// -----------------------------------------------------------------
//								 ArcWeb USA Site Starters 
//            Environmental Systems Research Institute
//                   Redlands, CA
// -----------------------------------------------------------------
// Class    : rect 
// Purpose  : Provides a rectangle class.
// -----------------------------------------------------------------
// Calls    :
// Called by:
// -----------------------------------------------------------------
// Arguments:
// Globals  :
// Returns  :
// -----------------------------------------------------------------
// Notes    :
// -----------------------------------------------------------------
// History  :
// =================================================================

function rect(x1, y1, x2, y2) {

	var m_dblLeft;
	var m_dblBottom;
	var m_dblRight;
	var m_dblTop; 

	var dblX1 = parseFloat(x1);
	var dblY1 = parseFloat(y1);
	var dblX2 = parseFloat(x2);
	var dblY2 = parseFloat(y2);

	//alert ('In Rect xMin: ' + dblX1);
	//alert ('In Rect yMin: ' + dblY1);

	if (dblX1 < dblX2) {
   	m_dblLeft = dblX1;
		m_dblRight = dblX2;
	} else  {
   	m_dblLeft = dblX2;
		m_dblRight = dblX1;
	}

	if (dblY1 < dblY2) {
		m_dblBottom = dblY1;
		m_dblTop = dblY2;
	} else {
		m_dblBottom = dblY2;
		m_dblTop = dblY1;
	}

		// methods

	this.getLeft = getLeft;
	this.getBottom = getBottom;
	this.getRight = getRight;
	this.getTop = getTop;
	this.getCenter = getCenter;
	this.getWidth = getWidth;
	this.getHeight = getHeight;
	this.scale = scale;

  // ------------------------------
  // ------- Public Methods -------
  // ------------------------------

  function getLeft() {
		return m_dblLeft;
	}

	function getBottom() {
		return m_dblBottom;
  }

  function getRight() {
		return m_dblRight;
	}

	function getTop() {
		return m_dblTop;
  }

	function getWidth() {
		return (this.getRight() - this.getLeft());
  }

	function getHeight() {
		return (this.getTop() - this.getBottom());
  }

	function scale(factor) {

		makeFromCenter(this.getCenter(),
									 this.getWidth() * factor, 
									 this.getHeight() * factor);

  }

	function getCenter() {

		var dblCenterX = this.getLeft() + (this.getWidth() / 2);
		var dblCenterY = this.getBottom() + (this.getHeight() / 2);

		return new point(dblCenterX, dblCenterY);

	}

  // ------------------------------
  // ------ Private Functions -----
  // ------------------------------

	function makeFromCenter(center, width, height) {

		m_dblLeft = center.x - (width / 2);
		m_dblRight = center.x + (width / 2);
		m_dblBottom = center.y - (height / 2);
		m_dblTop = center.y + (height / 2);

  }

}