--- /dev/null
+/*******************************************************************************
+ * Copyright (c) 2000, 2013 IBM Corporation and others.
+ *
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ * IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.swt.graphics;
+
+import java.io.*;
+
+import org.eclipse.swt.*;
+
+/**
+ * Instances of this class are descriptions of colors in
+ * terms of the primary additive color model (red, green and
+ * blue). A color may be described in terms of the relative
+ * intensities of these three primary colors. The brightness
+ * of each color is specified by a value in the range 0 to 255,
+ * where 0 indicates no color (blackness) and 255 indicates
+ * maximum intensity.
+ * <p>
+ * The hashCode() method in this class uses the values of the public
+ * fields to compute the hash value. When storing instances of the
+ * class in hashed collections, do not modify these fields after the
+ * object has been inserted.
+ * </p>
+ * <p>
+ * Application code does <em>not</em> need to explicitly release the
+ * resources managed by each instance when those instances are no longer
+ * required, and thus no <code>dispose()</code> method is provided.
+ * </p>
+ *
+ * @see Color
+ * @see <a href="http://www.eclipse.org/swt/snippets/#color">Color and RGB snippets</a>
+ * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
+ */
+
+public final class RGB implements Serializable {
+
+ /**
+ * the red component of the RGB
+ */
+ public int red;
+
+ /**
+ * the green component of the RGB
+ */
+ public int green;
+
+ /**
+ * the blue component of the RGB
+ */
+ public int blue;
+
+ static final long serialVersionUID = 3258415023461249074L;
+
+/**
+ * Constructs an instance of this class with the given
+ * red, green and blue values.
+ *
+ * @param red the red component of the new instance
+ * @param green the green component of the new instance
+ * @param blue the blue component of the new instance
+ *
+ * @exception IllegalArgumentException <ul>
+ * <li>ERROR_INVALID_ARGUMENT - if the red, green or blue argument is not between 0 and 255</li>
+ * </ul>
+ */
+public RGB(int red, int green, int blue) {
+ if ((red > 255) || (red < 0) ||
+ (green > 255) || (green < 0) ||
+ (blue > 255) || (blue < 0))
+ SWT.error(SWT.ERROR_INVALID_ARGUMENT);
+ this.red = red;
+ this.green = green;
+ this.blue = blue;
+}
+
+/**
+* Constructs an instance of this class with the given
+* hue, saturation, and brightness.
+*
+* @param hue the hue value for the HSB color (from 0 to 360)
+* @param saturation the saturation value for the HSB color (from 0 to 1)
+* @param brightness the brightness value for the HSB color (from 0 to 1)
+*
+* @exception IllegalArgumentException <ul>
+* <li>ERROR_INVALID_ARGUMENT - if the hue is not between 0 and 360 or
+* the saturation or brightness is not between 0 and 1</li>
+* </ul>
+*
+* @since 3.2
+*/
+public RGB(float hue, float saturation, float brightness) {
+ if (hue < 0 || hue > 360 || saturation < 0 || saturation > 1 ||
+ brightness < 0 || brightness > 1) {
+ SWT.error(SWT.ERROR_INVALID_ARGUMENT);
+ }
+ float r, g, b;
+ if (saturation == 0) {
+ r = g = b = brightness;
+ } else {
+ if (hue == 360) hue = 0;
+ hue /= 60;
+ int i = (int)hue;
+ float f = hue - i;
+ float p = brightness * (1 - saturation);
+ float q = brightness * (1 - saturation * f);
+ float t = brightness * (1 - saturation * (1 - f));
+ switch(i) {
+ case 0:
+ r = brightness;
+ g = t;
+ b = p;
+ break;
+ case 1:
+ r = q;
+ g = brightness;
+ b = p;
+ break;
+ case 2:
+ r = p;
+ g = brightness;
+ b = t;
+ break;
+ case 3:
+ r = p;
+ g = q;
+ b = brightness;
+ break;
+ case 4:
+ r = t;
+ g = p;
+ b = brightness;
+ break;
+ case 5:
+ default:
+ r = brightness;
+ g = p;
+ b = q;
+ break;
+ }
+ }
+ red = (int)(r * 255 + 0.5);
+ green = (int)(g * 255 + 0.5);
+ blue = (int)(b * 255 + 0.5);
+}
+
+/**
+ * Returns the hue, saturation, and brightness of the color.
+ *
+ * @return color space values in float format:<ul>
+ * <li>hue (from 0 to 360)</li>
+ * <li>saturation (from 0 to 1)</li>
+ * <li>brightness (from 0 to 1)</li>
+ * </ul>
+ * @see #RGB(float, float, float)
+ *
+ * @since 3.2
+ */
+public float[] getHSB() {
+ float r = red / 255f;
+ float g = green / 255f;
+ float b = blue / 255f;
+ float max = Math.max(Math.max(r, g), b);
+ float min = Math.min(Math.min(r, g), b);
+ float delta = max - min;
+ float hue = 0;
+ float brightness = max;
+ float saturation = max == 0 ? 0 : (max - min) / max;
+ if (delta != 0) {
+ if (r == max) {
+ hue = (g - b) / delta;
+ } else {
+ if (g == max) {
+ hue = 2 + (b - r) / delta;
+ } else {
+ hue = 4 + (r - g) / delta;
+ }
+ }
+ hue *= 60;
+ if (hue < 0) hue += 360;
+ }
+ return new float[] {hue, saturation, brightness};
+}
+
+/**
+ * Compares the argument to the receiver, and returns true
+ * if they represent the <em>same</em> object using a class
+ * specific comparison.
+ *
+ * @param object the object to compare with this object
+ * @return <code>true</code> if the object is the same as this object and <code>false</code> otherwise
+ *
+ * @see #hashCode()
+ */
+@Override
+public boolean equals(Object object) {
+ if (object == this) return true;
+ if (!(object instanceof RGB)) return false;
+ RGB rgb = (RGB)object;
+ return (rgb.red == this.red) && (rgb.green == this.green) && (rgb.blue == this.blue);
+}
+
+/**
+ * Returns an integer hash code for the receiver. Any two
+ * objects that return <code>true</code> when passed to
+ * <code>equals</code> must return the same value for this
+ * method.
+ *
+ * @return the receiver's hash
+ *
+ * @see #equals(Object)
+ */
+@Override
+public int hashCode() {
+ return (blue << 16) | (green << 8) | red;
+}
+
+/**
+ * Returns a string containing a concise, human-readable
+ * description of the receiver.
+ *
+ * @return a string representation of the <code>RGB</code>
+ */
+@Override
+public String toString() {
+ return "RGB {" + red + ", " + green + ", " + blue + "}"; //$NON-NLS-1$//$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
+}
+
+}
Code Review / simantics / platform.git / blobdiff