This example demonstrates the following basic steps in creating a bar chart:
- Create a XYChart object using XYChart.XYChart.
- Specify the plot area of the chart using XYChart.setPlotArea. The plot area is the rectangle bounded by the x and y axes. You should leave some margin on the outside of the plot area for axis labels, chart titles, etc.
- Specify the labels on the x-axis using Axis.setLabels.
- Add a bar layer and specify the data for the bars using XYChart.addBarLayer.
- Generate the chart using BaseChart.makeChart2.
[File: pythondemo/simplebar.py] (The CGI version is available as "pythondemo_cgi/simplebar.py".)
#!/usr/bin/python
from pychartdir import *
#The data for the bar chart
data = [85, 156, 179.5, 211, 123]
#The labels for the bar chart
labels = ["Mon", "Tue", "Wed", "Thu", "Fri"]
#Create a XYChart object of size 250 x 250 pixels
c = XYChart(250, 250)
#Set the plotarea at (30, 20) and of size 200 x 200 pixels
c.setPlotArea(30, 20, 200, 200)
#Add a bar chart layer using the given data
c.addBarLayer(data)
#Set the x axis labels using the given labels
c.xAxis().setLabels(labels)
#output the chart
c.makeChart("simplebar.png")
|
© 2003 Advanced Software Engineering Limited. All rights reserved.