Updater.java

• 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();
}
}

}

HTML <html>

<applet code="StringWalk.class" width=500 height=25> <param name="delay" value="10">

<param name="fontface" value="Times Roman"> <param name="fontstyle" value="plain"> <param name="fontsize" value="12">

<param name="bgcolor" value="255,255,255"> <param name="fgcolor" value="000,000,000"> <param name="accolor" value="255,000,000"> <param name="bdcolor" value="150,150,150">

<param name="caption0" value="University of New South Wales"> <param name="url0" value="http://www.unsw.edu.au"> <param name="target0" value="_blank">

<param name="caption1" value="Computer Science and Engineering"> <param name="url1" value="http://www.cse.unsw.edu.au"> <param name="target1" value="_blank">

<param name="caption2" value="Software Engineering"> <param name="url2" value="http://www.cse.unsw.edu.au/seng"> <param name="target2" value="_blank">

</applet>

</html>

Immutable page (last modified 2005-05-23 02:47:07)

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