ChartDirector 6.0 (C++ Edition)

Simple Gantt Chart




This example demonstrates a simple gantt chart.

This chart is created by using a horizontal box-whisker layer, in which only the "box" part of the box-whisker layer is used. Date/time values are used as box data, resulting in a gantt chart.

The key features demonstrated in this example are:

Source Code Listing

[The following code is available in "cppdemo/gantt". 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[])
{
    // data for the gantt chart, representing the start date, end date and names for various
    // activities
    double startDate[] = {Chart::chartTime(2004, 8, 16), Chart::chartTime(2004, 8, 30),
        Chart::chartTime(2004, 9, 13), Chart::chartTime(2004, 9, 20), Chart::chartTime(2004, 9, 27),
        Chart::chartTime(2004, 10, 4), Chart::chartTime(2004, 10, 25), Chart::chartTime(2004, 11, 1
        ), Chart::chartTime(2004, 11, 8)};
    double endDate[] = {Chart::chartTime(2004, 8, 30), Chart::chartTime(2004, 9, 13),
        Chart::chartTime(2004, 9, 27), Chart::chartTime(2004, 10, 4), Chart::chartTime(2004, 10, 11
        ), Chart::chartTime(2004, 11, 8), Chart::chartTime(2004, 11, 8), Chart::chartTime(2004, 11,
        22), Chart::chartTime(2004, 11, 22)};
    const char *labels[] = {"Market Research", "Define Specifications", "Overall Archiecture",
        "Project Planning", "Detail Design", "Software Development", "Test Plan", "Testing and QA",
        "User Documentation"};

    // Create a XYChart object of size 620 x 280 pixels. Set background color to light blue
    // (ccccff), with 1 pixel 3D border effect.
    XYChart *c = new XYChart(620, 280, 0xccccff, 0x000000, 1);

    // Add a title to the chart using 15 points Times Bold Itatic font, with white (ffffff) text on
    // a deep blue (000080) background
    c->addTitle("Simple Gantt Chart Demo", "timesbi.ttf", 15, 0xffffff)->setBackground(0x000080);

    // Set the plotarea at (140, 55) and of size 460 x 200 pixels. Use alternative white/grey
    // background. Enable both horizontal and vertical grids by setting their colors to grey
    // (c0c0c0). Set vertical major grid (represents month boundaries) 2 pixels in width
    c->setPlotArea(140, 55, 460, 200, 0xffffff, 0xeeeeee, Chart::LineColor, 0xc0c0c0, 0xc0c0c0
        )->setGridWidth(2, 1, 1, 1);

    // swap the x and y axes to create a horziontal box-whisker chart
    c->swapXY();

    // Set the y-axis scale to be date scale from Aug 16, 2004 to Nov 22, 2004, with ticks every 7
    // days (1 week)
    c->yAxis()->setDateScale(Chart::chartTime(2004, 8, 16), Chart::chartTime(2004, 11, 22), 86400 *
        7);

    // Set multi-style axis label formatting. Month labels are in Arial Bold font in "mmm d" format.
    // Weekly labels just show the day of month and use minor tick (by using '-' as first character
    // of format string).
    c->yAxis()->setMultiFormat(Chart::StartOfMonthFilter(), "<*font=arialbd.ttf*>{value|mmm d}",
        Chart::StartOfDayFilter(), "-{value|d}");

    // Set the y-axis to shown on the top (right + swapXY = top)
    c->setYAxisOnRight();

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

    // Reverse the x-axis scale so that it points downwards.
    c->xAxis()->setReverse();

    // Set the horizontal ticks and grid lines to be between the bars
    c->xAxis()->setTickOffset(0.5);

    // Add a green (33ff33) box-whisker layer showing the box only.
    c->addBoxWhiskerLayer(DoubleArray(startDate, (int)(sizeof(startDate) / sizeof(startDate[0]))),
        DoubleArray(endDate, (int)(sizeof(endDate) / sizeof(endDate[0]))), DoubleArray(),
        DoubleArray(), DoubleArray(), 0x00cc00, Chart::SameAsMainColor, Chart::SameAsMainColor);

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

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