/*
* Tiled Map Editor, (c) 2004-2006
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Adam Turk <aturk@biggeruniverse.com>
* Bjorn Lindeijer <bjorn@lindeijer.nl>
*/
package tiled.mapeditor.brush;
import java.awt.geom.Area;
import org.eclipse.swt.graphics.Rectangle;
import tiled.core.MultilayerPlane;
import tiled.core.TileLayer;
import tiled.util.Converter;
import tiled.util.MersenneTwister;
/**
* @version $Id$
*/
public class RandomBrush extends ShapeBrush
{
private final MersenneTwister mt;
private double ratio = 0.5;
public RandomBrush(Area shape) {
super(shape);
mt = new MersenneTwister(System.currentTimeMillis());
}
public RandomBrush(AbstractBrush sb) {
super(sb);
mt = new MersenneTwister(System.currentTimeMillis());
if (sb instanceof RandomBrush) {
ratio = ((RandomBrush)sb).ratio;
}
}
public void setRatio(double r) {
ratio = r;
}
public double getRatio() {
return ratio;
}
/**
* Uses the MersenneTwister to fill in a random amount of the area
* of the brush. Uses the formula: x % 101 <= 100*ratio where, 'x'
* is a random number, to determine if a specific tile should be
* painted or not
*
* @see ShapeBrush#doPaint
* @return a Rectangle of the bounds of the area that was modified
* @param x The x-coordinate where the click occurred.
* @param y The y-coordinate where the click occurred.
*/
public Rectangle doPaint(int x, int y)
{
Rectangle shapeBounds = Converter.AWTRectToSWT(shape.getBounds());
int centerx = x - shapeBounds.width / 2;
int centery = y - shapeBounds.height / 2;
for (int i = 0; i < numLayers; i++) {
TileLayer tl = (TileLayer) affectedMp.getLayer(initLayer - i);
if (tl != null) {
for (int cy = 0; cy <= shapeBounds.height; cy++) {
for (int cx = 0; cx < shapeBounds.width; cx++) {
if (shape.contains(cx, cy) &&
mt.genrand() % 101 <= 100 * ratio)
{
tl.setTileAt(
cx + centerx, cy + centery, paintTile);
}
}
}
}
}
return new Rectangle(
centerx, centery, shapeBounds.width, shapeBounds.height);
}
}