ChartDirector 7.1 (C++ Edition)

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.

Source Code Listing

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; }