ChartDirector Ver 3.0 (C++ Edition)

Rotated Area Chart




This example demonstrates swapping the x and y axes to produce an rotated area chart in which the area goes from left to right (instead of bottom to top).

The x and y axes in the example are configured as follows:

The area in this chart is filled using a gradient color created with BaseChart.gradientColor.

Source Code Listing

[The following project is available in "cppdemo/rotatedarea".]
#include "chartdir.h" int main(int argc, char *argv[]) { //The data for the area chart double data[] = {30, 28, 40, 55, 75, 68, 54, 60, 50, 62, 75, 65, 75, 89, 60, 55, 53, 35, 50, 66, 56, 48, 52, 65, 62}; //The labels for the area chart const char *labels[] = {"0 m", "", "", "3 m", "", "", "6 m", "", "", "9 m", "", "", "12 m", "", "", "15 m", "", "", "18 m", "", "", "21 m", "", "", "24 m"}; //Create a XYChart object of size 320 x 320 pixels XYChart *c = new XYChart(320, 320); //Swap the x and y axis to become a rotated chart c->swapXY(); //Set the y axis on the top side (right + rotated = top) c->setYAxisOnRight(); //Reverse the x axis so it is pointing downwards c->xAxis()->setReverse(); //Set the plotarea at (50, 50) and of size 200 x 200 pixels. Enable //horizontal and vertical grids by setting their colors to grey (0xc0c0c0). c->setPlotArea(50, 50, 250, 250)->setGridColor(0xc0c0c0, 0xc0c0c0); //Add a line chart layer using the given data c->addAreaLayer(DoubleArray(data, sizeof(data)/sizeof(*data)), c->gradientColor(50, 0, 300, 0, 0xffffff, 0xff)); //Set the x axis labels using the given labels c->xAxis()->setLabels(StringArray(labels, sizeof(labels)/sizeof(*labels))); //Add a title to the x axis c->xAxis()->setTitle("Depth"); //Add a title to the y axis c->yAxis()->setTitle("Carbon Dioxide Concentration (ppm)"); //output the chart c->makeChart("rotatedarea.png"); //free up resources delete c; return 0; }