/*!
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Lesser General Public License for more details.
*
* Copyright (c) 2002-2013 Pentaho Corporation.. All rights reserved.
*/
package org.pentaho.reporting.libraries.css.util;
import org.pentaho.reporting.libraries.css.keys.color.CSSSystemColors;
import org.pentaho.reporting.libraries.css.keys.color.HtmlColors;
import org.pentaho.reporting.libraries.css.keys.color.SVGColors;
import org.pentaho.reporting.libraries.css.values.CSSColorValue;
import org.pentaho.reporting.libraries.css.values.CSSValue;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.HashMap;
/**
* Creation-Date: 16.04.2006, 15:23:58
*
* @author Thomas Morgner
*/
public final class ColorUtil {
private static final HashMap knownColorNamesByColor;
private static final HashMap knownColorsByName;
static {
knownColorNamesByColor = new HashMap();
knownColorsByName = new HashMap();
fillColorsFromClass( SVGColors.class );
fillColorsFromClass( HtmlColors.class );
fillColorsFromClass( CSSSystemColors.class );
}
private static void fillColorsFromClass( final Class c ) {
try {
final Field[] fields = c.getFields();
for ( int i = 0; i < fields.length; i++ ) {
final Field f = fields[ i ];
if ( Modifier.isPublic( f.getModifiers() )
&& Modifier.isFinal( f.getModifiers() )
&& Modifier.isStatic( f.getModifiers() ) ) {
final String name = f.getName();
final Object oColor = f.get( null );
if ( oColor instanceof CSSColorValue ) {
knownColorNamesByColor.put( oColor, name.toLowerCase() );
knownColorsByName.put( name.toLowerCase(), oColor );
}
}
}
} catch ( Exception e ) {
// ignore ..
}
}
private ColorUtil() {
}
private static final float ONE_THIRD = 1f / 3f;
/*
* HOW TO RETURN hsl.to.rgb(h, s, l):
SELECT:
l<=0.5: PUT l*(s+1) IN m2
ELSE: PUT l+s-l*s IN m2
PUT l*2-m2 IN m1
PUT hue.to.rgb(m1, m2, h+1/3) IN r
PUT hue.to.rgb(m1, m2, h ) IN g
PUT hue.to.rgb(m1, m2, h-1/3) IN b
RETURN (r, g, b)
HOW TO RETURN hue.to.rgb(m1, m2, h):
IF h<0: PUT h+1 IN h
IF h>1: PUT h-1 IN h
IF h*6<1: RETURN m1+(m2-m1)*h*6
IF h*2<1: RETURN m2
IF h*3<2: RETURN m1+(m2-m1)*(2/3-h)*6
RETURN m1
*/
public static float[] hslToRGB( int h, float s, float l ) {
final int hue = normalizeHue( h );
float saturation = s;
if ( saturation > 100 ) {
saturation = 100;
}
if ( saturation < 0 ) {
saturation = 0;
}
float lightness = l;
if ( lightness > 100 ) {
lightness = 100;
}
if ( lightness < 0 ) {
lightness = 0;
}
float m2;
if ( lightness <= 0.5 ) {
m2 = lightness * ( saturation + 1 );
} else {
m2 = lightness + saturation - lightness * saturation;
}
float m1 = lightness * 2 - m2;
float r = hueToRGB( m1, m2, hue + ONE_THIRD );
float g = hueToRGB( m1, m2, hue );
float b = hueToRGB( m1, m2, hue - ONE_THIRD );
return new float[] { r, g, b };
}
private static float hueToRGB( float m1, float m2, float h ) {
if ( h < 0 ) {
h = h + 1;
}
if ( h > 1 ) {
h = h - 1;
}
if ( ( h * 6f ) < 1 ) {
return m1 + ( m2 - m1 ) * h * 6;
}
if ( ( h * 2f ) < 1 ) {
return m2;
}
if ( ( h * 3f ) < 2 ) {
return m1 + ( m2 - m1 ) * ( 2 * ONE_THIRD - h ) * 6;
}
return m1;
}
private static int normalizeHue( final int integerValue ) {
return ( ( integerValue % 360 ) + 360 ) % 360;
}
public static CSSValue parseColor( String colorSpec ) {
final CSSValue color = parseIdentColor( colorSpec );
if ( color != null ) {
return color;
}
try {
if ( colorSpec.length() == 4 ) // #rgb
{
final int redColorValue = charToNumber( colorSpec.charAt( 1 ) );
final int greenColorValue = charToNumber( colorSpec.charAt( 2 ) );
final int blueColorValue = charToNumber( colorSpec.charAt( 3 ) );
final int colorValue =
redColorValue << 20 | redColorValue << 16 |
greenColorValue << 12 | greenColorValue << 8 |
blueColorValue << 4 | blueColorValue;
return new CSSColorValue( colorValue, false );
}
final Integer decoded = Integer.decode( colorSpec );
return new CSSColorValue( decoded.intValue(), false );
} catch ( Exception e ) {
return null;
}
}
private static int charToNumber( char character ) {
switch( character ) {
case '0':
return 0;
case '1':
return 1;
case '2':
return 2;
case '3':
return 3;
case '4':
return 4;
case '5':
return 5;
case '6':
return 6;
case '7':
return 7;
case '8':
return 8;
case '9':
return 9;
case 'A':
return 10;
case 'a':
return 10;
case 'B':
return 11;
case 'b':
return 11;
case 'C':
return 12;
case 'c':
return 12;
case 'D':
return 13;
case 'd':
return 13;
case 'E':
return 14;
case 'e':
return 14;
case 'F':
return 15;
case 'f':
return 15;
default:
throw new NullPointerException();
}
}
public static CSSValue parseIdentColor( String name ) {
if ( CSSSystemColors.CURRENT_COLOR.getCSSText().equalsIgnoreCase( name ) ) {
return CSSSystemColors.CURRENT_COLOR;
}
return (CSSValue) knownColorsByName.get( name.toLowerCase() );
}
}