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hocr: adjust text cursor with relative moves

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James R. Barlow 2018-03-03 02:08:52 -08:00 committed by Jim Barlow
parent 4986afca28
commit b4d66650bd
1 changed files with 14 additions and 2 deletions
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16
ocrmypdf/hocrtransform.py
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@ -215,6 +215,7 @@ class HocrTransform():
if invisibleText:
text.setTextRenderMode(3) # Invisible (indicates OCR text)
text.setTextOrigin(pt_line.x1, self.height - pt_line.y2)
elements = line.findall(
".//%sspan[@class='%s']" % (self.xmlns, elemclass))
for n, elem in enumerate(elements):
@ -245,8 +246,19 @@ class HocrTransform():
pt.x1, self.height - pt_line.y2, pt.x2 - pt.x1, line_height,
fill=0)
# set cursor to bottom left corner of bbox (adjust for dpi)
text.setTextOrigin(pt.x1, self.height - pt_line.y2)
# Adjust relative position of cursor
# This is equivalent to:
# text.setTextOrigin(pt.x1, self.height - pt_line.y2)
# but the former generates a full text reposition matrix (Tm) in the
# content stream while this issues a "offset" (Td) command.
# .moveCursor() is relative to start of the text line, where the
# "text line" means whatever reportlab defines it as. Do not use
# use .getCursor(), since moveCursor() rather unintuitively plans
# its moves relative to .getStartOfLine().
cursor = text.getStartOfLine()
dx = pt.x1 - cursor[0]
dy = (self.height - pt_line.y2) - cursor[1]
text.moveCursor(dx, dy)
# scale the width of the text to fill the width of the bbox
text.setHorizScale(