ChartDirector 7.0 (Python Edition)

Polar Area Chart




This examples demonstrates a polar area chart.

The polar area layer is created using PolarChart.addAreaLayer. In this example, 3 area layers are used. The area data are already stacked before passing to ChartDirector.

Source Code Listing

pythondemo\polararea.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 * # Data for the chart data0 = [5, 3, 10, 4, 3, 5, 2, 5] data1 = [12, 6, 17, 6, 7, 9, 4, 7] data2 = [17, 7, 22, 7, 18, 13, 5, 11] labels = ["North", "North<*br*>East", "East", "South<*br*>East", "South", "South<*br*>West", "West", "North<*br*>West"] # Create a PolarChart object of size 460 x 500 pixels, with a grey (e0e0e0) background and 1 pixel # 3D border c = PolarChart(460, 500, 0xe0e0e0, 0x000000, 1) # Add a title to the chart at the top left corner using 15pt Arial Bold Italic font. Use a wood # pattern as the title background. c.addTitle("Polar Area Chart Demo", "Arial Bold Italic", 15).setBackground(c.patternColor("wood.png" )) # Set center of plot area at (230, 280) with radius 180 pixels, and white (ffffff) background. c.setPlotArea(230, 280, 180, 0xffffff) # Set the grid style to circular grid c.setGridStyle(0) # Add a legend box at top-center of plot area (230, 35) using horizontal layout. Use 10pt Arial Bold # font, with 1 pixel 3D border effect. b = c.addLegend(230, 35, 0, "Arial Bold", 9) b.setAlignment(TopCenter) b.setBackground(Transparent, Transparent, 1) # Set angular axis using the given labels c.angularAxis().setLabels(labels) # Specify the label format for the radial axis c.radialAxis().setLabelFormat("{value}%") # Set radial axis label background to semi-transparent grey (40cccccc) c.radialAxis().setLabelStyle().setBackground(0x40cccccc, 0) # Add the data as area layers c.addAreaLayer(data2, -1, "5 m/s or above") c.addAreaLayer(data1, -1, "1 - 5 m/s") c.addAreaLayer(data0, -1, "less than 1 m/s") # Output the chart c.makeChart("polararea.png")