",

null);

// in state QUEST_OFFERED, accept "yes" and go back to ATTENDING

npc.add(

ConversationStates.QUEST_OFFERED,

ConversationPhrases.YES_MESSAGES,

null,

ConversationStates.ATTENDING,

"Thanks! I'll be right here, waiting. And guarding, of course.",

null);

// in state QUEST_OFFERED, accept "no" and go back to ATTENDING

npc.add(

ConversationStates.QUEST_OFFERED,

ConversationPhrases.NO_MESSAGES,

null,

ConversationStates.ATTENDING,

"Oh, well forget it then. I guess I'll just hope for it to start raining, and then stand with my mouth open.",

null);

}

</source>

As you can see, we now have to use "add()" instead of "addReply()" and that methods has a lot more parameters.

We have predefined a number of states in the class [http://arianne.cvs.sf.net/viewvc/arianne/stendhal/src/games/stendhal/server/entity/npc/ConversationStates.java?view=markup ConverstationStates] that you can and should use.

There is one last thing that makes your life easier: If you are using Linux, have the graphviz package installed and you are an admin in game, you can select "View Transitions" in the right click menu of NPCs. This will generate an image of the current transition graph very similar to the images above.