ChartDirector Ver 3.0 (C++ Edition)

Stacked Area Chart




This example demonstrates using multiple data sets to create stacked area chart. The followings are key features of this example:

Source Code Listing

[The following project is available in "cppdemo/stackedarea".]
#include "chartdir.h" int main(int argc, char *argv[]) { //The data for the area chart double data0[] = {42, 49, 33, 38, 51, 46, 29, 41, 44, 57, 59, 52, 37, 34, 51, 56, 56, 60, 70, 76, 63, 67, 75, 64, 51}; double data1[] = {50, 45, 47, 34, 42, 49, 63, 62, 73, 59, 56, 50, 64, 60, 67, 67, 58, 59, 73, 77, 84, 82, 80, 84, 89}; double data2[] = {61, 79, 85, 66, 53, 39, 24, 21, 37, 56, 37, 22, 21, 33, 13, 17, 4, 23, 16, 25, 9, 10, 5, 7, 16}; const char *labels[] = {"0", "-", "2", "-", "4", "-", "6", "-", "8", "-", "10", "-", "12", "-", "14", "-", "16", "-", "18", "-", "20", "-", "22", "-", "24"}; //Create a XYChart object of size 300 x 210 pixels. Set the background to //pale yellow (0xffffc0) with a black border (0x0) XYChart *c = new XYChart(300, 210, 0xffffc0, 0x0); //Set the plotarea at (50, 30) and of size 240 x 140 pixels. Use white //(0xffffff) background. c->setPlotArea(50, 30, 240, 140)->setBackground(0xffffff); //Add a legend box at (50, 185) (below of plot area) using horizontal //layout. Use 8 pts Arial font with Transparent background. c->addLegend(50, 185, false, "", 8)->setBackground(Transparent); //Add a title box to the chart using 8 pts Arial Bold font, with yellow //(0xffff40) background and a black border (0x0) c->addTitle("Sales Volume", "arialbd.ttf", 8)->setBackground(0xffff40, 0); //Set the y axis label format to US$nnnn c->yAxis()->setLabelFormat("US${value}"); //Set the x axis labels using the given labels c->xAxis()->setLabels(StringArray(labels, sizeof(labels)/sizeof(*labels))); //Add an stack area layer with three data sets AreaLayer *layer = c->addAreaLayer(Stack); layer->addDataSet(DoubleArray(data0, sizeof(data0)/sizeof(*data0)), 0x4040ff, "Store #1"); layer->addDataSet(DoubleArray(data1, sizeof(data1)/sizeof(*data1)), 0xff4040, "Store #2"); layer->addDataSet(DoubleArray(data2, sizeof(data2)/sizeof(*data2)), 0x40ff40, "Store #3"); //output the chart c->makeChart("stackedarea.png"); //free up resources delete c; return 0; }