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/**
 * Sencha GXT 3.1.1 - Sencha for GWT
 * Copyright(c) 2007-2014, Sencha, Inc.
 * [email protected]
 *
 * http://www.sencha.com/products/gxt/license/
 */
package com.sencha.gxt.chart.client.draw.path;

import java.util.Collections;
import java.util.List;

import com.sencha.gxt.core.client.util.PrecisePoint;

/**
 * A {@link PathCommand} that represents a line.
 */
public class LineTo extends EndPointCommand {

  private String absoluteName = "L";
  private String relativeName = "l";

  /**
   * Creates a line {@link PathCommand}. Defaults to absolute.
   */
  public LineTo() {
  }

  /**
   * Creates a line {@link PathCommand} using the given coordinates. Defaults to
   * absolute.
   * 
   * @param x the x-coordinate of the end point of the line
   * @param y the y-coordinate of the end point of the line
   */
  public LineTo(double x, double y) {
    super(x, y);
  }

  /**
   * Creates a line {@link PathCommand} using the given coordinates.
   * 
   * @param x the x-coordinate of the end point of the line
   * @param y the y-coordinate of the end point of the line
   * @param relative true if the command is relative
   */
  public LineTo(double x, double y, boolean relative) {
    super(x, y, relative);
  }

  /**
   * Creates a copy of the given line {@link PathCommand}.
   * 
   * @param command the command to be copied
   */
  public LineTo(LineTo command) {
    super(command);
  }

  @Override
  public LineTo copy() {
    return new LineTo(this);
  }

  @Override
  public boolean nearEqual(PathCommand command) {
    if (!(command instanceof LineTo)) {
      return false;
    }
    LineTo line = (LineTo) command;
    if (Math.round(this.getX()) != Math.round(line.getX())) {
      return false;
    }
    if (Math.round(this.getY()) != Math.round(line.getY())) {
      return false;
    }

    return true;
  }

  @Override
  public List toCurve(PrecisePoint currentPoint, PrecisePoint movePoint, PrecisePoint curvePoint,
      PrecisePoint quadraticPoint) {
    quadraticPoint.setX(currentPoint.getX());
    quadraticPoint.setY(currentPoint.getY());
    return Collections.singletonList(new CurveTo(
            currentPoint.getX(), currentPoint.getY(),
            this.getX(), this.getY(),
            this.getX(), this.getY())
    );
  }

  @Override
  public String toString() {
    StringBuilder build = new StringBuilder();
    if (!relative) {
      build.append(absoluteName);
    } else {
      build.append(relativeName);
    }
    build.append(x).append(",").append(y);
    return build.toString();
  }

  @Override
  public void appendTo(StringBuilder build) {
    if (!relative) {
      build.append(absoluteName);
    } else {
      build.append(relativeName);
    }
    build.append(x).append(",").append(y);
  }

}