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Color.java
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1244 lines (1165 loc) · 43.1 KB
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/*
* Copyright (c) 1995, 2013, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
*
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*/
package java.awt;
import java.beans.ConstructorProperties;
import java.awt.image.ColorModel;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;
import java.awt.color.ColorSpace;
/**
* The <code>Color</code> class is used to encapsulate colors in the default
* sRGB color space or colors in arbitrary color spaces identified by a
* {@link ColorSpace}. Every color has an implicit alpha value of 1.0 or
* an explicit one provided in the constructor. The alpha value
* defines the transparency of a color and can be represented by
* a float value in the range 0.0 - 1.0 or 0 - 255.
* An alpha value of 1.0 or 255 means that the color is completely
* opaque and an alpha value of 0 or 0.0 means that the color is
* completely transparent.
* When constructing a <code>Color</code> with an explicit alpha or
* getting the color/alpha components of a <code>Color</code>, the color
* components are never premultiplied by the alpha component.
* <p>
* The default color space for the Java 2D(tm) API is sRGB, a proposed
* standard RGB color space. For further information on sRGB,
* see <A href="http://www.w3.org/pub/WWW/Graphics/Color/sRGB.html">
* http://www.w3.org/pub/WWW/Graphics/Color/sRGB.html
* </A>.
* <p>
* @version 10 Feb 1997
* @author Sami Shaio
* @author Arthur van Hoff
* @see ColorSpace
* @see AlphaComposite
*/
public class Color implements Paint, java.io.Serializable {
/**
* The color white. In the default sRGB space.
*/
public final static Color white = new Color(255, 255, 255);
/**
* The color white. In the default sRGB space.
* @since 1.4
*/
public final static Color WHITE = white;
/**
* The color light gray. In the default sRGB space.
*/
public final static Color lightGray = new Color(192, 192, 192);
/**
* The color light gray. In the default sRGB space.
* @since 1.4
*/
public final static Color LIGHT_GRAY = lightGray;
/**
* The color gray. In the default sRGB space.
*/
public final static Color gray = new Color(128, 128, 128);
/**
* The color gray. In the default sRGB space.
* @since 1.4
*/
public final static Color GRAY = gray;
/**
* The color dark gray. In the default sRGB space.
*/
public final static Color darkGray = new Color(64, 64, 64);
/**
* The color dark gray. In the default sRGB space.
* @since 1.4
*/
public final static Color DARK_GRAY = darkGray;
/**
* The color black. In the default sRGB space.
*/
public final static Color black = new Color(0, 0, 0);
/**
* The color black. In the default sRGB space.
* @since 1.4
*/
public final static Color BLACK = black;
/**
* The color red. In the default sRGB space.
*/
public final static Color red = new Color(255, 0, 0);
/**
* The color red. In the default sRGB space.
* @since 1.4
*/
public final static Color RED = red;
/**
* The color pink. In the default sRGB space.
*/
public final static Color pink = new Color(255, 175, 175);
/**
* The color pink. In the default sRGB space.
* @since 1.4
*/
public final static Color PINK = pink;
/**
* The color orange. In the default sRGB space.
*/
public final static Color orange = new Color(255, 200, 0);
/**
* The color orange. In the default sRGB space.
* @since 1.4
*/
public final static Color ORANGE = orange;
/**
* The color yellow. In the default sRGB space.
*/
public final static Color yellow = new Color(255, 255, 0);
/**
* The color yellow. In the default sRGB space.
* @since 1.4
*/
public final static Color YELLOW = yellow;
/**
* The color green. In the default sRGB space.
*/
public final static Color green = new Color(0, 255, 0);
/**
* The color green. In the default sRGB space.
* @since 1.4
*/
public final static Color GREEN = green;
/**
* The color magenta. In the default sRGB space.
*/
public final static Color magenta = new Color(255, 0, 255);
/**
* The color magenta. In the default sRGB space.
* @since 1.4
*/
public final static Color MAGENTA = magenta;
/**
* The color cyan. In the default sRGB space.
*/
public final static Color cyan = new Color(0, 255, 255);
/**
* The color cyan. In the default sRGB space.
* @since 1.4
*/
public final static Color CYAN = cyan;
/**
* The color blue. In the default sRGB space.
*/
public final static Color blue = new Color(0, 0, 255);
/**
* The color blue. In the default sRGB space.
* @since 1.4
*/
public final static Color BLUE = blue;
/**
* The color value.
* @serial
* @see #getRGB
*/
int value;
/**
* The color value in the default sRGB <code>ColorSpace</code> as
* <code>float</code> components (no alpha).
* If <code>null</code> after object construction, this must be an
* sRGB color constructed with 8-bit precision, so compute from the
* <code>int</code> color value.
* @serial
* @see #getRGBColorComponents
* @see #getRGBComponents
*/
private float frgbvalue[] = null;
/**
* The color value in the native <code>ColorSpace</code> as
* <code>float</code> components (no alpha).
* If <code>null</code> after object construction, this must be an
* sRGB color constructed with 8-bit precision, so compute from the
* <code>int</code> color value.
* @serial
* @see #getRGBColorComponents
* @see #getRGBComponents
*/
private float fvalue[] = null;
/**
* The alpha value as a <code>float</code> component.
* If <code>frgbvalue</code> is <code>null</code>, this is not valid
* data, so compute from the <code>int</code> color value.
* @serial
* @see #getRGBComponents
* @see #getComponents
*/
private float falpha = 0.0f;
/**
* The <code>ColorSpace</code>. If <code>null</code>, then it's
* default is sRGB.
* @serial
* @see #getColor
* @see #getColorSpace
* @see #getColorComponents
*/
private ColorSpace cs = null;
/*
* JDK 1.1 serialVersionUID
*/
private static final long serialVersionUID = 118526816881161077L;
/**
* Initialize JNI field and method IDs
*/
private static native void initIDs();
static {
/** 4112352 - Calling getDefaultToolkit()
** here can cause this class to be accessed before it is fully
** initialized. DON'T DO IT!!!
**
** Toolkit.getDefaultToolkit();
**/
/* ensure that the necessary native libraries are loaded */
Toolkit.loadLibraries();
if (!GraphicsEnvironment.isHeadless()) {
initIDs();
}
}
/**
* Checks the color integer components supplied for validity.
* Throws an {@link IllegalArgumentException} if the value is out of
* range.
* @param r the Red component
* @param g the Green component
* @param b the Blue component
**/
private static void testColorValueRange(int r, int g, int b, int a) {
boolean rangeError = false;
String badComponentString = "";
if ( a < 0 || a > 255) {
rangeError = true;
badComponentString = badComponentString + " Alpha";
}
if ( r < 0 || r > 255) {
rangeError = true;
badComponentString = badComponentString + " Red";
}
if ( g < 0 || g > 255) {
rangeError = true;
badComponentString = badComponentString + " Green";
}
if ( b < 0 || b > 255) {
rangeError = true;
badComponentString = badComponentString + " Blue";
}
if ( rangeError == true ) {
throw new IllegalArgumentException("Color parameter outside of expected range:"
+ badComponentString);
}
}
/**
* Checks the color <code>float</code> components supplied for
* validity.
* Throws an <code>IllegalArgumentException</code> if the value is out
* of range.
* @param r the Red component
* @param g the Green component
* @param b the Blue component
**/
private static void testColorValueRange(float r, float g, float b, float a) {
boolean rangeError = false;
String badComponentString = "";
if ( a < 0.0 || a > 1.0) {
rangeError = true;
badComponentString = badComponentString + " Alpha";
}
if ( r < 0.0 || r > 1.0) {
rangeError = true;
badComponentString = badComponentString + " Red";
}
if ( g < 0.0 || g > 1.0) {
rangeError = true;
badComponentString = badComponentString + " Green";
}
if ( b < 0.0 || b > 1.0) {
rangeError = true;
badComponentString = badComponentString + " Blue";
}
if ( rangeError == true ) {
throw new IllegalArgumentException("Color parameter outside of expected range:"
+ badComponentString);
}
}
/**
* Creates an opaque sRGB color with the specified red, green,
* and blue values in the range (0 - 255).
* The actual color used in rendering depends
* on finding the best match given the color space
* available for a given output device.
* Alpha is defaulted to 255.
*
* @throws IllegalArgumentException if <code>r</code>, <code>g</code>
* or <code>b</code> are outside of the range
* 0 to 255, inclusive
* @param r the red component
* @param g the green component
* @param b the blue component
* @see #getRed
* @see #getGreen
* @see #getBlue
* @see #getRGB
*/
public Color(int r, int g, int b) {
this(r, g, b, 255);
}
/**
* Creates an sRGB color with the specified red, green, blue, and alpha
* values in the range (0 - 255).
*
* @throws IllegalArgumentException if <code>r</code>, <code>g</code>,
* <code>b</code> or <code>a</code> are outside of the range
* 0 to 255, inclusive
* @param r the red component
* @param g the green component
* @param b the blue component
* @param a the alpha component
* @see #getRed
* @see #getGreen
* @see #getBlue
* @see #getAlpha
* @see #getRGB
*/
@ConstructorProperties({"red", "green", "blue", "alpha"})
public Color(int r, int g, int b, int a) {
value = ((a & 0xFF) << 24) |
((r & 0xFF) << 16) |
((g & 0xFF) << 8) |
((b & 0xFF) << 0);
testColorValueRange(r,g,b,a);
}
/**
* Creates an opaque sRGB color with the specified combined RGB value
* consisting of the red component in bits 16-23, the green component
* in bits 8-15, and the blue component in bits 0-7. The actual color
* used in rendering depends on finding the best match given the
* color space available for a particular output device. Alpha is
* defaulted to 255.
*
* @param rgb the combined RGB components
* @see java.awt.image.ColorModel#getRGBdefault
* @see #getRed
* @see #getGreen
* @see #getBlue
* @see #getRGB
*/
public Color(int rgb) {
value = 0xff000000 | rgb;
}
/**
* Creates an sRGB color with the specified combined RGBA value consisting
* of the alpha component in bits 24-31, the red component in bits 16-23,
* the green component in bits 8-15, and the blue component in bits 0-7.
* If the <code>hasalpha</code> argument is <code>false</code>, alpha
* is defaulted to 255.
*
* @param rgba the combined RGBA components
* @param hasalpha <code>true</code> if the alpha bits are valid;
* <code>false</code> otherwise
* @see java.awt.image.ColorModel#getRGBdefault
* @see #getRed
* @see #getGreen
* @see #getBlue
* @see #getAlpha
* @see #getRGB
*/
public Color(int rgba, boolean hasalpha) {
if (hasalpha) {
value = rgba;
} else {
value = 0xff000000 | rgba;
}
}
/**
* Creates an opaque sRGB color with the specified red, green, and blue
* values in the range (0.0 - 1.0). Alpha is defaulted to 1.0. The
* actual color used in rendering depends on finding the best
* match given the color space available for a particular output
* device.
*
* @throws IllegalArgumentException if <code>r</code>, <code>g</code>
* or <code>b</code> are outside of the range
* 0.0 to 1.0, inclusive
* @param r the red component
* @param g the green component
* @param b the blue component
* @see #getRed
* @see #getGreen
* @see #getBlue
* @see #getRGB
*/
public Color(float r, float g, float b) {
this( (int) (r*255+0.5), (int) (g*255+0.5), (int) (b*255+0.5));
testColorValueRange(r,g,b,1.0f);
frgbvalue = new float[3];
frgbvalue[0] = r;
frgbvalue[1] = g;
frgbvalue[2] = b;
falpha = 1.0f;
fvalue = frgbvalue;
}
/**
* Creates an sRGB color with the specified red, green, blue, and
* alpha values in the range (0.0 - 1.0). The actual color
* used in rendering depends on finding the best match given the
* color space available for a particular output device.
* @throws IllegalArgumentException if <code>r</code>, <code>g</code>
* <code>b</code> or <code>a</code> are outside of the range
* 0.0 to 1.0, inclusive
* @param r the red component
* @param g the green component
* @param b the blue component
* @param a the alpha component
* @see #getRed
* @see #getGreen
* @see #getBlue
* @see #getAlpha
* @see #getRGB
*/
public Color(float r, float g, float b, float a) {
this((int)(r*255+0.5), (int)(g*255+0.5), (int)(b*255+0.5), (int)(a*255+0.5));
frgbvalue = new float[3];
frgbvalue[0] = r;
frgbvalue[1] = g;
frgbvalue[2] = b;
falpha = a;
fvalue = frgbvalue;
}
/**
* Creates a color in the specified <code>ColorSpace</code>
* with the color components specified in the <code>float</code>
* array and the specified alpha. The number of components is
* determined by the type of the <code>ColorSpace</code>. For
* example, RGB requires 3 components, but CMYK requires 4
* components.
* @param cspace the <code>ColorSpace</code> to be used to
* interpret the components
* @param components an arbitrary number of color components
* that is compatible with the <code>ColorSpace</code>
* @param alpha alpha value
* @throws IllegalArgumentException if any of the values in the
* <code>components</code> array or <code>alpha</code> is
* outside of the range 0.0 to 1.0
* @see #getComponents
* @see #getColorComponents
*/
public Color(ColorSpace cspace, float components[], float alpha) {
boolean rangeError = false;
String badComponentString = "";
int n = cspace.getNumComponents();
fvalue = new float[n];
for (int i = 0; i < n; i++) {
if (components[i] < 0.0 || components[i] > 1.0) {
rangeError = true;
badComponentString = badComponentString + "Component " + i
+ " ";
} else {
fvalue[i] = components[i];
}
}
if (alpha < 0.0 || alpha > 1.0) {
rangeError = true;
badComponentString = badComponentString + "Alpha";
} else {
falpha = alpha;
}
if (rangeError) {
throw new IllegalArgumentException(
"Color parameter outside of expected range: " +
badComponentString);
}
frgbvalue = cspace.toRGB(fvalue);
cs = cspace;
value = ((((int)(falpha*255)) & 0xFF) << 24) |
((((int)(frgbvalue[0]*255)) & 0xFF) << 16) |
((((int)(frgbvalue[1]*255)) & 0xFF) << 8) |
((((int)(frgbvalue[2]*255)) & 0xFF) << 0);
}
/**
* Returns the red component in the range 0-255 in the default sRGB
* space.
* @return the red component.
* @see #getRGB
*/
public int getRed() {
return (getRGB() >> 16) & 0xFF;
}
/**
* Returns the green component in the range 0-255 in the default sRGB
* space.
* @return the green component.
* @see #getRGB
*/
public int getGreen() {
return (getRGB() >> 8) & 0xFF;
}
/**
* Returns the blue component in the range 0-255 in the default sRGB
* space.
* @return the blue component.
* @see #getRGB
*/
public int getBlue() {
return (getRGB() >> 0) & 0xFF;
}
/**
* Returns the alpha component in the range 0-255.
* @return the alpha component.
* @see #getRGB
*/
public int getAlpha() {
return (getRGB() >> 24) & 0xff;
}
/**
* Returns the RGB value representing the color in the default sRGB
* {@link ColorModel}.
* (Bits 24-31 are alpha, 16-23 are red, 8-15 are green, 0-7 are
* blue).
* @return the RGB value of the color in the default sRGB
* <code>ColorModel</code>.
* @see java.awt.image.ColorModel#getRGBdefault
* @see #getRed
* @see #getGreen
* @see #getBlue
* @since JDK1.0
*/
public int getRGB() {
return value;
}
private static final double FACTOR = 0.7;
/**
* Creates a new <code>Color</code> that is a brighter version of this
* <code>Color</code>.
* <p>
* This method applies an arbitrary scale factor to each of the three RGB
* components of this <code>Color</code> to create a brighter version
* of this <code>Color</code>.
* The {@code alpha} value is preserved.
* Although <code>brighter</code> and
* <code>darker</code> are inverse operations, the results of a
* series of invocations of these two methods might be inconsistent
* because of rounding errors.
* @return a new <code>Color</code> object that is
* a brighter version of this <code>Color</code>
* with the same {@code alpha} value.
* @see java.awt.Color#darker
* @since JDK1.0
*/
public Color brighter() {
int r = getRed();
int g = getGreen();
int b = getBlue();
int alpha = getAlpha();
/* From 2D group:
* 1. black.brighter() should return grey
* 2. applying brighter to blue will always return blue, brighter
* 3. non pure color (non zero rgb) will eventually return white
*/
int i = (int)(1.0/(1.0-FACTOR));
if ( r == 0 && g == 0 && b == 0) {
return new Color(i, i, i, alpha);
}
if ( r > 0 && r < i ) r = i;
if ( g > 0 && g < i ) g = i;
if ( b > 0 && b < i ) b = i;
return new Color(Math.min((int)(r/FACTOR), 255),
Math.min((int)(g/FACTOR), 255),
Math.min((int)(b/FACTOR), 255),
alpha);
}
/**
* Creates a new <code>Color</code> that is a darker version of this
* <code>Color</code>.
* <p>
* This method applies an arbitrary scale factor to each of the three RGB
* components of this <code>Color</code> to create a darker version of
* this <code>Color</code>.
* The {@code alpha} value is preserved.
* Although <code>brighter</code> and
* <code>darker</code> are inverse operations, the results of a series
* of invocations of these two methods might be inconsistent because
* of rounding errors.
* @return a new <code>Color</code> object that is
* a darker version of this <code>Color</code>
* with the same {@code alpha} value.
* @see java.awt.Color#brighter
* @since JDK1.0
*/
public Color darker() {
return new Color(Math.max((int)(getRed() *FACTOR), 0),
Math.max((int)(getGreen()*FACTOR), 0),
Math.max((int)(getBlue() *FACTOR), 0),
getAlpha());
}
/**
* Computes the hash code for this <code>Color</code>.
* @return a hash code value for this object.
* @since JDK1.0
*/
public int hashCode() {
return value;
}
/**
* Determines whether another object is equal to this
* <code>Color</code>.
* <p>
* The result is <code>true</code> if and only if the argument is not
* <code>null</code> and is a <code>Color</code> object that has the same
* red, green, blue, and alpha values as this object.
* @param obj the object to test for equality with this
* <code>Color</code>
* @return <code>true</code> if the objects are the same;
* <code>false</code> otherwise.
* @since JDK1.0
*/
public boolean equals(Object obj) {
return obj instanceof Color && ((Color)obj).getRGB() == this.getRGB();
}
/**
* Returns a string representation of this <code>Color</code>. This
* method is intended to be used only for debugging purposes. The
* content and format of the returned string might vary between
* implementations. The returned string might be empty but cannot
* be <code>null</code>.
*
* @return a string representation of this <code>Color</code>.
*/
public String toString() {
return getClass().getName() + "[r=" + getRed() + ",g=" + getGreen() + ",b=" + getBlue() + "]";
}
/**
* Converts a <code>String</code> to an integer and returns the
* specified opaque <code>Color</code>. This method handles string
* formats that are used to represent octal and hexadecimal numbers.
* @param nm a <code>String</code> that represents
* an opaque color as a 24-bit integer
* @return the new <code>Color</code> object.
* @see java.lang.Integer#decode
* @exception NumberFormatException if the specified string cannot
* be interpreted as a decimal,
* octal, or hexadecimal integer.
* @since JDK1.1
*/
public static Color decode(String nm) throws NumberFormatException {
Integer intval = Integer.decode(nm);
int i = intval.intValue();
return new Color((i >> 16) & 0xFF, (i >> 8) & 0xFF, i & 0xFF);
}
/**
* Finds a color in the system properties.
* <p>
* The argument is treated as the name of a system property to
* be obtained. The string value of this property is then interpreted
* as an integer which is then converted to a <code>Color</code>
* object.
* <p>
* If the specified property is not found or could not be parsed as
* an integer then <code>null</code> is returned.
* @param nm the name of the color property
* @return the <code>Color</code> converted from the system
* property.
* @see java.lang.System#getProperty(java.lang.String)
* @see java.lang.Integer#getInteger(java.lang.String)
* @see java.awt.Color#Color(int)
* @since JDK1.0
*/
public static Color getColor(String nm) {
return getColor(nm, null);
}
/**
* Finds a color in the system properties.
* <p>
* The first argument is treated as the name of a system property to
* be obtained. The string value of this property is then interpreted
* as an integer which is then converted to a <code>Color</code>
* object.
* <p>
* If the specified property is not found or cannot be parsed as
* an integer then the <code>Color</code> specified by the second
* argument is returned instead.
* @param nm the name of the color property
* @param v the default <code>Color</code>
* @return the <code>Color</code> converted from the system
* property, or the specified <code>Color</code>.
* @see java.lang.System#getProperty(java.lang.String)
* @see java.lang.Integer#getInteger(java.lang.String)
* @see java.awt.Color#Color(int)
* @since JDK1.0
*/
public static Color getColor(String nm, Color v) {
Integer intval = Integer.getInteger(nm);
if (intval == null) {
return v;
}
int i = intval.intValue();
return new Color((i >> 16) & 0xFF, (i >> 8) & 0xFF, i & 0xFF);
}
/**
* Finds a color in the system properties.
* <p>
* The first argument is treated as the name of a system property to
* be obtained. The string value of this property is then interpreted
* as an integer which is then converted to a <code>Color</code>
* object.
* <p>
* If the specified property is not found or could not be parsed as
* an integer then the integer value <code>v</code> is used instead,
* and is converted to a <code>Color</code> object.
* @param nm the name of the color property
* @param v the default color value, as an integer
* @return the <code>Color</code> converted from the system
* property or the <code>Color</code> converted from
* the specified integer.
* @see java.lang.System#getProperty(java.lang.String)
* @see java.lang.Integer#getInteger(java.lang.String)
* @see java.awt.Color#Color(int)
* @since JDK1.0
*/
public static Color getColor(String nm, int v) {
Integer intval = Integer.getInteger(nm);
int i = (intval != null) ? intval.intValue() : v;
return new Color((i >> 16) & 0xFF, (i >> 8) & 0xFF, (i >> 0) & 0xFF);
}
/**
* Converts the components of a color, as specified by the HSB
* model, to an equivalent set of values for the default RGB model.
* <p>
* The <code>saturation</code> and <code>brightness</code> components
* should be floating-point values between zero and one
* (numbers in the range 0.0-1.0). The <code>hue</code> component
* can be any floating-point number. The floor of this number is
* subtracted from it to create a fraction between 0 and 1. This
* fractional number is then multiplied by 360 to produce the hue
* angle in the HSB color model.
* <p>
* The integer that is returned by <code>HSBtoRGB</code> encodes the
* value of a color in bits 0-23 of an integer value that is the same
* format used by the method {@link #getRGB() getRGB}.
* This integer can be supplied as an argument to the
* <code>Color</code> constructor that takes a single integer argument.
* @param hue the hue component of the color
* @param saturation the saturation of the color
* @param brightness the brightness of the color
* @return the RGB value of the color with the indicated hue,
* saturation, and brightness.
* @see java.awt.Color#getRGB()
* @see java.awt.Color#Color(int)
* @see java.awt.image.ColorModel#getRGBdefault()
* @since JDK1.0
*/
public static int HSBtoRGB(float hue, float saturation, float brightness) {
int r = 0, g = 0, b = 0;
if (saturation == 0) {
r = g = b = (int) (brightness * 255.0f + 0.5f);
} else {
float h = (hue - (float)Math.floor(hue)) * 6.0f;
float f = h - (float)java.lang.Math.floor(h);
float p = brightness * (1.0f - saturation);
float q = brightness * (1.0f - saturation * f);
float t = brightness * (1.0f - (saturation * (1.0f - f)));
switch ((int) h) {
case 0:
r = (int) (brightness * 255.0f + 0.5f);
g = (int) (t * 255.0f + 0.5f);
b = (int) (p * 255.0f + 0.5f);
break;
case 1:
r = (int) (q * 255.0f + 0.5f);
g = (int) (brightness * 255.0f + 0.5f);
b = (int) (p * 255.0f + 0.5f);
break;
case 2:
r = (int) (p * 255.0f + 0.5f);
g = (int) (brightness * 255.0f + 0.5f);
b = (int) (t * 255.0f + 0.5f);
break;
case 3:
r = (int) (p * 255.0f + 0.5f);
g = (int) (q * 255.0f + 0.5f);
b = (int) (brightness * 255.0f + 0.5f);
break;
case 4:
r = (int) (t * 255.0f + 0.5f);
g = (int) (p * 255.0f + 0.5f);
b = (int) (brightness * 255.0f + 0.5f);
break;
case 5:
r = (int) (brightness * 255.0f + 0.5f);
g = (int) (p * 255.0f + 0.5f);
b = (int) (q * 255.0f + 0.5f);
break;
}
}
return 0xff000000 | (r << 16) | (g << 8) | (b << 0);
}
/**
* Converts the components of a color, as specified by the default RGB
* model, to an equivalent set of values for hue, saturation, and
* brightness that are the three components of the HSB model.
* <p>
* If the <code>hsbvals</code> argument is <code>null</code>, then a
* new array is allocated to return the result. Otherwise, the method
* returns the array <code>hsbvals</code>, with the values put into
* that array.
* @param r the red component of the color
* @param g the green component of the color
* @param b the blue component of the color
* @param hsbvals the array used to return the
* three HSB values, or <code>null</code>
* @return an array of three elements containing the hue, saturation,
* and brightness (in that order), of the color with
* the indicated red, green, and blue components.
* @see java.awt.Color#getRGB()
* @see java.awt.Color#Color(int)
* @see java.awt.image.ColorModel#getRGBdefault()
* @since JDK1.0
*/
public static float[] RGBtoHSB(int r, int g, int b, float[] hsbvals) {
float hue, saturation, brightness;
if (hsbvals == null) {
hsbvals = new float[3];
}
int cmax = (r > g) ? r : g;
if (b > cmax) cmax = b;
int cmin = (r < g) ? r : g;
if (b < cmin) cmin = b;
brightness = ((float) cmax) / 255.0f;
if (cmax != 0)
saturation = ((float) (cmax - cmin)) / ((float) cmax);
else
saturation = 0;
if (saturation == 0)
hue = 0;
else {
float redc = ((float) (cmax - r)) / ((float) (cmax - cmin));
float greenc = ((float) (cmax - g)) / ((float) (cmax - cmin));
float bluec = ((float) (cmax - b)) / ((float) (cmax - cmin));
if (r == cmax)
hue = bluec - greenc;
else if (g == cmax)
hue = 2.0f + redc - bluec;
else
hue = 4.0f + greenc - redc;
hue = hue / 6.0f;
if (hue < 0)
hue = hue + 1.0f;
}
hsbvals[0] = hue;
hsbvals[1] = saturation;
hsbvals[2] = brightness;
return hsbvals;
}
/**
* Creates a <code>Color</code> object based on the specified values
* for the HSB color model.
* <p>
* The <code>s</code> and <code>b</code> components should be
* floating-point values between zero and one
* (numbers in the range 0.0-1.0). The <code>h</code> component
* can be any floating-point number. The floor of this number is
* subtracted from it to create a fraction between 0 and 1. This
* fractional number is then multiplied by 360 to produce the hue
* angle in the HSB color model.
* @param h the hue component
* @param s the saturation of the color
* @param b the brightness of the color
* @return a <code>Color</code> object with the specified hue,
* saturation, and brightness.
* @since JDK1.0
*/
public static Color getHSBColor(float h, float s, float b) {
return new Color(HSBtoRGB(h, s, b));
}
/**
* Returns a <code>float</code> array containing the color and alpha
* components of the <code>Color</code>, as represented in the default
* sRGB color space.
* If <code>compArray</code> is <code>null</code>, an array of length
* 4 is created for the return value. Otherwise,
* <code>compArray</code> must have length 4 or greater,
* and it is filled in with the components and returned.
* @param compArray an array that this method fills with
* color and alpha components and returns
* @return the RGBA components in a <code>float</code> array.
*/
public float[] getRGBComponents(float[] compArray) {
float[] f;
if (compArray == null) {
f = new float[4];
} else {
f = compArray;
}
if (frgbvalue == null) {
f[0] = ((float)getRed())/255f;
f[1] = ((float)getGreen())/255f;
f[2] = ((float)getBlue())/255f;
f[3] = ((float)getAlpha())/255f;
} else {
f[0] = frgbvalue[0];
f[1] = frgbvalue[1];
f[2] = frgbvalue[2];
f[3] = falpha;
}
return f;
}
/**
* Returns a <code>float</code> array containing only the color