/**
* Adds an element to the plotarea
*
* @param Image_Graph_Element $element The element to add
* @param int $axis The axis to associate the element with, either
* IMAGE_GRAPH_AXIS_X, IMAGE_GRAPH_AXIS_Y, IMAGE_GRAPH_AXIS_Y_SECONDARY
* or the shorter string notations 'x', 'y' or 'ysec' (defaults to
* IMAGE_GRAPH_AXIS_Y)
* @return Image_Graph_Element The added element
* @see Image_Graph_Common::add()
*/
function &add(&$element, $axis = IMAGE_GRAPH_AXIS_Y)
{
if ($axis == 'x') {
$axis = IMAGE_GRAPH_AXIS_X;
}
if ($axis == 'y') {
$axis = IMAGE_GRAPH_AXIS_Y;
}
if ($axis == 'ysec') {
$axis = IMAGE_GRAPH_AXIS_Y_SECONDARY;
}
if ($axis == IMAGE_GRAPH_AXIS_Y_SECONDARY && $this->_axisYSecondary == null) {
$this->_axisYSecondary =& Image_Graph::factory('axis', IMAGE_GRAPH_AXIS_Y_SECONDARY);
$this->_axisYSecondary->_setMinimum(0);
if ($this->_horizontal) {
$this->_axisYSecondary->_transpose = true;
}
}
parent::add($element);
if (is_a($element, 'Image_Graph_Plot')) {
$element->_setAxisY($axis);
// postpone extrema calculation until we calculate coordinates
//$this->_setExtrema($element);
} elseif (is_a($element, 'Image_Graph_Grid')) {
switch ($axis) {
case IMAGE_GRAPH_AXIS_X:
if ($this->_axisX != null) {
$element->_setPrimaryAxis($this->_axisX);
if ($this->_axisY != null) {
$element->_setSecondaryAxis($this->_axisY);
}
}
break;
case IMAGE_GRAPH_AXIS_Y:
if ($this->_axisY != null) {
$element->_setPrimaryAxis($this->_axisY);
if ($this->_axisX != null) {
$element->_setSecondaryAxis($this->_axisX);
}
}
break;
case IMAGE_GRAPH_AXIS_Y_SECONDARY:
if ($this->_axisYSecondary != null) {
$element->_setPrimaryAxis($this->_axisYSecondary);
if ($this->_axisX != null) {
$element->_setSecondaryAxis($this->_axisX);
}
}
break;
}
} elseif (is_a($element, 'Image_Graph_Axis')) {
switch ($element->_type) {
case IMAGE_GRAPH_AXIS_X:
$this->_axisX =& $element;
break;
case IMAGE_GRAPH_AXIS_Y:
$this->_axisY =& $element;
break;
case IMAGE_GRAPH_AXIS_Y_SECONDARY:
$this->_axisYSecondary =& $element;
break;
}
if ($element->_getMinimum() == $element->_getMaximum()) {
$element->_setMinimum(0);
$element->_setMaximum(1);
}
}
return $element;
}
