ChartDirector Ver 3.0 (Python Edition)

Stacked Area Chart




This example demonstrates using multiple data sets to create stacked area chart. The followings are key features of this example:

Source Code Listing

[File: pythondemo/stackedarea.py] (The CGI version is available as "pythondemo_cgi/stackedarea.py".)
#!/usr/bin/python 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", "-", "2", "-", "4", "-", "6", "-", "8", "-", "10", "-", "12", "-", "14", "-", "16", "-", "18", "-", "20", "-", "22", "-", "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, 0x0) #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 #8 pts Arial font with Transparent background. c.addLegend(50, 185, 0, "", 8).setBackground(Transparent) #Add a title box to the chart using 8 pts Arial Bold font, with yellow #(0xffff40) background and a black border (0x0) c.addTitle("Sales Volume", "arialbd.ttf", 8).setBackground(0xffff40, 0) #Set the y axis label format to US$nnnn c.yAxis().setLabelFormat("US${value}") #Set the x axis labels using the given labels c.xAxis().setLabels(labels) #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")