
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.
ChartDirector Ver 4.1 (C++ Edition)
Polar Spline Chart
Source Code Listing
#include "chartdir.h" int main(int argc, char *argv[]) { // The data for the chart double 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}; double 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}; double 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}; double 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 PolarChart *c = new PolarChart(460, 460); // Add a title to the chart at the top left corner using 15pts Arial Bold Italic // font c->addTitle(Chart::TopLeft, "<*underline=2*>EM Field Strength", "arialbi.ttf", 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(false); // Add a legend box at the top right corner of the chart using 9 pts Arial Bold // font c->addLegend(459, 0, true, "arialbd.ttf", 9)->setAlignment(Chart::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(DoubleArray(data0, sizeof(data0)/sizeof(data0[0])), 0xff9999, "Above 100MHz")->setAngles(DoubleArray(angles0, sizeof(angles0)/sizeof(angles0[0]))); // Add a blue (0xff) spline line layer to the chart using (data1, angle1) PolarSplineLineLayer *layer1 = c->addSplineLineLayer(DoubleArray(data1, sizeof(data1)/sizeof(data1[0])), 0x0000ff, "Below 100MHz"); layer1->setAngles(DoubleArray(angles1, sizeof(angles1)/sizeof(angles1[0]))); // Set the line width to 3 pixels layer1->setLineWidth(3); // output the chart c->makeChart("polarspline.png"); //free up resources delete c; return 0; } |