def _trunc_label(self, text, period_size):
""" trunc a period's label depending on the size of the period
"period_size" is an integer: the number of scale items between period's start and period's end dates
"""
if text == None :
return ""
if len(text) <= 1:
return text
# find the width of a column
columns_width = self._compute_columns_widths(self.table)
column_width = columns_width[1]
period_width = column_width * period_size
string_width = stringWidth(text, self.DEFAULT_FONT, self.DEFAULT_FONT_SIZE)
margin_width = stringWidth(" .", self.DEFAULT_FONT, self.DEFAULT_FONT_SIZE)
cpt = len(text)
#if the width of the text is greater than the width of the period, try to remove a char at the end and start again.
#TOOD: could be improved to do less loops (dichotomic tests...)
tmp_text = text
while cpt > 1 and string_width + margin_width > period_width:
cpt -= 1
#string from db are encoded in utf8....
tmp_text = text.decode('utf-8')
#... but text operation are ascii...
tmp_text= tmp_text[0:cpt]
# ... and reportlab work in utf8 too....
tmp_text = tmp_text.encode('utf-8')
string_width = stringWidth(tmp_text, self.DEFAULT_FONT, self.DEFAULT_FONT_SIZE)
result = tmp_text
#add a final . to truncated texts
if cpt < len(text):
result += "."
return result
def _compute_columns_widths(self):
"""construct the list of column widths. """
columns_width = []
if self.title != None:
title_length = stringWidth(self.title, self.DEFAULT_FONT, self.DEFAULT_FONT_SIZE)+10 #add 10 to include margins
columns_width.append(title_length)
total_width = self.width-title_length
if len(self.items_order):
columns_width += len(self.items_order) * [total_width / len(self.items_order)]
else:
columns_width = total_width
return columns_width
