ChartDirector 6.0 (C++ Edition)

Pattern Area Chart




This example demonstrates using a pattern for filling the area in an area chart, together with a number of chart formatting features.

Source Code Listing

[The following code is available in "cppdemo/patternarea". 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[] = {3.0, 2.8, 4.0, 5.5, 7.5, 6.8, 5.4, 6.0, 5.0, 6.2, 7.5, 6.5, 7.5, 8.1, 6.0, 5.5,
        5.3, 3.5, 5.0, 6.6, 5.6, 4.8, 5.2, 6.5, 6.2};

    // 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 300 x 180 pixels. Set the background to pale yellow
    // (0xffffa0) with a black border (0x0)
    XYChart *c = new XYChart(300, 180, 0xffffa0, 0x000000);

    // Set the plotarea at (45, 35) and of size 240 x 120 pixels. Set the background to white
    // (0xffffff). Set both horizontal and vertical grid lines to black (&H0&) dotted lines (pattern
    // code 0x0103)
    c->setPlotArea(45, 35, 240, 120, 0xffffff, -1, -1, c->dashLineColor(0x000000, 0x000103),
        c->dashLineColor(0x000000, 0x000103));

    // Add a title to the chart using 10pt Arial Bold font. Use a 1 x 2 bitmap pattern as the
    // background. Set the border to black (0x0).
    int pattern1[] = {0xb0b0f0, 0xe0e0ff};
    c->addTitle("Snow Percipitation (Dec 12)", "arialbd.ttf", 10)->setBackground(c->patternColor(
        IntArray(pattern1, (int)(sizeof(pattern1) / sizeof(pattern1[0]))), 2), 0x000000);

    // Add a title to the y axis
    c->yAxis()->setTitle("mm per hour");

    // 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 an area layer to the chart
    AreaLayer *layer = c->addAreaLayer();

    // Load a snow pattern from an external file "snow.png".
    int snowPattern = c->patternColor("snow.png");

    // Add a data set to the area layer using the snow pattern as the fill color. Use deep blue
    // (0x0000ff) as the area border line color (&H0000ff&)
    layer->addDataSet(DoubleArray(data, (int)(sizeof(data) / sizeof(data[0]))))->setDataColor(
        snowPattern, 0x0000ff);

    // Set the line width to 2 pixels to highlight the line
    layer->setLineWidth(2);

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

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