[英]Generate PDF using Reportlab with custom size page and best image resolution
[英]Page size issue PDF creation of barcodes using reportlab
好的,我今天创建了一个脚本,该脚本为此目的使用一个项目号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,我通过自定义大小的页面(900 * 850)成功实现了该功能,并安装了reportlab code128生成的15行4列条形码。
这是代码:
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()
问题是,现在我只能使用美国字母大小,而不能使用其他自定义大小。 我尝试了几种变体,但没有奏效。
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()
这是它必须适合的必需格式。很高兴能提供帮助。
您的代码需要大量改进
from reportlab.lib.pagesizes import letter
的字母大小 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的宽度值是代码条中单个条的宽度,而不是整个代码条中的宽度,您应将此值保持在1.1以下
bar_height = bars_height - font_size bar_width = 1
这样您的循环会更好:
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)
这是最终的脚本:
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()
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