I was able to build a custom Logarithmic Axis that includes labels for all the ticks
Result:
Configure Chart extension function script:
#def configureChart(self, chart):
from java.lang import Math
from java.util import ArrayList
from org.jfree.chart.axis import LogarithmicAxis, NumberTick
from org.jfree.ui import TextAnchor
class LabelAllLogTicksAxis(LogarithmicAxis):
def refreshTicksVertical(self, g2, dataArea, edge):
lowerBound = self.range.lowerBound
upperBound = self.range.upperBound
ticks = ArrayList()
# lowerGuard variable added by rpavlicek to cover cases where the lower bound is less than or equal to zero
lowerGuard = lowerBound if lowerBound > 0 else 1e-10
startingDecade = int(Math.floor(Math.log10(lowerGuard)))
endingDecade = int(Math.ceil(Math.log10(upperBound)))
for decade in xrange(startingDecade, endingDecade):
base = 10.0 ** decade
for multiplier in xrange(1, 10):
value = multiplier * base
# Added to remove a negative label that was appearing below the lower bound
if value < lowerBound or value > upperBound:
continue
# https://www.jfree.org/jfreechart/api/javadoc/org/jfree/chart/axis/NumberTick.html
# NumberTick(Number number, String label, TextAnchor textAnchor, TextAnchor rotationAnchor, double angle)
ticks.add(NumberTick(value, unicode(value), TextAnchor.CENTER_RIGHT, TextAnchor.CENTER_RIGHT, 0.0))
return ticks
plot = chart.plot
oldLogAxis = plot.rangeAxis
newLogAxis = LabelAllLogTicksAxis(oldLogAxis.label)
newLogAxis.range = oldLogAxis.range
plot.rangeAxis = newLogAxis
Edit: Added lower guard variable developed by @rpavlicek that covers cases where the lower bound of the chart is less than or equal to zero