Icon Donut Chart

This example modifies the Icon Pie Chart example by using a semi-transparent donut instead of a pie, and using metallic background color.

BaseChart.setColors is used to select the default semi-transparent palette transparentPalette. This palette uses semi-transparent data colors instead of the normal data colors.
Chart::metalColor is used to create metallic colors using light blue and blue as the base colors. The colors are then used as the chart background color by calling BaseChart.setBackground, and as chart title background color by calling Box.setBackground of the title TextBox object.

The following is the command line version of the code in "cppdemo/icondonut". 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[] = {72, 18, 15, 12};
    const int data_size = (int)(sizeof(data)/sizeof(*data));

    // The depths for the sectors
    double depths[] = {30, 20, 10, 10};
    const int depths_size = (int)(sizeof(depths)/sizeof(*depths));

    // The labels for the pie chart
    const char* labels[] = {"Sunny", "Cloudy", "Rainy", "Snowy"};
    const int labels_size = (int)(sizeof(labels)/sizeof(*labels));

    // The icons for the sectors
    const char* icons[] = {"sun.png", "cloud.png", "rain.png", "snowy.png"};
    const int icons_size = (int)(sizeof(icons)/sizeof(*icons));

    // Create a PieChart object of size 400 x 300 pixels
    PieChart* c = new PieChart(400, 300);

    // Use the semi-transparent palette for this chart
    c->setColors(Chart::transparentPalette);

    // Set the background to metallic light blue (CCFFFF), with a black border and 1 pixel 3D border
    // effect,
    c->setBackground(Chart::metalColor(0xccccff), 0x000000, 1);

    // Set donut center at (200, 175), and outer/inner radii as 100/50 pixels
    c->setDonutSize(200, 175, 100, 50);

    // Add a title box using 15pt Times Bold Italic font and metallic blue (8888FF) background color
    c->addTitle("Weather Profile in Wonderland", "Times New Roman Bold Italic", 15)->setBackground(
        Chart::metalColor(0x8888ff));

    // Set the pie data and the pie labels
    c->setData(DoubleArray(data, data_size), StringArray(labels, labels_size));

    // Add icons to the chart as a custom field
    c->addExtraField(StringArray(icons, icons_size));

    // Configure the sector labels using CDML to include the icon images
    c->setLabelFormat(
        "<*block,valign=absmiddle*><*img={field0}*> <*block*>{label}\n{percent}%<*/*><*/*>");

    // Draw the pie in 3D with variable 3D depths
    c->set3D(DoubleArray(depths, depths_size));

    // Set the start angle to 225 degrees may improve layout when the depths of the sector are
    // sorted in descending order, because it ensures the tallest sector is at the back.
    c->setStartAngle(225);

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

    //free up resources
    delete c;

    return 0;
}