ChartDirector Ver 3.0 (C++ Edition)

Spline Line Chart




This example demonstrates using spline curves to join data points, as well as a number of advanced chart formatting techniques.

Source Code Listing

[The following project is available in "cppdemo/splineline".]
#include "chartdir.h" int main(int argc, char *argv[]) { //The data for the chart double data0[] = {32, 39, 23, 28, 41, 36}; double data1[] = {50, 55, 47, 34, 47, 56}; //The labels for the chart const char *labels[] = {"0", "1", "2", "3", "4", "5"}; //Create a XYChart object of size 500 x 300 pixels, using 0xf0e090 as the //background color, with a black border, and 1 pixel 3D border effect. XYChart *c = new XYChart(500, 300, 0xf0e090, 0x0, 1); //Set the plotarea at (55, 50) and of size 420 x 205 pixels, using 0xfff0c0 //as the plot area background color, and 0xa08040 as the grid and border //colors. Turn on both horizontal and vertical grid lines with light grey //color (0xc0c0c0) c->setPlotArea(55, 50, 420, 205, 0xfff0c0, -1, 0xa08040, 0xa08040, 0xa08040) ; //Add a legend box at (55, 25) (top of the chart) with horizontal layout. //Use 8 pts Arial font. Set the background and border color to Transparent. c->addLegend(55, 25, false, "", 8)->setBackground(Transparent); //Add a title box to the chart using 13 pts Arial Bold Italic font. The //title is in CDML and includes embedded images for highlight. The text is //white (0xffffff) on a brown (0x807040) background, with a 1 pixel 3D //border. c->addTitle( "<*block,valign=absmiddle*><*img=star.png*><*img=star.png*> " "Performance Enhancer <*img=star.png*><*img=star.png*><*/*>", "arialbi.ttf", 13, 0xffffff)->setBackground(0x807040, -1, 1); //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, sizeof(labels)/sizeof(*labels))); //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 (0xc0) as the line color, //with yellow (0xffff00) circle symbols. layer->addDataSet(DoubleArray(data1, sizeof(data1)/sizeof(*data1)), 0xc0, "Target Group")->setDataSymbol(CircleSymbol, 9, 0xffff00); //Add a data set to the spline layer, using brown (0x982810) as the line //color, with pink (0xf040f0) diamond symbols. layer->addDataSet(DoubleArray(data0, sizeof(data0)/sizeof(*data0)), 0x982810, "Control Group")->setDataSymbol(DiamondSymbol, 9, 0xf040f0); //Add a custom CDML text at the bottom right of the plot area as the logo c->addText(475, 255, "<*block,valign=absmiddle*><*img=small_molecule.png*> <*block*>" "<*font=timesbi.ttf,size=10,color=804040*>Molecular\nEngineering<*/*>" )->setAlignment(BottomRight); //output the chart c->makeChart("splineline.png"); //free up resources delete c; return 0; }