listing21-2.py

《Beginning Python--From Novice to Professional》 的源码

from reportlab.lib import colors
from reportlab.graphics.shapes import *
from reportlab.graphics import renderPDF

data = [
#    Year  Month  Predicted  High  Low
    (2007,  8,    113.2,     114.2, 112.2),
    (2007,  9,    112.8,     115.8, 109.8),
    (2007, 10,    111.0,     116.0, 106.0),
    (2007, 11,    109.8,     116.8, 102.8),
    (2007, 12,    107.3,     115.3,  99.3),
    (2008,  1,    105.2,     114.2,  96.2),
    (2008,  2,    104.1,     114.1,  94.1),
    (2008,  3,     99.9,     110.9,  88.9),
    (2008,  4,     94.8,     106.8,  82.8),
    (2008,  5,     91.2,     104.2,  78.2),
    ]

drawing = Drawing(200, 150)

pred = [row[2]-40 for row in data]
high = [row[3]-40 for row in data]
low = [row[4]-40 for row in data]
times = [200*((row[0] + row[1]/12.0) - 2007)-110 for row in data]

drawing.add(PolyLine(zip(times, pred), strokeColor=colors.blue))
drawing.add(PolyLine(zip(times, high), strokeColor=colors.red))
drawing.add(PolyLine(zip(times, low),  strokeColor=colors.green))

drawing.add(String(65, 115, 'Sunspots', fontSize=18, fillColor=colors.red))

renderPDF.drawToFile(drawing, 'report1.pdf', 'Sunspots')