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PlantUML is a component that allows to quickly write : * sequence diagram, * use case diagram, * class diagram, * activity diagram, * component diagram, * state diagram * object diagram

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/* ========================================================================
 * PlantUML : a free UML diagram generator
 * ========================================================================
 *
 * (C) Copyright 2009-2013, Arnaud Roques
 *
 * Project Info:  http://plantuml.sourceforge.net
 * 
 * This file is part of PlantUML.
 *
 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * PlantUML 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 General Public
 * License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 * Original Author:  Arnaud Roques
 * 
 * Revision $Revision: 3835 $
 *
 */
package net.sourceforge.plantuml.salt.element;

import java.util.HashSet;
import java.util.Set;

import net.sourceforge.plantuml.salt.Cell;
import net.sourceforge.plantuml.ugraphic.UGraphic;
import net.sourceforge.plantuml.ugraphic.ULine;
import net.sourceforge.plantuml.ugraphic.UTranslate;

public class Grid {

	private final double[] rowsStart;
	private final double[] colsStart;
	private final TableStrategy strategy;

	private final Set horizontals = new HashSet();
	private final Set verticals = new HashSet();

	public Grid(double[] rowsStart, double[] colsStart, TableStrategy strategy) {
		this.rowsStart = rowsStart;
		this.colsStart = colsStart;
		this.strategy = strategy;
		if (strategy == TableStrategy.DRAW_OUTSIDE || strategy == TableStrategy.DRAW_ALL) {
			addOutside();
		}
	}

	private void addOutside() {
		final int nbRow = rowsStart.length;
		final int nbCol = colsStart.length;
		for (int c = 0; c < nbCol - 1; c++) {
			horizontals.add(new Segment(0, c));
			horizontals.add(new Segment(nbRow - 1, c));
		}
		for (int r = 0; r < nbRow - 1; r++) {
			verticals.add(new Segment(r, 0));
			verticals.add(new Segment(r, nbCol - 1));
		}

	}

	public void drawU(UGraphic ug, double x, double y) {
		// Hlines
		for (Segment seg : horizontals) {
			final int row1 = seg.getRow();
			final int col1 = seg.getCol();
			final double width = colsStart[col1 + 1] - colsStart[col1];
			ug.apply(new UTranslate(x + colsStart[col1], y + rowsStart[row1])).draw(new ULine(width, 0));
		}
		// Vlines
		for (Segment seg : verticals) {
			final int row1 = seg.getRow();
			final int col1 = seg.getCol();
			final double height = rowsStart[row1 + 1] - rowsStart[row1];
			ug.apply(new UTranslate(x + colsStart[col1], y + rowsStart[row1])).draw(new ULine(0, height));
		}
	}

	public void addCell(Cell cell) {

		if (strategy == TableStrategy.DRAW_NONE) {
			return;
		}
		if (strategy == TableStrategy.DRAW_OUTSIDE) {
			return;
		}

		if (strategy == TableStrategy.DRAW_HORIZONTAL || strategy == TableStrategy.DRAW_ALL) {
			// Hlines
			for (int c = cell.getMinCol(); c <= cell.getMaxCol(); c++) {
				horizontals.add(new Segment(cell.getMinRow(), c));
				horizontals.add(new Segment(cell.getMaxRow() + 1, c));
			}
		}
		if (strategy == TableStrategy.DRAW_VERTICAL || strategy == TableStrategy.DRAW_ALL) {
			// Vlines
			for (int r = cell.getMinRow(); r <= cell.getMaxRow(); r++) {
				verticals.add(new Segment(r, cell.getMinCol()));
				verticals.add(new Segment(r, cell.getMaxCol() + 1));
			}
		}
	}
}