Question

我正在使用Django和Reportlabs以PDF格式生成报告。我指的是this tutorial。

我还阅读了this thread以及this thread，其中说使用了canv.showpage()，然后我就可以将1个图表合并为1个pdf，但我仍然只得到那个图表在代码中排在第二位，在我的例子中只有折线图。

如何以1 pdf格式保存2张图表？

这是我的代码。

import barchart
import linechart
from django.http import HttpResponse
from reportlab.graphics.shapes import Drawing
from reportlab.graphics.charts.barcharts import VerticalBarChart
from reportlab.graphics import renderPDF    
from reportlab.pdfgen import canvas


def generate_report(request):


    #instantiate a drawing object
    canv = canvas.Canvas('output.pdf')#,pagesize=LETTER) 
    canv.setPageCompression(0)  
    d = barchart.MyBarChartDrawing()

    #extract the request params of interest.
    #I suggest having a default for everything.
    if 'height' in request:
        d.height = int(request['height'])
    if 'width' in request:
        d.width = int(request['width'])

    if 'numbers' in request:
        strNumbers = request['numbers']
        numbers = map(int, strNumbers.split(','))    
        d.chart.data = [numbers]   #bar charts take a list-of-lists for data

    if 'title' in request:
        d.title.text = request['title']


    #get a GIF (or PNG, JPG, or whatever)
    binaryStuff = d.asString('pdf')

    #binaryStuff.save()
    #return HttpResponse(binaryStuff, 'image/pdf')
    #instantiate a drawing object
    canv.showPage()
    a = linechart.MyLineChartDrawing()

    #extract the request params of interest.
    #I suggest having a default for everything.


    a.height = 300
    a.chart.height = 300


    a.width = 300
    a.chart.width = 300

    a.title._text = request.session.get('Some custom title')



    a.XLabel._text = request.session.get('X Axis Labell')
    a.YLabel._text = request.session.get('Y Axis Label')

    a.chart.data = [((1,1), (2,2), (2.5,1), (3,3), (4,5)),((1,2), (2,3), (2.5,2), (3.5,5), (4,6))]



    labels =  ["Label One","Label Two"]
    if labels:
        # set colors in the legend
        a.Legend.colorNamePairs = []
        for cnt,label in enumerate(labels):
            a.Legend.colorNamePairs.append((a.chart.lines[cnt].strokeColor,label))


    #get a GIF (or PNG, JPG, or whatever)
    binaryStuff1 = a.asString('pdf')
    canv.showPage()
    return HttpResponse(binaryStuff, 'pdf')

条形图和折线图代码与this site相同。

我如何只保存在一个pdf文件中？

Answer 1

根据提供的代码，您只获得折线图，因为您只是将BinaryStuff传递给响应（查看代码的最后3行）。

尝试将图形创建为图像，将图像绘制到画布上，然后将画布作为PDF返回。

使用ReportLab将两个图表组合成单个PDF？

1 个答案: