package gui;

import java.awt.geom.Line2D;
import java.util.ArrayList;
import java.util.List;

/**
 * A simple implementation of the DigitizerDocument interface that can be used to test the
 * DigitizerPanel.
 */
public class DisplayDigitizerDocument implements DigitizerDocument
{
  protected DigitizerPanel panel;
  protected List<Line2D.Double> lines = new ArrayList<Line2D.Double>();

  /**
   * @param panel
   */
  public DisplayDigitizerDocument(final DigitizerPanel panel)
  {
    this.panel = panel;
  }

  @Override
  public void addLine(final double[] start, final double[] stop)
  {
    Line2D.Double line = new Line2D.Double(start[0], start[1], stop[0], stop[1]);
    lines.add(line);
  }

  @Override
  public Line2D getClosest(final double[] point)
  {
    Line2D closest = null;
    double closestDistance = Double.MAX_VALUE;
    for (Line2D line : lines)
    {
      double distance = line.ptSegDist(point[0], point[1]);
      if (distance < closestDistance)
      {
        closest = line;
        closestDistance = distance;
      }
    }
    return closest;
  }

  @Override
  public List<Line2D.Double> getLines()
  {
    return lines;
  }

  @Override
  public void removeLine(final Line2D line)
  {
    lines.remove(line);
  }
}