Blinkpublic class Blink extends Applet
| Fields Summary |
|---|
| private Timer | timer | | private String | labelString | | private int | delay |
| Methods Summary |
|---|
| public java.lang.String | getAppletInfo()
return "Title: Blinker\n"
+ "Author: Arthur van Hoff\n"
+ "Displays multicolored blinking text.";
| | public java.lang.String[][] | getParameterInfo()
String pinfo[][] = {
{"speed", "string", "The blink frequency"},
{"lbl", "string", "The text to blink."},
};
return pinfo;
| | public void | init()
String blinkFrequency = getParameter("speed");
delay = (blinkFrequency == null) ? 400 :
(1000 / Integer.parseInt(blinkFrequency));
labelString = getParameter("lbl");
if (labelString == null)
labelString = "Blink";
Font font = new java.awt.Font("Serif", Font.PLAIN, 24);
setFont(font);
| | public void | paint(java.awt.Graphics g)
int fontSize = g.getFont().getSize();
int x = 0, y = fontSize, space;
int red = (int) ( 50 * Math.random());
int green = (int) ( 50 * Math.random());
int blue = (int) (256 * Math.random());
Dimension d = getSize();
g.setColor(Color.black);
FontMetrics fm = g.getFontMetrics();
space = fm.stringWidth(" ");
for (StringTokenizer t = new StringTokenizer(labelString);
t.hasMoreTokens();) {
String word = t.nextToken();
int w = fm.stringWidth(word) + space;
if (x + w > d.width) {
x = 0;
y += fontSize; //move word to next line if it doesn't fit
}
if (Math.random() < 0.5)
g.setColor(new java.awt.Color((red + y*30) % 256,
(green + x/3) % 256, blue));
else
g.setColor(getBackground());
g.drawString(word, x, y);
x += w; //shift to the right to draw the next word
}
| | public void | start()
timer = new Timer(); //creates a new timer to schedule the blinking
timer.schedule(new TimerTask() { //creates a timertask to schedule
// overrides the run method to provide functionality
public void run() {
repaint();
}
}
, delay, delay);
| | public void | stop()
timer.cancel(); //stops the timer
|
|
