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.

The gradient background is achieved by using BaseChart.linearGradientColor to define the gradient color, then use BaseChart.setBackground to set it as the chart background color.
The rounded frame is configured using BaseChart.setRoundedFrame.
The soft drop shadow is configured using BaseChart.setDropShadow.
The sector colors are set using BaseChart.setColors. The sector gradient shading and thick sector border is configured using PieChart.setSectorStyle.
The sector label style are configured using PieChart.setLabelStyle. It returns a TextBox object representing the sector label prototype. The gradient background color and rounded corners of the sector labels are configured using the Box.setBackground and Box.setRoundedCorners methods of the label prototype.
The sector label contents are configured using PieChart.setLabelFormat. The template is specified using CDML and Parameter Substitution and Formatting. It consists of two lines using different fonts. This first line shows the sector label, while the second line shows the sector value and percentage.

The following is the command line version of the code in "cppdemo/explodedpie". The MFC version of the code is in "mfcdemo/mfcdemo". The Qt Widgets version of the code is in "qtdemo/qtdemo". The QML/Qt Quick version of the code is in "qmldemo/qmldemo".

#include "chartdir.h"

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

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

    // The colors to use for the sectors
    int colors[] = {0x66aaee, 0xeebb22, 0xbbbbbb, 0x8844ff, 0xdd2222, 0x009900};
    const int colors_size = (int)(sizeof(colors)/sizeof(*colors));

    // 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", "Times New Roman Bold Italic", 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, data_size), StringArray(labels, labels_size));

    // Set the sector colors
    c->setColors(Chart::DataColor, IntArray(colors, colors_size));

    // 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("Arial Bold", 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,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;
}