bundles/org.eclipse.draw2d/src/org/eclipse/draw2d/graph/VerticalPlacement.java

/*******************************************************************************
 * Copyright (c) 2003, 2010 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.draw2d.graph;

import org.eclipse.draw2d.geometry.Insets;

/**
 * Assigns the Y and Height values to the nodes in the graph. All nodes in the
 * same row are given the same height.
 * 
 * @author Randy Hudson
 * @since 2.1.2
 */
class VerticalPlacement extends GraphVisitor {

	void visit(DirectedGraph g) {
		Insets pad;
		int currentY = g.getMargin().top;
		int row, rowHeight;
		g.rankLocations = new int[g.ranks.size() + 1];
		for (row = 0; row < g.ranks.size(); row++) {
			g.rankLocations[row] = currentY;
			Rank rank = g.ranks.getRank(row);
			rowHeight = 0;
			rank.topPadding = rank.bottomPadding = 0;
			for (int n = 0; n < rank.size(); n++) {
				Node node = rank.getNode(n);
				pad = g.getPadding(node);
				rowHeight = Math.max(node.height, rowHeight);
				rank.topPadding = Math.max(pad.top, rank.topPadding);
				rank.bottomPadding = Math.max(pad.bottom, rank.bottomPadding);
			}
			currentY += rank.topPadding;
			rank.setDimensions(currentY, rowHeight);
			currentY += rank.height + rank.bottomPadding;
		}
		g.rankLocations[row] = currentY;
		g.size.height = currentY;
	}

}