ChartDirector Ver 4.1 (C++ Edition)

Donut Chart




This example demonstrates a donut chart. It also demonstrates other chart effects, such as using CDML to nicely format sector labels, silver background color, rounded corners, and glass shading effect for title and sector labels.

Source Code Listing

[The following code is available in "cppdemo/donut". A MFC version of the code is available in "mfcdemo" (Windows edition only).]
#include "chartdir.h"

int main(int argc, char *argv[])
{
    // The data for the pie chart
    double data[] = {20, 10, 15, 12};

    // The labels for the pie chart
    const char *labels[] = {"Labor", "Licenses", "Facilities", "Production"};

    // Create a PieChart object of size 560 x 280 pixels, with a silver background,
    // black border, 1 pxiel 3D border effect and rounded corners
    PieChart *c = new PieChart(560, 280, Chart::silverColor(), 0x000000, 1);
    c->setRoundedFrame();

    // Add a title box using 15 pts Times Bold Italic font in white color, on a deep
    // blue (0000CC) background with reduced-glare glass effect
    c->addTitle("Donut Chart Demonstration", "timesbi.ttf", 15, 0xffffff
        )->setBackground(0x0000cc, 0x000000, Chart::glassEffect(Chart::ReducedGlare))
        ;

    // Set donut center at (280, 140), and outer/inner radii as 110/55 pixels
    c->setDonutSize(280, 140, 110, 55);

    // Set 3D effect with 3D depth of 20 pixels
    c->set3D(20);

    // Set the label box background color the same as the sector color, with
    // reduced-glare glass effect and rounded corners
    TextBox *t = c->setLabelStyle();
    t->setBackground(Chart::SameAsMainColor, Chart::Transparent, Chart::glassEffect(
        Chart::ReducedGlare));
    t->setRoundedCorners();

    // Set the sector label format. The label consists of two lines. The first line
    // is the sector name in Times Bold Italic font and is underlined. The second
    // line shows the data value and percentage.
    c->setLabelFormat(
        "<*block,halign=left*><*font=timesbi.ttf,size=12,underline=1*>{label}"
        "<*/font*><*br*>US$ {value}K ({percent}%)");

    // Set the pie data and the pie labels
    c->setData(DoubleArray(data, sizeof(data)/sizeof(data[0])), StringArray(labels,
        sizeof(labels)/sizeof(labels[0])));

    // Use the side label layout method
    c->setLabelLayout(Chart::SideLayout);

    // output the chart
    c->makeChart("donut.png");

    //free up resources
    delete c;
    return 0;
}