JitterText
/* JitterText
revised by W.Giel 2 Mar 96
Revised init(), revised paint(),added update() w/buffered image,
added color and speed params, added code to optimize font height.
revised by W.Giel 8 Mar 96
Added random colors
based on NervousText Applet
by Daniel Wyszynski
Center for Applied Large-Scale Computing (CALC)
04-12-95
revised by kwalrath 5-9-95
Parameters: TEXTCOLOR - string - Hex RGB triplet - default: #000000 (black)
BGCOLOR - string - Hex RGB triplet - default: #C0C0C0 (light gray)
TEXT - string - message - degault: "Java Power!"
SPEED - int - delay in millisecond - default: 200
RANDOMCOLOR - int - non-zero=true;
*/
import java.awt.*;
import java.applet.*;
import java.lang.*;
public class JitterText extends java.applet.Applet implements Runnable
{
static final int MAXCLORS=10;
String s = null;
Thread jitterThread = null;
boolean threadSuspended = false; //added by kwalrath
////////////////////
// Added by W.Giel
////////////////////
int fontHeight;
Color textColor=null;
Color bgColor;
int speed=200;
FontMetrics fm;
int baseline;
Image offScrImage;
Graphics offScrGC;
boolean normal=false;
Font font;
Color randomColors[]=new Color[10];
boolean randomColor=false;
/////////////////////
// Revised by W.Giel
/////////////////////
public void init()
{
String param;
Graphics g=getGraphics();
fontHeight=size().height - 10;
offScrImage = createImage(size().width,size().height);
offScrGC = offScrImage.getGraphics();
s = getParameter("text");
if (s == null) s = "Java Power!";
int maxlen=size().width - (s.length()+1)* 5 - 10;
do{
g.setFont(new Font("TimesRoman",Font.BOLD,fontHeight));
fm=g.getFontMetrics();
if(fm.stringWidth(s)>maxlen)fontHeight--;
}while(fm.stringWidth(s)>maxlen);
baseline= size().height - fm.getMaxDescent();
font=new Font("TimesRoman",Font.BOLD,fontHeight);
if(null == (param=getParameter("TEXTCOLOR")))
textColor=Color.black;
else textColor=parseColorString(param);
if(null == (param=getParameter("BGCOLOR")))
bgColor=Color.lightGray;
else bgColor=parseColorString(param);
setBackground(bgColor);
if(null != (param=getParameter("SPEED")))
speed=Integer.valueOf(param).intValue();
if(0 == speed)speed=200;
if(null != (param=getParameter("RANDOMCOLOR")))
randomColor=(0==Integer.valueOf(param).intValue())? false : true;
randomColors[0]=Color.magenta;
randomColors[1]=Color.orange;
randomColors[2]=Color.red;
randomColors[3]=Color.white;
randomColors[4]=Color.yellow;
randomColors[5]=Color.blue;
randomColors[6]=Color.cyan;
randomColors[7]=Color.green;
randomColors[8]=Color.pink;
randomColors[9]=Color.gray;
jitterThread=new Thread(this);
}
public void start()
{
if(null != jitterThread) jitterThread.start();
}
public void stop()
{
if(null != jitterThread) jitterThread.stop();
jitterThread = null;
}
public void run()
{
while (jitterThread != null) {
try {Thread.sleep(200);} catch (InterruptedException e){}
repaint();
}
System.exit(0);
}
public boolean mouseDown(java.awt.Event evt, int x, int y)
{
if (threadSuspended) {
jitterThread.resume();
normal=false;
}
else {
normal=true;
repaint();
jitterThread.suspend();
}
threadSuspended = !threadSuspended;
return true;
}
///////////////////
// Added by W.Giel
///////////////////
public void paint(Graphics g)
{
if(normal){
g.setColor(bgColor);
g.fillRect(0,0,size().width,size().height);
g.setColor(textColor);
g.setFont(font);
g.drawString(s,(size().width-fm.stringWidth(s))/2, baseline);
}
}
public void update(Graphics g)
{
Color color;
offScrGC.setColor(bgColor);
offScrGC.fillRect(0,0,size().width,size().height);
offScrGC.setColor(textColor);
offScrGC.setFont(font);
if(!normal){
int x_coord=0;
for(int i=0;i<s.length();i++){
if(randomColor){
while(bgColor==(color=randomColors[Math.min(9,(int)(Math.random()*10))]));
offScrGC.setColor(color);
}
x_coord += (int)(Math.random()*10);
int y_coord = baseline - (int)(Math.random()*10);
String substr=s.substring(i,i+1);
offScrGC.drawString(substr,x_coord,y_coord);
x_coord += fm.stringWidth(substr);
}
}
else offScrGC.drawString(s,(size().width-fm.stringWidth(s))/2, baseline);
g.drawImage(offScrImage,0,0,this);
}
private Color parseColorString(String colorString)
{
if(colorString.length()==6){
int R = Integer.valueOf(colorString.substring(0,2),16).intValue();
int G = Integer.valueOf(colorString.substring(2,4),16).intValue();
int B = Integer.valueOf(colorString.substring(4,6),16).intValue();
return new Color(R,G,B);
}
else return Color.lightGray;
}
}
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