pdf - Python- Reportlabs - save 2 different graphs in 2 different pages?

Question

I've the following code where I'm drawing a vertical bar graph and a line graph as well inside a PDF.

How do I save these 2 graphs in 2 different pages of the PDF. I saw that it can be done using -

c = canvas.Canvas("hello.pdf")
hello(c)
c.showPage()
c.save()

But, instead of using Canvas, I'm using Drawing object in which showPage() method does not exist.

How do I save the 2 graphs in 2 different pages of the PDF? Right the second graph(line chart) overlaps the first graph (vertical bar chart), thereby hindering the bar chart.

Here is my code.

from reportlab.graphics.shapes import Drawing
from reportlab.graphics.charts.barcharts import VerticalBarChart

drawing = Drawing(400, 200)
data = [
(13, 5, 20, 22, 37, 45, 19, 4),
(14, 6, 21, 23, 38, 46, 20, 5)
]
bc = VerticalBarChart()
bc.x = 50
bc.y = 50
bc.height = 125
bc.width = 300
bc.data = data
#bc.strokeColor = colors.black
bc.valueAxis.valueMin = 0
bc.valueAxis.valueMax = 50
bc.valueAxis.valueStep = 10
bc.categoryAxis.labels.boxAnchor = 'ne'
bc.categoryAxis.labels.dx = 8
bc.categoryAxis.labels.dy = -2
bc.categoryAxis.labels.angle = 30
bc.categoryAxis.categoryNames = ['Jan-99','Feb-99','Mar-99',
'Apr-99','May-99','Jun-99','Jul-99','Aug-99']

drawing.add(bc)
drawing.save()

from reportlab.graphics.charts.lineplots import LinePlot
from reportlab.graphics.widgets.markers import makeMarker

drawing = Drawing(400, 200)
data = [
((1,1), (2,2), (2.5,1), (3,3), (4,5)),
((1,2), (2,3), (2.5,2), (3.5,5), (4,6))
]
lp = LinePlot()
lp.x = 50
lp.y = 50
lp.height = 125
lp.width = 300
lp.data = data
lp.joinedLines = 1
lp.lines[0].symbol = makeMarker('FilledCircle')
lp.lines[1].symbol = makeMarker('Circle')
lp.lineLabelFormat = '%2.0f'
#lp.strokeColor = colors.black
lp.xValueAxis.valueMin = 0
lp.xValueAxis.valueMax = 5
lp.xValueAxis.valueSteps = [1, 2, 2.5, 3, 4, 5]
lp.xValueAxis.labelTextFormat = '%2.1f'
lp.yValueAxis.valueMin = 0
lp.yValueAxis.valueMax = 7
lp.yValueAxis.valueSteps = [1, 2, 3, 5, 6]
drawing.add(lp)
drawing.save()
drawing.save(formats=['pdf'],outDir='.',fnRoot=None) 

Answer 1

Make a canvas and render your drawings on it:

from reportlab.pdfgen import canvas
from reportlab.graphics import renderPDF

c = canvas.Canvas('hi.pdf')

# your drawing
# drawing = Drawing(400, 200)

x, y = 0, 0 # coordinates (from left bottom)
renderPDF.draw(drawing, c, x, y, showBoundary=False)

c.showPage() # to end a page and start a new one

# extra pages content

c.save() # to save :D the whole document

Hope it helps :)