ChartDirector Ver 3.0 (C++ Edition)

Percentage Bar Chart




A percentage bar chart is like a stacked bar chart, except the bars are individually scaled so that they stacked up to 100.

Note that in this example, the legend box contains icons. This is achieved by including the icons in the data set name using CDML.

The key features demonstrated in this example are:

Note that by default, the data label format is {percent}% (showing the percentage) for a percentage bar layer, as opposed to {value} (showing the data value) for other types of bar layer. The data label format can be modified using Layer.setDataLabelFormat.

Source Code Listing

[The following project is available in "cppdemo/percentbar".]
#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 280 pixels, using 0xffffcc as //background color, with a black border, and 1 pixel 3D border effect XYChart *c = new XYChart(500, 280, 0xffffcc, 0, 1); //Set the plotarea at (50, 45) and of size 320 x 200 pixels. Use white //(0xffffff) color as background. c->setPlotArea(50, 45, 320, 200, 0xffffff); //Add a legend box at (370, 45) using vertical layout and 8 points Arial //Bold font. LegendBox *legendBox = c->addLegend(370, 45, true, "arialbd.ttf", 8); //Set the legend box background and border to transparent legendBox->setBackground(Transparent, Transparent); //Set the legend box icon size to 16 x 32 pixels to match with custom icon //size legendBox->setKeySize(16, 32); //Add a title to the chart using 14 points Times Bold Itatic font and white //font color, and 0x804020 as the background color c->addTitle("Weekly Product Sales", "timesbi.ttf", 14, 0xffffff )->setBackground(0x804020); //Set the labels on the x axis c->xAxis()->setLabels(StringArray(labels, sizeof(labels)/sizeof(*labels))); //Add a percentage bar layer and set the layer 3D depth to 8 pixels Layer *layer = c->addBarLayer(Percentage); //Add the three data sets to the bar layer, using icons images with labels //as data set names layer->addDataSet(DoubleArray(data0, sizeof(data0)/sizeof(*data0)), 0xddaa77, "<*block,valign=absmiddle*><*img=service.png*> Service<*/*>"); layer->addDataSet(DoubleArray(data1, sizeof(data1)/sizeof(*data1)), 0xaadd77, "<*block,valign=absmiddle*><*img=software.png*> Software<*/*>" ); layer->addDataSet(DoubleArray(data2, sizeof(data2)/sizeof(*data2)), 0xaa77dd, "<*block,valign=absmiddle*><*img=computer.png*> Hardware<*/*>" ); //Disable bar borders by setting their colors to transparent layer->setBorderColor(Transparent); //Enable data label at the middle of the the bar layer->setDataLabelStyle()->setAlignment(Center); //For a vertical stacked chart with positive data only, the last data set is //always on top. However, in a vertical legend box, the last data set is at //the bottom. This can be reversed by using the setLegend method. layer->setLegend(ReverseLegend); //output the chart c->makeChart("percentbar.png"); //free up resources delete c; return 0; }