ChartDirector 6.0 (C++ Edition)

Exploded Pie Chart




This example demonstrates a pie chart with all sectors exploded. It also demonstrates many effects, such as gradient color background, rounded frame, soft drop shadow, custom sector colors, sector gradient shading, thick sector border, and using CDML and Parameter Substitution and Formatting to format sector labels.

Source Code Listing

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

int main(int argc, char *argv[])
{
    // The data for the pie chart
    double data[] = {21, 18, 15, 12, 8, 24};

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

    // The colors to use for the sectors
    int colors[] = {0x66aaee, 0xeebb22, 0xbbbbbb, 0x8844ff, 0xdd2222, 0x009900};

    // Create a PieChart object of size 600 x 360 pixels.
    PieChart *c = new PieChart(600, 360);

    // Use the white on black palette, which means the default text and line colors are white
    c->setColors(Chart::whiteOnBlackPalette);

    // Use a vertical gradient color from deep blue (000066) to blue (0000cc) as background. Use
    // rounded corners of 20 pixels radius. Enable soft drop shadow.
    c->setBackground(c->linearGradientColor(0, 0, 0, c->getHeight(), 0x000066, 0x0000cc));
    c->setRoundedFrame(0xffffff, 20);
    c->setDropShadow();

    // Add a title using 18pt Times New Roman Bold Italic font. Add 16 pixels top margin to the
    // title.
    c->addTitle("Exploded Pie Chart Demonstration", "timesbi.ttf", 18)->setMargin(0, 0, 16, 0);

    // Set the center of the pie at (300, 195) and the radius to 110 pixels
    c->setPieSize(300, 195, 110);

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

    // Set the sector colors
    c->setColors(Chart::DataColor, IntArray(colors, (int)(sizeof(colors) / sizeof(colors[0]))));

    // Use local gradient shading for the sectors, with 5 pixels wide semi-transparent white
    // (bbffffff) borders
    c->setSectorStyle(Chart::LocalGradientShading, 0xbbffffff, 5);

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

    // Use 10pt Arial Bold as the default label font. Set the label box background color the same as
    // the sector color. Use soft lighting effect with light direction from right. Use 8 pixels
    // rounded corners.
    TextBox *t = c->setLabelStyle("arialbd.ttf", 10, 0x000000);
    t->setBackground(Chart::SameAsMainColor, Chart::Transparent, Chart::softLighting(Chart::Right, 0
        ));
    t->setRoundedCorners(8);

    // Set the sector label format. The label is centered in a 110 pixels wide bounding box. It
    // consists of two lines. The first line is the sector name. The second line shows the data
    // value and percentage.
    c->setLabelFormat(
        "<*block,halign=center,width=110*>{label}\n<*font=arial.ttf,size=8*>US$ {value}M "
        "({percent}%)<*/*>");

    // Explode all sectors 10 pixels from the center
    c->setExplode(-1, 10);

    // Output the chart
    c->makeChart("explodedpie.png");

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