Question

好的我今天创建了一个脚本，它带有一个项目＃或任何数字用于生成条形码。现在我想在4列中打印60个相同的条形码，这将使它成为（15 X 4）矩阵，只是让它易于理解。现在我成功实现了自定义大小的页面（900 * 850），并且由reportlab code128生成15行和4列条形码。

以下是代码：

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()

A file generated by this script

问题在于，现在我只能使用美国字母大小而不能使用其他自定义尺寸。我尝试了一些变化，但都没有效果。

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here是它必须适合的必需格式。很高兴得到帮助。

Answer 1

您的代码需要大量改进

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

设置文档中指定的边距和其他变量：

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

计算生成的代码栏的总大小

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的宽度值是代码栏中单个条的宽度，而不是整个代码栏的宽度，您应该将此值保持在1.1以下
```
bar_height   = bars_height - font_size
bar_width    = 1
```

你的循环会更好：

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)

这是最终的剧本：

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()

页面大小问题使用reportlab创建条形码PDF

1 个答案: