ChartDirector Ver 3.0 (C++ Edition)

Stacked Bar Chart




This example demonstrates creating a stacked bar chart, completed with bar labels and legend box. The key features in this example are:

For bar labels, Layer.setDataLabelStyle and Layer.setAggregateLabelStyle control the styles (fonts, colors, backgrounds, etc), while Layer.setDataLabelFormat and Layer.setAggregateLabelFormat control the formats (the contents of the label, number of decimal points in numbers, etc). You may also add custom labels to the bars using Layer.addCustomDataLabel and Layer.addCustomAggregateLabel.

Source Code Listing

[The following project is available in "cppdemo/stackedbar".]
#include "chartdir.h" int main(int argc, char *argv[]) { //The data for the bar chart double data0[] = {100, 125, 245, 147, 67}; double data1[] = {85, 156, 179, 211, 123}; double data2[] = {97, 87, 56, 267, 157}; //The labels for the bar chart const char *labels[] = {"Mon", "Tue", "Wed", "Thu", "Fri"}; //Create a XYChart object of size 500 x 320 pixels XYChart *c = new XYChart(500, 320); //Set the plotarea at (100, 40) and of size 280 x 240 pixels c->setPlotArea(100, 40, 280, 240); //Add a legend box at (400, 100) c->addLegend(400, 100); //Add a title to the chart using 14 points Times Bold Itatic font c->addTitle("Weekday Network Load", "timesbi.ttf", 14); //Add a title to the y axis. Draw the title upright (font angle = 0) c->yAxis()->setTitle("Average\nWorkload\n(MBytes\nPer Hour)")->setFontAngle( 0); //Set the labels on the x axis c->xAxis()->setLabels(StringArray(labels, sizeof(labels)/sizeof(*labels))); //Add a stacked bar layer and set the layer 3D depth to 8 pixels Layer *layer = c->addBarLayer(Stack, 8); //Add the three data sets to the bar layer layer->addDataSet(DoubleArray(data0, sizeof(data0)/sizeof(*data0)), 0xff8080, "Server # 1"); layer->addDataSet(DoubleArray(data1, sizeof(data1)/sizeof(*data1)), 0x80ff80, "Server # 2"); layer->addDataSet(DoubleArray(data2, sizeof(data2)/sizeof(*data2)), 0x8080ff, "Server # 3"); //Enable bar label for the whole bar layer->setAggregateLabelStyle(); //Enable bar label for each segment of the stacked bar layer->setDataLabelStyle(); //output the chart c->makeChart("stackedbar.png"); //free up resources delete c; return 0; }