ChartDirector Ver 3.0 (C++ Edition)

Scatter Chart




This example demonstrates a scatter chart created using XYChart.addScatterLayer, together with a number of chart formatting functions.

Source Code Listing

[The following project is available in "cppdemo/scatter".]
#include "chartdir.h" int main(int argc, char *argv[]) { //The XY points for the scatter chart double dataX0[] = {10, 15, 6, 12, 14, 8, 13, 13, 16, 12, 10.5}; double dataY0[] = {130, 150, 80, 110, 110, 105, 130, 115, 170, 125, 125}; double dataX1[] = {6, 12, 4, 3.5, 7, 8, 9, 10, 12, 11, 8}; double dataY1[] = {65, 80, 40, 45, 70, 80, 80, 90, 100, 105, 60}; //Create a XYChart object of size 450 x 420 pixels XYChart *c = new XYChart(450, 420); //Set the plotarea at (55, 65) and of size 350 x 300 pixels, with a light //grey border (0xc0c0c0). Turn on both horizontal and vertical grid lines //with light grey color (0xc0c0c0) c->setPlotArea(55, 65, 350, 300, -1, -1, 0xc0c0c0, 0xc0c0c0, -1); //Add a legend box at (50, 30) (top of the chart) with horizontal layout. //Use 12 pts Times Bold Italic font. Set the background and border color to //Transparent. c->addLegend(50, 30, false, "timesbi.ttf", 12)->setBackground(Transparent); //Add a title to the chart using 18 pts Times Bold Itatic font. c->addTitle("Genetically Modified Predator", "timesbi.ttf", 18); //Add a title to the y axis using 12 pts Arial Bold Italic font c->yAxis()->setTitle("Length (cm)", "arialbi.ttf", 12); //Add a title to the x axis using 12 pts Arial Bold Italic font c->xAxis()->setTitle("Weight (kg)", "arialbi.ttf", 12); //Set the axes line width to 3 pixels c->xAxis()->setWidth(3); c->yAxis()->setWidth(3); //Add an orange (0xff9933) scatter chart layer, using 13 pixel diamonds as //symbols c->addScatterLayer(DoubleArray(dataX0, sizeof(dataX0)/sizeof(*dataX0)), DoubleArray(dataY0, sizeof(dataY0)/sizeof(*dataY0)), "Genetically Engineered", DiamondSymbol, 13, 0xff9933); //Add a green (0x33ff33) scatter chart layer, using 11 pixel triangles as //symbols c->addScatterLayer(DoubleArray(dataX1, sizeof(dataX1)/sizeof(*dataX1)), DoubleArray(dataY1, sizeof(dataY1)/sizeof(*dataY1)), "Natural", TriangleSymbol, 11, 0x33ff33); //output the chart c->makeChart("scatter.png"); //free up resources delete c; return 0; }