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import math
from pyjamas.chart.GChart import GChart
from pyjamas.chart.HovertextChunk import formatAsHovertext
# GWT 1.4's Math class does not include JDK's
# Math.log10--so emulate it.
def log10(x):
return math.log(x)/math.log(10.0)
"""*
* Defines a traditional "semi-log" chart by using custom
* ticks on the y axis, in conjunction with log-transformed
* y data.
"""
class GChartExample04(GChart):
def __init__(self):
GChart.__init__(self, XChartSize=300, YChartSize=450)
self.setChartTitle("<h2>2<sup>x</sup> vs x</h2>")
self.addCurve()
self.getCurve().getSymbol().setHovertextTemplate(
formatAsHovertext("${y}=2^${x}"))
self.getCurve().setLegendLabel("<b>2<sup>x</sup></b>")
self.getCurve().getSymbol().setBackgroundColor("red")
self.getCurve().getSymbol().setBorderColor("black")
self.getCurve().getSymbol().setWidth(9)
self.getCurve().getSymbol().setHeight(9)
# add (log10-transformed) powers of 2 from 1/4 to 8
for i in range(-2, 4):
self.getCurve().addPoint(i,log10(math.pow(2,i)))
# GChart's "=10^" NumberFormat prefix inverts the log10
# transform
self.getYAxis().setTickLabelFormat("=10^#.##")
# add conventional log-scaled ticks from .1 to 10
self.getYAxis().addTick(log10(0.1))
x = 0.1
while x < 10:
for y in range(2, 11):
self.getYAxis().addTick(log10(x*y))
x *= 10
self.getXAxis().setAxisLabel("<b>x</b>")
self.getXAxis().setHasGridlines(True)
self.getXAxis().setTickCount(6)
self.getYAxis().setAxisLabel("<b>2<sup>x</sup></b>")
self.getYAxis().setHasGridlines(True)
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