ChartDirector 6.0 (C++ Edition)

Icon Pie Chart (1)




This example demonstrates using CDML and Parameter Substitution and Formatting to include icons in sector labels. It also demonstrates gradient background color, glass shading effect for the title and rounded corners for the chart frame.

Source Code Listing

[The following code is available in "cppdemo/iconpie". 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[] = {72, 18, 15, 12};

    // The depths for the sectors
    double depths[] = {30, 20, 10, 10};

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

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

    // Create a PieChart object of size 400 x 310 pixels, with a blue (CCCCFF) vertical metal
    // gradient background, black border, 1 pixel 3D border effect and rounded corners
    PieChart *c = new PieChart(400, 310, Chart::metalColor(0xccccff, 0), 0x000000, 1);
    c->setRoundedFrame();

    // Set the center of the pie at (200, 180) and the radius to 100 pixels
    c->setPieSize(200, 180, 100);

    // Add a title box using 15pt Times Bold Italic font, on a blue (CCCCFF) background with glass
    // effect
    c->addTitle("Weather Profile in Wonderland", "timesbi.ttf", 15)->setBackground(0xccccff,
        0x000000, Chart::glassEffect());

    // 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]))));

    // Add icons to the chart as a custom field
    c->addExtraField(StringArray(icons, (int)(sizeof(icons) / sizeof(icons[0]))));

    // 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, (int)(sizeof(depths) / sizeof(depths[0]))));

    // 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("iconpie.png");

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