content: // ===============================================================================
  // Authors: AFRL/RQQD
  // Organization: Air Force Research Laboratory, Aerospace Systems Directorate, Power and Control Division
  // 
  // Copyright (c) 2017 Government of the United State of America, as represented by
  // the Secretary of the Air Force.  No copyright is claimed in the United States under
  // Title 17, U.S. Code.  All Other Rights Reserved.
  // ===============================================================================
  
  /*
   * GRAL: GRAphing Library for Java(R)
   *
   * (C) Copyright 2009-2013 Erich Seifert <dev[at]erichseifert.de>,
   * Michael Seifert <mseifert[at]error-reports.org>
   *
   * This file is part of GRAL.
   *
   * GRAL is free software: you can redistribute it and/or modify
   * it under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation, either version 3 of the License, or
   * (at your option) any later version.
   *
   * GRAL 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.
   *
   * You should have received a copy of the GNU Lesser General Public License
   * along with GRAL.  If not, see <http://www.gnu.org/licenses/>.
   */
  package de.erichseifert.gral.plots.points;
  
  import java.awt.Shape;
  import java.awt.geom.AffineTransform;
  
  import de.erichseifert.gral.data.Row;
  import de.erichseifert.gral.util.DataUtils;
  import de.erichseifert.gral.util.MathUtils;
  
  
  /**
   * Class that provides {@code Drawable}s, which are sized accordingly to
   * the data.
   */
  public class SizeablePointRenderer extends DefaultPointRenderer2D {
  	/** Version id for serialization. */
  	private static final long serialVersionUID = 3276439387457161307L;
  
  	/** Index of the column for the point size. */
  	private int column;
  
  	/**
  	 * Initializes a new object.
  	 */
  	public SizeablePointRenderer() {
  		column = 2;
  	}
  
  	/**
  	 * Returns the index of the column which is used for point sizes.
  	 * @return index of the column which is used for point sizes.
  	 */
  	public int getColumn() {
  		return column;
  	}
  
  	/**
  	 * Sets the index of the column which will be used for point sizes.
  	 * @param column Index of the column which will be used for point sizes.
  	 */
  	public void setColumn(int column) {
  		this.column = column;
  	}
  
  	@Override
  	public Shape getPointShape(PointData data) {
  		Shape shape = getShape();
  
  		Row row = data.row;
  		int colSize = getColumn();
  		if (colSize >= row.size() || colSize < 0 || !row.isColumnNumeric(colSize)) {
  			return shape;
  		}
  
  		double size = DataUtils.getValueOrDefault((Number) row.get(colSize), Double.NaN);
  		if (!MathUtils.isCalculatable(size) || size <= 0.0) {
  			return null;
  		}
  
  		if (size != 1.0) {
  			AffineTransform tx = AffineTransform.getScaleInstance(size, size);
  			shape = tx.createTransformedShape(shape);
  		}
  		return shape;
  	}
  }
  