ChartDirector 7.0 (Python Edition)

Stacked Rose Chart




This example demonstrates how to create a stacked rose chart.

This example employs the same approach as the previous Simple Rose Chart example. It creates a PolarChart object as the graph paper, and adding sector zones on it using AngularAxis.addZone. A transparent line layer is used for enabling auto-scaling.

In this example, multiple sectors are added for each angular direction, creating a "stacked" effect.

Source Code Listing

pythondemo\stackrose.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] angles = [0, 45, 90, 135, 180, 225, 270, 315] labels = ["North", "North\nEast", "East", "South\nEast", "South", "South\nWest", "West", "North\nWest"] # Create a PolarChart object of size 460 x 500 pixels, with a grey (e0e0e0) background and a 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 white text # on deep blue background. c.addTitle("Wind Direction", "Arial Bold Italic", 15, 0xffffff).setBackground(0x000080) legendBox = c.addLegend(230, 35, 0, "Arial Bold", 9) legendBox.setAlignment(TopCenter) legendBox.setBackground(Transparent, Transparent, 1) legendBox.addKey("5 m/s or above", 0xff3333) legendBox.addKey("1 - 5 m/s", 0x33ff33) legendBox.addKey("less than 1 m/s", 0x3333ff) # Set plot area center at (230, 280) with radius 180 pixels and white background c.setPlotArea(230, 280, 180, 0xffffff) # Set the grid style to circular grid c.setGridStyle(0) # Set angular axis as 0 - 360, with a spoke every 30 units c.angularAxis().setLinearScale2(0, 360, labels) for i in range(0, len(angles)) : c.angularAxis().addZone(angles[i] - 10, angles[i] + 10, 0, data0[i], 0x3333ff, 0) c.angularAxis().addZone(angles[i] - 10, angles[i] + 10, data0[i], data1[i], 0x33ff33, 0) c.angularAxis().addZone(angles[i] - 10, angles[i] + 10, data1[i], data2[i], 0xff3333, 0) # Add an Transparent invisible layer to ensure the axis is auto-scaled using the data c.addLineLayer(data2, Transparent) # Output the chart c.makeChart("stackrose.png")