ChartDirector 7.0 (Python Edition)

Polar Spline Chart




This example demonstrates polar spline line and polar spline area.

The polar spline line is created using PolarChart.addSplineLineLayer. The polar spline area is created using PolarChart.addSplineAreaLayer.

Source Code Listing

pythondemo\polarspline.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 = [5.1, 2.6, 1.5, 2.2, 5.1, 4.3, 4.0, 9.0, 1.7, 8.8, 9.9, 9.5, 9.4, 1.8, 2.1, 2.3, 3.5, 7.7, 8.8, 6.1, 5.0, 3.1, 6.0, 4.3] angles0 = [0, 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 210, 225, 240, 255, 270, 285, 300, 315, 330, 345] data1 = [8.1, 2.5, 5, 5.2, 6.5, 8.5, 9, 7.6, 8.7, 6.4, 5.5, 5.4, 3.0, 8.7, 7.1, 8.8, 7.9, 2.2, 5.0, 4.0, 1.5, 7.5, 8.3, 9.0] angles1 = [0, 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 210, 225, 240, 255, 270, 285, 300, 315, 330, 345] # Create a PolarChart object of size 460 x 460 pixels c = PolarChart(460, 460) # Add a title to the chart at the top left corner using 15pt Arial Bold Italic font c.addTitle2(TopLeft, "<*underline=2*>EM Field Strength", "Arial Bold Italic", 15) # Set center of plot area at (230, 240) with radius 180 pixels c.setPlotArea(230, 240, 180) # Set the grid style to circular grid c.setGridStyle(0) # Add a legend box at the top right corner of the chart using 9pt Arial Bold font c.addLegend(459, 0, 1, "Arial Bold", 9).setAlignment(TopRight) # Set angular axis as 0 - 360, with a spoke every 30 units c.angularAxis().setLinearScale(0, 360, 30) # Add a red (0xff9999) spline area layer to the chart using (data0, angles0) c.addSplineAreaLayer(data0, 0xff9999, "Above 100MHz").setAngles(angles0) # Add a blue (0xff) spline line layer to the chart using (data1, angle1) layer1 = c.addSplineLineLayer(data1, 0x0000ff, "Below 100MHz") layer1.setAngles(angles1) # Set the line width to 3 pixels layer1.setLineWidth(3) # Output the chart c.makeChart("polarspline.png")