页面大小问题 使用 reportlab 创建条形码的 PDF [英] Page size issue PDF creation of barcodes using reportlab

问题描述

好的，我今天创建了一个脚本，该脚本使用 item# 或任何数字来生成条形码.现在我想在 4 列中打印 60 个相同的条形码，这将使其成为 (15 X 4) 的矩阵，仅使其易于理解.现在我使用自定义大小的页面(900 * 850)成功实现了它，并安装在由 reportlab code128 生成的 15 行和 4 列条形码中.

Okay i created a script today that takes an item# or any number for that purpose to generate a barcode. Now i wanted to print 60 same barcodes in 4 columns, that would make it a matrix of (15 X 4) only making it easy to understand. Now i successfully achieved it with a custom sized page (900*850) and fitted in 15 rows and 4 columns of barcodes generated by reportlab code128.

代码如下:

from reportlab.graphics.barcode import code128
from reportlab.lib.units import mm
from reportlab.pdfgen import canvas

#----------------------------------------------------------------------#
def createBarCodes():
    codeName = "NOT_C17"

    c = canvas.Canvas(codeName+".pdf")
    c.setPageSize((900, 850))

    barcode_value = codeName
    barcode128 = code128.Code128(
                            barcode_value,
                            barHeight=20,
                            barWidth=1.05,
                            fontSize=15,
                            humanReadable = True
                        )

    x = 15 * mm
    for i in range(4):
        y = 275 * mm
        i=0
        while i < 15:
            barcode128.drawOn(c, x, y)
            y = y - 18 * mm
            i+=1
        x=x+(70*mm)
    c.save()

if __name__ == "__main__":
    createBarCodes()

此脚本生成的文件

问题是现在我只能使用美国 Letter 尺寸而不能使用其他自定义尺寸.我尝试了一些变体，但没有一个奏效.

The issue is that now I am restricted to using only US Letter size and no other custom size. I tried few variations but none worked.

尝试:

from reportlab.lib.pagesizes import letter
c = canvas.Canvas(codeName+".pdf", pagesize=letter)

barcode_value = codeName
barcode128 = code128.Code128(
                          barcode_value,
                          barHeight=16.7564*mm,
                          barWidth=44.45*mm,
                          fontSize=15,
                          humanReadable = True
                     )

x = 7.526 * mm
for i in range(4):
    y = 265.524 * mm
    i=0
    while i < 15:
        barcode128.drawOn(c, x, y)
        y = y - 18 * mm
        i+=1
        break
    x=x+(70*mm)
    break
c.save()

和 这里 是它必须适合的所需格式.如果能帮到你就好了.

and here is the required format that it must fit in. Would be nice to have to help.

推荐答案

你的代码需要大量改进

1. 使用字母大小from reportlab.lib.pagesizes import letter

2. 按照文档中的指定设置您的边距和其他变量:

1. Use the letter size from reportlab.lib.pagesizes import letter

2. Set your margins and other variables as specified in the document :

margin_x        =  7.526
margin_y        =  13.876
padding_x       =  7.526
font_size       =  15
width, height   =  letter

计算生成的codebar的总大小

Calculate the total size of the generated codebar

bars_width   = (float(width-margin_x*2)-3*padding_x)/4
bars_height  = float(height-margin_y*2)/15

传递给函数 Code128 的宽度值是代码条中单个条的宽度，而不是整个代码条的宽度，您应该将此值保持在 1.1 以下

The width value passed to the function Code128 is the width of a single bar within the codebar and not the whole codebar, you should keep this value below 1.1

bar_height   = bars_height - font_size
bar_width    = 1

这样你的循环会更好:

your loops would be better this way :

for i in range(0,4):
    for j in range(0,15):
        x = margin_x + i * (bars_width+padding_x)
        y = margin_y + j * bars_height
        barcode128.drawOn(c, x , y)

这是最终的脚本:

this is the final script :

from reportlab.graphics.barcode import code128
from reportlab.lib.units import mm
from reportlab.pdfgen import canvas
from reportlab.lib.pagesizes import letter

#----------------------------------------------------------------------#
def createBarCodes():
    codeName = "NOT_C17"

    c = canvas.Canvas(codeName+".pdf",pagesize=letter)

    margin_x        =  7.526
    margin_y        =  13.876
    padding_x       =  7.526
    font_size       =  15
    width, height   =  letter
    extra_padding   =  20

    bars_width   = (float(width-margin_x*2)-3*padding_x)/4
    bars_height  = float(height-margin_y*2)/15

    bar_height   = bars_height - font_size
    #For alphanumeric values, the total number of bars is calculated as:
    #total = (11*string_length+35)
    bar_width    = (bars_width-extra_padding)/(len(codeName)*11+35)


    barcode_value = codeName
    barcode128 = code128.Code128(
                            barcode_value,
                            barHeight=bar_height,
                            barWidth=bar_width,
                            humanReadable = True
                        )

    for i in range(0,4):
        for j in range(0,15):
            x = margin_x + i * (bars_width+padding_x)
            y = margin_y + j * bars_height
            barcode128.drawOn(c, x , y)

    c.save()

if __name__ == "__main__":
    createBarCodes()

这篇关于页面大小问题 使用 reportlab 创建条形码的 PDF的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！