DarknessColors.java

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/*
 * This file is part of JXClient, the Fullscreen Java Crossfire Client.
 *
 * JXClient 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.
 *
 * JXClient is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with JXClient; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Copyright (C) 2005-2008 Yann Chachkoff
 * Copyright (C) 2006-2017,2019-2023 Andreas Kirschbaum
 * Copyright (C) 2010-2012,2014-2018,2020-2023 Nicolas Weeger
 */
 
package com.realtime.crossfire.jxclient.gui.map;
 
import com.realtime.crossfire.jxclient.map.CfMapSquare;
import java.awt.Color;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
 
public class DarknessColors {
 
    private static final float MAX_DARKNESS_ALPHA = 0.7F;
 
    @NotNull
    public static final Color FOG_OF_WAR_COLOR = new Color(0, 0, 0.5F, 0.5F);
 
    @NotNull
    public static final Color BLACK_AND_FOG_OF_WAR_COLOR = new Color(0, 0, 0.25F, 1.0F);
 
    @Nullable
    private final Color @NotNull [] darknessColors = new Color[256];
 
    @NotNull
    public Color getDarknessColor(final int darkness) {
        synchronized (darknessColors) {
            if (darknessColors[darkness] == null) {
                final float alpha = MAX_DARKNESS_ALPHA*(CfMapSquare.DARKNESS_FULL_BRIGHT-darkness)/CfMapSquare.DARKNESS_FULL_BRIGHT;
                darknessColors[darkness] = new Color(0, 0, 0, alpha);
            }
 
            //noinspection ConstantConditions
            return darknessColors[darkness];
        }
    }
 
}