Adding date labels to a reportlab LinePlot chart
import reportlab
from advisor.charting.Font import Font

from reportlab.lib.colors import Color, HexColor
from reportlab.lib.pagesizes import cm, inch
from reportlab.graphics.charts.legends import Legend
from reportlab.graphics.charts.textlabels import Label
from reportlab.graphics.charts.linecharts import HorizontalLineChart
from reportlab.graphics.charts.lineplots import LinePlot
from reportlab.graphics.shapes import Drawing, String, _DrawingEditorMixin
from reportlab.graphics.widgets.markers import makeMarker


class TacticalAugLineGraph(_DrawingEditorMixin, Drawing):
    def __init__(self, width=100, height=110, legend=False, *args, **kw):
        apply(Drawing.__init__, (self, width, height) + args, kw)

        chartFont = Font('Gotham-Bold')

        self._add(self, LinePlot(), name='chart', validate=None, desc=None)
        self.chart._inFill = 1
        self.chart.x                = 20
        self.chart.y                = 15
        self.chart.width        = 85
        self.chart.height   = 95

        #self.chart.lineLabelFormat = '%d%%'
        self.chart.yValueAxis.valueMin = 0
        self.chart.yValueAxis.valueMax = 100
        self.chart.yValueAxis.valueStep = 10

    def apply_colors(self, colors):

        self.chart.lines[0].strokeColor = colors[0]
        self.chart.lines[1].strokeColor = colors[1]
        self.chart.lines[2].strokeColor = colors[2]
        self.chart.lines[3].strokeColor = colors[3]

#!/usr/bin/python
from reportlab.graphics.charts.lineplots import LinePlot
from reportlab.graphics.shapes import Drawing
from reportlab.lib import colors
from random import randint
from datetime import date, timedelta

# Generate some testdata
data = [
    [(x,randint(90,100)) for x in range(0,2001,100)],
    [(x,randint(30,80)) for x in range(0,2001,100)],
    [(x,randint(5,20)) for x in range(0,2001,100)],
    ]

# Create the drawing and the lineplot
drawing = Drawing(400, 200)
lp = LinePlot()
lp.x = 50
lp.y = 50
lp.height = 125
lp.width = 300
lp._inFill = 1
lp.data = data
for i in range(len(data)):
    lp.lines[i].strokeColor = colors.toColor('hsl(%s,80%%,40%%)'%(i*60))

# Specify where the labels should be
lp.xValueAxis.valueSteps = [5, 500, 1402, 1988]
# Create a formatter that takes the value and format it however you like.
def formatter(val):
    #return val
    #return 'x=%s'%val
    return (date(2010,1,1) + timedelta(val)).strftime('%Y-%m-%d')

# Use the formatter
lp.xValueAxis.labelTextFormat = formatter
drawing.add(lp)

from reportlab.graphics import renderPDF
renderPDF.drawToFile(drawing, 'example.pdf', 'lineplot with dates')