ChartDirector 7.1 (C++ Edition)

Pie Chart with Legend (1)




This example demonstrates how to add a legend box to a pie chart. It also demonstrates alternative sector label format and rounded edge sector shading.

Source Code Listing

The following is the command line version of the code in "cppdemo/legendpie". The MFC version of the code is in "mfcdemo/mfcdemo". The Qt Widgets version of the code is in "qtdemo/qtdemo". The QML/Qt Quick version of the code is in "qmldemo/qmldemo".
#include "chartdir.h" int main(int argc, char *argv[]) { // The data for the pie chart double data[] = {25, 18, 15, 12, 8, 30, 35}; const int data_size = (int)(sizeof(data)/sizeof(*data)); // The labels for the pie chart const char* labels[] = {"Labor", "Licenses", "Taxes", "Legal", "Insurance", "Facilities", "Production"}; const int labels_size = (int)(sizeof(labels)/sizeof(*labels)); // Create a PieChart object of size 450 x 270 pixels PieChart* c = new PieChart(450, 270); // Set the center of the pie at (150, 100) and the radius to 80 pixels c->setPieSize(150, 135, 100); // add a legend box where the top left corner is at (330, 50) c->addLegend(330, 60); // modify the sector label format to show percentages only c->setLabelFormat("{percent}%"); // Set the pie data and the pie labels c->setData(DoubleArray(data, data_size), StringArray(labels, labels_size)); // Use rounded edge shading, with a 1 pixel white (FFFFFF) border c->setSectorStyle(Chart::RoundedEdgeShading, 0xffffff, 1); // Output the chart c->makeChart("legendpie.png"); //free up resources delete c; return 0; }