import java.awt.*;

public class Controls extends java.awt.Panel{

// Builds up user interface panel

private Button start,stop;
private Label v;
private TextField vbox;
private Simulation simref;
private ThreeBody appletref;
private DrawSim plot;

// Constructor for Controls

Controls(ThreeBody ref0, Simulation  ref, DrawSim p){

v = new Label("Mass of Jupiter = ");
vbox = new TextField("0.0",6);
start = new Button("Go");
stop = new Button("Pause");

add(start);
add(stop);
add(v);
add(vbox);

setBackground(Color.yellow);
simref=ref;
appletref=ref0;
plot=p;
}


// Watch for button clicks and suspend/resume simulation thread
// accordingly
// also text box stuff

public boolean action(Event evt, Object arg){
double dx;

if(evt.target instanceof Button){
if(arg.equals("Pause")) appletref.runner.suspend();
else if(arg.equals("Go")) appletref.runner.resume();
return true;
}
else if (evt.target instanceof TextField){
dx=(Double.valueOf(vbox.getText().trim())).doubleValue();
simref.setGM_J(dx);
plot.clearScreen();
return true;
}

return false;
}



}