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/****************************************************************************
Copyright 2004, Colorado School of Mines and others.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
****************************************************************************/
package edu.mines.jtk.sgl;

import static edu.mines.jtk.ogl.Gl.*;

/**
 * OpenGL point state.
 * @author Dave Hale, Colorado School of Mines
 * @version 2005.05.31
 */
public class PointState implements State {

  /**
   * Constructs point state.
   */
  public PointState() {
  }

  /**
   * Determines whether point smooth is set.
   * @return true, if set; false, otherwise.
   */
  public boolean hasSmooth() {
    return _smoothSet;
  }

  /**
   * Gets the point smooth.
   * @return the point smooth.
   */
  public boolean getSmooth() {
    return _smooth;
  }

  /**
   * Sets the point smooth.
   * @param smooth the smooth.
   */
  public void setSmooth(boolean smooth) {
    _smooth = smooth;
    _smoothSet = true;
  }

  /**
   * Unsets the point smooth.  
   */
  public void unsetSmooth() {
    _smooth = _smoothDefault;
    _smoothSet = false;
  }

  /**
   * Determines whether point size is set.
   * @return true, if set; false, otherwise.
   */
  public boolean hasSize() {
    return _sizeSet;
  }

  /**
   * Gets the point size.
   * @return the point size.
   */
  public float getSize() {
    return _size;
  }

  /**
   * Sets the point size.
   * @param size the size.
   */
  public void setSize(float size) {
    _size = size;
    _sizeSet = true;
  }

  /**
   * Unsets the point size.  
   */
  public void unsetSize() {
    _size = _sizeDefault;
    _sizeSet = false;
  }

  public void apply() {
    if (_smoothSet) {
      if (_smooth) {
        glEnable(GL_POINT_SMOOTH);
      } else {
        glDisable(GL_POINT_SMOOTH);
      }
    }
    if (_sizeSet)
      glPointSize(_size);
  }

  public int getAttributeBits() {
    return GL_ENABLE_BIT | GL_POINT_BIT;
  }

  private static boolean _smoothDefault = false;
  private boolean _smooth = _smoothDefault;
  private boolean _smoothSet;

  private static float _sizeDefault = 1.0f;
  private float _size = _sizeDefault;
  private boolean _sizeSet;
}