ChartDirector 6.0 (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/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 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 360 pixels, with a brushed silver background, 1 pixel
    // 3D border effect, rounded corners and soft drop shadow.
    XYChart *c = new XYChart(600, 360, Chart::brushedSilverColor(), Chart::Transparent, 1);
    c->setRoundedFrame();
    c->setDropShadow();

    // Add a title box to the chart using 18pt Times Bold Italic font.
    TextBox *title = c->addTitle(
        "<*block,valign=absmiddle*><*img=star.png*><*img=star.png*> Performance Enhancer "
        "<*img=star.png*><*img=star.png*><*/*>", "timesbi.ttf", 18);

    //
    // Use a text box with a depressed 3D border to create the inner depressed region
    //

    // The width of the frame border
    int frameWidth = 5;

    // Set the depressed region position
    TextBox *contentBox = c->addText(frameWidth, title->getHeight(), "");
    contentBox->setSize(c->getDrawArea()->getWidth() - 1 - frameWidth * 2, c->getDrawArea(
        )->getHeight() - title->getHeight() - frameWidth - 1);

    // Use -1 as the rasied effect to create a depressed region
    contentBox->setBackground(Chart::Transparent, Chart::Transparent, -1);

    // Set rounded corners, and put the text box at the back of the chart
    contentBox->setRoundedCorners(10);
    contentBox->setZOrder(Chart::ChartBackZ);

    // Tentatively set the plotarea to 50 pixels from the left depressed edge, and 25 pixels under
    // the top depressed edge. Set the width to 75 pixels less than the depressed region width, and
    // the height to 75 pixels less than the depressed region height. Use white (ffffff) background,
    // transparent border, and grey (cccccc) horizontal and vertical grid lines.
    PlotArea *plotArea = c->setPlotArea(50 + contentBox->getLeftX(), contentBox->getTopY() + 25,
        contentBox->getWidth() - 75, contentBox->getHeight() - 75, 0xffffff, -1, -1, 0xcccccc, -1);

    // 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, (int)(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 (60ff0000) to semi-transparent white (60ffffff)
    c->addAreaLayer(DoubleArray(data, (int)(sizeof(data) / sizeof(data[0]))),
        c->linearGradientColor(0, contentBox->getTopY() + 20, 0, contentBox->getTopY() +
        contentBox->getHeight() - 50, 0x60ff0000, 0x60ffffff));

    // Adjust the plot area size, such that the bounding box (inclusive of axes) is 15 pixels from
    // the left depressed edge, 25 pixels below the top depressed edge, 25 pixels from the right
    // depressed edge, and 15 pixels above the bottom depressed edge.
    c->packPlotArea(contentBox->getLeftX() + 15, contentBox->getTopY() + 25, contentBox->getLeftX()
         + contentBox->getWidth() - 25, contentBox->getTopY() + contentBox->getHeight() - 15);

    // Add a custom CDML text with the bottom right corner is anchored to the bootom right corner of
    // the plot area, with 5 pixels margin.
    c->addText(plotArea->getLeftX() + plotArea->getWidth() - 5, plotArea->getTopY() +
        plotArea->getHeight() - 5,
        "<*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.jpg");

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