/**
* IdmlGroups do not have <PathGeometry> or <GeometricBounds> so their overall bounds must be determined
* after reading all children by getting the outer bounds of all encompassed children.
* The true bounds of the children must take into account their transformation: their true boundaries are
* determined by call IdmlBoundary::transform.
* Once the group's absolute boundary is computed from the children's boundaries, the group's own transformation
* must be accounted for by subtracting the tx and ty from the boundary points.
*/
public function determineBounds()
{
$boundary = null;
foreach ($this->childrenElements as $child) {
// If the child's boundary is not set, go to the next child.
if (!isset($child->boundary)) {
continue;
}
$childBoundary = IdmlBoundary::transform($child->boundary, $child->transformation);
// For the first child's boundary, duplicate it
if (is_null($boundary)) {
$boundary = new IdmlBoundary($childBoundary->top, $childBoundary->left, $childBoundary->bottom, $childBoundary->right);
continue;
}
// Add the child's dimensions to the group's boundary.
if (get_class($child) == 'IdmlTextFrame') {
// Add the height of the text frame, which stacks vertically.
$boundary->bottom += $childBoundary->getHeight();
} else {
// Use that new boundary to expand the bounds of the group.
$boundary->encompass($childBoundary);
}
}
// Now subtract the group's tx and ty from the boundary points to determine its actual position.
$top = $boundary->top - $this->transformation->yTranslate();
$left = $boundary->left - $this->transformation->xTranslate();
$bottom = $boundary->bottom - $this->transformation->yTranslate();
$right = $boundary->right - $this->transformation->xTranslate();
$this->boundary = new IdmlBoundary($top, $left, $bottom, $right);
}
