/*
polynomial
*/


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

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

public class poly extends Applet{

    polyAnim anim=null;
    public static Thread animthread;
    public static double a,b;
    public static double x0,y0,x1,y1;
    public static boolean checkFlag;
    int ix0,ix1,iy0,iy1;
    Point pressed;

    Label label9;
    static Button ssButton;
    static nCanvas pic;
    Label label1;
    static TextField bText;
    Label label2;
    static TextField aText;
    Label label3;
    static TextField y0Text;
    Label label4;
    static TextField x0Text;
    Label label5;
    static TextField y1Text;
    Label label6;
    static TextField x1Text;
    static Button resButton;
    Label label7;
    static TextField xCurr;
    Label label8;
    static TextField yCurr;
    static Button resabButton;
    Label label10;
    static Checkbox chkbox;

    public void init()
    {
        setLayout(null);
        
        setSize(605,450);
        setBackground(new Color(0.8F,0.8F,0.8F));
        
        pic = new nCanvas();
        pic.setBounds(159,6,440,440);
        pic.setBackground(new Color(1.0F,1.0F,1.0F));
        pic.addMouseMotionListener(new mmaCanvas());
        pic.addMouseListener(new maCanvas());
        add(pic);
        pic.makeBuffer();
        
        label9 = new Label("x1 = b*x + a - y*y");
        label9.setBounds(12,13,135,22);
        add(label9);
        
        label10 = new Label("y1 = x");
        label10.setBounds(12,33,135,22);
        add(label10);

        label2 = new Label("a");
        label2.setBounds(9,77,30,23);
        add(label2);
        
        aText = new TextField();
        aText.setText("0.95");
        aText.setBounds(40,76,110,24);
        aText.setBackground(new Color(1.0F,1.0F,1.0F));
        add(aText);
        
        label1 = new Label("b");
        label1.setBounds(9,107,30,23);
        add(label1);
        
        bText = new TextField();
        bText.setText("0.49");
        bText.setBounds(40,106,110,24);
        bText.setBackground(new Color(1.0F,1.0F,1.0F));
        add(bText);
        
        label4 = new Label("x0");
        label4.setBounds(9,217,30,23);
        add(label4);
        
        x0Text = new TextField();
        x0Text.setText("-1.0");
        x0Text.setBounds(40,216,110,24);
        x0Text.setBackground(new Color(1.0F,1.0F,1.0F));
        add(x0Text);
        
        label3 = new Label("y0");
        label3.setBounds(9,247,30,23);
        add(label3);
        
        y0Text = new TextField();
        y0Text.setText("-1.0");
        y0Text.setBounds(40,246,110,24);
        y0Text.setBackground(new Color(1.0F,1.0F,1.0F));
        add(y0Text);
        
        label6 = new Label("x1");
        label6.setBounds(9,277,30,23);
        add(label6);
        
        x1Text = new TextField();
        x1Text.setText("2.0");
        x1Text.setBounds(40,276,110,24);
        x1Text.setBackground(new Color(1.0F,1.0F,1.0F));
        add(x1Text);

        label5 = new Label("y1");
        label5.setBounds(9,307,30,23);
        add(label5);
        
        y1Text = new TextField();
        y1Text.setText("2.0");
        y1Text.setBounds(40,306,110,24);
        y1Text.setBackground(new Color(1.0F,1.0F,1.0F));
        add(y1Text);
                
        ssButton = new Button();
        ssButton.setLabel("start");
        ssButton.setBounds(37,139,83,28);
        ssButton.setForeground(new Color(0));
        ssButton.setBackground(new Color(1.0F,1.0F,1.0F));
        ssButton.addMouseListener(new maButton());
        add(ssButton);
        
        resabButton = new Button();
        resabButton.setLabel("Reset a,b");
        resabButton.setBounds(45,178,75,19);
        resabButton.setForeground(new Color(0));
        resabButton.setBackground(new Color(1.0F,1.0F,1.0F));
        resabButton.addMouseListener(new maButton());
        add(resabButton);
        
        resButton = new Button();
        resButton.setLabel("Reset x,y");
        resButton.setBounds(45,338,75,19);
        resButton.setForeground(new Color(0));
        resButton.setBackground(new Color(1.0F,1.0F,1.0F));
        resButton.addMouseListener(new maButton());
        add(resButton);
        
        label7 = new Label("x");
        label7.setBounds(9,377,30,23);
        add(label7);
        
        xCurr = new TextField();
        xCurr.setBounds(40,376,110,24);
        xCurr.setBackground(new Color(1.0F,1.0F,1.0F));
        add(xCurr);
        
        label8 = new Label("y");
        label8.setBounds(9,402,30,24);
        add(label8);
        
        yCurr = new TextField();
        yCurr.setBounds(40,402,110,24);
        yCurr.setBackground(new Color(1.0F,1.0F,1.0F));
        add(yCurr);
        
        chkbox = new Checkbox("Out of Range");
        chkbox.setBounds(9,428,140,22);
        chkbox.addItemListener(new chkBox());
        add(chkbox);
      
        getNumbers();
        
    }
    
    
    // MouseAdapter for button
    class maButton extends MouseAdapter{
        public void mouseClicked(MouseEvent e){
            Object object = e.getSource();
            if(object == ssButton) ssButton_Clicked();
            if(object == resButton) resButton_Clicked();
            if(object == resabButton) resabButton_Clicked();
            }
        }
    
    void ssButton_Clicked() {
        if(ssButton.getLabel()=="start"){
            anim=new polyAnim();
            anim.myStart();
        } else {
            anim.myStop();
        }
    }

    void resButton_Clicked(){
        if((anim!=null) && anim.isAlive()) anim.myStop();
        x0Text.setText("-1.0");
        y0Text.setText("-1.0");
        x1Text.setText("2.0");
        y1Text.setText("2.0");
        getNumbers();
    }
        
    void resabButton_Clicked(){
        if((anim!=null) && anim.isAlive()) anim.myStop();
        aText.setText("0.95");
        bText.setText("0.49");
        getNumbers();
    }
    
    // MouseAdapter for Canvas
    class maCanvas extends MouseAdapter{
        public void mousePressed(MouseEvent e){
            pic_MousePressed(e);
        }
        
        public void mouseReleased(MouseEvent e){
            pic_MouseReleased(e);
        }
    }

    void pic_MousePressed(MouseEvent event) {
        if(anim.isAlive()) anim.myStop();
        pressed=event.getPoint();
    }

    void pic_MouseReleased(MouseEvent event) {
        Dimension ps = pic.getSize();
        Point p0=pressed;
        Point p1=event.getPoint();
        int tmp;
        
        if(p0.x > p1.x){ tmp=p0.x; p0.x=p1.x; p1.x=tmp;};
        if(p0.y < p1.y){ tmp=p0.y; p0.y=p1.y; p1.y=tmp;};
        
        if((p0.x != p1.x) && (p0.y != p1.y)){
            //Set pressed point to (x0,y0)
            x0Text.setText(Double.toString(x0 + ((double)p0.x)/((double)ps.width)*(x1-x0)));
            y0Text.setText(Double.toString(y1 - ((double)p0.y)/((double)ps.height)*(y1-y0)));
            
            //Set released point to (x1,y1)
            x1Text.setText(Double.toString(x0+((double)p1.x)/((double)ps.width)*(x1-x0)));
            y1Text.setText(Double.toString(y1-((double)p1.y)/((double)ps.height)*(y1-y0)));
        }
    }

    
    //MouseMotionAdapter for Canvas
    class mmaCanvas extends MouseMotionAdapter{
        public void mouseMoved(MouseEvent e){
            pic_MouseMoved(e);
        }

        public void mouseDragged(MouseEvent e){
            pic_MouseDragged(e);
        }

    }
    
    void pic_MouseMoved(MouseEvent event){
        Dimension ps = pic.getSize();
        Point tmp=event.getPoint();

        xCurr.setText(Double.toString(x0 + ((double)tmp.x)/((double)ps.width)*(x1-x0)));
        yCurr.setText(Double.toString(y1 - ((double)tmp.y)/((double)ps.height)*(y1-y0)));
    }

    void pic_MouseDragged(MouseEvent event) {
        Dimension ps;
        int tx0,tx1,ty0,ty1,tmp; //temporary variables

        tx0=pressed.x; ty0=pressed.y;

        tx1=event.getX();
        ty1=event.getY();
        
        if(tx0>tx1){tmp=tx0; tx0=tx1; tx1=tmp; }
        if(ty0>ty1){tmp=ty0; ty0=ty1; ty1=tmp; }
        
        if((tx0!=tx1) && (ty0!=ty1)){
            Graphics gtmp;
            
            pic.repaint();
            gtmp=pic.getGraphics();
            gtmp.setColor(new Color(1.0F,0.0F,0.0F));
            gtmp.drawRect(tx0,ty0,tx1-tx0,ty1-ty0);
        }
    }

    // MouseAdapter for checkbox
    class chkBox implements ItemListener{
        public void itemStateChanged(ItemEvent e){
            if(e.getStateChange()==ItemEvent.SELECTED){
                checkFlag=true;
            }else{
                checkFlag=false;
            }
        }
    }


    //////////////////////////////////////////////////////////
    // Get numbers
    static void getNumbers(){
        
        try{
            a=Double.valueOf(aText.getText()).doubleValue();
        }catch(NumberFormatException e){
            aText.setText("0.95");
            a=0.95;
        };
        
        try{
            b=Double.valueOf(bText.getText()).doubleValue();
        }catch(NumberFormatException e){
            bText.setText("0.49");
            b=0.49;
        };

        try{
            x0=Double.valueOf(x0Text.getText()).doubleValue();
        }catch(NumberFormatException e){
            x0Text.setText("-1.0");
            x0=-1.0;
        };

        try{
            y0=Double.valueOf(y0Text.getText()).doubleValue();
        }catch(NumberFormatException e){
            y0Text.setText("-1.0");
            y0=-1.0;
        };

        try{
            x1=Double.valueOf(x1Text.getText()).doubleValue();
        }catch(NumberFormatException e){
            x1Text.setText("2.0");
            x1=2.0;
        };

        try{
            y1=Double.valueOf(y1Text.getText()).doubleValue();
        }catch(NumberFormatException e){
            y1Text.setText("2.0");
            y1=2.0;
        };
        
    }
}