ChartDirector 6.0 (C++ Edition)

Depth Area Chart




This example demonstrates using multiple area layers with semi-transparent colors to create a depth area chart.

ChartDirector allows an XYChart to containing multiple layers of the same or different types. In this example, all layers are 3D area layers. The areas are filled using semi-transparent colors to avoid the area on the front hiding the areas at the back.

Source Code Listing

[The following code is available in "cppdemo/deptharea". 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 area chart
    double data0[] = {42, 49, 33, 38, 51, 46, 29, 41, 44, 57, 59, 52, 37, 34, 51, 56, 56, 60, 70,
        76, 63, 67, 75, 64, 51};
    double data1[] = {50, 55, 47, 34, 42, 49, 63, 62, 73, 59, 56, 50, 64, 60, 67, 67, 58, 59, 73,
        77, 84, 82, 80, 84, 89};
    double data2[] = {87, 89, 85, 66, 53, 39, 24, 21, 37, 56, 37, 22, 21, 33, 13, 17, 4, 23, 16, 25,
        9, 10, 5, 7, 6};
    const char *labels[] = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12",
        "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24"};

    // Create a XYChart object of size 350 x 230 pixels
    XYChart *c = new XYChart(350, 230);

    // Set the plotarea at (50, 30) and of size 250 x 150 pixels.
    c->setPlotArea(50, 30, 250, 150);

    // Add a legend box at (55, 0) (top of the chart) using 8pt Arial Font. Set background and
    // border to Transparent.
    c->addLegend(55, 0, false, "", 8)->setBackground(Chart::Transparent);

    // Add a title to the x axis
    c->xAxis()->setTitle("Network Load for Jun 12");

    // Add a title to the y axis
    c->yAxis()->setTitle("MBytes");

    // Set the labels on the x axis.
    c->xAxis()->setLabels(StringArray(labels, (int)(sizeof(labels) / sizeof(labels[0]))));

    // Display 1 out of 2 labels on the x-axis. Show minor ticks for remaining labels.
    c->xAxis()->setLabelStep(2, 1);

    // Add three area layers, each representing one data set. The areas are drawn in
    // semi-transparent colors.
    c->addAreaLayer(DoubleArray(data2, (int)(sizeof(data2) / sizeof(data2[0]))), 0x808080ff,
        "Server #1", 3);
    c->addAreaLayer(DoubleArray(data0, (int)(sizeof(data0) / sizeof(data0[0]))), 0x80ff0000,
        "Server #2", 3);
    c->addAreaLayer(DoubleArray(data1, (int)(sizeof(data1) / sizeof(data1[0]))), 0x8000ff00,
        "Server #3", 3);

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

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