python - Reportlab 第 x 页，共 y 个 NumberedCanvas 和图像

Question

我一直在使用http://code.activestate.com/recipes/546511/上给出的 reportlab NumberedCanvas 。但是，当我尝试构建包含 Image flowables 的 PDF 时，图像不显示，尽管留有足够的垂直空间以适应图像。有什么解决办法吗？

Answer 1

请参阅我的新改进配方，其中包括一个简单的图像测试。这是配方的摘录（省略了测试代码）：

from reportlab.pdfgen import canvas
from reportlab.lib.units import mm

class NumberedCanvas(canvas.Canvas):
    def __init__(self, *args, **kwargs):
        canvas.Canvas.__init__(self, *args, **kwargs)
        self._saved_page_states = []

    def showPage(self):
        self._saved_page_states.append(dict(self.__dict__))
        self._startPage()

    def save(self):
        """add page info to each page (page x of y)"""
        num_pages = len(self._saved_page_states)
        for state in self._saved_page_states:
            self.__dict__.update(state)
            self.draw_page_number(num_pages)
            canvas.Canvas.showPage(self)
        canvas.Canvas.save(self)

    def draw_page_number(self, page_count):
        self.setFont("Helvetica", 7)
        self.drawRightString(200*mm, 20*mm,
            "Page %d of %d" % (self._pageNumber, page_count))