Calculate minimal sub-rectangle for the overlay text. Notes: Because 'insert_textbox' supports no vertical text centering, we calculate an approximate number of lines here and return a sub-rect with smaller height, which should still be sufficient.
(annot_rect, text, font, fsize)
| 4057 | """ |
| 4058 | |
| 4059 | def center_rect(annot_rect, text, font, fsize): |
| 4060 | """Calculate minimal sub-rectangle for the overlay text. |
| 4061 | |
| 4062 | Notes: |
| 4063 | Because 'insert_textbox' supports no vertical text centering, |
| 4064 | we calculate an approximate number of lines here and return a |
| 4065 | sub-rect with smaller height, which should still be sufficient. |
| 4066 | Args: |
| 4067 | annot_rect: the annotation rectangle |
| 4068 | text: the text to insert. |
| 4069 | font: the fontname. Must be one of the CJK or Base-14 set, else |
| 4070 | the rectangle is returned unchanged. |
| 4071 | fsize: the fontsize |
| 4072 | Returns: |
| 4073 | A rectangle to use instead of the annot rectangle. |
| 4074 | """ |
| 4075 | if not text: |
| 4076 | return annot_rect |
| 4077 | try: |
| 4078 | text_width = get_text_length(text, font, fsize) |
| 4079 | except ValueError: # unsupported font |
| 4080 | return annot_rect |
| 4081 | line_height = fsize * 1.2 |
| 4082 | limit = annot_rect.width |
| 4083 | h = math.ceil(text_width / limit) * line_height # estimate rect height |
| 4084 | if h >= annot_rect.height: |
| 4085 | return annot_rect |
| 4086 | r = annot_rect |
| 4087 | y = (annot_rect.tl.y + annot_rect.bl.y - h) * 0.5 |
| 4088 | r.y0 = y |
| 4089 | return r |
| 4090 | |
| 4091 | CheckParent(page) |
| 4092 | doc = page.parent |
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