

This example demonstrates using a log scale axis versus a linear scale axis.
In ChartDirector, log scale axis can be configured using Axis.setLogScale, Axis.setLogScale2 or Axis.setLogScale3.
ChartDirector 6.0 (Python Edition)
Log Scale Axis
Source Code Listing
#!/usr/bin/python from pychartdir import * def createChart(chartIndex) : # The data for the chart data = [100, 125, 260, 147, 67] labels = ["Mon", "Tue", "Wed", "Thu", "Fri"] # Create a XYChart object of size 200 x 180 pixels c = XYChart(200, 180) # Set the plot area at (30, 10) and of size 140 x 130 pixels c.setPlotArea(30, 10, 140, 130) # Ise log scale axis if required if chartIndex == 1 : c.yAxis().setLogScale3() # Set the labels on the x axis c.xAxis().setLabels(labels) # Add a color bar layer using the given data. Use a 1 pixel 3D border for the bars. c.addBarLayer3(data).setBorderColor(-1, 1) # Output the chart c.makeChart("logaxis%s.png" % chartIndex) createChart(0) createChart(1) |
#!/usr/bin/python from pychartdir import * import cgi, sys # Get HTTP query parameters query = cgi.FieldStorage() # This script can draw different charts depending on the chartIndex chartIndex = int(query["img"].value) # The data for the chart data = [100, 125, 260, 147, 67] labels = ["Mon", "Tue", "Wed", "Thu", "Fri"] # Create a XYChart object of size 200 x 180 pixels c = XYChart(200, 180) # Set the plot area at (30, 10) and of size 140 x 130 pixels c.setPlotArea(30, 10, 140, 130) # Ise log scale axis if required if chartIndex == 1 : c.yAxis().setLogScale3() # Set the labels on the x axis c.xAxis().setLabels(labels) # Add a color bar layer using the given data. Use a 1 pixel 3D border for the bars. c.addBarLayer3(data).setBorderColor(-1, 1) # Output the chart print("Content-type: image/png\n") binaryPrint(c.makeChart2(PNG)) |