ChartDirector 6.0 (C++ Edition)

Icon Pie Chart (2)




This example extends the Icon Pie Chart (1) example to demonstrate using CDML to include multiple fonts and colors in chart title, sector labels and to draw logo. It also demonstrates silver background color, rounded corners, and glass shading effect for title.

Source Code Listing

[The following code is available in "cppdemo/iconpie2". 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[] = {28, 45, 5, 1, 12};

    // The labels for the pie chart
    const char *labels[] = {"Excellent", "Good", "Bad", "Very Bad", "Neutral"};

    // The icons for the sectors
    const char *icons[] = {"laugh.png", "smile.png", "sad.png", "angry.png", "nocomment.png"};

    // Create a PieChart object of size 560 x 300 pixels, with a silver background, black border, 1
    // pxiel 3D border effect and rounded corners
    PieChart *c = new PieChart(560, 300, Chart::silverColor(), 0x000000, 1);
    c->setRoundedFrame();

    // Set the center of the pie at (280, 150) and the radius to 120 pixels
    c->setPieSize(280, 150, 120);

    // Add a title box with title written in CDML, on a sky blue (A0C8FF) background with glass
    // effect
    c->addTitle(
        "<*block,valign=absmiddle*><*img=doc.png*> Customer Survey: "
        "<*font=timesi.ttf,color=000000*>Do you like our <*font,color=dd0000*>Hyper<*super*>TM"
        "<*/font*> molecules?", "timesbi.ttf", 15, 0x000080)->setBackground(0xa0c8ff, 0x000000,
        Chart::glassEffect());

    // Add a logo to the chart written in CDML as the bottom title aligned to the bottom right
    c->addTitle(Chart::BottomRight,
        "<*block,valign=absmiddle*><*img=molecule.png*> <*block*><*color=FF*>"
        "<*font=timesbi.ttf,size=12*>Molecular Engineering\n<*font=arial.ttf,size=10*>Creating "
        "better molecules");

    // 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 3D style
    c->set3D();

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

    // Set the label background color to transparent
    c->setLabelStyle()->setBackground(Chart::Transparent);

    // 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}*> {label} ({percent|0}%)");

    // Explode the 3rd and 4th sectors as a group (index = 2 and 3)
    c->setExplodeGroup(2, 3);

    // Set the start angle to 135 degrees may improve layout when there are many small sectors at
    // the end of the data array (that is, data sorted in descending order). It is because this
    // makes the small sectors position near the horizontal axis, where the text label has the least
    // tendency to overlap. For data sorted in ascending order, a start angle of 45 degrees can be
    // used instead.
    c->setStartAngle(135);

    // Output the chart
    c->makeChart("iconpie2.png");

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