Log Scale Axis

The following is the command line version of the code in "cppdemo/logaxis". The MFC version of the code is in "mfcdemo/mfcdemo". The Qt Widgets version of the code is in "qtdemo/qtdemo". The QML/Qt Quick version of the code is in "qmldemo/qmldemo".

#include "chartdir.h"

void createChart(int chartIndex, const char *filename)
{
    // The data for the chart
    double data[] = {100, 125, 260, 147, 67};
    const int data_size = (int)(sizeof(data)/sizeof(*data));
    const char* labels[] = {"Mon", "Tue", "Wed", "Thu", "Fri"};
    const int labels_size = (int)(sizeof(labels)/sizeof(*labels));

    // Create a XYChart object of size 200 x 180 pixels
    XYChart* c = new XYChart(200, 180);

    // Set the plot area at (30, 10) and of size 140 x 130 pixels
    c->setPlotArea(30, 10, 140, 130);

    // Ise log scale axis if required
    if (chartIndex == 1) {
        c->yAxis()->setLogScale();
    }

    // Set the labels on the x axis
    c->xAxis()->setLabels(StringArray(labels, labels_size));

    // Add a color bar layer using the given data. Use a 1 pixel 3D border for the bars.
    c->addBarLayer(DoubleArray(data, data_size), IntArray(0, 0))->setBorderColor(-1, 1);

    // Output the chart
    c->makeChart(filename);

    //free up resources
    delete c;

}

int main(int argc, char *argv[])
{
    createChart(0, "logaxis0.png");
    createChart(1, "logaxis1.png");
    return 0;
}