ChartDirector Ver 4.1 (C++ Edition)

Enhanced Area Chart




This example extends the Simple Area Chart example by decorating the chart using a number of chart formatting features.

Source Code Listing

[The following code is available in "cppdemo/enhancedarea". A MFC version of the code is available in "mfcdemo" (Windows edition only).]
#include "chartdir.h"

int main(int argc, char *argv[])
{
    // The data for the area chart
    double data[] = {30, 28, 40, 55, 75, 68, 54, 60, 50, 62, 75, 65, 75, 89, 60, 55,
        53, 35, 50, 66, 56, 48, 52, 65, 62};

    // The labels for the area 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 600 x 300 pixels, with a pale blue (eeeeff)
    // background, black border, 1 pixel 3D border effect and rounded corners.
    XYChart *c = new XYChart(600, 300, 0xeeeeff, 0x000000, 1);
    c->setRoundedFrame();

    // Set the plotarea at (55, 55) and of size 520 x 195 pixels, with white (ffffff)
    // background. Set horizontal and vertical grid lines to grey (cccccc).
    c->setPlotArea(55, 55, 520, 195, 0xffffff, -1, -1, 0xcccccc, 0xcccccc);

    // Add a title box to the chart using 15 pts Times Bold Italic font. The text is
    // white (ffffff) on a deep blue (000088) background, with soft lighting effect
    // from the right side.
    c->addTitle(
        "<*block,valign=absmiddle*><*img=star.png*><*img=star.png*> Performance "
        "Enhancer <*img=star.png*><*img=star.png*><*/*>", "timesbi.ttf", 15, 0xffffff
        )->setBackground(0x000088, -1, Chart::softLighting(Chart::Right));

    // Add a title to the y axis
    c->yAxis()->setTitle("Energy Concentration (KJ per liter)");

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

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

    // Add a title to the x axis using CDML
    c->xAxis()->setTitle(
        "<*block,valign=absmiddle*><*img=clock.png*>  Elapsed Time (hour)<*/*>");

    // Set the axes width to 2 pixels
    c->xAxis()->setWidth(2);
    c->yAxis()->setWidth(2);

    // Add an area layer to the chart using a gradient color that changes vertically
    // from semi-transparent red (80ff0000) to semi-transparent white (80ffffff)
    c->addAreaLayer(DoubleArray(data, sizeof(data)/sizeof(data[0])),
        c->linearGradientColor(0, 50, 0, 255, 0x80FF0000, 0x80FFFFFF));

    // Add a custom CDML text at the bottom right of the plot area as the logo
    c->addText(575, 245,
        "<*block,valign=absmiddle*><*img=small_molecule.png*> <*block*>"
        "<*font=timesbi.ttf,size=10,color=804040*>Molecular\nEngineering<*/*>"
        )->setAlignment(Chart::BottomRight);

    // output the chart
    c->makeChart("enhancedarea.png");

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