package greenfoot.core;

import greenfoot.Actor;
import greenfoot.World;
import greenfoot.WorldVisitor;

import java.awt.Point;




| A helper class which can be instantiated to fetch a reference to the
| actor at a particular mouse location, where the user has left/right-clicked
| in the interface.  If the location is outside the world, or there are no
| actors at that point, the world is picked instead.
|
public class PickActorHelper
{       

   
   public Actor[] actorPicks;
   
   
   public World worldPick;
   
   public int pickId;

   
   


| Finds an actor at the given location.  If the location is invalid
| or there are no actors there, the world is picked instead.
|
| @param sx       The x pixel coordinate in the world (will be an integer)
| @param sy       The y pixel coordinate in the world (will be an integer)
| @param spickId  The pick request ID
| @param requestType  The request type.  If "drag", a drag on that actor will begin.
|*/
   
   public PickActorHelper(String sx, String sy, String spickId, String requestType)
   {
      int x = Integer.parseInt(sx);
      int y = Integer.parseInt(sy);
|
|int pickId = Integer.parseInt(spickId);
|
|Simulation.getInstance().runLater(() -> {
|
|// The fields must be up to date and valid at the point we call picked():
|
|WorldHandler worldHandler = WorldHandler.getInstance();
|
|this.worldPick = worldHandler.getWorld();
|
|if (worldPick != null && x >= 0 && x < WorldVisitor.getWidthInPixels(worldPick)
|
|&& y >= 0 && y < WorldVisitor.getHeightInPixels(worldPick))
|
|{
|
|this.actorPicks = WorldVisitor.getObjectsAtPixel(this.worldPick, x, y).toArray(new Actor[0]);
|
|}
|
|else
|
|{
|
|this.actorPicks = new Actor[0];
|
|}
|
|this.pickId = pickId;
|
|if ("drag".equals(requestType))
           {                
         // If there are any actors at that point, drag the topmost one:
         if (actorPicks.length > 0)
               {                    
            // The top-most actor is actually the last in the list:
|
|Actor topMost = actorPicks[actorPicks.length - 1];
|
|worldHandler.startDrag(topMost, new Point(x, y), this.pickId);
|
|}
|
|}
|
|picked();
|
|});
|
|}
|
|/**
| A special method which will have a breakpoint set by GreenfootDebugHandler.  Do
| not remove/inline/rename without also editing that class.
|
public void picked()
   {        
        
   } 
}