This example show demonstrates the dual independent y-axis feature of ChartDirector.
In ChartDirector, any data set can be binded to the primary y-axis or the secondary y-axis, controlled by
DataSet.setUseYAxis2. The default is the primary y-axis.
The y-axes in this example are of different colors. This is achieved using
Axis.setColors.
[File: pythondemo/dualyaxis.py] (The CGI version is available as "pythondemo_cgi/dualyaxis.py".)
#!/usr/bin/python
from pychartdir import *
#The data for the chart
data0 = [0.05, 0.06, 0.48, 0.1, 0.01, 0.05]
data1 = [100, 125, 265, 147, 67, 105]
labels = ["Jan", "Feb", "Mar", "Apr", "May", "Jun"]
#Create a XYChart object of size 300 x 180 pixels
c = XYChart(300, 180)
#Set the plot area at (50, 20) and of size 200 x 130 pixels
c.setPlotArea(50, 20, 200, 130)
#Add a title to the chart using 8 pts Arial Bold font
c.addTitle("Independent Y-Axis Demo", "arialbd.ttf", 8)
#Set the x axis labels using the given labels
c.xAxis().setLabels(labels)
#Add a title to the primary (left) y axis
c.yAxis().setTitle("Packet Drop Rate (pps)")
#Set the axis, label and title colors for the primary y axis to red (0xc00000)
#to match the first data set
c.yAxis().setColors(0xc00000, 0xc00000, 0xc00000)
#Add a title to the secondary (right) y axis
c.yAxis2().setTitle("Throughtput (MBytes)")
#set the axis, label and title colors for the primary y axis to green (0x008000)
#to match the second data set
c.yAxis2().setColors(0x8000, 0x8000, 0x8000)
#Add a line layer to for the first data set using red (0xc00000) color with a
#line width to 3 pixels
c.addLineLayer(data0, 0xc00000).setLineWidth(3)
#Add a bar layer to for the second data set using green (0x00C000) color. Bind
#the second data set to the secondary (right) y axis
c.addBarLayer().addDataSet(data1, 0xc000).setUseYAxis2()
#output the chart
c.makeChart("dualyaxis.png")
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