ChartDirector 6.0 (C++ Edition)

Depth Bar Chart




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

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

Source Code Listing

[The following code is available in "cppdemo/depthbar". 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 bar chart
    double data0[] = {100, 125, 245, 147, 67};
    double data1[] = {85, 156, 179, 211, 123};
    double data2[] = {97, 87, 56, 267, 157};

    // The labels for the bar chart
    const char *labels[] = {"Mon", "Tue", "Wed", "Thu", "Fri"};

    // Create a XYChart object of size 500 x 320 pixels
    XYChart *c = new XYChart(500, 320);

    // Set the plotarea at (100, 40) and of size 280 x 240 pixels
    c->setPlotArea(100, 40, 280, 240);

    // Add a legend box at (405, 100)
    c->addLegend(405, 100);

    // Add a title to the chart
    c->addTitle("Weekday Network Load");

    // Add a title to the y axis. Draw the title upright (font angle = 0)
    c->yAxis()->setTitle("Average\nWorkload\n(MBytes\nPer Hour)")->setFontAngle(0);

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

    // Add three bar layers, each representing one data set. The bars are drawn in semi-transparent
    // colors.
    c->addBarLayer(DoubleArray(data0, (int)(sizeof(data0) / sizeof(data0[0]))), 0x808080ff,
        "Server # 1", 5);
    c->addBarLayer(DoubleArray(data1, (int)(sizeof(data1) / sizeof(data1[0]))), 0x80ff0000,
        "Server # 2", 5);
    c->addBarLayer(DoubleArray(data2, (int)(sizeof(data2) / sizeof(data2[0]))), 0x8000ff00,
        "Server # 3", 5);

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

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