/**
 *      Demonstration program to use the integrator class
 *      to perform a RK4 integration of the Harmonic
 *      equations with output via ptplot
 */

import uk.ac.ed.ph.integrator.*;         // Import integrator classes
import ptolemy.plot.*;                   // Import ptplot classes

public class HarmonicTest {
    public static void main(String args[]) {
	
	double omega0 = 5.0;             // Natural frequecy
	double gamma = 0.2;              // Normalsied dampling
	double omega = 5.5;              // Forcing frequecy
	double a = 4.0;                  // Forcing amplituide
	
	//           Make the differential equations.
	HarmonicEquations eqn = 
	    new HarmonicEquations(omega0,gamma,omega,a);

	//           Make the RK4 solver and attach the equations
	RungeKutta solver = new RungeKutta(eqn);

	//           Setup initial consitions, with 2 paramter
	//           DataPoint
	DataPoint initial = new DataPoint(2);
	initial.setX(0.0);                      // Set time
	initial.setY(0,0.0);                    // Position
	initial.setY(1,0.0);                    // Velocity
	

	//           Set the initial consitions in the solver.
	solver.setStartConditions(initial);
	solver.setStep(0.01);                // Inital step size
	solver.setAccuracy(1.0e-8);          // Accuracy
	solver.setAdaptiveTestInternal(100); // Steps before adaptive test
	solver.setVerbose(true);             // Set verbose output

	//            Do the solve, to x = 50 with adaptive step
	//            This stores all the data points in solver
	solver.solve(50.0,true);
	
	//            Setup output graph
	Plot plot = new Plot();
                               

	//          Read the data out of the solver point at a time
	for(int i = 0; i < solver.size(); i++ ) {
	    DataPoint p = solver.get(i);                 // Get DataPoint
	    plot.addPoint(0,p.getX(), p.getY(0),true);   // Get dislacement
	    plot.addPoint(1,p.getX(), p.getY(1),true);   // Get velocity
	}

	plot.setTitle("Harmonic Plot");      // Set plot title (optional)
        plot.setXLabel("Time");              // Set x label
        plot.setYLabel("Disp/Vel");           // Set y label

        //      Make a frame to display the plot
        PlotFrame frame = new PlotFrame("A plot",plot);
        frame.setSize(600,400);              // Set size of frame (in pixels)
        frame.setVisible(true);              // Make frame visible

    }
}