X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Futil%2FColorUtils.java;h=4ba17d53b80c1493db98f27aac3d77870f2c0ab8;hb=65d6d09cd08743d481d39521bb0298ea683888f8;hp=f108da1fed49c1470ceb613ad202f8ff092b93bb;hpb=47168f025aefdaa044802bd5f8f510ffe43a4808;p=jalview.git

diff --git a/src/jalview/util/ColorUtils.java b/src/jalview/util/ColorUtils.java
index f108da1..4ba17d5 100644
--- a/src/jalview/util/ColorUtils.java
+++ b/src/jalview/util/ColorUtils.java
@@ -1,6 +1,6 @@
 /*
- * Jalview - A Sequence Alignment Editor and Viewer (Version 2.8.2)
- * Copyright (C) 2014 The Jalview Authors
+ * Jalview - A Sequence Alignment Editor and Viewer ($$Version-Rel$$)
+ * Copyright (C) $$Year-Rel$$ The Jalview Authors
  * 
  * This file is part of Jalview.
  * 
@@ -24,12 +24,18 @@
 
 package jalview.util;
 
+import jalview.api.ColorI;
+
 import java.awt.Color;
 import java.util.Random;
 
 public class ColorUtils
 {
 
+  public static Color getColor(ColorI c)
+  {
+    return new Color(c.getRed(), c.getGreen(), c.getBlue());
+  }
   /**
    * Generates a random color, will mix with input color. Code taken from
    * http://stackoverflow
@@ -59,4 +65,87 @@ public class ColorUtils
 
   }
 
+  /**
+   * Convert to Tk colour code format
+   * 
+   * @param colour
+   * @return
+   * @see http
+   *      ://www.cgl.ucsf.edu/chimera/current/docs/UsersGuide/colortool.html#
+   *      tkcode
+   */
+  public static final String toTkCode(ColorI colour)
+  {
+    String colstring = "#" + ((colour.getRed() < 16) ? "0" : "")
+            + Integer.toHexString(colour.getRed())
+            + ((colour.getGreen() < 16) ? "0" : "")
+            + Integer.toHexString(colour.getGreen())
+            + ((colour.getBlue() < 16) ? "0" : "")
+            + Integer.toHexString(colour.getBlue());
+    return colstring;
+  }
+
+  /**
+   * Returns a colour three shades darker. Note you can't guarantee that
+   * brighterThan reverses this, as darkerThan may result in black.
+   * 
+   * @param col
+   * @return
+   */
+  public static Color darkerThan(Color col)
+  {
+    return col == null ? null : col.darker().darker().darker();
+  }
+
+  /**
+   * Returns a colour three shades brighter. Note you can't guarantee that
+   * darkerThan reverses this, as brighterThan may result in white.
+   * 
+   * @param col
+   * @return
+   */
+  public static Color brighterThan(Color col)
+  {
+    return col == null ? null : col.brighter().brighter().brighter();
+  }
+
+  /**
+   * Returns a color between minColour and maxColour; the RGB values are in
+   * proportion to where 'value' lies between minValue and maxValue
+   * 
+   * @param value
+   * @param minValue
+   * @param minColour
+   * @param maxValue
+   * @param maxColour
+   * @return
+   */
+  public static Color getGraduatedColour(float value, float minValue,
+          Color minColour, float maxValue, Color maxColour)
+  {
+    if (minValue == maxValue)
+    {
+      return minColour;
+    }
+    if (value < minValue)
+    {
+      value = minValue;
+    }
+    if (value > maxValue)
+    {
+      value = maxValue;
+    }
+
+    /*
+     * prop = proportion of the way value is from minValue to maxValue
+     */
+    float prop = (value - minValue) / (maxValue - minValue);
+    float r = minColour.getRed() + prop
+            * (maxColour.getRed() - minColour.getRed());
+    float g = minColour.getGreen() + prop
+            * (maxColour.getGreen() - minColour.getGreen());
+    float b = minColour.getBlue() + prop
+            * (maxColour.getBlue() - minColour.getBlue());
+    return new Color(r / 255, g / 255, b / 255);
+  }
 }