//////////////////////////////////////////////////////////////////////////////////////////////////
// GetParagraphBBox
// get the text state of the text objects inside paragraph by iterating content kid objects
//////////////////////////////////////////////////////////////////////////////////////////////////
private static bool GetStructElementBBox(PdsStructElement struct_elem, ref PdfRect bbox)
{
bool result = false;
for (int i = 0; i < struct_elem.GetNumChildren(); i++)
{
if (struct_elem.GetChildType(i) == PdfStructElementType.kPdsStructChildPageContent)
{
// acquire page on which the element is present
PdfDoc doc = struct_elem.GetStructTree().GetDoc();
PdfPage page = doc.AcquirePage(struct_elem.GetChildPageNumber(i));
// find text object with mcid on the page to get the text state
int mcid = struct_elem.GetChildMcid(i);
var content = page.GetContent();
for (int j = 0; j < content.GetNumObjects(); j++)
{
PdsPageObject page_object = content.GetObject(j);
// check if this text page object has the same mcid
PdsContentMark content_mark = page_object.GetContentMark();
if (content_mark != null && content_mark.GetTagMcid() == mcid)
{
PdfRect elem_bbox = page_object.GetBBox();
if ((bbox.left - bbox.right == 0) || (bbox.top - bbox.bottom == 0))
{
bbox = elem_bbox;
}
else
{
bbox.left = Math.Min(bbox.left, elem_bbox.left);
bbox.right = Math.Max(bbox.right, elem_bbox.right);
bbox.top = Math.Max(bbox.top, elem_bbox.top);
bbox.bottom = Math.Min(bbox.bottom, elem_bbox.bottom);
}
result = true;
}
}
}
else if (struct_elem.GetChildType(i) == PdfStructElementType.kPdsStructChildElement)
{
PdsObject kid_obj = struct_elem.GetChildObject(i);
PdsStructElement kid_elem = struct_elem.GetStructTree().GetStructElementFromObject(kid_obj);
GetStructElementBBox(kid_elem, ref bbox);
}
}
return(result);
}
// collect all bounding boxes of the page object with specified mcid
static List <PdfRect> GetMcidBBoxes(PdsPageObject obj, int mcid)
{
var bboxes = new List <PdfRect>();
// check object mcid
var content_mark = obj.GetContentMark();
if (content_mark != null && content_mark.GetTagMcid() == mcid)
{
bboxes.Add(obj.GetBBox());
}
else
{
if (obj.GetObjectType() == PdfPageObjectType.kPdsPageForm)
{
var form_obj = (PdsForm)obj;
for (var i = 0; i < form_obj.GetNumPageObjects(); i++)
{
bboxes.AddRange(GetMcidBBoxes(form_obj.GetPageObject(i), mcid));
}
}
}
return(bboxes);
}