JPaletteShower.java

/*
 * Copyright (c) 2007, 2016, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package com.sun.swingset3.demos.spinner;

import javax.swing.*;
import java.awt.*;

/**
 * @author Mikhail Lapshin
 */
public class JPaletteShower extends JComponent {

    private Palette palette;

    public JPaletteShower(Palette palette, int width, int height) {
        setPreferredSize(new Dimension(width, height));
        setMinimumSize(new Dimension(width, height));
        this.palette = palette;
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        int w = getSize().width;
        int h = getSize().height;
        int maxIndex = palette.getSize() - 1;
        double rate = (double) maxIndex / w;
        for (int x = 0; x < w; x++) {
            g.setColor(palette.getColor((int) (x * rate)));
            g.fillRect(x, 0, 1, h);
        }
    }

    public Palette getPalette() {
        return palette;
    }

    public void setPalette(Palette palette) {
        this.palette = palette;
        repaint();
    }
}