reportlab 尝试

1 inch = 2.5cm

1 point = 1/72 inch

Setting the Page Size

8.5 inch = 8.5*72 = 612.0 point

1 cm = 28.34 points

from reportlab.lib.pagesizes import LETTER
canvas = Canvas("hello.pdf", pagesize=LETTER)

 

 

 

1cm=0.3937008 inch
1 inch = 2.5cm

1 point = 1/72 inch

1 inch = 72 points

Setting the Page Size

8.5 inch = 8.5*72 = 612.0 point

1 cm = 28.34 points

>>> from reportlab.lib.pagesizes import LETTER
>>> canvas = Canvas("hello.pdf", pagesize=LETTER)

A4    
210 mm x 297 mm    
21cm x 29.7cm 
21*0.3937 inch  x 29.7*0.3937 inch
8.2677 inch   x 11.69inch
21*0.3937*72 points  x  29.7*0.3937*72 points
595 points x 841points

 

 

 

drawImage的时候，x，y的0点在哪里？

左下角是（0,0）

 

一张 图片的大小建议为400像素的宽，然后高按照图像的比例进行缩放；

 

基本常识：