import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.awt.Graphics;
import java.awt.Font;
import java.awt.event.*;

public class RainbowCanvas extends Frame {


	Image offScreen = null;

	Frame f;
	RainbowPanel rainbowPanel;
	Panel panel;

	public RainbowCanvas() {
	
	f = new Frame("RainbowCanvas");
	f.setLayout(new FlowLayout());
	rainbowPanel = new RainbowPanel();
	panel = new Panel();
	panel.add(rainbowPanel);

	f.addWindowListener(new WindowAdapter() {
	public void windowClosing(WindowEvent event) {
			Frame frm = (Frame)event.getSource();
			frm.setVisible(false);
			rainbowPanel.killRainbowTextThread();
			frm.dispose();
			System.out.println("Rainbow Text closed");
			}
		});

	f.add(panel);
	f.setSize(600,600);	
	f.pack();
	f.show();	
	}


}//End of Class 



class RainbowPanel extends Panel implements ActionListener,TextListener,ItemListener {

	QuickLabelPanel panel;
	Panel panel2;
	RainbowText canvas;
	Label textInputLabel,fontLabel,fontStyleLabel,fontSizeLabel;
	Label backgroundColorLabel,speedLabel,outputLabel;
	Choice fontChoice,fontStyleChoice,fontSizeChoice,backgroundColorChoice;
	TextField inputTextfield,speedTextfield,outputTextfield;
	Button stop,start,save;
	FileDialog dialog;

	public RainbowPanel() {
	
	setLayout(new BorderLayout(2,2));
	
	panel = new QuickLabelPanel("Rainbow Text");
	GridBagLayout gridbag = new GridBagLayout();
	GridBagConstraints c = new GridBagConstraints();
	panel.setLayout(gridbag);
	c.insets = new Insets(2,5,2,5);

	// Input String Label
	c.gridx = 1;
	c.gridy = 1;
	c.gridwidth = 1;
	c.gridheight = 1;
	c.anchor = GridBagConstraints.SOUTHWEST;
	c.fill = GridBagConstraints.HORIZONTAL;
	c.weightx = 1.0;
	c.weighty = 0.0;
	textInputLabel = new Label("Input String:");
	gridbag.setConstraints(textInputLabel,c);
	panel.add(textInputLabel);

	
	//Input String
	c.gridx = 1;
	c.gridy = 2;
	c.gridwidth = 5;
	c.gridheight = 1;
	c.anchor = GridBagConstraints.SOUTHWEST;
	c.fill = GridBagConstraints.HORIZONTAL;
	c.weightx = 1.0;
	c.weighty = 0.0;
	inputTextfield = new TextField("Hello... Gifin ^_^");
	inputTextfield.addTextListener(this);	
	gridbag.setConstraints(inputTextfield,c);
	panel.add(inputTextfield);
	
	// Font Label
	c.gridx = 1;
	c.gridy = 3;
	c.gridwidth = 1;
	c.gridheight = 1;
	c.anchor = GridBagConstraints.SOUTHWEST;
	c.fill = GridBagConstraints.HORIZONTAL;
	c.weightx = 1.0;
	c.weighty = 0.0;
	fontLabel = new Label("Font:");
	gridbag.setConstraints(fontLabel,c);
	panel.add(fontLabel);

	//Font Choice
	c.gridx = 1;
	c.gridy = 4;
	c.gridwidth = 3;
	c.gridheight = 1;
	c.anchor = GridBagConstraints.NORTHWEST;
	c.fill = GridBagConstraints.HORIZONTAL;
	c.weightx = 1.0;
	c.weighty = 0.0;
	fontChoice = new Choice();
	{ String fontNames[] = getToolkit().getFontList();
		for (int i=0; i < fontNames.length; ++i)
			fontChoice.add(fontNames[i]);
	}
	fontChoice.setBackground(Color.white);
	gridbag.setConstraints(fontChoice,c);
	fontChoice.addItemListener(this);
	panel.add(fontChoice);

	// Font Style Label
	c.gridx = 4;
	c.gridy = 3;
	c.gridwidth = 1;
	c.gridheight = 1;
	c.anchor = GridBagConstraints.SOUTHWEST;
	c.fill = GridBagConstraints.HORIZONTAL;
	c.weightx = 1.0;
	c.weighty = 0.0;
	fontStyleLabel = new Label("Style:");
	gridbag.setConstraints(fontStyleLabel,c);
	panel.add(fontStyleLabel);

	//Font Style Choice
	c.gridx = 4;
	c.gridy = 4;
	c.gridwidth = 1;
	c.gridheight = 1;
	c.anchor = GridBagConstraints.NORTHWEST;
	c.fill = GridBagConstraints.HORIZONTAL;
	c.weightx = 1.0;
	c.weighty = 0.0;
	fontStyleChoice = new Choice();
	fontStyleChoice.add("Plain");
	fontStyleChoice.add("Bold");
	fontStyleChoice.add("Italic");
	fontStyleChoice.add("Bold & Italic");
	fontStyleChoice.setBackground(Color.white);
	gridbag.setConstraints(fontStyleChoice,c);
	fontStyleChoice.addItemListener(this);
	panel.add(fontStyleChoice);

	// Font Size Label
	c.gridx = 5;
	c.gridy = 3;
	c.gridwidth = 1;
	c.gridheight = 1;
	c.anchor = GridBagConstraints.SOUTHWEST;
	c.fill = GridBagConstraints.HORIZONTAL;
	c.weightx = 1.0;
	c.weighty = 0.0;
	fontSizeLabel = new Label("Size:");
	gridbag.setConstraints(fontSizeLabel,c);
	panel.add(fontSizeLabel);

	//Font Size Choice
	c.gridx = 5;
	c.gridy = 4;
	c.gridwidth = 1;
	c.gridheight = 1;
	c.anchor = GridBagConstraints.NORTHWEST;
	c.fill = GridBagConstraints.HORIZONTAL;
	c.weightx = 1.0;
	c.weighty = 0.0;
	fontSizeChoice = new Choice();
	fontSizeChoice.add("12");
	fontSizeChoice.add("14");
	fontSizeChoice.add("16");
	fontSizeChoice.add("18");
	fontSizeChoice.add("24");
	fontSizeChoice.add("36");
	fontSizeChoice.setBackground(Color.white);
	gridbag.setConstraints(fontSizeChoice,c);
	fontSizeChoice.addItemListener(this);
	panel.add(fontSizeChoice);

	// Background Color Label
	c.gridx = 1;
	c.gridy = 5;
	c.gridwidth = 1;
	c.gridheight = 1;
	c.anchor = GridBagConstraints.SOUTHWEST;
	c.fill = GridBagConstraints.HORIZONTAL;
	c.weightx = 1.0;
	c.weighty = 0.0;
	backgroundColorLabel = new Label("Background Color:");
	gridbag.setConstraints(backgroundColorLabel,c);
	panel.add(backgroundColorLabel);

	// Background Color Choice
	c.gridx = 1;
	c.gridy = 6;
	c.gridwidth = 1;
	c.gridheight = 1;
	c.anchor = GridBagConstraints.NORTHWEST;
	c.fill = GridBagConstraints.NONE;//HORIZONTAL;
	c.weightx = 1.0;
	c.weighty = 0.0;
	backgroundColorChoice = new Choice();
	backgroundColorChoice.add("Black");
	backgroundColorChoice.add("Blue");
	backgroundColorChoice.add("Cyan");
	backgroundColorChoice.add("Dark Gray");
	backgroundColorChoice.add("Gray");
	backgroundColorChoice.add("Green");
	backgroundColorChoice.add("Light Gray");
	backgroundColorChoice.add("Magenta");
	backgroundColorChoice.add("Orange");
	backgroundColorChoice.add("Pink");
	backgroundColorChoice.add("Red");
	backgroundColorChoice.add("White");
	backgroundColorChoice.add("Yellow");
	backgroundColorChoice.setBackground(Color.white);
	gridbag.setConstraints(backgroundColorChoice,c);
	backgroundColorChoice.addItemListener(this);
	panel.add(backgroundColorChoice);

	// Speed Label
	c.gridx = 4;
	c.gridy = 5;
	c.gridwidth = 1;
	c.gridheight = 1;
	c.anchor = GridBagConstraints.SOUTHWEST;
	c.fill = GridBagConstraints.HORIZONTAL;
	c.weightx = 1.0;
	c.weighty = 0.0;
	speedLabel = new Label("Speed: ms");
	gridbag.setConstraints(speedLabel,c);
	panel.add(speedLabel);

	
	// Speed String
	c.gridx = 4;
	c.gridy = 6;
	c.gridwidth = 5;
	c.gridheight = 1;
	c.anchor = GridBagConstraints.SOUTHWEST;
	c.fill = GridBagConstraints.NONE;
	c.weightx = 1.0;
	c.weighty = 0.0;
	speedTextfield = new TextField("100");
	gridbag.setConstraints(speedTextfield,c);
	//speedTextfield.setEditable(false);
	speedTextfield.addTextListener(this);
	panel.add(speedTextfield);

	//Start Button
	c.gridx = 4;
	c.gridy = 6;
	c.gridwidth = 4;
	c.gridheight = 1;
	c.anchor = GridBagConstraints.CENTER;
	c.fill = GridBagConstraints.NONE;//HORIZONTAL;
	c.weightx = 1.0;
	c.weighty = 0.0;
	start = new Button("Start");
	start.addActionListener(this);
	gridbag.setConstraints(start,c);
	panel.add(start);

	// Stop Button
	c.gridx = 5;
	c.gridy = 6;
	c.gridwidth = 4;
	c.gridheight = 1;
	c.anchor = GridBagConstraints.CENTER;
	c.fill = GridBagConstraints.NONE;//HORIZONTAL;
	c.weightx = 1.0;
	c.weighty = 0.0;
	stop = new Button("Stop");
	stop.addActionListener(this);
	gridbag.setConstraints(stop,c);
	panel.add(stop);

	// Output file Label
	c.gridx = 1;
	c.gridy = 7;
	c.gridwidth = 1;
	c.gridheight = 1;
	c.anchor = GridBagConstraints.SOUTHWEST;
	c.fill = GridBagConstraints.HORIZONTAL;
	c.weightx = 1.0;
	c.weighty = 0.0;
	outputLabel = new Label("Output file:");
	gridbag.setConstraints(outputLabel,c);
	panel.add(outputLabel);

	
	//Output file Textfield
	c.gridx = 1;
	c.gridy = 8;
	c.gridwidth = 4;
	c.gridheight = 1;
	c.anchor = GridBagConstraints.SOUTHWEST;
	c.fill = GridBagConstraints.HORIZONTAL;
	c.weightx = 1.0;
	c.weighty = 0.0;
	outputTextfield = new TextField("Gifin.gif");
	gridbag.setConstraints(outputTextfield,c);
	panel.add(outputTextfield);
	
	//Save Button
	c.gridx = 5;
	c.gridy = 8;
	c.gridwidth = 1;
	c.gridheight = 1;
	c.anchor = GridBagConstraints.WEST;
	c.fill = GridBagConstraints.NONE;
	c.weightx = 1.0;
	c.weighty = 0.0;
	save = new Button("Save...");
	save.addActionListener(this);
	gridbag.setConstraints(save,c);
	panel.add(save);


	//Canvas for RainbowText
	canvas = new RainbowText();
	panel2 = new Panel();
	panel2.add(canvas);
	System.out.println("Pass RainbowText Constructor");
	add(panel,"North");

	add(panel2,"South");
	canvas.start();
	
	}

	public void killRainbowTextThread() {

		this.canvas.stop();

	}

	public void actionPerformed(ActionEvent buttonClick) {
    if (buttonClick.getSource() == start)
		{ canvas.start();
		  System.out.print("Rainbow Canvas start\n");
		}
    if (buttonClick.getSource() == stop)
		{ canvas.stop(); 
		  System.out.print("Rainbow Canvas stop\n");
		}
	if (buttonClick.getSource() == save)
		{
		try {

			Frame frameDialog = new Frame();
			dialog = new FileDialog(frameDialog,"Save As",FileDialog.SAVE);
		
		dialog.setFile("*.gif");
		dialog.show();
		String filename = dialog.getDirectory() + dialog.getFile();
		//System.out.println("Filename result =" + filename);
		if ((dialog.getFile()) != null ) {
		outputTextfield.setText(filename);
		canvas.setFilename(filename);
		canvas.setFlagGenerate(true,true);
		}
		else {}
		//System.out.println("Get save button event");
		}catch (Exception e) { System.out.println("IOException thrown:\n" + e); } 
		}
	else {}

	}//End of actonPerformed

	
	public void itemStateChanged(ItemEvent event) {

	
		if((fontChoice == event.getItemSelectable()) || (fontStyleChoice == event.getItemSelectable())|| (fontSizeChoice == event.getItemSelectable())) {
			canvas.setFont(fontChoice.getSelectedItem(),fontStyleChoice.getSelectedIndex(),Integer.parseInt(fontSizeChoice.getSelectedItem()));
			//System.out.println("Get fontChoice Event");
			System.out.println("Font Value =" + Integer.parseInt(fontSizeChoice.getSelectedItem()) );
			}
		else if (backgroundColorChoice == event.getItemSelectable()) {

			canvas.setBackgroundColor(backgroundColorChoice.getSelectedIndex());
			//System.out.println("Color Index =" + backgroundColorChoice.getSelectedIndex());
		}

		else {}

	}//End of itemStateChanged



	public void textValueChanged(TextEvent event) {
		
		if(inputTextfield == event.getSource()) {
		TextComponent tc = (TextComponent)event.getSource();
        String str = tc.getText();
		canvas.setStringInput(str);
		//System.out.println("Get stringTextfield event");
		}

		else if (speedTextfield == event.getSource()) {
			try {
		TextComponent tc = (TextComponent)event.getSource();
        String str = tc.getText();
		if ( str == null) canvas.setSleepTime(100);
		else 
		canvas.setSleepTime(Integer.parseInt(str));
		System.out.println("Change speed to " + Integer.parseInt(str) + " ms");
			} catch (Exception e) { } 
		}

		else {}

	}//End of textValueChanged


}//End of Class



class RainbowText extends Canvas implements Runnable {

  Thread runner = null;
  Font f;
  FontMetrics fm;
  String textStr = null;
  String fontName;
  int fontStyle;
  int fontSize;
  int sleepTime;
  int strlen;
  int charOffsets[];
  int yOffset;
  int phase = 0;
  char theChars[];
  Color bgColor;
  Color colors[];
  String fileName = "Gifin.gif";
  boolean blockFlag = false;
  boolean fileFlag = false;
  int imageCount = 1;

  Image offScreen = null;
  Graphics offScreenG;
  OutputStream output;

  boolean stopped = false;
  
 
  public RainbowText() {
	

    bgColor = Color.black;
 
	setBackground(bgColor);
   
	textStr = "Hello... Gifin ^_^";
   
	fontName = "TimesRoman";
   
    fontStyle = Font.PLAIN;
    
	fontSize = 36;
    
    sleepTime = 100;
       
    f=new Font(fontName,fontStyle,fontSize);
    fm=getFontMetrics(f);
    setSize(40+fm.stringWidth(textStr),10+fm.getHeight());

  }//End of Constructor


	public void update(Graphics g) {

	float h;
	int xPos=20;
    int x, y;

    phase--;
    if (phase < 0)
      phase=strlen-1;

	//System.out.println("Width =" + this.getSize().width + "Height =" + this.getSize().height);
	f=new Font(fontName,fontStyle,fontSize);
    fm=getFontMetrics(f);
    setSize(40+fm.stringWidth(textStr),10+fm.getHeight());
    yOffset = fm.getAscent()+5;
    strlen = textStr.length();
    theChars =  new char [strlen];
    charOffsets = new int [strlen];
    textStr.getChars(0,strlen,theChars,0);
    colors = new Color[strlen];
    for (int i = 0; i < strlen; i++) {
      h = ((float)i)/((float)strlen);
      colors[i] = new Color(Color.HSBtoRGB(h,1.0f,1.0f));
      charOffsets[i] = xPos;
      xPos+=fm.charWidth(theChars[i]);
    }

    offScreen = createImage(this.getSize().width,this.getSize().height);
    offScreenG = offScreen.getGraphics();
    offScreenG.setColor(bgColor);
    offScreenG.fillRect(0,0,this.getSize().width,this.getSize().height);
    offScreenG.setFont(f);

    for(int i=0;i<strlen;i++)
     {
       x = charOffsets[i];
       offScreenG.setColor(colors[(phase+i)%strlen]);
       offScreenG.drawChars(theChars,i,1,x,yOffset);
     }
	paint(offScreenG);	
    paint(g);
	
	//Add save file to Gif89a here!!!
	if (blockFlag) {

		try {

			if (fileFlag) {
		output = new BufferedOutputStream(new FileOutputStream(fileName));
		imageCount = 1;
		fileFlag = false;
			}

	// encode the image using GIF format
			if ((imageCount)<= textStr.length()) {		 //18 frames
		GIF89aEncoderBlock encode = new GIF89aEncoderBlock(offScreen,imageCount);
		encode.Write(output);
		imageCount++;
			if (imageCount == (textStr.length()+1)) {	 //19 frames
	GIF89aEncoderBlock.WriteCommentEnd(output,"Gif89aEncoder by Keng, EE Dept.Columbia University");
				output.close();
				System.out.println("Writing to Gif file complete");
				blockFlag = false; }
			}

		}catch (Exception e) { System.out.println("IOException thrown:\n" + e); } 

	}//End of if(blockFlag)

	g.drawImage(offScreen,0,0,this);
  }


	public void setStringInput(String str) {
		
		this.textStr = str;

	}

	public void setFont(String fontName,int fontStyle,int fontSize) {
		
		this.fontName = fontName;
		this.fontStyle = fontStyle;
		this.fontSize = fontSize;
	
	}


	public void setBackgroundColor(int index) {
	
		switch(index) {

		case 0:	 this.bgColor = Color.black;	break;
		case 1:  this.bgColor = Color.blue;		break;
		case 2:  this.bgColor = Color.cyan;		break;
		case 3:  this.bgColor = Color.darkGray;	break;
		case 4:  this.bgColor = Color.gray;		break;
		case 5:  this.bgColor = Color.green;    break;
		case 6:  this.bgColor = Color.lightGray;break;
		case 7:  this.bgColor = Color.magenta;	break;
		case 8:  this.bgColor = Color.orange;	break;
		case 9:  this.bgColor = Color.pink;		break;
		case 10: this.bgColor = Color.red;		break;
		case 11: this.bgColor = Color.white;	break;
		case 12: this.bgColor = Color.yellow;	break;
		
		}
	}

	public void setSleepTime(int sleepTime) {

		this.sleepTime = sleepTime;

	}


	public void setFilename(String str) {

		this.fileName = str;

	}

	public void setFlagGenerate(boolean blockFlag,boolean fileFlag) {

		this.blockFlag = blockFlag;
		this.fileFlag = fileFlag;

	}


  public void paint(Graphics g) {
    // g.drawImage(offScreen,0,0,this);
  }


  public void start() {
	
    if(runner == null) {
      runner = new Thread(this);
      runner.start();
    }
 }


  public void stop() {
    if (runner != null && runner.isAlive())
      runner.stop();
    runner = null;
  }


  public void run() {
      while (runner != null) {
		  repaint();
	System.out.println("RainbowText running");
	  try {
	    Thread.sleep(sleepTime);
	  }
	  catch (InterruptedException e) { }
    }
  }

  public Dimension getPreferredSize() {
	  return new Dimension(this.getSize().width,this.getSize().height);
  }

}//End of RainbowText class