This example demonstrates the following basic steps in creating a bar chart:
- Create a XYChart object using XYChart.XYChart.
- Specify the plot area of the chart using XYChart.setPlotArea. The plot area is the rectangle bounded by the x and y axes. You should leave some margin on the outside of the plot area for axis labels, chart titles, etc.
- Specify the labels on the x-axis using Axis.setLabels.
- Add a bar layer and specify the data for the bars using XYChart.addBarLayer.
- Generate the chart using BaseChart.makeChart2.
[The following project is available in "cppdemo/simplebar".]
#include "chartdir.h"
int main(int argc, char *argv[])
{
//The data for the bar chart
double data[] = {85, 156, 179.5, 211, 123};
//The labels for the bar chart
const char *labels[] = {"Mon", "Tue", "Wed", "Thu", "Fri"};
//Create a XYChart object of size 250 x 250 pixels
XYChart *c = new XYChart(250, 250);
//Set the plotarea at (30, 20) and of size 200 x 200 pixels
c->setPlotArea(30, 20, 200, 200);
//Add a bar chart layer using the given data
c->addBarLayer(DoubleArray(data, sizeof(data)/sizeof(*data)));
//Set the x axis labels using the given labels
c->xAxis()->setLabels(StringArray(labels, sizeof(labels)/sizeof(*labels)));
//output the chart
c->makeChart("simplebar.png");
//free up resources
delete c;
return 0;
}
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