/** Example to show use of SimplePlot class
 * Simon George, 1 Oct 2001.
 */
public class SimplePlotTest {

    public static void testHistogram()
    {
	// some arbitrary data to use for bin heights
	double[] binData = { 1, 3, 17, 21, 33, 14, 3, 2, 5, 9, 2, 0 };
	SimplePlot p = new SimplePlot();
	p.setTitle("Example Histogram");
	p.setXLabel("x");
        p.setYLabel("count");
	p.drawHistogram("my data", 0, 24, binData);
    }

    public static void testCurve()
    {
	// calculate some points to plot using method f defined below
	// put them in arrays x & y
	double xMin = 0.0;
	double xMax = 3.0;
	double[] x = new double[30];
	double[] y = new double[x.length];
	for (int i=0; i<x.length; i++){
	    x[i] = xMin + ((double)i/x.length) * (xMax - xMin);
	    y[i] = f(x[i]);
	}
	// make the plot
	SimplePlot p = new SimplePlot();
	p.setTitle("Example curve");
        p.setXLabel("x");
	p.setYLabel("f(x)");
	p.drawCurve("f(x)=exp(-x/2)", x, y);
    }

    public static void testScatter()
    {
	// calculate two sets of points to plot, sampled from sin and cos
        // functions, put them in arrays y & z vs x.
	double[] x = new double[60];
	double[] y = new double[x.length];
	double[] z = new double[x.length];
	for (int i=0; i<x.length; i++){
	    x[i] = Math.random() * 2.0* Math.PI;
	    y[i] = Math.sin(x[i]);
	    z[i] = Math.cos(x[i]);
	}
	// set up the plot
	SimplePlot p = new SimplePlot();
	p.setTitle("Example scatter");
        p.setXLabel("x");
	p.setYLabel("y");
	p.setConnected(false); // turn off lines between points => scatter plot
	p.setMarksStyle("various"); // can be: none, points, dots, various
	p.drawCurve("sin(x)", x, y); // first set of points
	p.drawCurve("cos(x)", x, z); // second set, will be shown in a different colour
    }

    public static double f(double x){
	final double tau = 2.0;
	return Math.exp(-x/tau);
    }

    public static void main(String[] args)
    {
	testHistogram();
	testCurve();
        testScatter();
    }
}