ChartDirector 7.0 (Python Edition)

Polar Line Chart




This example demonstrates a polar line chart, completed with data symbols and data labels.

Source Code Listing

pythondemo\polarline.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 chart data0 = [90, 25, 40, 55, 68, 44, 79, 85, 50] angles0 = [15, 60, 110, 180, 230, 260, 260, 310, 340] data1 = [80, 91, 66, 80, 92, 87] angles1 = [40, 65, 88, 110, 150, 200] # 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 Line 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, with grids below the chart layers c.setGridStyle(0, 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 as 0 - 360, with a spoke every 30 units c.angularAxis().setLinearScale(0, 360, 30) # Add a blue (0xff) line layer to the chart using (data0, angle0) layer0 = c.addLineLayer(data0, 0x0000ff, "Close Loop Line") layer0.setAngles(angles0) # Set the line width to 2 pixels layer0.setLineWidth(2) # Use 11 pixel triangle symbols for the data points layer0.setDataSymbol(TriangleSymbol, 11) # Enable data label and set its format layer0.setDataLabelFormat("({value},{angle})") # Set the data label text box with light blue (0x9999ff) backgruond color and 1 pixel 3D border # effect layer0.setDataLabelStyle().setBackground(0x9999ff, Transparent, 1) # Add a red (0xff0000) line layer to the chart using (data1, angle1) layer1 = c.addLineLayer(data1, 0xff0000, "Open Loop Line") layer1.setAngles(angles1) # Set the line width to 2 pixels layer1.setLineWidth(2) # Use 11 pixel diamond symbols for the data points layer1.setDataSymbol(DiamondSymbol, 11) # Set the line to open loop layer1.setCloseLoop(0) # Enable data label and set its format layer1.setDataLabelFormat("({value},{angle})") # Set the data label text box with light red (0xff9999) backgruond color and 1 pixel 3D border # effect layer1.setDataLabelStyle().setBackground(0xff9999, Transparent, 1) # Output the chart c.makeChart("polarline.png")