/*
 * This program is free software; you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
 * Foundation.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
 * or from the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * This program 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.
 *
 * Copyright (c) 2000 - 2009 Pentaho Corporation, Object Refinery Limited and Contributors.  All rights reserved.
 */

package org.pentaho.reporting.libraries.pixie.wmf.records;

import java.awt.Graphics2D;
import java.awt.Polygon;

import org.pentaho.reporting.libraries.pixie.wmf.MfDcState;
import org.pentaho.reporting.libraries.pixie.wmf.MfRecord;
import org.pentaho.reporting.libraries.pixie.wmf.MfType;
import org.pentaho.reporting.libraries.pixie.wmf.WmfFile;

/**
 * The Polygon function draws a polygon consisting of two or more vertices connected by
 * straight lines. The polygon is outlined by using the current pen and filled by using
 * the current brush and polygon fill mode.
 */
public class MfCmdPolygon extends MfCmd
{
  private int[] points_x;
  private int[] points_y;
  private int[] scaled_points_x;
  private int[] scaled_points_y;
  private int count;

  public MfCmdPolygon()
  {
  }

  /**
   * Replays the command on the given WmfFile.
   *
   * @param file the meta file.
   */
  public void replay(final WmfFile file)
  {
    final Graphics2D graph = file.getGraphics2D();

    final Polygon polygon = new Polygon(getScaledPointsX(), getScaledPointsY(), getPointCount());
    final MfDcState state = file.getCurrentState();

    if (state.getLogBrush().isVisible())
    {
      state.preparePaint();
      graph.fill(polygon);
      state.postPaint();
    }
    if (state.getLogPen().isVisible())
    {
      state.prepareDraw();
      graph.draw(polygon);
      state.postDraw();
    }
  }

  /**
   * Creates a empty unintialized copy of this command implementation.
   *
   * @return a new instance of the command.
   */
  public MfCmd getInstance()
  {
    return new MfCmdPolygon();
  }

  /**
   * Reads the function identifier. Every record type is identified by a function number
   * corresponding to one of the Windows GDI functions used.
   *
   * @return the function identifier.
   */
  public int getFunction()
  {
    return MfType.POLYGON;
  }

  public String toString()
  {
    final StringBuffer b = new StringBuffer();
    b.append("[POLYGON] count=");
    b.append(getPointCount());
    final int l = getPointCount();
    final int[] points_x = getPointsX();
    final int[] points_y = getPointsY();

    for (int i = 0; i < l; i++)
    {
      if (i != 0)
      {
        b.append(',');
      }

      b.append(" (");
      b.append(points_x[i]);
      b.append(',');
      b.append(points_y[i]);
      b.append(") ");
    }
    return b.toString();
  }

  /**
   * Reads the command data from the given record and adjusts the internal parameters
   * according to the data parsed.
   * <p/>
   * After the raw record was read from the datasource, the record is parsed by the
   * concrete implementation.
   *
   * @param record the raw data that makes up the record.
   */
  public void setRecord(final MfRecord record)
  {
    final int count = record.getParam(0);
    final int[] points_x = new int[count];
    final int[] points_y = new int[count];

    for (int i = 0; i < count; i++)
    {
      points_x[i] = record.getParam(1 + 2 * i);
      points_y[i] = record.getParam(2 + 2 * i);
    }
    setPointCount(count);
    setPoints(points_x, points_y);
  }

  /**
   * Creates a new record based on the data stored in the MfCommand.
   *
   * @return the created record.
   */
  public MfRecord getRecord()
      throws RecordCreationException
  {
    final MfRecord record = new MfRecord(getPointCount() * 2 + 1);
    final int count = getPointCount();
    final int[] points_x = getPointsX();
    final int[] points_y = getPointsY();

    record.setParam(0, count);

    for (int i = 0; i < count; i++)
    {
      record.setParam(1 + 2 * i, points_x[i]);
      record.setParam(2 + 2 * i, points_y[i]);
    }
    return record;
  }

  public void setPointCount(final int count)
  {
    this.count = count;
  }

  public void setPoints(final int[] points_x, final int[] points_y)
  {
    this.points_x = points_x;
    this.points_y = points_y;
    scaleXChanged();
    scaleYChanged();
  }

  public int[] getPointsX()
  {
    return points_x;
  }

  public int[] getPointsY()
  {
    return points_y;
  }

  public int[] getScaledPointsX()
  {
    return scaled_points_x;
  }

  public int[] getScaledPointsY()
  {
    return scaled_points_y;
  }

  public int getPointCount()
  {
    return count;
  }

  /**
   * A callback function to inform the object, that the x scale has changed and the
   * internal coordinate values have to be adjusted.
   */
  protected void scaleXChanged()
  {
    scaled_points_x = applyScaleX(points_x, scaled_points_x);
  }

  /**
   * A callback function to inform the object, that the y scale has changed and the
   * internal coordinate values have to be adjusted.
   */
  protected void scaleYChanged()
  {
    scaled_points_y = applyScaleY(points_y, scaled_points_y);
  }
}
