/*******************************************************************************
 * <copyright>
 *
 * Copyright (c) 2013, 2013 SAP AG.
 * 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:
 *    SAP AG - initial API, implementation and documentation
 *
 * </copyright>
 *
 *******************************************************************************/
package org.eclipse.fmc.blockdiagram.editor.algorithm.node;

import org.eclipse.graphiti.mm.algorithms.GraphicsAlgorithm;
import org.eclipse.graphiti.mm.algorithms.MultiText;

/**
 * This abstract class is the super class for all rectangle algorithms and
 * provides common methods for them. For example, there is a general rotate
 * method.
 * 
 * @author Benjamin Schmeling 
 * @author Heiko Witteborg 
 * 
 */
public abstract class AbstractRectangleAlgorithm extends AbstractNode implements
		RectangleAlgorithm{

	// ----------------------------------------
	// ----------- Named Node -----------------

	@Override
	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.fmc.blockdiagram.editor.node.NamedNode#relocateText(org.eclipse.graphiti
	 * .mm.algorithms.GraphicsAlgorithm)
	 */
	public void relocateText(GraphicsAlgorithm graphicsAlgorithm) {
		MultiText text = this.getText(graphicsAlgorithm);
		if (text != null) {
			int multipleOffset = 0;
			if (this.isMultipleInstances(this
					.getContainerShape(graphicsAlgorithm))) {
				multipleOffset = MULTI_INSTANCE_GAP;
			}
			int x = super.textMargin;
			int width = graphicsAlgorithm.getWidth() - 2 * super.textMargin
					- multipleOffset;
			int y = super.textMargin + multipleOffset;
			int height = graphicsAlgorithm.getHeight() - 2 * super.textMargin
					- multipleOffset;

			ga.setLocationAndSize(text, x, y, width, height);
		}
	}

	@Override
	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.fmc.blockdiagram.editor.node.RotatableNode#getAngle(org.eclipse.graphiti
	 * .mm.algorithms.GraphicsAlgorithm)
	 */
	public int getAngle(GraphicsAlgorithm graphicsAlgorithm) {
		return 0;
	}

	@Override
	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.fmc.blockdiagram.editor.node.RotatableNode#isFlipped(org.eclipse.
	 * graphiti.mm.algorithms.GraphicsAlgorithm)
	 */
	public boolean isFlipped(GraphicsAlgorithm graphicsAlgorithm) {
		return false;
	}

	@Override
	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.fmc.blockdiagram.editor.node.RotatableNode#rotate90Right(org.eclipse
	 * .graphiti.mm.algorithms.GraphicsAlgorithm)
	 */
	public void rotate90Right(GraphicsAlgorithm graphicsAlgorithm) {
		translateForRotation(graphicsAlgorithm);
		doRotate(graphicsAlgorithm);
		relocateText(graphicsAlgorithm);
		for (GraphicsAlgorithm algorithm : graphicsAlgorithm
				.getGraphicsAlgorithmChildren()) {
			doRotate(algorithm);
		}
	}

	@Override
	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.fmc.blockdiagram.editor.node.RotatableNode#flipHorizontally(org.eclipse
	 * .graphiti.mm.algorithms.GraphicsAlgorithm)
	 */
	public void flipHorizontally(GraphicsAlgorithm graphicsAlgorithm) {

	}

	@Override
	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.fmc.blockdiagram.editor.node.RotatableNode#flipVertically(org.eclipse
	 * .graphiti.mm.algorithms.GraphicsAlgorithm)
	 */
	public void flipVertically(GraphicsAlgorithm graphicsAlgorithm) {
	}

	/**
	 * Moves algorithm to the point to simulate rotation around center.
	 * 
	 * @param graphicsAlgorithm
	 *            Algorithm to translate.
	 */
	protected void translateForRotation(GraphicsAlgorithm graphicsAlgorithm) {
		graphicsAlgorithm
				.setX(graphicsAlgorithm.getX()
						+ (graphicsAlgorithm.getWidth() - graphicsAlgorithm
								.getHeight()) / 2);
		graphicsAlgorithm
				.setY(graphicsAlgorithm.getY()
						- (graphicsAlgorithm.getWidth() - graphicsAlgorithm
								.getHeight()) / 2);
	}

	/**
	 * Rotates algorithm by simply switching width and height.
	 * 
	 * @param graphicsAlgorithm
	 *            Algorithm to rotate.
	 */
	protected void doRotate(GraphicsAlgorithm graphicsAlgorithm) {
		int width = graphicsAlgorithm.getWidth();
		graphicsAlgorithm.setWidth(graphicsAlgorithm.getHeight());
		graphicsAlgorithm.setHeight(width);
	}

}