PYFPDF:使用多单元调整单元高度

Question

我有一个问题，根据多单元格的高度来调整单元格的高度，这个多单元格会根据字数和宽度来改变其高度。我正在测试的代码如下。

datos = ["hola","Esto es el texto que determina el tamaño"]
pdf = FPDF()
pdf.add_page()
pdf.set_font('Arial', 'B', 8)
line_height = pdf.font_size * 2.5
t = 0
lh_list = [] #list with proper line_height for each row #flag
a = []

#create lh_list of line_heights which size is equal to num rows of data
for row in datos:
x = row.split()
f = len(x)
a.append(f)
if f>1:
alto = line_height
lh_list.append(alto)
else:
lh_list.append(line_height)
print(lh_list)
print(a)
for j,row in enumerate(datos):
if a[j]>1:
pdf.multi_cell(40,lh_list[j],row,1,'J')
else:
pdf.cell(40,lh_list[j]*2,row,1,0,'J')
pdf.output('table_with_cells.pdf')

结果是：结果

并且期望的结果是：预期结果

Answer 1

您使用multi_cell的split_only参数来计算文本的每个单元格所需的行数。有了这些信息，您可以正确地计算每个单元格的确切位置。请注意，max_line_height参数必须理解为单元格每行的行高。这意味着，如果内容需要在要打印的单元格中打印1-3行，则值为3将导致单元格具有3、6或9mm的高度。

from fpdf import FPDF

def pt2mm(points: int) -> float:
"""calculates size from points (eg. font size) to mm
Parameters
----------
pt : int
size in points
Returns
-------
float
size in mm
"""
return 0.3528 * points
pdf = FPDF()
pdf.add_page()
default_font_size = 8
pdf.set_font('helvetica', 'B', default_font_size)
line_height = default_font_size * 1.1
line_oversize = line_height - default_font_size
print(f'{default_font_size} -> {line_height} -> {line_oversize}')
table_data = [
("hola", "Esto es el texto que determina el tamaño"),
("hola hola hola hola hola", "Esto es el texto que determina el tamaño"),
("hola hola hola hola hola ", "Esto es el texto"),
("hola hola ", "Esto es el texto"),
]
col_widths = (30, 50)
col_align = ('L', 'L')
x_val_first_col = pdf.get_x()  # we have to draw the cell border by ourself, need start point coordination
for row in table_data:
# check if any cell in this row has line breaks, saves maximum lines and calculate height and somem positions
max_n = 1
for col_width, row_data in zip(col_widths, row):
max_n = max(max_n, len(pdf.multi_cell(w=col_width, txt=row_data, split_only=True)))
row_height = (max_n + line_oversize) * pt2mm(default_font_size)
row_y_top = pdf.get_y() + line_oversize / 2 * pt2mm(default_font_size)
row_y_bottom = pdf.get_y() + row_height
# draw each cell by itself
for col_width, cell_data, cell_align in zip(col_widths, row, col_align):
n_cell = len(pdf.multi_cell(w=col_width, txt=cell_data, split_only=True))
if n_cell < max_n:
y_cell_shift = (max_n - n_cell) * pt2mm(default_font_size) / 2
else:
y_cell_shift = 0
cell_y_top = row_y_top + y_cell_shift
pdf.set_xy(pdf.get_x(), cell_y_top)
pdf.multi_cell(w=col_width, txt=cell_data, border=0, align=cell_align, new_x='RIGHT')
# draw the horizontal line and return curser
pdf.line(x1=x_val_first_col, y1=row_y_bottom, x2=x_val_first_col+sum(col_widths), y2=row_y_bottom)
pdf.set_xy(x=x_val_first_col, y=row_y_bottom)
pdf.output('example.pdf')

单元格的边界需要单独绘制。在我的例子中，我只画水平线。要理解为什么必须这样做，只需在我的示例中将border=0更改为border=1即可。