4

I'm plotting disk partitioning and available space.

I have a pie chart showing the partitioning: e.g. 30% /, 70% /home.

In the second ring I want to show that 90% / is full, 10% of / is empty. 10% /home is full, 90% /home is empty.

How can I generate the 'second' series of the wedges?

Please give example in LibreOffice, gnuplot, matplotlib, etc.

Something like this:

enter image description here

2
3

Assume your data is in the format:

data = {
    # partition: (frac of disk, frac full)
    "/": (0.3, 0.9),
    "/home": (0.7, 0.1),
}

Try using the reportlab.graphics library (available from the Ubuntu and Fedora repositories as python-reportlab):

from reportlab.graphics.shapes import Drawing
from reportlab.graphics.charts.piecharts import Pie
from reportlab.graphics import renderSVG
from itertools import chain
d = Drawing(400, 400)

outerPie = Pie()
outerPie.x = outerPie.y = 0
outerPie.width = outerPie.height = 400
# 2 slices for each sector (used, unused)
outerPie.data = list(chain(*[
    [fracDisk * fracPart, fracDisk * (1 - fracPart)]
    for (fracDisk, fracPart) in data.values()]))
d.add(outerPie, '')

# Draw smaller pie chart on top of outerPie, leaving outerPie as a ring
innerPie = Pie()
innerPie.x = innerPie.y = 100
innerPie.width = innerPie.height = 200
innerPie.data = [t[0] for t in data.values()]
innerPie.labels = list(data)
d.add(innerPie, '')

renderSVG.drawToFile(d, 'chart.svg')

Sample output:

Sample output of chart

2
+50

It can also be done quite simply in Mathematica (tested on the Linux version):

data = {{"/", 0.3, 0.9}, {"/home", 0.7, 0.1}};
PieChart[{
  Labeled[#[[2]], #[[1]]] & /@ data,
  Flatten[{Labeled[#[[2]] *    #[[3]] , "used"], 
           Labeled[#[[2]] * (1-#[[3]]), "free"]} & /@ data]
}, SectorSpacing -> 0]

Or if you want the colors to match:

data = {{"/", 0.3, 0.9, Red}, {"/home", 0.7, 0.1, Blue}};
PieChart[{
  Style[Labeled[#[[2]], #[[1]]], #[[4]]] & /@ data,
  Flatten[{Style[Labeled[#[[2]] *    #[[3]] , "used"], #[[4]]], 
           Style[Labeled[#[[2]] * (1-#[[3]]), "free"], Lighter@#[[4]]]} & /@ data]
}, SectorSpacing -> 0]

Pie chart

2
  • awesome! now same using opensource tools? =) – Dima Aug 1 '12 at 15:57
  • @Dima: reportlab.graphics is open-source. – Mechanical snail Aug 1 '12 at 15:58

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.