ChartDirector Ver 3.0 (C++ Edition)

Custom Symbols




This examples demonstrates using external image files as data symbols. This is achieved by using DataSet.setDataSymbol2.

Source Code Listing

[The following project is available in "cppdemo/customsymbolline".]
#include "chartdir.h" int main(int argc, char *argv[]) { //The data for the chart double data0[] = {600, 800, 1200, 1500, 1800, 1900, 2000, 1950}; double data1[] = {300, 450, 500, 1000, 1500, 1600, 1650, 1600}; //The labels for the chart const char *labels[] = {"1995", "1996", "1997", "1998", "1999", "2000", "2001", "2002"}; //Create a XYChart object of size 450 x 250 pixels, with a pale yellow //(0xffffc0) background, a black border, and 1 pixel 3D border effect. XYChart *c = new XYChart(450, 250, 0xffffc0, 0, 1); //Set the plotarea at (60, 45) and of size 360 x 170 pixels, using white //(0xffffff) as the plot area background color. Turn on both horizontal and //vertical grid lines with light grey color (0xc0c0c0) c->setPlotArea(60, 45, 360, 170, 0xffffff, -1, -1, 0xc0c0c0, -1); //Add a legend box at (60, 20) (top of the chart) with horizontal layout. //Use 8 pts Arial Bold font. Set the background and border color to //Transparent. c->addLegend(60, 20, false, "arialbd.ttf", 8)->setBackground(Transparent); //Add a title to the chart using 12 pts Arial Bold/white font. Use a 1 x 2 //bitmap pattern as the background. int pattern[] = {0x40, 0x80}; c->addTitle("Information Resource Usage", "arialbd.ttf", 12, 0xffffff )->setBackground(c->patternColor(IntArray(pattern, sizeof(pattern)/sizeof(*pattern)), 2)); //Set the labels on the x axis c->xAxis()->setLabels(StringArray(labels, sizeof(labels)/sizeof(*labels))); //Reserve 8 pixels margins at both side of the x axis to avoid the first and //last symbols drawing outside of the plot area c->xAxis()->setMargin(8, 8); //Add a title to the y axis c->yAxis()->setTitle("Population"); //Add a line layer to the chart LineLayer *layer = c->addLineLayer(); //Add the first line using small_user.png as the symbol. layer->addDataSet(DoubleArray(data0, sizeof(data0)/sizeof(*data0)), 0xcf4040, "Users")->setDataSymbol("small_user.png"); //Add the first line using small_computer.png as the symbol. layer->addDataSet(DoubleArray(data1, sizeof(data1)/sizeof(*data1)), 0x40cf40, "Computers")->setDataSymbol("small_computer.png"); //Set the line width to 3 pixels layer->setLineWidth(3); //output the chart c->makeChart("customsymbolline.png"); //free up resources delete c; return 0; }