import java.awt.*;
import java.applet.Applet;

import GraphPanel;

public class GraphApplet extends Applet
{
	GraphPanel mainPanel;
	TextField massFld;
	TextField fuelFld;
	TextField exRateFld;
	TextField exVFld;
	TextField cdFld;

	public void init() {
		Label label;
		Panel panel;
		
		// create and use main layout
		LayoutManager mainLayout = new BorderLayout(2,2);
		setLayout( mainLayout );
		
		// create controls on the north (top) side
		panel = new Panel();
		panel.setLayout( new GridLayout(2,2, 3,3) );

		panel.add(label = new Label("Mass:"));
		label.setAlignment(Label.RIGHT);
		panel.add(massFld = new TextField("16000", 4));

		panel.add(label = new Label("Fuel:"));
		label.setAlignment(Label.RIGHT);
		panel.add(fuelFld = new TextField("13000", 4));

		panel.add(label = new Label("CD (%):"));
		label.setAlignment(Label.RIGHT);
		panel.add(cdFld = new TextField("35", 4));

		panel.add(label = new Label("Exh. Rate:"));
		label.setAlignment(Label.RIGHT);
		panel.add(exRateFld = new TextField("75", 4));

		panel.add(label = new Label("Exh. Velocity:"));
		label.setAlignment(Label.RIGHT);
		panel.add(exVFld = new TextField("2400", 4));

		panel.add(new Button("Compute"));
	
		add("North", panel );

		// create the main panel
		mainPanel = new GraphPanel();
		add("Center", mainPanel);
		mainPanel.init();

		// make up some data
		double data[] = generateData();

		// assign it to the graph
		mainPanel.setData( data );
	}
	
	public double[] generateData() {
		// set up the simulation
		
		showStatus("Generating Data...");
		
		Planet Earth = new Planet();
		Rocket r = new Rocket(Earth);
		r.mass = Integer.parseInt(massFld.getText().trim());
		r.fuel_mass = Integer.parseInt(fuelFld.getText().trim());
		r.exhaust_rate = Integer.parseInt(exRateFld.getText().trim());
		r.V_exhaust = Integer.parseInt(exVFld.getText().trim());
		r.cd = Integer.parseInt(cdFld.getText().trim()) / 100.0;
		r.area = 3.6;		// area of 3x1.5 ellipse, plus a little for wings

		// run the simulation, and record the data
		
		double data[] = new double[401];
		mainPanel.xScale = 2;		// ick -- should do this elsewhere
		for (int t=0; t<401; t++) {
			data[t] = (r.position.y - Earth.radius) / 1000.0;
			r.Update();
			r.Update();
		}
		
		return data;
	}

    public boolean action(Event ev, Object arg) {
    	showStatus( "action on: " + (String)arg );
		if (ev.target instanceof Button) {
		    String label = (String)arg;
		    if (label.equals("Compute")) {
				showStatus( "Computing..." );
				mainPanel.setData( generateData() );
				showStatus("Redisplaying...");
				mainPanel.repaint();
		    }
		    return true;
		}
		return false;
	}
	
/*	public void paint( Graphics g ) {
		mainPanel.paint(g);
	}
*/
}