/*!
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program 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 Lesser General Public License for more details.
*
* Copyright (c) 2002-2013 Pentaho Corporation.. All rights reserved.
*/
package org.pentaho.reporting.libraries.designtime.swing.colorchooser;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import javax.swing.JComponent;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
public class RGBColorSelectorPanel extends JComponent
{
public enum ColorComponents
{
RED, GREEN, BLUE
}
private class MouseHandler extends MouseAdapter
{
private MouseHandler()
{
}
public void mouseClicked(final MouseEvent e)
{
handleMouse(e);
}
private void handleMouse(final MouseEvent e)
{
if (e.getButton() != MouseEvent.BUTTON1)
{
return;
}
if (getWidth() == 0 || getHeight() == 0)
{
return;
}
if (e.getX() > getWidth())
{
return;
}
if (e.getY() > getHeight())
{
return;
}
if (getWidth() == 0 || getHeight() == 0)
{
return;
}
if (colorSelectionModel == null)
{
return;
}
final float x = e.getX() / (float) getWidth();
final float y = (e.getY() / (float) getHeight());
final int color = computeColor(getSelectedComponent(), (int) (x * 255), (int) (y * 255));
colorSelectionModel.setSelectedColor(new Color(color));
}
public void mouseDragged(final MouseEvent e)
{
handleMouse(e);
}
}
private class ColorSelectionHandler implements ChangeListener
{
private ColorSelectionHandler()
{
}
public void stateChanged(final ChangeEvent e)
{
updateImage();
repaint();
}
}
private ColorSelectionHandler colorSelectionHandler;
private ExtendedColorModel colorSelectionModel;
private BufferedImage backend;
private ColorComponents component;
public RGBColorSelectorPanel()
{
backend = new BufferedImage(256, 256, BufferedImage.TYPE_INT_RGB);
component = ColorComponents.RED;
colorSelectionHandler = new ColorSelectionHandler();
addMouseListener(new MouseHandler());
addMouseMotionListener(new MouseHandler());
updateImage();
}
public ColorComponents getComponent()
{
return component;
}
public void setComponent(final ColorComponents component)
{
if (component == null)
{
throw new NullPointerException();
}
this.component = component;
updateImage();
repaint();
}
private int computeColor(final int selectedValue, final int x, final int y)
{
if (component == ColorComponents.RED)
{
return (selectedValue & 0xFF) << 16 | (y & 0xFF) << 8 | x & 0xFF;
}
if (component == ColorComponents.GREEN)
{
return (x & 0xFF) << 16 | (selectedValue & 0xFF) << 8 | y & 0xFF;
}
if (component == ColorComponents.BLUE)
{
return (x & 0xFF) << 16 | (y & 0xFF) << 8 | selectedValue & 0xFF;
}
throw new IllegalStateException();
}
private void updateImage()
{
final int selectedComponent = getSelectedComponent();
for (int x = 0; x < 256; x++)
{
for (int y = 0; y < 256; y++)
{
backend.setRGB(x, y, computeColor(selectedComponent, x, y));
}
}
}
private int getSelectedComponent()
{
final int selectedComponent;
final Color selectedValue = getSelectedColor();
if (selectedValue == null)
{
selectedComponent = 128;
}
else
{
switch (component)
{
case RED:
selectedComponent = selectedValue.getRed();
break;
case GREEN:
selectedComponent = selectedValue.getGreen();
break;
case BLUE:
selectedComponent = selectedValue.getBlue();
break;
default:
selectedComponent = 128;
}
}
return selectedComponent;
}
private Color getSelectedColor()
{
if (colorSelectionModel == null)
{
return null;
}
return colorSelectionModel.getSelectedColor();
}
public ExtendedColorModel getColorSelectionModel()
{
return colorSelectionModel;
}
public void setColorSelectionModel(final ExtendedColorModel colorSelectionModel)
{
if (this.colorSelectionModel != null)
{
this.colorSelectionModel.removeChangeListener(colorSelectionHandler);
}
this.colorSelectionModel = colorSelectionModel;
if (this.colorSelectionModel != null)
{
this.colorSelectionModel.addChangeListener(colorSelectionHandler);
}
repaint();
}
protected void paintComponent(final Graphics g)
{
g.drawImage(backend, 0, 0, getWidth(), getHeight(), this);
final Point color = computeSelectedPosition();
if (color != null)
{
final Color selectedColor = getSelectedColor();
final float[] floats = Color.RGBtoHSB
(selectedColor.getRed(), selectedColor.getGreen(), selectedColor.getBlue(), null);
floats[2] = 1 - floats[2];
floats[1] = 0;
final Graphics graphics = g.create();
graphics.setColor(Color.getHSBColor(floats[0], floats[1], floats[2]));
graphics.drawOval(color.x - 2, color.y - 2, 4, 4);
graphics.dispose();
}
}
private Point computeSelectedPosition()
{
final Color selectedColor = getSelectedColor();
if (selectedColor == null)
{
return null;
}
final float[] floats = selectedColor.getRGBColorComponents(null);
switch (component)
{
case RED:
return new Point((int) (floats[1] * getWidth()), (int) ((floats[2]) * getHeight()));
case GREEN:
return new Point((int) (floats[0] * getWidth()), (int) ((floats[2]) * getHeight()));
case BLUE:
return new Point((int) (floats[0] * getWidth()), (int) ((floats[1]) * getHeight()));
default:
return null;
}
}
public Dimension getPreferredSize()
{
return new Dimension(255, 255);
}
public Dimension getMinimumSize()
{
return new Dimension(255, 255);
}
}