FlowSpreadStyle.java

package Roguelike.Fields.SpreadStyle;

import Roguelike.Global.Direction;
import Roguelike.Global.Passability;
import Roguelike.Fields.Field;
import Roguelike.Tiles.GameTile;
import Roguelike.Util.EnumBitflag;

import com.badlogic.gdx.utils.Array;
import com.badlogic.gdx.utils.XmlReader.Element;

public class FlowSpreadStyle extends AbstractSpreadStyle
{
	private EnumBitflag<Passability> travelType;
	private float updateRate;

	@Override
	public void update( float delta, Field field )
	{
		float updateAccumulator = (Float) field.getData( "SpreadAccumulator", 0.0f );

		updateAccumulator += delta;

		while ( updateAccumulator >= updateRate && field.stacks > 1 )
		{
			updateAccumulator -= updateRate;

			Array<GameTile> validTiles = new Array<GameTile>();
			for ( Direction dir : Direction.values() )
			{
				GameTile tile = field.tile.level.getGameTile( field.tile.x + dir.getX(), field.tile.y + dir.getY() );

				if (tile == null)
				{
					continue;
				}

				Field tileField = tile.fields.get( field.layer );
				if ( tileField != null && tileField.fieldName.equals( field.fieldName ) )
				{
					// same field, only flow down the gradient
					if ( tileField.stacks < field.stacks )
					{
						validTiles.add( tile );
					}
				}
				else if ( tile.getPassable( travelType, null ) )
				{
					validTiles.add( tile );
				}
			}

			if ( validTiles.size > 0 )
			{
				GameTile newTile = validTiles.random();
				field.trySpawnInTile( newTile, 1 );
				field.stacks--;
			}
		}

		field.setData( "SpreadAccumulator", updateAccumulator );
	}

	@Override
	public void parse( Element xml )
	{
		updateRate = xml.getFloat( "Update", 0.5f );
		travelType = Passability.parseArray( xml.get( "TravelType", "Walk,Entity" ) );
	}
}