ChartDirector 6.0 (C++ Edition)

Bar Gap


          

This example demonstrates the effects of different bar gaps configured using BarLayer.setBarGap.

Source Code Listing

[The following code is available in "cppdemo/gapbar". 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"
#include <stdio.h>

void createChart(int chartIndex, const char *filename)
{
    char buffer[256];

    double bargap = chartIndex * 0.25 - 0.25;

    // The data for the bar chart
    double data[] = {100, 125, 245, 147, 67};

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

    // Create a XYChart object of size 150 x 150 pixels
    XYChart *c = new XYChart(150, 150);

    // Set the plotarea at (27, 20) and of size 120 x 100 pixels
    c->setPlotArea(27, 20, 120, 100);

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

    if (bargap >= 0) {
        // Add a title to display to bar gap using 8pt Arial font
        sprintf(buffer, "      Bar Gap = %g", bargap);
        c->addTitle(buffer, "arial.ttf", 8);
    } else {
        // Use negative value to mean TouchBar
        c->addTitle("      Bar Gap = TouchBar", "arial.ttf", 8);
        bargap = Chart::TouchBar;
    }

    // Add a bar chart layer using the given data and set the bar gap
    c->addBarLayer(DoubleArray(data, (int)(sizeof(data) / sizeof(data[0]))))->setBarGap(bargap);

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

    //free up resources
    delete c;
}

int main(int argc, char *argv[])
{
    createChart(0, "gapbar0.png");
    createChart(1, "gapbar1.png");
    createChart(2, "gapbar2.png");
    createChart(3, "gapbar3.png");
    createChart(4, "gapbar4.png");
    createChart(5, "gapbar5.png");
    return 0;
}