svn commit: r1536734 - in /pivot/trunk/wtk/src/org/apache/pivot/wtk/util: ./ ColorUtilities.java

[sm...@apache.org]

Author: smartini
Date: Tue Oct 29 14:32:01 2013
New Revision: 1536734

URL: http://svn.apache.org/r1536734
Log:
add utility class for generic Color calculations, then remove from TerraTheme (in the next commit)

Added:
    pivot/trunk/wtk/src/org/apache/pivot/wtk/util/
    pivot/trunk/wtk/src/org/apache/pivot/wtk/util/ColorUtilities.java

Added: pivot/trunk/wtk/src/org/apache/pivot/wtk/util/ColorUtilities.java
URL: http://svn.apache.org/viewvc/pivot/trunk/wtk/src/org/apache/pivot/wtk/util/ColorUtilities.java?rev=1536734&view=auto
==============================================================================
--- pivot/trunk/wtk/src/org/apache/pivot/wtk/util/ColorUtilities.java (added)
+++ pivot/trunk/wtk/src/org/apache/pivot/wtk/util/ColorUtilities.java Tue Oct 29 14:32:01 2013
@@ -0,0 +1,57 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to you under the Apache License,
+ * Version 2.0 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.pivot.wtk.util;
+
+import java.awt.Color;
+
+/**
+ * Utility methods for/on Colors.
+ */
+public final class ColorUtilities {
+
+    /**
+     * Private constructor
+     */
+    private ColorUtilities() {
+    }
+
+    /**
+     * Returns a brighter version of the specified color. Specifically, it
+     * increases the brightness (in the HSB color model) by the given
+     * <tt>adjustment</tt> factor (usually in the range ]0 .. 1[).
+     */
+    public static Color brighten(final Color color, final float adjustment) {
+        return adjustBrightness(color, adjustment);
+    }
+
+    /**
+     * Returns a darker version of the specified color. Specifically, it
+     * decreases the brightness (in the HSB color model) by the given
+     * <tt>adjustment</tt> factor (usually in the range ]0 .. 1[).
+     */
+    public static Color darken(final Color color, final float adjustment) {
+        return adjustBrightness(color, (adjustment * -1.0f));
+    }
+
+    public static Color adjustBrightness(final Color color, final float adjustment) {
+        float[] hsb = Color.RGBtoHSB(color.getRed(), color.getGreen(), color.getBlue(), null);
+        hsb[2] = Math.min(Math.max(hsb[2] + adjustment, 0f), 1f);
+        int rgb = Color.HSBtoRGB(hsb[0], hsb[1], hsb[2]);
+        return new Color((color.getAlpha() << 24) | (rgb & 0xffffff), true);
+    }
+
+}