ChartDirector 6.0 (C++ Edition)

Simple Line Chart




This example demonstrates the basic steps in creating line charts.

Source Code Listing

[The following code is available in "cppdemo/simpleline". 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 line chart
    double data[] = {30, 28, 40, 55, 75, 68, 54, 60, 50, 62, 75, 65, 75, 91, 60, 55, 53, 35, 50, 66,
        56, 48, 52, 65, 62};

    // The labels for the line chart
    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 250 x 250 pixels
    XYChart *c = new XYChart(250, 250);

    // Set the plotarea at (30, 20) and of size 200 x 200 pixels
    c->setPlotArea(30, 20, 200, 200);

    // Add a line chart layer using the given data
    c->addLineLayer(DoubleArray(data, (int)(sizeof(data) / sizeof(data[0]))));

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

    // Display 1 out of 3 labels on the x-axis.
    c->xAxis()->setLabelStep(3);

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

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