ChartDirector Ver 4.1 (C++ Edition)

Cylinder Bar Shading




This example demonstrates using cylinder shading effect for bars and gradient color for plot area background. It also demonstrates putting axis labels on both sides of the plot area.

The cylinder shading effect is the result of using the cylinder bar shape in 2D.

Source Code Listing

[The following code is available in "cppdemo/cylinderlightbar". 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 bar chart
    double data[] = {450, 560, 630, 800, 1100, 1350, 1600, 1950, 2300, 2700};

    // The labels for the bar chart
    const char *labels[] = {"1996", "1997", "1998", "1999", "2000", "2001", "2002",
        "2003", "2004", "2005"};

    // Create a XYChart object of size 600 x 360 pixels
    XYChart *c = new XYChart(600, 360);

    // Add a title to the chart using 18pts Times Bold Italic font
    c->addTitle("Annual Revenue for Star Tech", "timesbi.ttf", 18);

    // Set the plotarea at (60, 40) and of size 480 x 280 pixels. Use a vertical
    // gradient color from light green (eeffee) to dark green (008800) as background.
    // Set border and grid lines to white (ffffff).
    c->setPlotArea(60, 40, 480, 280, c->linearGradientColor(60, 40, 60, 280,
        0xeeffee, 0x008800), -1, 0xffffff, 0xffffff);

    // Add a multi-color bar chart layer using the supplied data. Set cylinder bar
    // shape.
    c->addBarLayer(DoubleArray(data, sizeof(data)/sizeof(data[0])), IntArray(0, 0)
        )->setBarShape(Chart::CircleShape);

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

    // Show the same scale on the left and right y-axes
    c->syncYAxis();

    // Set the left y-axis and right y-axis title using 10pt Arial Bold font
    c->yAxis()->setTitle("USD (millions)", "arialbd.ttf", 10);
    c->yAxis2()->setTitle("USD (millions)", "arialbd.ttf", 10);

    // Set all axes to transparent
    c->xAxis()->setColors(Chart::Transparent);
    c->yAxis()->setColors(Chart::Transparent);
    c->yAxis2()->setColors(Chart::Transparent);

    // Set the label styles of all axes to 8pt Arial Bold font
    c->xAxis()->setLabelStyle("arialbd.ttf", 8);
    c->yAxis()->setLabelStyle("arialbd.ttf", 8);
    c->yAxis2()->setLabelStyle("arialbd.ttf", 8);

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

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