import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.lang.Math.*;
import javax.swing.*;
import javax.swing.event.*;

abstract class AnimeApplet extends JApplet{
  AnimePanel canvas;
  JCheckBox stopCB;
  JSlider speedBar;
  JButton restartButton;
  JPanel animePanel;
  javax.swing.Timer tm;

  double t=0.0;
  double stepT=0.02;

    public void setStepTime(double a) {
	stepT=a;
    }
  
  public void init(){
    Container cont=getContentPane();
    cont.setLayout(new BorderLayout());

    canvas=new AnimePanel();

    tm= new javax.swing.Timer(50,
			      new ActionListener() {
				public void actionPerformed(ActionEvent e){
				  t=t+stepT;
				  repaint();
				}
			      }
			      );

    getRootPane().setDoubleBuffered(true);


    speedBar = new JSlider(0,50,10);
    speedBar.setMajorTickSpacing(10);
    speedBar.setMinorTickSpacing(1);
    speedBar.setPaintTicks(true);
    speedBar.setPaintLabels(true);

    speedBar.addChangeListener(new ChangeListener() {
	public void stateChanged(ChangeEvent e) {
	  int k=speedBar.getValue();
	  if( k==0 ) {
	    tm.stop();
	  } else {
	    tm.setDelay(1000/k);
	    tm.restart();
	  }
	}
      });
	

    stopCB=new JCheckBox("中断");
    restartButton=new JButton("もう一度最初から");

    stopCB.addItemListener(new ItemListener() {
	  public void  itemStateChanged(ItemEvent evt) {
	    if( stopCB.isSelected() ) {
	      tm.stop();
	    } else {
	      tm.start();
	    }
	  }
	});
      
    restartButton.addActionListener(new ActionListener() {
	public void actionPerformed(ActionEvent evt) {
	  t=0;
	  tm.start();
	  stopCB.setSelected(false);
	}
      });     
    
    Label l=new Label("コマ数／秒");

    JPanel animePanelSub=new JPanel();
    animePanelSub.setLayout( new BorderLayout());
    animePanelSub.add(l,BorderLayout.WEST);
    animePanelSub.add(speedBar,BorderLayout.CENTER);


    animePanel = new JPanel();
    animePanel.setLayout( new BorderLayout());
    animePanel.add(stopCB,BorderLayout.WEST);
    animePanel.add(animePanelSub,BorderLayout.CENTER);
    animePanel.add(restartButton,BorderLayout.EAST);
  
    cont.add("Center",canvas);
  }


  private void writeSegment(Graphics g,int i,int y, int ny) {
    if( ny> y) {
      g.fillRect(i,y,1,ny-y);
    } else {
      if( ny==y ) {
	g.fillRect(i,y,1,1);
      } else {
	g.fillRect(i,ny,1,y-ny);
      }
    }	    
  }

  class AnimePanel extends JPanel {
    public void paintComponent(Graphics g){
      writeCanvas(g);
    }
  }

  abstract void writeCanvas(Graphics g);

}