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txtf.jav
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1998-12-30
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3KB
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128 lines
<!---BeginTitle--->Text color Fade<!---BeginJAVHead---><script language="JavaScript">
<!--
/*
colourGradient
JavaScript to display text in a colour gradient.
This is achieved by displaying each character of the text in a different
colour.
Copyright, Bipin Patwardhan (bsp204@yahoo.com)
Feel free to use this script as long as this copyright message is
retained.
----- ***** -----
Usage:
colourGradient(colour, flag, rStep, gStep, bStep, str)
where,
colour -- rgb triplet, specified in hex
flag -- indicating which component should be changed
r - only red, g - only green, b - only blue
rg - red & green, rb - red & blue, gb - green & blue
rgb - red, green & blue
rStep -- step for red component
gStep -- step for green component
bStep -- step for blue component
str -- string to display
*/
function decToHex(dec) {
hexChars = "0123456789ABCDEF"
if ( dec > 255 ) dec = dec % 255
var i = dec % 16
var j = (dec - i) / 16
result = hexChars.charAt(j) + hexChars.charAt(i)
return result
}
/* // another one
function decToHex(dec) {
hex = new Array("0", "1", "2", "3", "4", "5", "6", "7",
"8", "9", "A", "B", "C", "D", "E", "F")
tmp = hex[Math.floor(dec/16)] + hex[dec/16];
return tmp
}
*/
function hexToDec(hex) {
num = 0
num1 = 0
if ( ( hex.charAt(0) >= '0' ) && ( hex.charAt(0) <= '9' ) )
num = parseInt(hex.charAt(0))
if ( hex.charAt(0) == 'a' ) num = 10
if ( hex.charAt(0) == 'b' ) num = 11
if ( hex.charAt(0) == 'c' ) num = 12
if ( hex.charAt(0) == 'd' ) num = 13
if ( hex.charAt(0) == 'e' ) num = 14
if ( hex.charAt(0) == 'f' ) num = 15
if ( ( hex.charAt(1) >= '0' ) && ( hex.charAt(1) <= '9' ) )
num1 = parseInt(hex.charAt(1))
if ( hex.charAt(1) == 'a' ) num1 = 10
if ( hex.charAt(1) == 'b' ) num1 = 11
if ( hex.charAt(1) == 'c' ) num1 = 12
if ( hex.charAt(1) == 'd' ) num1 = 13
if ( hex.charAt(1) == 'e' ) num1 = 14
if ( hex.charAt(1) == 'f' ) num1 = 15
num = num * 16 + num1
return num
}
function colourLookup(name) {
if ( name == "red" ) return "ff0000";
if ( name == "green" ) return "00ff00";
if ( name == "blue" ) return "0000ff";
return "ffffff"
}
function showText(r, g, b, str) {
document.write("<font color=\"#" + r + g + b + "\">")
document.write(str)
document.write("</font>")
}
function colourGradientPrimary(r, g, b, flag, rStep, gStep, bStep, str)
{
r = hexToDec(r); g = hexToDec(g); b = hexToDec(b);
for ( i=0; i < str.length; i++ ) {
showText(decToHex(r), decToHex(g), decToHex(b), str.charAt(i))
if ( flag == "r" ) r += rStep
if ( flag == "g" ) g += gStep
if ( flag == "b" ) b += bStep
if ( flag == "rg" ) { r += rStep; g += gStep; }
if ( flag == "rb" ) { r += rStep; g += gStep; }
if ( flag == "gb" ) { g += gStep; b += bStep; }
if ( flag == "rgb" ) { r += rStep; g += gStep; b += bStep; }
}
}
function colourGradient(colour, flag, rStep, gStep, bStep, str) {
colourGradientPrimary(colour.substring(0, 2),
colour.substring(2, 4), colour.substring(4, 6),
flag, rStep, gStep, bStep, str)
}
function colorGradient(colour, flag, rStep, gStep, bStep, str) {
colourGradient(colour, flag, rStep, gStep, bStep, str)
}
// -->
</script><!---BeginJAVBody---><h4>
<script>
<!--
colourGradient("000000", "rb", 7, 1, 5,
"This is a very long string being used for testing purposes")
// -->
</script>
</h4><!--EndJAVBody-->