Spline Line Chart

This example demonstrates using spline curves to join data points, title with soft lighting effect, as well as a number of chart formatting techniques.

Add a spline layer to the chart using XYChart.addSplineLayer.
Set the shapes, sizes and colors of the data symbols using DataSet.setDataSymbol.
The soft lighting effect of the title is defined using Chart::softLighting, then applied to the title using Box.setBackground of the title TextBox object.
Set the background, border and grid colors of the plot area using XYChart.setPlotArea.
Control the line width of the axes using Axis.setWidth.
Include icon images in chart and axis titles using CDML.
Add a logo at the bottom right corner of the plot area as custom text using BaseChart.addText with BottomRight alignment. The logo includes images and text encoded using CDML.

The following is the command line version of the code in "cppdemo/splineline". The MFC version of the code is in "mfcdemo/mfcdemo". The Qt Widgets version of the code is in "qtdemo/qtdemo". The QML/Qt Quick version of the code is in "qmldemo/qmldemo".

#include "chartdir.h"

int main(int argc, char *argv[])
{
    // The data for the chart
    double data0[] = {32, 39, 23, 28, 41, 38, 26, 35, 29};
    const int data0_size = (int)(sizeof(data0)/sizeof(*data0));
    double data1[] = {50, 55, 47, 34, 47, 53, 38, 40, 51};
    const int data1_size = (int)(sizeof(data1)/sizeof(*data1));

    // The labels for the chart
    const char* labels[] = {"0", "1", "2", "3", "4", "5", "6", "7", "8"};
    const int labels_size = (int)(sizeof(labels)/sizeof(*labels));

    // Create a XYChart object of size 600 x 300 pixels, with a pale red (ffdddd) background, black
    // border, 1 pixel 3D border effect and rounded corners.
    XYChart* c = new XYChart(600, 300, 0xffdddd, 0x000000, 1);
    c->setRoundedFrame();

    // Set the plotarea at (55, 58) and of size 520 x 195 pixels, with white (ffffff) background.
    // Set horizontal and vertical grid lines to grey (cccccc).
    c->setPlotArea(55, 58, 520, 195, 0xffffff, -1, -1, 0xcccccc, 0xcccccc);

    // Add a legend box at (55, 32) (top of the chart) with horizontal layout. Use 9pt Arial Bold
    // font. Set the background and border color to Transparent.
    c->addLegend(55, 32, false, "Arial Bold", 9)->setBackground(Chart::Transparent);

    // Add a title box to the chart using 15pt Times Bold Italic font. The title is in CDML and
    // includes embedded images for highlight. The text is white (ffffff) on a dark red (880000)
    // 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*><*/*>", "Times New Roman Bold Italic", 15, 0xffffff
        )->setBackground(0x880000, -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, labels_size));

    // Add a title to the x axis using CMDL
    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 a spline layer to the chart
    SplineLayer* layer = c->addSplineLayer();

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

    // Add a data set to the spline layer, using blue (0000c0) as the line color, with yellow
    // (ffff00) circle symbols.
    layer->addDataSet(DoubleArray(data1, data1_size), 0x0000c0, "Target Group")->setDataSymbol(
        Chart::CircleSymbol, 9, 0xffff00);

    // Add a data set to the spline layer, using brown (982810) as the line color, with pink
    // (f040f0) diamond symbols.
    layer->addDataSet(DoubleArray(data0, data0_size), 0x982810, "Control Group")->setDataSymbol(
        Chart::DiamondSymbol, 11, 0xf040f0);

    // Add a custom CDML text at the bottom right of the plot area as the logo
    c->addText(575, 250,
        "<*block,valign=absmiddle*><*img=small_molecule.png*> <*block*><*font=Times New Roman Bold "
        "Italic,size=10,color=804040*>Molecular\nEngineering<*/*>")->setAlignment(Chart::BottomRight
        );

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

    //free up resources
    delete c;

    return 0;
}