/*
* @(#)ColorPickerPanel.java
*
* $Date: 2014-06-06 20:04:49 +0200 (P, 06 jún. 2014) $
*
* Copyright (c) 2011 by Jeremy Wood.
* All rights reserved.
*
* The copyright of this software is owned by Jeremy Wood.
* You may not use, copy or modify this software, except in
* accordance with the license agreement you entered into with
* Jeremy Wood. For details see accompanying license terms.
*
* This software is probably, but not necessarily, discussed here:
* https://javagraphics.java.net/
*
* That site should also contain the most recent official version
* of this software. (See the SVN repository for more details.)
*/
package com.bric.swing;
import com.bric.plaf.PlafPaintUtils;
import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.event.MouseInputAdapter;
import javax.swing.event.MouseInputListener;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Shape;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.geom.Ellipse2D;
import java.awt.image.BufferedImage;
import java.util.ArrayList;
import java.util.List;
import static com.bric.swing.ColorPicker.BLUE;
import static com.bric.swing.ColorPicker.BRI;
import static com.bric.swing.ColorPicker.GREEN;
import static com.bric.swing.ColorPicker.HUE;
import static com.bric.swing.ColorPicker.RED;
import static com.bric.swing.ColorPicker.SAT;
import static java.awt.RenderingHints.KEY_ANTIALIASING;
import static java.awt.RenderingHints.VALUE_ANTIALIAS_ON;
import static java.awt.image.BufferedImage.TYPE_INT_ARGB;
import static java.lang.Math.PI;
import static net.jafama.FastMath.cos;
import static net.jafama.FastMath.sin;
/**
* This is the large graphic element in the <code>ColorPicker</code>
* that depicts a wide range of colors.
* <P>This panel can operate in 6 different modes. In each mode a different
* property is held constant: hue, saturation, brightness, red, green, or blue.
* (Each property is identified with a constant in the <code>ColorPicker</code> class,
* such as: <code>ColorPicker.HUE</code> or <code>ColorPicker.GREEN</code>.)
* <P>In saturation and brightness mode, a wheel is used. Although it doesn't
* use as many pixels as a square does: it is a very aesthetic model since the hue can
* wrap around in a complete circle. (Also, on top of looks, this is how most
* people learn to think the color spectrum, so it has that advantage, too).
* In all other modes a square is used.
* <P>The user can click in this panel to select a new color. The selected color is
* highlighted with a circle drawn around it. Also once this
* component has the keyboard focus, the user can use the arrow keys to
* traverse the available colors.
* <P>Note this component is public and exists independently of the
* <code>ColorPicker</code> class. The only way this class is dependent
* on the <code>ColorPicker</code> class is when the constants for the modes
* are used.
* <P>The graphic in this panel will be based on either the width or
* the height of this component: depending on which is smaller.
*
* @see com.bric.swing.ColorPicker
* @see com.bric.swing.ColorPickerDialog
*/
public class ColorPickerPanel extends JPanel {
private static final long serialVersionUID = 1L;
/**
* The maximum size the graphic will be. No matter
* how big the panel becomes, the graphic will not exceed
* this length.
* <P>(This is enforced because only 1 BufferedImage is used
* to render the graphic. This image is created once at a fixed
* size and is never replaced.)
*/
public static final int MAX_SIZE = 325;
/**
* This controls how the colors are displayed.
*/
private int mode = BRI;
/**
* The point used to indicate the selected color.
*/
private Point point = new Point(0, 0);
private final List<ChangeListener> changeListeners = new ArrayList<>();
/* Floats from [0,1]. They must be kept distinct, because
* when you convert them to RGB coordinates HSB(0,0,0) and HSB (.5,0,0)
* and then convert them back to HSB coordinates, the hue always shifts back to zero.
*/
private float hue = -1;
private float sat = -1;
private float bri = -1;
private int red = -1;
private int green = -1;
private int blue = -1;
private int lastPressRed = -1;
private int lastPressGreen = -1;
private int lastPressBlue = -1;
// always true, except right after a mouse press or mouse release
private boolean adjusting = true;
private final MouseInputListener mouseListener = new MouseInputAdapter() {
@Override
public void mousePressed(MouseEvent e) {
change(e, false);
lastPressRed = red;
lastPressGreen = green;
lastPressBlue = blue;
adjusting = true;
}
private void change(MouseEvent e, boolean adjusting) {
ColorPickerPanel.this.adjusting = adjusting;
requestFocus();
Point p = e.getPoint();
if (mode == BRI || mode == SAT ||
mode == HUE) {
float[] hsb = getHSB(p);
setHSB(hsb[0], hsb[1], hsb[2]);
} else {
int[] rgb = getRGB(p);
setRGB(rgb[0], rgb[1], rgb[2]);
}
}
@Override
public void mouseDragged(MouseEvent e) {
change(e, true);
}
@Override
public void mouseReleased(MouseEvent e) {
adjusting = false;
// always fire, except if this was a click, and the
// color is the same as at mousePressed
if (lastPressRed != red || lastPressGreen != green || lastPressBlue != blue) {
fireChangeListeners();
}
adjusting = true;
}
};
public boolean isAdjusting() {
return adjusting;
}
private final KeyListener keyListener = new KeyAdapter() {
@Override
public void keyPressed(KeyEvent e) {
int dx = 0;
int dy = 0;
if (e.getKeyCode() == KeyEvent.VK_LEFT) {
dx = -1;
} else if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
dx = 1;
} else if (e.getKeyCode() == KeyEvent.VK_UP) {
dy = -1;
} else if (e.getKeyCode() == KeyEvent.VK_DOWN) {
dy = 1;
}
int multiplier = 1;
if (e.isShiftDown() && e.isAltDown()) {
multiplier = 10;
} else if (e.isShiftDown() || e.isAltDown()) {
multiplier = 5;
}
if (dx != 0 || dy != 0) {
int size = Math.min(MAX_SIZE, Math
.min(getWidth() - imagePadding.left - imagePadding.right, getHeight() - imagePadding.top - imagePadding.bottom));
int offsetX = getWidth() / 2 - size / 2;
int offsetY = getHeight() / 2 - size / 2;
mouseListener.mousePressed(new MouseEvent(ColorPickerPanel.this,
MouseEvent.MOUSE_PRESSED,
System.currentTimeMillis(), 0,
point.x + multiplier * dx + offsetX,
point.y + multiplier * dy + offsetY,
1, false
));
}
}
};
private final FocusListener focusListener = new FocusListener() {
@Override
public void focusGained(FocusEvent e) {
repaint();
}
@Override
public void focusLost(FocusEvent e) {
repaint();
}
};
private final BufferedImage image = new BufferedImage(MAX_SIZE, MAX_SIZE, TYPE_INT_ARGB);
/**
* Creates a new <code>ColorPickerPanel</code>
*/
public ColorPickerPanel() {
setMaximumSize(new Dimension(MAX_SIZE + imagePadding.left + imagePadding.right,
MAX_SIZE + imagePadding.top + imagePadding.bottom));
setPreferredSize(new Dimension((int) (MAX_SIZE * 0.75), (int) (MAX_SIZE * 0.75)));
setRGB(0, 0, 0);
addMouseListener(mouseListener);
addMouseMotionListener(mouseListener);
setFocusable(true);
addKeyListener(keyListener);
addFocusListener(focusListener);
setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));
addComponentListener(new ComponentAdapter() {
@Override
public void componentResized(ComponentEvent e) {
regeneratePoint();
regenerateImage();
}
});
}
/**
* This listener will be notified when the current HSB or RGB values
* change.
*/
public void addChangeListener(ChangeListener l) {
if (changeListeners.contains(l)) {
return;
}
changeListeners.add(l);
}
/**
* Remove a <code>ChangeListener</code> so it is no longer
* notified when the selected color changes.
*/
public void removeChangeListener(ChangeListener l) {
changeListeners.remove(l);
}
private void fireChangeListeners() {
if (changeListeners == null) {
return;
}
for (ChangeListener l : changeListeners) {
try {
l.stateChanged(new ChangeEvent(this));
} catch (RuntimeException e) {
e.printStackTrace();
}
}
}
private final Insets imagePadding = new Insets(6, 6, 6, 6);
@Override
public void paint(Graphics g) {
super.paint(g);
Graphics2D g2 = (Graphics2D) g;
int size = Math.min(MAX_SIZE,
Math.min(getWidth() - imagePadding.left - imagePadding.right,
getHeight() - imagePadding.top - imagePadding.bottom));
g2.translate(
getWidth() / 2 - size / 2,
getHeight() / 2 - size / 2);
g2.setRenderingHint(KEY_ANTIALIASING, VALUE_ANTIALIAS_ON);
Shape shape;
if (mode == SAT || mode == BRI) {
shape = new Ellipse2D.Float(0, 0, size, size);
} else {
Rectangle r = new Rectangle(0, 0, size, size);
shape = r;
}
if (hasFocus()) {
PlafPaintUtils.paintFocus(g2, shape, 3);
}
if (!(shape instanceof Rectangle)) {
//paint a circular shadow
g2.translate(2, 2);
g2.setColor(new Color(0, 0, 0, 20));
g2.fill(new Ellipse2D.Float(-2, -2, size + 4, size + 4));
g2.setColor(new Color(0, 0, 0, 40));
g2.fill(new Ellipse2D.Float(-1, -1, size + 2, size + 2));
g2.setColor(new Color(0, 0, 0, 80));
g2.fill(new Ellipse2D.Float(0, 0, size, size));
g2.translate(-2, -2);
}
g2.drawImage(image, 0, 0, size, size, 0, 0, size, size, null);
g2.setStroke(new BasicStroke(1));
if (shape instanceof Rectangle) {
Rectangle r = (Rectangle) shape;
PlafPaintUtils.drawBevel(g2, r);
} else {
g2.setColor(new Color(0, 0, 0, 120));
g2.draw(shape);
}
g2.setColor(Color.white);
g2.setStroke(new BasicStroke(1));
g2.draw(new Ellipse2D.Float(point.x - 3, point.y - 3, 6, 6));
g2.setColor(Color.black);
g2.draw(new Ellipse2D.Float(point.x - 4, point.y - 4, 8, 8));
g.translate(-imagePadding.left, -imagePadding.top);
}
/**
* Set the mode of this panel.
*
* @param mode This must be one of the following constants from the <code>ColorPicker</code> class:
* <code>HUE</code>, <code>SAT</code>, <code>BRI</code>, <code>RED</code>, <code>GREEN</code>, or <code>BLUE</code>
*/
public void setMode(int mode) {
if (!(mode == HUE || mode == SAT || mode == BRI ||
mode == RED || mode == GREEN || mode == BLUE)) {
throw new IllegalArgumentException("The mode must be HUE, SAT, BRI, RED, GREEN, or BLUE.");
}
if (this.mode == mode) {
return;
}
this.mode = mode;
regenerateImage();
regeneratePoint();
}
/**
* Sets the selected color of this panel.
* <P>If this panel is in HUE, SAT, or BRI mode, then
* this method converts these values to HSB coordinates
* and calls <code>setHSB</code>.
* <P>This method may regenerate the graphic if necessary.
*
* @param r the red value of the selected color.
* @param g the green value of the selected color.
* @param b the blue value of the selected color.
*/
public void setRGB(int r, int g, int b) {
if (r < 0 || r > 255) {
throw new IllegalArgumentException("The red value (" + r + ") must be between [0,255].");
}
if (g < 0 || g > 255) {
throw new IllegalArgumentException("The green value (" + g + ") must be between [0,255].");
}
if (b < 0 || b > 255) {
throw new IllegalArgumentException("The blue value (" + b + ") must be between [0,255].");
}
if (red != r || green != g || blue != b) {
if (mode == RED ||
mode == GREEN ||
mode == BLUE) {
int lastR = red;
int lastG = green;
int lastB = blue;
red = r;
green = g;
blue = b;
if (mode == RED) {
if (lastR != r) {
regenerateImage();
}
} else if (mode == GREEN) {
if (lastG != g) {
regenerateImage();
}
} else if (mode == BLUE) {
if (lastB != b) {
regenerateImage();
}
}
} else {
float[] hsb = new float[3];
Color.RGBtoHSB(r, g, b, hsb);
setHSB(hsb[0], hsb[1], hsb[2]);
return;
}
regeneratePoint();
repaint();
fireChangeListeners();
}
}
/**
* @return the HSB values of the selected color.
* Each value is between [0,1].
*/
public float[] getHSB() {
return new float[]{hue, sat, bri};
}
/**
* @return the RGB values of the selected color.
* Each value is between [0,255].
*/
public int[] getRGB() {
return new int[]{red, green, blue};
}
/**
* Returns the color at the indicated point in HSB values.
*
* @param p a point relative to this panel.
* @return the HSB values at the point provided.
*/
public float[] getHSB(Point p) {
if (mode == RED || mode == GREEN ||
mode == BLUE) {
int[] rgb = getRGB(p);
float[] hsb = Color.RGBtoHSB(rgb[0], rgb[1], rgb[2], null);
return hsb;
}
int size = Math.min(MAX_SIZE, Math
.min(getWidth() - imagePadding.left - imagePadding.right, getHeight() - imagePadding.top - imagePadding.bottom));
p.translate(-(getWidth() / 2 - size / 2), -(getHeight() / 2 - size / 2));
if (mode == BRI || mode == SAT) {
//the two circular views:
double radius = size / 2.0;
double x = p.getX() - size / 2.0;
double y = p.getY() - size / 2.0;
double r = Math.sqrt(x * x + y * y) / radius;
double theta = Math.atan2(y, x) / (PI * 2.0);
if (r > 1) {
r = 1;
}
if (mode == BRI) {
return new float[]{
(float) (theta + 0.25f),
(float) r,
bri};
} else {
return new float[]{
(float) (theta + 0.25f),
sat,
(float) r
};
}
} else {
float s = ((float) p.x) / ((float) size);
float b = ((float) p.y) / ((float) size);
if (s < 0) {
s = 0;
}
if (s > 1) {
s = 1;
}
if (b < 0) {
b = 0;
}
if (b > 1) {
b = 1;
}
return new float[]{hue, s, b};
}
}
/**
* Returns the color at the indicated point in RGB values.
*
* @param p a point relative to this panel.
* @return the RGB values at the point provided.
*/
public int[] getRGB(Point p) {
if (mode == BRI || mode == SAT ||
mode == HUE) {
float[] hsb = getHSB(p);
int rgb = Color.HSBtoRGB(hsb[0], hsb[1], hsb[2]);
int r = (rgb & 0xff0000) >> 16;
int g = (rgb & 0xff00) >> 8;
int b = (rgb & 0xff);
return new int[]{r, g, b};
}
int size = Math.min(MAX_SIZE, Math
.min(getWidth() - imagePadding.left - imagePadding.right, getHeight() - imagePadding.top - imagePadding.bottom));
p.translate(-(getWidth() / 2 - size / 2), -(getHeight() / 2 - size / 2));
int x2 = p.x * 255 / size;
int y2 = p.y * 255 / size;
if (x2 < 0) {
x2 = 0;
}
if (x2 > 255) {
x2 = 255;
}
if (y2 < 0) {
y2 = 0;
}
if (y2 > 255) {
y2 = 255;
}
if (mode == RED) {
return new int[]{red, x2, y2};
} else if (mode == GREEN) {
return new int[]{x2, green, y2};
} else {
return new int[]{x2, y2, blue};
}
}
/**
* Sets the selected color of this panel.
* <P>If this panel is in RED, GREEN, or BLUE mode, then
* this method converts these values to RGB coordinates
* and calls <code>setRGB</code>.
* <P>This method may regenerate the graphic if necessary.
*
* @param h the hue value of the selected color.
* @param s the saturation value of the selected color.
* @param b the brightness value of the selected color.
*/
public void setHSB(float h, float s, float b) {
//hue is cyclic: it can be any value
h = (float) (h - Math.floor(h));
if (s < 0 || s > 1) {
throw new IllegalArgumentException("The saturation value (" + s + ") must be between [0,1]");
}
if (b < 0 || b > 1) {
throw new IllegalArgumentException("The brightness value (" + b + ") must be between [0,1]");
}
if (hue != h || sat != s || bri != b) {
if (mode == HUE ||
mode == BRI ||
mode == SAT) {
float lastHue = hue;
float lastBri = bri;
float lastSat = sat;
hue = h;
sat = s;
bri = b;
if (mode == HUE) {
if (lastHue != hue) {
regenerateImage();
}
} else if (mode == SAT) {
if (lastSat != sat) {
regenerateImage();
}
} else if (mode == BRI) {
if (lastBri != bri) {
regenerateImage();
}
}
} else {
Color c = new Color(Color.HSBtoRGB(h, s, b));
setRGB(c.getRed(), c.getGreen(), c.getBlue());
return;
}
Color c = new Color(Color.HSBtoRGB(hue, sat, bri));
red = c.getRed();
green = c.getGreen();
blue = c.getBlue();
regeneratePoint();
repaint();
fireChangeListeners();
}
}
/**
* Recalculates the (x,y) point used to indicate the selected color.
*/
private void regeneratePoint() {
int size = Math.min(MAX_SIZE,
Math.min(getWidth() - imagePadding.left - imagePadding.right,
getHeight() - imagePadding.top - imagePadding.bottom));
if (mode == HUE || mode == SAT || mode == BRI) {
if (mode == HUE) {
point = new Point(
(int) (sat * size + 0.5),
(int) (bri * size + 0.5));
} else if (mode == SAT) {
double theta = hue * 2 * PI - PI / 2;
if (theta < 0) {
theta += 2 * PI;
}
double r = bri * size / 2;
point = new Point(
(int) (r * cos(theta) + 0.5 + size / 2.0),
(int) (r * sin(theta) + 0.5 + size / 2.0));
} else if (mode == BRI) {
double theta = hue * 2 * PI - PI / 2;
if (theta < 0) {
theta += 2 * PI;
}
double r = sat * size / 2;
point = new Point(
(int) (r * cos(theta) + 0.5 + size / 2.0),
(int) (r * sin(theta) + 0.5 + size / 2.0));
}
} else if (mode == RED) {
point = new Point(
(int) (green * size / 255.0f + 0.49f),
(int) (blue * size / 255.0f + 0.49f));
} else if (mode == GREEN) {
point = new Point(
(int) (red * size / 255.0f + 0.49f),
(int) (blue * size / 255.0f + 0.49f));
} else if (mode == BLUE) {
point = new Point(
(int) (red * size / 255.0f + 0.49f),
(int) (green * size / 255.0f + 0.49f));
}
}
/**
* A row of pixel data we recycle every time we regenerate this image.
*/
private final int[] row = new int[MAX_SIZE];
/**
* Regenerates the image.
*/
private synchronized void regenerateImage() {
int size = Math.min(MAX_SIZE,
Math.min(getWidth() - imagePadding.left - imagePadding.right,
getHeight() - imagePadding.top - imagePadding.bottom));
if (mode == BRI || mode == SAT) {
float bri2 = this.bri;
float sat2 = this.sat;
float radius = size / 2.0f;
float hue2;
float k = 1.2f; //the number of pixels to antialias
for (int y = 0; y < size; y++) {
float y2 = (y - size / 2.0f);
for (int x = 0; x < size; x++) {
float x2 = (x - size / 2.0f);
double theta = Math.atan2(y2, x2) - 3 * PI / 2.0;
if (theta < 0) {
theta += 2 * PI;
}
double r = Math.sqrt(x2 * x2 + y2 * y2);
if (r <= radius) {
if (mode == BRI) {
hue2 = (float) (theta / (2 * PI));
sat2 = (float) (r / radius);
} else { //SAT
hue2 = (float) (theta / (2 * PI));
bri2 = (float) (r / radius);
}
row[x] = Color.HSBtoRGB(hue2, sat2, bri2);
if (r > radius - k) {
int alpha = (int) (255 - 255 * (r - radius + k) / k);
if (alpha < 0) {
alpha = 0;
}
if (alpha > 255) {
alpha = 255;
}
row[x] = row[x] & 0xffffff + (alpha << 24);
}
} else {
row[x] = 0x00000000;
}
}
image.getRaster().setDataElements(0, y, size, 1, row);
}
} else if (mode == HUE) {
float hue2 = this.hue;
for (int y = 0; y < size; y++) {
float y2 = ((float) y) / ((float) size);
for (int x = 0; x < size; x++) {
float x2 = ((float) x) / ((float) size);
row[x] = Color.HSBtoRGB(hue2, x2, y2);
}
image.getRaster().setDataElements(0, y, image.getWidth(), 1, row);
}
} else { //mode is RED, GREEN, or BLUE
int red2 = red;
int green2 = green;
int blue2 = blue;
for (int y = 0; y < size; y++) {
float y2 = ((float) y) / ((float) size);
for (int x = 0; x < size; x++) {
float x2 = ((float) x) / ((float) size);
if (mode == RED) {
green2 = (int) (x2 * 255 + 0.49);
blue2 = (int) (y2 * 255 + 0.49);
} else if (mode == GREEN) {
red2 = (int) (x2 * 255 + 0.49);
blue2 = (int) (y2 * 255 + 0.49);
} else {
red2 = (int) (x2 * 255 + 0.49);
green2 = (int) (y2 * 255 + 0.49);
}
row[x] = 0xFF000000 + (red2 << 16) + (green2 << 8) + blue2;
}
image.getRaster().setDataElements(0, y, size, 1, row);
}
}
repaint();
}
}
