ChartDirector 7.1 (C++ Edition)

Polar Line Chart




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

Source Code Listing

The following is the command line version of the code in "cppdemo/polarline". 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 chart double data0[] = {90, 25, 40, 55, 68, 44, 79, 85, 50}; const int data0_size = (int)(sizeof(data0)/sizeof(*data0)); double angles0[] = {15, 60, 110, 180, 230, 260, 260, 310, 340}; const int angles0_size = (int)(sizeof(angles0)/sizeof(*angles0)); double data1[] = {80, 91, 66, 80, 92, 87}; const int data1_size = (int)(sizeof(data1)/sizeof(*data1)); double angles1[] = {40, 65, 88, 110, 150, 200}; const int angles1_size = (int)(sizeof(angles1)/sizeof(*angles1)); // Create a PolarChart object of size 460 x 500 pixels, with a grey (e0e0e0) background and 1 // pixel 3D border PolarChart* c = new 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(false, false); // 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. LegendBox* b = c->addLegend(230, 35, false, "Arial Bold", 9); b->setAlignment(Chart::TopCenter); b->setBackground(Chart::Transparent, Chart::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) PolarLineLayer* layer0 = c->addLineLayer(DoubleArray(data0, data0_size), 0x0000ff, "Close Loop Line"); layer0->setAngles(DoubleArray(angles0, angles0_size)); // Set the line width to 2 pixels layer0->setLineWidth(2); // Use 11 pixel triangle symbols for the data points layer0->setDataSymbol(Chart::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, Chart::Transparent, 1); // Add a red (0xff0000) line layer to the chart using (data1, angle1) PolarLineLayer* layer1 = c->addLineLayer(DoubleArray(data1, data1_size), 0xff0000, "Open Loop Line"); layer1->setAngles(DoubleArray(angles1, angles1_size)); // Set the line width to 2 pixels layer1->setLineWidth(2); // Use 11 pixel diamond symbols for the data points layer1->setDataSymbol(Chart::DiamondSymbol, 11); // Set the line to open loop layer1->setCloseLoop(false); // 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, Chart::Transparent, 1); // Output the chart c->makeChart("polarline.png"); //free up resources delete c; return 0; }