ChartDirector 6.0 (C++ Edition)

Multi-Cylinder Chart




This example demonstrates a multi-bar chart with cylinder shading effects. It also demonstrates using dotted line style for grid lines.

The cylinder shading effect is the result of using the cylinder bar shape in 2D. This is by using BarLayer.setBarShape with CircleShape.

The dotted grid lines in this example is configured by using BaseChart.dashLineColor to define the dotted line color, then use it in XYChart.setPlotArea as the the grid line color.

Source Code Listing

[The following code is available in "cppdemo/multicylinder". 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[])
{
    // Data for the chart
    double data0[] = {100, 125, 245, 147, 67, 96, 160, 145, 97, 167, 220, 125};
    double data1[] = {85, 156, 179, 211, 123, 225, 127, 99, 111, 260, 175, 156};
    double data2[] = {97, 87, 56, 267, 157, 157, 67, 156, 77, 87, 197, 87};
    const char *labels[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct",
        "Nov", "Dec"};

    // Create a XYChart object of size 560 x 280 pixels.
    XYChart *c = new XYChart(560, 280);

    // Add a title to the chart using 14pt Arial Bold Italic font
    c->addTitle("     Average Weekly Network Load", "arialbi.ttf", 14);

    // Set the plotarea at (50, 50) and of 500 x 200 pixels in size. Use alternating light grey
    // (f8f8f8) / white (ffffff) background. Set border to transparent and use grey (CCCCCC) dotted
    // lines as horizontal and vertical grid lines
    c->setPlotArea(50, 50, 500, 200, 0xffffff, 0xf8f8f8, Chart::Transparent, c->dashLineColor(
        0xcccccc, Chart::DotLine), c->dashLineColor(0xcccccc, Chart::DotLine));

    // Add a legend box at (50, 22) using horizontal layout. Use 10 pt Arial Bold Italic font, with
    // transparent background
    c->addLegend(50, 22, false, "arialbi.ttf", 10)->setBackground(Chart::Transparent);

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

    // Draw the ticks between label positions (instead of at label positions)
    c->xAxis()->setTickOffset(0.5);

    // Add axis title
    c->yAxis()->setTitle("Throughput (MBytes Per Hour)");

    // Set axis line width to 2 pixels
    c->xAxis()->setWidth(2);
    c->yAxis()->setWidth(2);

    // Add a multi-bar layer with 3 data sets
    BarLayer *layer = c->addBarLayer(Chart::Side);
    layer->addDataSet(DoubleArray(data0, (int)(sizeof(data0) / sizeof(data0[0]))), 0xff0000,
        "Server #1");
    layer->addDataSet(DoubleArray(data1, (int)(sizeof(data1) / sizeof(data1[0]))), 0x00ff00,
        "Server #2");
    layer->addDataSet(DoubleArray(data2, (int)(sizeof(data2) / sizeof(data2[0]))), 0x0000ff,
        "Server #3");

    // Set bar shape to circular (cylinder)
    layer->setBarShape(Chart::CircleShape);

    // Configure the bars within a group to touch each others (no gap)
    layer->setBarGap(0.2, Chart::TouchBar);

    // Output the chart
    c->makeChart("multicylinder.png");

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