ChartDirector 7.0 (Python Edition)

Stacked Area Chart




This example demonstrates using multiple data sets to create stacked area chart.

The key features demonstrated in this example are:

Source Code Listing

pythondemo\stackedarea.py
#!/usr/bin/python # The ChartDirector for Python module is assumed to be in "../lib" import sys, os sys.path.insert(0, os.path.join(os.path.abspath(sys.path[0]), "..", "lib")) from pychartdir import * # The data for the area chart data0 = [42, 49, 33, 38, 51, 46, 29, 41, 44, 57, 59, 52, 37, 34, 51, 56, 56, 60, 70, 76, 63, 67, 75, 64, 51] data1 = [50, 45, 47, 34, 42, 49, 63, 62, 73, 59, 56, 50, 64, 60, 67, 67, 58, 59, 73, 77, 84, 82, 80, 84, 89] data2 = [61, 79, 85, 66, 53, 39, 24, 21, 37, 56, 37, 22, 21, 33, 13, 17, 4, 23, 16, 25, 9, 10, 5, 7, 16] labels = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24"] # Create a XYChart object of size 300 x 210 pixels. Set the background to pale yellow (0xffffc0) # with a black border (0x0) c = XYChart(300, 210, 0xffffc0, 0x000000) # Set the plotarea at (50, 30) and of size 240 x 140 pixels. Use white (0xffffff) background. c.setPlotArea(50, 30, 240, 140).setBackground(0xffffff) # Add a legend box at (50, 185) (below of plot area) using horizontal layout. Use 8pt Arial font # with Transparent background. c.addLegend(50, 185, 0, "", 8).setBackground(Transparent) # Add a title box to the chart using 8pt Arial Bold font, with yellow (0xffff40) background and a # black border (0x0) c.addTitle("Sales Volume", "Arial Bold", 8).setBackground(0xffff40, 0) # Set the y axis label format to US$nnnn c.yAxis().setLabelFormat("US${value}") # Set the labels on the x axis. c.xAxis().setLabels(labels) # Display 1 out of 2 labels on the x-axis. Show minor ticks for remaining labels. c.xAxis().setLabelStep(2, 1) # Add an stack area layer with three data sets layer = c.addAreaLayer2(Stack) layer.addDataSet(data0, 0x4040ff, "Store #1") layer.addDataSet(data1, 0xff4040, "Store #2") layer.addDataSet(data2, 0x40ff40, "Store #3") # Output the chart c.makeChart("stackedarea.png")