/*******************************************************************************

 * Copyright (c) 2007 IBM Corporation and others.

 * All rights reserved. This program and the accompanying materials

 * are made available under the terms of the Eclipse Public License v1.0

 * which accompanies this distribution, and is available at

 * http://www.eclipse.org/legal/epl-v10.html

 *

 * Contributors:

 *     IBM Corporation - initial API and implementation

 ******************************************************************************/

package org.eclipse.ui.internal.themes;

import org.eclipse.swt.graphics.RGB;

/**

 * @since 3.3

 *

 */

public class KelvinColorsTabBegin extends KelvinColorsTabEnd {

	/*

	 * (non-Javadoc)

	 * 

	 * @see org.eclipse.ui.themes.IColorFactory#createColor()

	 */

	public RGB createColor() {

		if (baseColorName == null) 

			return new RGB(0, 0, 0);

		RGB base = super.createColor();

		return blend(75, white, base);

	}

}

/*******************************************************************************

 * Copyright (c) 2007 IBM Corporation and others.

 * All rights reserved. This program and the accompanying materials

 * are made available under the terms of the Eclipse Public License v1.0

 * which accompanies this distribution, and is available at

 * http://www.eclipse.org/legal/epl-v10.html

 *

 * Contributors:

 *     IBM Corporation - initial API and implementation

 ******************************************************************************/

package org.eclipse.ui.internal.themes;

import org.eclipse.swt.graphics.RGB;

import org.eclipse.ui.themes.ColorUtil;

/**

 * @since 3.3

 *

 */

public class KelvinColorsTabEnd extends KelvinColorFactory {

	/*

	 * Return the RGB value for the bottom tab color

	 * based on a blend of white and sample color

	 */

	private RGB getLightenedColor(RGB sample) {

		//Group 1

		if(valuesInRange(sample, 181, 255) >= 2)

			return sample;

		//Group 2

		if(valuesInRange(sample, 100, 180) >= 2)

			return blend(30, white, sample);

		//Group 3

		if(valuesInRange(sample, 0, 99) >= 2)

			return blend(60, white, sample);

		//Group 4

		return blend(30, white, sample);

	}

	/*

	 * (non-Javadoc)

	 * 

	 * @see org.eclipse.ui.themes.IColorFactory#createColor()

	 */

	public RGB createColor() {

		if (baseColorName == null) 

			return new RGB(0, 0, 0);

		return getLightenedColor(

				ColorUtil.getColorValue(baseColorName));

	}

}

/*******************************************************************************

 * Copyright (c) 2007 IBM Corporation and others.

 * All rights reserved. This program and the accompanying materials

 * are made available under the terms of the Eclipse Public License v1.0

 * which accompanies this distribution, and is available at

 * http://www.eclipse.org/legal/epl-v10.html

 *

 * Contributors:

 *     IBM Corporation - initial API and implementation

 ******************************************************************************/

package org.eclipse.ui.internal.themes;

import java.util.Hashtable;

import org.eclipse.core.runtime.IConfigurationElement;

import org.eclipse.core.runtime.IExecutableExtension;

import org.eclipse.swt.graphics.RGB;

import org.eclipse.ui.themes.IColorFactory;

/**

 * ColorSelectionFactory is the abstract superclass of factories that compare

 * two colors.

 * 

 * @since 3.3

 * 

 */

public abstract class KelvinColorFactory implements IColorFactory,

		IExecutableExtension {

	protected static final RGB white = new RGB(255, 255, 255);

	String baseColorName;

	/**

	 * This executable extension requires parameters to be explicitly declared

	 * via the second method described in the <code>IExecutableExtension</code>

	 * documentation. This class expects that there will be one parameter,

	 * <code>base</code>, that describes the base color to produce all other colours from.

	 * This value may either be an RGB triple or an SWT constant.

	 * 

	 * @see org.eclipse.core.runtime.IExecutableExtension#setInitializationData(org.eclipse.core.runtime.IConfigurationElement,

	 *      java.lang.String, java.lang.Object)

	 */

	public void setInitializationData(IConfigurationElement config,

			String propertyName, Object data) {

		if (data instanceof Hashtable) {

			Hashtable table = (Hashtable) data;

			baseColorName = (String) table.get("base"); //$NON-NLS-1$

		}

	}

	/* 

	 * Return the number of RGB values in test that are

	 * equal to or between lower and upper.

	 */

	protected int valuesInRange(RGB test, int lower, int upper) {

		int hits = 0;

		if(test.red >= lower && test.red <= upper) hits++;

		if(test.blue >= lower && test.blue <= upper) hits++;

		if(test.green >= lower && test.green <= upper) hits++;

		return hits;

	}

	/*

	 * Return an RGB value that is a blend of prop/100 of color1 and

	 * 100-prop of color2.

	 */	

	protected RGB blend(int prop1, RGB color1, RGB color2) {

		int prop2 = 100 - prop1;

		return new RGB(

				(color1.red * prop1 / 100) + (color2.red * prop2 / 100),

				(color1.green * prop1 / 100) + (color2.green * prop2 / 100),

				(color1.blue * prop1 / 100) + (color2.blue * prop2 / 100)

			);

	}

}