001/* 002 * $Id: GradientTrackRenderer.java 4082 2011-11-15 18:39:43Z kschaefe $ 003 * 004 * Copyright 2004 Sun Microsystems, Inc., 4150 Network Circle, 005 * Santa Clara, California 95054, U.S.A. All rights reserved. 006 * 007 * This library is free software; you can redistribute it and/or 008 * modify it under the terms of the GNU Lesser General Public 009 * License as published by the Free Software Foundation; either 010 * version 2.1 of the License, or (at your option) any later version. 011 * 012 * This library is distributed in the hope that it will be useful, 013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 015 * Lesser General Public License for more details. 016 * 017 * You should have received a copy of the GNU Lesser General Public 018 * License along with this library; if not, write to the Free Software 019 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 020 */ 021package org.jdesktop.swingx.color; 022 023import java.awt.Color; 024import java.awt.Graphics; 025import java.awt.Graphics2D; 026import java.awt.LinearGradientPaint; 027import java.awt.MultipleGradientPaint; 028import java.awt.Paint; 029import java.awt.Rectangle; 030import java.awt.geom.Point2D; 031import java.awt.geom.Rectangle2D; 032import java.util.List; 033 034import javax.swing.JComponent; 035 036import org.jdesktop.swingx.JXMultiThumbSlider; 037import org.jdesktop.swingx.multislider.Thumb; 038import org.jdesktop.swingx.multislider.TrackRenderer; 039import org.jdesktop.swingx.util.PaintUtils; 040 041/** 042 * <p><b>Dependency</b>: Because this class relies on LinearGradientPaint and 043 * RadialGradientPaint, it requires the optional MultipleGradientPaint.jar</p> 044 */ 045public class GradientTrackRenderer extends JComponent implements TrackRenderer { 046 private Paint checker_paint; 047 048 public GradientTrackRenderer() { 049 checker_paint = PaintUtils.getCheckerPaint(); 050 } 051 052 private JXMultiThumbSlider slider; 053 054 @Override 055 public void paint(Graphics g) { 056 super.paint(g); 057 paintComponent(g); 058 } 059 060 @Override 061 protected void paintComponent(Graphics gfx) { 062 Graphics2D g = (Graphics2D)gfx; 063 064 // get the list of colors 065 List<Thumb<Color>> stops = slider.getModel().getSortedThumbs(); 066 int len = stops.size(); 067 068 // set up the data for the gradient 069 float[] fractions = new float[len]; 070 Color[] colors = new Color[len]; 071 int i = 0; 072 for(Thumb<Color> thumb : stops) { 073 colors[i] = (Color)thumb.getObject(); 074 fractions[i] = thumb.getPosition(); 075 i++; 076 } 077 078 // calculate the track area 079 int thumb_width = 12; 080 int track_width = slider.getWidth() - thumb_width; 081 g.translate(thumb_width / 2, 12); 082 Rectangle2D rect = new Rectangle(0, 0, track_width, 20); 083 084 // fill in the checker 085 g.setPaint(checker_paint); 086 g.fill(rect); 087 088 // fill in the gradient 089 Point2D start = new Point2D.Float(0,0); 090 Point2D end = new Point2D.Float(track_width,0); 091 MultipleGradientPaint paint = new LinearGradientPaint( 092 (float)start.getX(), 093 (float)start.getY(), 094 (float)end.getX(), 095 (float)end.getY(), 096 fractions,colors); 097 g.setPaint(paint); 098 g.fill(rect); 099 100 // draw a border 101 g.setColor(Color.black); 102 g.draw(rect); 103 g.translate(-thumb_width / 2, -12); 104 } 105 106 public JComponent getRendererComponent(JXMultiThumbSlider slider) { 107 this.slider = slider; 108 return this; 109 } 110}