StringWalk
Java Source:
/*===================================================================
*
* Author : Bryan Harianto
* Title : StringWalk.java
* Date : November, 2001
*
* Fields : 1. caption ( e.g. caption0 )
* 2. url ( e.g. URL0 )
* 3. target ( e.g. _self, _parent, _top, _blank, name )
* 4. delay ( e.g. 10 )
* 5. fontface ( e.g. TimesRoman )
* 6. fontstyle ( e.g. plain, bold, italic )
* 7. fontsize ( e.g. 12 )
* 8. bgcolor ( e.g. 255,255,255 )
* 9. fgcolor ( e.g. 000,000,000 )
* 10.accolor ( e.g. 255,000,000 )
* 11.bdcolor ( e.g. 150,150,150 )
*
*===================================================================*/
import java.awt.*;
import java.applet.*;
import java.net.URL;
public class StringWalk extends Applet implements Runnable {
/*=======================
* Variable Declarations
*=======================*/
final static int MAX_SIZE = 100;
final static Cursor HAND = new Cursor(Cursor.HAND_CURSOR);
final static Cursor DEFAULT = new Cursor(Cursor.DEFAULT_CURSOR);
boolean isMoving;
int xx; // text location
int ntext; // number of text
int text_width; // text width
int width; // applet width
int height; // applet height
int delay; // time delay
int fontsize; // size of font
int mouse_x; // mouse x coordinate
int mouse_y; // mouse y coordinate
int selected; // selected caption
String[] s; // captions
String[] url; // urls
String[] target; // targets
Font font; // font face
FontMetrics fm; // font metrics
Thread runner;
Color fgcolor, bgcolor, accolor, bdcolor;
Image offscrImg; // double buffer image
Graphics offscr; // double buffer graphics
/*===========================
* Set Font and Color Method
*===========================*/
public void setFont() {
String fontface = getParameter("fontface");
if (fontface == null)
fontface = "Times Roman";
try { fontsize = Integer.parseInt(getParameter("fontsize")); }
catch (Exception e) { fontsize = 12; }
String fontstyle = getParameter("fontstyle");
if (fontstyle == null || fontstyle.equals("plain"))
font = new Font(fontface, Font.PLAIN, fontsize);
else if (fontstyle.equals("bold"))
font = new Font(fontface, Font.BOLD, fontsize);
else
font = new Font(fontface, Font.ITALIC, fontsize);
fm = offscr.getFontMetrics(font);
}
public void setColor() {
String c1 = getParameter("bgcolor");
String c2 = getParameter("fgcolor");
String c3 = getParameter("accolor");
String c4 = getParameter("bdcolor");
if (c1 == null) c1 = "255,255,255";
if (c2 == null) c2 = "000,000,000";
if (c3 == null) c3 = "255,000,000";
if (c4 == null) c4 = "150,150,150";
bgcolor = new Color(Integer.parseInt(c1.substring(0,3)),
Integer.parseInt(c1.substring(4,7)),
Integer.parseInt(c1.substring(8,11)));
fgcolor = new Color(Integer.parseInt(c2.substring(0,3)),
Integer.parseInt(c2.substring(4,7)),
Integer.parseInt(c2.substring(8,11)));
accolor = new Color(Integer.parseInt(c3.substring(0,3)),
Integer.parseInt(c3.substring(4,7)),
Integer.parseInt(c3.substring(8,11)));
bdcolor = new Color(Integer.parseInt(c4.substring(0,3)),
Integer.parseInt(c4.substring(4,7)),
Integer.parseInt(c4.substring(8,11)));
}
/*===================
* Initialize Method
*===================*/
public void init() {
isMoving = true;
runner = new Thread(this);
width = getSize().width;
height = getSize().height;
s = new String[MAX_SIZE];
url = new String[MAX_SIZE];
target = new String[MAX_SIZE];
offscrImg = createImage(width, height);
offscr = offscrImg.getGraphics();
runner.start();
setFont();
setColor();
try { delay = Integer.parseInt(getParameter("delay")); }
catch (Exception e) { delay = 10; }
String text;
ntext = text_width = xx = 0;
while ((text = getParameter("caption" + ntext)) != null) {
s[ntext] = text;
url[ntext] = getParameter("url" + ntext);
target[ntext] = getParameter("target" + ntext);
if (target[ntext] == null)
target[ntext] = "_blank";
text_width += fm.stringWidth(s[ntext]) + 20;
ntext++;
}
mouse_x = mouse_y = -text_width;
setSize(width,height);
offscr.setFont(font);
}
/*=========================
* Paint and Update Method
*=========================*/
public void paint(Graphics g) {
int c = 0;
int i = xx;
int h = (height + fontsize) / 2;
selected = -1;
boolean f = false;
while (s[c] != null && i < width) {
int w = fm.stringWidth(s[c]);
offscr.setColor(fgcolor);
if (mouse_x >= i && mouse_x <= i + w
&& mouse_y <= h && mouse_y >= h - fontsize) {
offscr.setColor(accolor);
offscr.drawLine(i, h + 2, i + w, h + 2);
f = true;
selected = c;
}
offscr.drawString(s[c], i, h);
i += w + 20;
if (++c >= ntext)
c = 0;
}
if (f)
setCursor(HAND);
else
setCursor(DEFAULT);
g.drawImage(offscrImg, 0, 0, this);
offscr.clearRect(0,0, getSize().width, getSize().height);
offscr.setColor(bgcolor);
offscr.fillRect(0, 0, getSize().width, getSize().height);
offscr.setColor(bdcolor);
offscr.drawRect(0, 0, getSize().width-1, getSize().height-1);
if (isMoving)
xx--;
if (i < -text_width)
xx = 0;
}
public void update(Graphics g) {
paint(g);
}
/*==============
* Mouse Method
*==============*/
public boolean mouseEnter(Event evt, int x, int y) {
isMoving = false;
return true;
}
public boolean mouseExit(Event evt, int x, int y) {
isMoving = true;
mouse_x = -text_width;
mouse_y = -text_width;
return true;
}
public boolean mouseMove(Event evt, int x, int y) {
mouse_x = x;
mouse_y = y;
return true;
}
public boolean mouseUp(Event evt, int x, int y) {
if (selected != -1 && url[selected] != null) {
try {
getAppletContext().showDocument(new URL(url[selected]), target[selected]);
}
catch (Exception e) { }
}
return true;
}
/*===============
* Thread Method
*===============*/
public void run() {
while(true) {
try { runner.sleep(delay); }
catch (Exception e) { }
repaint();
}
}
}
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