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