Reporlab 使用 class PDFImage 更改 hAline
Reporlab change hAline with the class PDFImage
大家好我是 python 的初学者,所以我还不是很了解,但这是我的问题的背景。
我正在使用 reportlab 制作一份自动报告。在此我使用 PDF 图像。为了使其兼容,我使用了这个类(有一个例子)
enter code here
class PdfImage(Flowable):
def __init__(self, filename_or_object, width=None, height=None, kind='direct'):
from reportlab.lib.units import inch
# If using StringIO buffer, set pointer to begining
if hasattr(filename_or_object, 'read'):
filename_or_object.seek(0)
page = PdfReader(filename_or_object, decompress=False).pages[0]
self.xobj = pagexobj(page)
self.imageWidth = width
self.imageHeight = height
x1, y1, x2, y2 = self.xobj.BBox
self._w, self._h = x2 - x1, y2 - y1
if not self.imageWidth:
self.imageWidth = self._w
if not self.imageHeight:
self.imageHeight = self._h
self.__ratio = float(self.imageWidth)/self.imageHeight
if kind in ['direct','absolute'] or width==None or height==None:
self.drawWidth = width or self.imageWidth
self.drawHeight = height or self.imageHeight
elif kind in ['bound','proportional']:
factor = min(float(width)/self._w,float(height)/self._h)
self.drawWidth = self._w*factor
self.drawHeight = self._h*factor
def wrap(self, aW, aH):
return self.drawWidth, self.drawHeight
def drawOn(self, canv, x, y, _sW=0):
if _sW > 0 and hasattr(self, 'hAlign'):
a = self.hAlign
if a in ('CENTER', 'CENTRE', TA_CENTER):
x += 0.5*_sW
elif a in ('RIGHT', TA_RIGHT):
x += _sW
elif a not in ('LEFT', TA_LEFT):
raise ValueError("Bad hAlign value " + str(a))
xobj = self.xobj
xobj_name = makerl(canv._doc, xobj)
xscale = self.drawWidth/self._w
yscale = self.drawHeight/self._h
x -= xobj.BBox[0] * xscale
y -= xobj.BBox[1] * yscale
canv.saveState()
canv.translate(x, y)
canv.scale(xscale, yscale)
canv.doForm(xobj_name)
canv.restoreState()
Title = "Hello world"
pageinfo = "platypus example"
def myFirstPage(canvas, doc):
canvas.saveState()
canvas.setFont('Times-Bold',16)
canvas.drawCentredString(PAGE_WIDTH/2.0, PAGE_HEIGHT-108, Title)
canvas.setFont('Times-Roman',9)
canvas.drawString(inch, 0.75 * inch, "First Page / %s" % pageinfo)
canvas.restoreState()
def myLaterPages(canvas, doc):
canvas.saveState()
canvas.setFont('Times-Roman',9)
canvas.drawString(inch, 0.75 * inch, "Page %d %s" % (doc.page, pageinfo))
canvas.restoreState()
def go():
fig = plt.figure(figsize=(4, 3))
plt.plot([1,2,3,4])
plt.ylabel('some numbers')
imgdata = io.BytesIO()
fig.savefig(imgdata,format='PDF')
doc = SimpleDocTemplate("document.pdf")
Story = [Spacer(1,2*inch)]
style = styles["Normal"]
for i in range(5):
bogustext = ("This is Paragraph number %s. " % i) *20
p = Paragraph(bogustext, style)
Story.append(p)
Story.append(Spacer(1,0.2*inch))
pi = PdfImage(imgdata)
Story.append(pi)
Story.append(Spacer(1,0.2*inch))
doc.build(Story, onFirstPage=myFirstPage, onLaterPages=myLaterPages)
go()
我的问题很简单,但我无法正确解决,如何更改 hAlin 值?当您查看代码时,似乎 os possible.
谢谢大家!很简单但很烦人
我刚看到你的问题,我想你已经解决了你的问题。否则,您应该在 PdfImage class 的 init 函数中添加一个链接到 hAlign 的参数(我不知道这是否是最佳解决方案,但它适用于我),应该看起来像这样:
class PdfImage(Flowable):
def __init__(self, img_data, width=200, height=200, align='LEFT'):
self.img_width = width
self.img_height = height
self.img_data = img_data
self.hAlign = align
(原始代码的所有其他行保持不变)。
当您使用 PdfImage 时,您只需将对齐设置为 Reportlab 的 hAlign,它应该可以工作。
希望这个回答对您有所帮助!
大家好我是 python 的初学者,所以我还不是很了解,但这是我的问题的背景。
我正在使用 reportlab 制作一份自动报告。在此我使用 PDF 图像。为了使其兼容,我使用了这个类(有一个例子)
enter code here
class PdfImage(Flowable):
def __init__(self, filename_or_object, width=None, height=None, kind='direct'):
from reportlab.lib.units import inch
# If using StringIO buffer, set pointer to begining
if hasattr(filename_or_object, 'read'):
filename_or_object.seek(0)
page = PdfReader(filename_or_object, decompress=False).pages[0]
self.xobj = pagexobj(page)
self.imageWidth = width
self.imageHeight = height
x1, y1, x2, y2 = self.xobj.BBox
self._w, self._h = x2 - x1, y2 - y1
if not self.imageWidth:
self.imageWidth = self._w
if not self.imageHeight:
self.imageHeight = self._h
self.__ratio = float(self.imageWidth)/self.imageHeight
if kind in ['direct','absolute'] or width==None or height==None:
self.drawWidth = width or self.imageWidth
self.drawHeight = height or self.imageHeight
elif kind in ['bound','proportional']:
factor = min(float(width)/self._w,float(height)/self._h)
self.drawWidth = self._w*factor
self.drawHeight = self._h*factor
def wrap(self, aW, aH):
return self.drawWidth, self.drawHeight
def drawOn(self, canv, x, y, _sW=0):
if _sW > 0 and hasattr(self, 'hAlign'):
a = self.hAlign
if a in ('CENTER', 'CENTRE', TA_CENTER):
x += 0.5*_sW
elif a in ('RIGHT', TA_RIGHT):
x += _sW
elif a not in ('LEFT', TA_LEFT):
raise ValueError("Bad hAlign value " + str(a))
xobj = self.xobj
xobj_name = makerl(canv._doc, xobj)
xscale = self.drawWidth/self._w
yscale = self.drawHeight/self._h
x -= xobj.BBox[0] * xscale
y -= xobj.BBox[1] * yscale
canv.saveState()
canv.translate(x, y)
canv.scale(xscale, yscale)
canv.doForm(xobj_name)
canv.restoreState()
Title = "Hello world"
pageinfo = "platypus example"
def myFirstPage(canvas, doc):
canvas.saveState()
canvas.setFont('Times-Bold',16)
canvas.drawCentredString(PAGE_WIDTH/2.0, PAGE_HEIGHT-108, Title)
canvas.setFont('Times-Roman',9)
canvas.drawString(inch, 0.75 * inch, "First Page / %s" % pageinfo)
canvas.restoreState()
def myLaterPages(canvas, doc):
canvas.saveState()
canvas.setFont('Times-Roman',9)
canvas.drawString(inch, 0.75 * inch, "Page %d %s" % (doc.page, pageinfo))
canvas.restoreState()
def go():
fig = plt.figure(figsize=(4, 3))
plt.plot([1,2,3,4])
plt.ylabel('some numbers')
imgdata = io.BytesIO()
fig.savefig(imgdata,format='PDF')
doc = SimpleDocTemplate("document.pdf")
Story = [Spacer(1,2*inch)]
style = styles["Normal"]
for i in range(5):
bogustext = ("This is Paragraph number %s. " % i) *20
p = Paragraph(bogustext, style)
Story.append(p)
Story.append(Spacer(1,0.2*inch))
pi = PdfImage(imgdata)
Story.append(pi)
Story.append(Spacer(1,0.2*inch))
doc.build(Story, onFirstPage=myFirstPage, onLaterPages=myLaterPages)
go()
我的问题很简单,但我无法正确解决,如何更改 hAlin 值?当您查看代码时,似乎 os possible.
谢谢大家!很简单但很烦人
我刚看到你的问题,我想你已经解决了你的问题。否则,您应该在 PdfImage class 的 init 函数中添加一个链接到 hAlign 的参数(我不知道这是否是最佳解决方案,但它适用于我),应该看起来像这样:
class PdfImage(Flowable):
def __init__(self, img_data, width=200, height=200, align='LEFT'):
self.img_width = width
self.img_height = height
self.img_data = img_data
self.hAlign = align
(原始代码的所有其他行保持不变)。 当您使用 PdfImage 时,您只需将对齐设置为 Reportlab 的 hAlign,它应该可以工作。 希望这个回答对您有所帮助!