import java.awt.*;
import java.awt.event.*;
import java.applet.*;

abstract public class DisperseGUI extends PhysicsApplet{

    int N2;
    double[] fi, ficos, fisin;
    FourierTransform FT;
    double[] fzero;
    double t;
    CurveDisplay Waveform;
    TitleBanner Legend;
        // mouse modes
    static final int NormalMode = 0;
    static final int DrawWaveMode = 1;
       // button codes
    static final int FinishDrawingCode = 1;
    static final int StartCode = 2;
    static final int StopCode = 3;
    static final int ResetCode = 4;
    static final int ResetAllCode = 40;
    static final int ScrollbarCode = 5;
       // scrollbar
    PhysicsScrollbar StepBar;
    BoldLabel StepLabel;
    double tstep;

    DisperseGUI(){
	super("Wave Equation with Dispersion", 299, 100, 2, 40);
        N2 = (Nx+1)/2;
        fi = new double[Nx+1];
        ficos = new double[N2+1];
        fisin = new double[N2+1];
        fzero = new double[Nx+1];
        FT = new FourierTransform(Nx+1);
        for (int i = 0; i <= Nx ; i++){
	    fi[i] = 0.0; 
        }
        for (int i = 0; i <= N2 ; i++){
	    ficos[i] = 0.0; 
            fisin[i] = 0.0;
        }
        t = 0;
    }
          
    void resetArrays(){
        for (int i = 0; i <= N2 ; i++){
            FT.fcos[i] = ficos[i];
            FT.fsin[i] = fisin[i];
        }
        FT.InverseTransform();
        t = 0;
        refreshPicture();
    }
        
    void resetAll(){
        for (int i = 0; i <= Nx ; i++){
	    fi[i] = 0.0; 
            fzero[i] = 0.0;
        }
        for (int i = 0; i <= N2 ; i++){
	    ficos[i] = 0.0; 
            fisin[i] = 0.0;
        }
        t = 0;
        refreshPicture();
    }

    void buildPicture(){
        inputWave();
        for (int i = 0; i < Nx ; i++){
	    FT.f[i] = fi[i];
        }
        FT.Transform();
        for (int i = 0; i <= N2 ; i++){
            ficos[i] = FT.fcos[i];
            fisin[i] = FT.fsin[i];
        }
        Waveform = new CurveDisplay(150, 75, FT.f, fzero, 1.5, 1.0,
                                  Color.blue, Color.black,DrawWaveMode);
   	Picture.add(Waveform,"Center");
        Legend = new TitleBanner(" ",16);
        Picture.add(Legend,"South");
    }

    void refreshPicture(){
        Waveform.refresh();
        Legend.write(" "+t);
    }


    void buildControls(){
        Controls.setLayout(new GridLayout(0,5, 10, 10));
        ModeButton B1 = new ModeButton("Draw f", DrawWaveMode);
        Controls.add(B1);
        CommandButton B2 = new CommandButton("Finish drawing",
                                                           FinishDrawingCode);
        Controls.add(B2);
        CommandButton B3 = new CommandButton("Solve", StartCode);
        Controls.add(B3);
        CommandButton B4 = new CommandButton("Stop", StopCode);
        Controls.add(B4);
        CommandButton B4a = new CommandButton(" Reset to t= 0 ", ResetCode);
        Controls.add(B4a);
        BoldLabel B5 = new BoldLabel("       Time Step: ");
        Controls.add(B5);
        StepBar = new PhysicsScrollbar(0.3, 0.1, 3.0,ScrollbarCode);
        Controls.add(StepBar);
        StepLabel = new BoldLabel("    0.3");
        Controls.add(StepLabel);
        tstep = 0.3;
        CommandButton B8 = new CommandButton("Reset All", ResetAllCode);
        Controls.add(B8);
    }

    void doAction(int Code){
        switch(Code){
	  case FinishDrawingCode:
              FT.Transform();
              for (int i = 0; i <= N2 ; i++){
                 ficos[i] = FT.fcos[i];
                 fisin[i] = FT.fsin[i];
              }
	      refreshPicture();
              break;
          case StartCode:
              startThread();
              break;
          case StopCode:
              stopThread();
              break;
	  case ResetCode:
              resetArrays();
              break;
	  case ResetAllCode:
              resetAll();
              break;
	  case ScrollbarCode:
              tstep =  StepBar.getReading();
              StepLabel.setText("      "+tstep);
              break;
	  default:
              break;
        }
    }

    Color findColor(double A, int S){ return Color.black; }
    void writeFieldValue(double Val, int mode){}
    void writeVectorValue(double Vx, double Vy, int mode){}
    void setArrays(int i, int j, int mode){}

    abstract void inputWave();
}