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)
EDIT
Pie Chart
I'm referring this link for generation of Pie Chart. In this the colors are pre-defined for each data, ie 10 colors for 10 data points. What if I have 11 data points and then there will be no color for that 11th data point. I want something dynamic which should automatically pick a color by itself and plot it on the pie.
I found this link and this link, but the colors over here are not catchy and not at all good.
Can you please brief me about how to get catchy colors in pie graph?
Thanks