package jalview.util;
import java.awt.Color;
+import java.util.HashMap;
+import java.util.Map;
import java.util.Random;
public class ColorUtils
{
+ private static final int MAX_CACHE_SIZE = 1729;
+ /*
+ * a cache for colours generated from text strings
+ */
+ static Map<String, Color> myColours = new HashMap<>();
/**
* Generates a random color, will mix with input color. Code taken from
* 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());
+ 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);
}
return null;
}
colour = colour.trim();
-
+
Color col = null;
try
{
} catch (NumberFormatException ex)
{
}
-
+
if (col == null)
{
col = ColorUtils.getAWTColorFromName(colour);
}
-
+
if (col == null)
{
try
// non-numeric token or out of 0-255 range
}
}
-
+
return col;
}
*/
public static Color createColourFromName(String name)
{
+ if (name == null)
+ {
+ return Color.white;
+ }
+ if (myColours.containsKey(name))
+ {
+ return myColours.get(name);
+ }
int lsize = name.length();
int start = 0;
int end = lsize / 3;
-
- int rgbOffset = Math.abs(name.hashCode() % 10) * 15;
-
+
+ int rgbOffset = Math.abs(name.hashCode() % 10) * 15; // 0-135
+
/*
* red: first third
*/
- int r = Math.abs(name.substring(start, end).hashCode() + rgbOffset) % 210 + 20;
+ int r = Math.abs(name.substring(start, end).hashCode() + rgbOffset)
+ % 210 + 20;
start = end;
end += lsize / 3;
if (end > lsize)
{
end = lsize;
}
-
+
/*
* green: second third
*/
- int g = Math.abs(name.substring(start, end).hashCode() + rgbOffset) % 210 + 20;
-
+ int g = Math.abs(name.substring(start, end).hashCode() + rgbOffset)
+ % 210 + 20;
+
/*
* blue: third third
*/
int b = Math.abs(name.substring(end).hashCode() + rgbOffset) % 210 + 20;
-
+
Color color = new Color(r, g, b);
-
+
+ if (myColours.size() < MAX_CACHE_SIZE)
+ {
+ myColours.put(name, color);
+ }
+
return color;
}
}
Color col = null;
name = name.toLowerCase();
-
+
// or make a static map; or use reflection on the field name
switch (name)
{
col = Color.yellow;
break;
}
-
+
return col;
}
}