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| JAVA-LED |
| 天极软件 |
| 2005-11-24 10:27:00文/佚名 |
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<script LANGUAGE="JavaScript">
<!--// Copyright 1996 - Tomer and Yehuda Shiran
// This example will appear in our forthcoming book on JavaScript.
// set messages
var messages = new Array()
messages[0] = "welcome to javahouse"
messages[1] = "javascript world!"
messages[2] = "the largest archive"
messages[3] = "on the net!"
messages[4] = "tons of great fun"
messages[5] = "thanks for visiting"
messages[6] = "enjoy the ride"
// set normal spacing between two characters (no whitespace inbetween)
var space = 1
// set height width of each character
var height = 5
var width = 3
// create object of all supported characters in font
var letters = new letterArray()
// initialize image variables
var on = new Image(5, 5)
var off = new Image(5, 5)
// set image URLs
on.src = "ledon.gif"
off.src = "ledoff.gif"
// get number of images already layed out in page
var imageNum = document.images.length
// set maximum message length in characters
var boardWidth = 0
for (var i = 0; i < messages.length; ++i) {
var lengthWithNoSpaces = messages[i].split(" ").join("").length
var numberOfSpaces = messages[i].length - lengthWithNoSpaces
var currentBoardWidth = lengthWithNoSpaces * (width + space) - space + numberOfSpaces * space * 2
if (boardWidth < currentBoardWidth)
boardWidth = currentBoardWidth
}
// sign is currently not running
var running = false
var timerID = null
function letterArray() {
this.a = new Array(height)
this.a[0] = " * "
this.a[1] = "* *"
this.a[2] = "***"
this.a[3] = "* *"
this.a[4] = "* *"
this.b = new Array(height)
this.b[0] = "** "
this.b[1] = "* *"
this.b[2] = "**"
this.b[3] = "* *"
this.b[4] = "**"
this.c = new Array(height)
this.c[0] = "***"
this.c[1] = "* "
this.c[2] = "* "
this.c[3] = "* "
this.c[4] = "***"
this.d = new Array(height)
this.d[0] = "** "
this.d[1] = "* *"
this.d[2] = "* *"
this.d[3] = "* *"
this.d[4] = "** "
this.e = new Array(height)
this.e[0] = "*** "
this.e[1] = "* "
this.e[2] = "***"
this.e[3] = "* "
this.e[4] = "***"
this.f = new Array(height)
this.f[0] = "***"
this.f[1] = "* "
this.f[2] = "***"
this.f[3] = "* "
this.f[4] = "* "
this.g = new Array(height)
this.g[0] = "***"
this.g[1] = "* "
this.g[2] = "***"
this.g[3] = "* *"
this.g[4] = "***"
this.h = new Array(height)
this.h[0] = "* *"
this.h[1] = "* *"
this.h[2] = "***"
this.h[3] = "* *"
this.h[4] = "* *"
this.i = new Array(height)
this.i[0] = "***"
this.i[1] = " * "
this.i[2] = " * "
this.i[3] = " * "
this.i[4] = "***"
this.j = new Array(height)
this.j[0] = " *"
this.j[1] = " *"
this.j[2] = " *"
this.j[3] = "* *"
this.j[4] = "***"
this.k = new Array(height)
this.k[0] = "* *"
this.k[1] = "* *"
this.k[2] = "**"
this.k[3] = "* *"
this.k[4] = "* *"
this.l = new Array(height)
this.l[0] = "* "
this.l[1] = "* "
this.l[2] = "* "
this.l[3] = "* "
this.l[4] = "***"
this.m = new Array(height)
this.m[0] = "* *"
this.m[1] = "***"
this.m[2] = "***"
this.m[3] = "* *"
this.m[4] = "* *"
this.n = new Array(height)
this.n[0] = "* *"
this.n[1] = "***"
this.n[2] = "***"
this.n[3] = "***"
this.n[4] = "* *"
this.o = new Array(height)
this.o[0] = "***"
this.o[1] = "* *"
this.o[2] = "* *"
this.o[3] = "* *"
this.o[4] = "***"
this.p = new Array(height)
this.p[0] = "** "
this.p[1] = "* *"
this.p[2] = "** "
this.p[3] = "* "
this.p[4] = "* "
this.q = new Array(height)
this.q[0] = "***"
this.q[1] = "* *"
this.q[2] = "* *"
this.q[3] = "***"
this.q[4] = "***"
this.r = new Array(height)
this.r[0] = "** "
this.r[1] = "* *"
this.r[2] = "** "
this.r[3] = "* *"
this.r[4] = "* *"
this.s = new Array(height)
this.s[0] = "***"
this.s[1] = "* "
this.s[2] = "***"
this.s[3] = " *"
this.s[4] = "***"
this.t = new Array(height)
this.t[0] = "***"
this.t[1] = " * "
this.t[2] = " * "
this.t[3] = " * "
this.t[4] = " * "
this.u = new Array(height)
this.u[0] = "* *"
this.u[1] = "* *"
this.u[2] = "* *"
this.u[3] = "* *"
this.u[4] = "***"
this.v = new Array(height)
this.v[0] = "* *"
this.v[1] = "* *"
this.v[2] = "* *"
this.v[3] = "* *"
this.v[4] = " * "
this.w = new Array(height)
this.w[0] = "* *"
this.w[1] = "* *"
this.w[2] = "***"
this.w[3] = "***"
this.w[4] = "***"
this.x = new Array(height)
this.x[0] = "* *"
this.x[1] = "* *"
this.x[2] = " * "
this.x[3] = "* *"
this.x[4] = "* *"
this.y = new Array(height)
this.y[0] = "* *"
this.y[1] = "* *"
this.y[2] = "***"
this.y[3] = " * "
this.y[4] = " * "
this.z = new Array(height)
this.z[0] = "***"
this.z[1] = " *"
this.z[2] = " *"
this.z[3] = "* "
this.z[4] = "***"
this['!'] = new Array(height)
this['!'][0] = " * "
this['!'][1] = " * "
this['!'][2] = " * "
this['!'][3] = " "
this['!'][4] = " * "
this[':'] = new Array(height)
this[':'][0] = " "
this[':'][1] = " * "
this[':'][2] = " "
this[':'][3] = " * "
this[':'][4] = " "
this['.'] = new Array(height)
this['.'][0] = " "
this['.'][1] = " "
this['.'][2] = " "
this['.'][3] = " "
this['.'][4] = " * "
this['='] = new Array(height)
this['='][0] = " "
this['='][1] = "***"
this['='][2] = " "
this['='][3] = "***"
this['='][4] = " "
this['='] = new Array(height)
this['='][0] = " "
this['='][1] = "***"
this['='][2] = " "
this['='][3] = "***"
this['='][4] = " "
this['+'] = new Array(height)
this['+'][0] = " "
this['+'][1] = " * "
this['+'][2] = "***"
this['+'][3] = " * "
this['+'][4] = " "
this['-'] = new Array(height)
this['-'][0] = " "
this['-'][1] = " "
this['-'][2] = "***"
this['-'][3] = " "
this['-'][4] = " "
this['/'] = new Array(height)
this['/'][0] = " *"
this['/'][1] = " *"
this['/'][2] = " * "
this['/'][3] = "* "
this['/'][4] = "* "
this['\\'] = new Array(height)
this['\\'][0] = "* "
this['\\'][1] = "* "
this['\\'][2] = " * "
this['\\'][3] = " *"
this['\\'][4] = " *"
this['\\'] = new Array(height)
this['\\'][0] = "* "
this['\\'][1] = "* "
this['\\'][2] = " * "
this['\\'][3] = " *"
this['\\'][4] = " *"
this['"'] = new Array(height)
this['"'][0] = "* *"
this['"'][1] = "* *"
this['"'][2] = "* *"
this['"'][3] = " "
this['"'][4] = " "
this["'"] = new Array(height)
this["'"][0] = " * "
this["'"][1] = " * "
this["'"][2] = " * "
this["'"][3] = " "
this["'"][4] = " "
this['('] = new Array(height)
this['('][0] = " *"
this['('][1] = " * "
this['('][2] = " * "
this['('][3] = " * "
this['('][4] = " *"
this[')'] = new Array(height)
this[')'][0] = "* "
this[')'][1] = " * "
this[')'][2] = " * "
this[')'][3] = " * "
this[')'][4] = "* "
this['*'] = new Array(height)
this['*'][0] = " "
this['*'][1] = "***"
this['*'][2] = "***"
this['*'][3] = "***"
this['*'][4] = " "
this['?'] = new Array(height)
this['?'][0] = "** "
this['?'][1] = " *"
this['?'][2] = " * "
this['?'][3] = " "
this['?'][4] = " * "
this['0'] = new Array(height)
this['0'][0] = " * "
this['0'][1] = "* *"
this['0'][2] = "* *"
this['0'][3] = "* *"
this['0'][4] = " * "
this['1'] = new Array(height)
this['1'][0] = " * "
this['1'][1] = " * "
this['1'][2] = " * "
this['1'][3] = " * "
this['1'][4] = " * "
this['2'] = new Array(height)
this['2'][0] = "***"
this['2'][1] = " *"
this['2'][2] = "***"
this['2'][3] = "* "
this['2'][4] = "***"
this['3'] = new Array(height)
this['3'][0] = "***"
this['3'][1] = " *"
this['3'][2] = "***"
this['3'][3] = " *"
this['3'][4] = "***"
this['4'] = new Array(height)
this['4'][0] = "* *"
this['4'][1] = "* *"
this['4'][2] = "***"
this['4'][3] = " *"
this['4'][4] = " *"
this['5'] = new Array(height)
this['5'][0] = "***"
this['5'][1] = "* "
this['5'][2] = "***"
this['5'][3] = " *"
this['5'][4] = "** "
this['6'] = new Array(height)
this['6'][0] = "** "
this['6'][1] = "* "
this['6'][2] = "***"
this['6'][3] = "* *"
this['6'][4] = "***"
this['7'] = new Array(height)
this['7'][0] = "***"
this['7'][1] = " *"
this['7'][2] = " * "
this['7'][3] = "* "
this['7'][4] = "* "
this['8'] = new Array(height)
this['8'][0] = "***"
this['8'][1] = "* *"
this['8'][2] = "***"
this['8'][3] = "* *"
this['8'][4] = "***"
this['9'] = new Array(height)
this['9'][0] = "***"
this['9'][1] = "* *"
this['9'][2] = "***"
this['9'][3] = " *"
this['9'][4] = "***"
}
function drawBlank() {
// assign greater than symbol to variable
var gt = unescape("%3e")
document.write('<TABLE BORDER=2 CELLPADDING=8' + gt + '<TR' + gt + '<TD WIDTH=468 BGCOLOR ALIGN="center" VALIGN="center"' + gt)
// print entire board of off images
for (var y = 0; y < height; ++y) {
for (var x = 0; x < boardWidth; ++x) {
document.write('<IMG SRC="' + off.src + '" HEIGHT=5 WIDTH=5' + gt)
}
document.write('<BR' + gt)
}
document.write('</TD' + gt + '</TR' + gt + '</TABLE' + gt)
}
function setLight(state, x, y) {
// set a specific light in sign to on (true) or off (false)
if (state)
document.images[computeIndex(x, y)].src = on.src
else
document.images[computeIndex(x, y)].src = off.src
}
function drawLetter(letter, startX) {
// draws a letter at the given x coordinate
for (var x = 0; x < width; ++x) {
for (var y = 0; y < height; ++y) {
setLight(letters[letter][y].charAt(x) == "*", startX + x, y)
}
}
}
function drawSpace(startX) {
// create a small space between each two characters
for (var x = 0; x < space; ++x) {
for (var y = 0; y < height; ++y) {
setLight(false, startX + x, y)
}
}
}
function computeIndex(x, y) {
// compute the document index of an image in the sign, based on the x-y coordinates
return (y * boardWidth + x) + imageNum
}
function floodBoard(startX) {
// set all lights from startX to off
for (var x = startX; x < boardWidth; ++x) {
for (var y = 0; y < height; ++y) {
setLight(false, x, y)
}
}
}
function drawMessage(num) {
// initialize variable to current message
var text = messages[num]
// initialize two counters (j - current character in message, i - current x coordinate)
var i = 0
var j = 0
while (1) {
if (text.charAt(j) != " ") {
// draw current letter
drawLetter(text.charAt(j), i)
// increment i by the constant width of an image
i += width
}
else {
// add an extra space (do not advance j yet)
drawSpace(i)
i += space
}
// if j is less that index of last character
if (j < text.length - 1) {
drawSpace(i)
i += space
}
else
// j is the index of the last character (lsat character already printed)
break
// increment j by one because one letter was printed
++j
}
// flood the remaining piece of the sign (turn it off)
floodBoard(i)
// if message printed this time was not the last one in the array
if (num < messages.length - 1)
// val *must* be a global variable for use with the timeout
val = ++num
else
val = 0 // start cycle over again
// recursive call after waiting 3 seconds (some of the time already passed during printing)
timerID = setTimeout("drawMessage(val)", 3000)
}
// open form
document.write('<FORM>')
// create initial sign (all sign is off)
drawBlank()
function startSign() {
// wait 3 seconds and then call function to print first message
drawMessage(0)
running = true
}
function stopSign() {
if(running)
clearTimeout(timerID)
running = false
}
document.write('<INPUT TYPE="button" VALUE="start" onClick="startSign()">')
document.write('<INPUT TYPE="button" VALUE="stop" onClick="stopSign(); floodBoard(0)">')
document.write('</FORM>')
// -->
</script>
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