How It Works in Java

Generator EAN-13 in Java How It Works

This plug-in works in almost the same fashion as the MatrixToText() plug-in except that the string text is slowly scrambled over time and assigned to the id object to display it a full explanation can be found in the notes in the section Plug-in 72: MatrixToText()

To use this plug-in, pass it an object, such as a div or span that contains some text, and tell it how long the scramble transition should take, as with this example:

<font face='Courier New' size='6'><b> <div id='text'>Welcome to the best science fiction and fantasy fan website in the world!</div> </b></font> <script> windowonload = function()

Note that I snuck in a call to the FadeOut() plug-in in this example as it makes for an interesting combined effect of the scrambling text slowly fading away this is just one example of how you can combine these plug-in to produce even more complex and interesting results You may also notice that I omitted the interruptible argument to FadeOut() Therefore, this passes a value of undefined for that argument to the function, which will be treated as if it was the value false and so it saves on typing

function TextToMatrix(id, msecs) { if (id instanceof Array) { for (var j = 0 ; j < idlength ; ++j) TextToMatrix(id[j], msecs) return } if (O(id)TM_Flag) return else O(id)TM_Flag = true var var var var var text len freq count chars Html(id) textlength Mathround(msecs / INTERVAL) 0 'ABCDEFGHIHJKLMOPQRSTUVWXYZ' + 'abcdefghijklmnopqrstuvwxyz' + '0123456789' = setInterval(DoTextToMatrix, freq) = = = = =

function DoTextToMatrix() { for (var j = 0 ; j < len / 20 ; ++j) { var k = Mathfloor(Mathrandom() * len) var l = Mathfloor(Mathrandom() * charslength) if (text[k] != '\n' && text[k] != '\r' && text[k] != ' ') text = textsubstr(0, k) + chars[l] + textsubstr(k + 1) } if (O(id)innerText) O(id)innerText = text else O(id)textContent = text

9:

if (++count == INTERVAL) { O(id)TM_Flag = false clearInterval(iid) } } }

74 ColorFade()

This plug-in provides a very smooth transition effect between two different colors, and you can use it with either an object s text or its background colors Figure 9-5 shows two elements that have been set to fade colors The first continuously alternates between yellow and blue text and background colors, while the second fades from black to light blue when the mouse is passed over it

This plug-in changes the text or background color of the contents of an object over a specified period of time It requires the following arguments:

An object or object ID or an array of objects and/or object IDs The start color expressed as a six-digit hexadecimal number The end color expressed as a six-digit hexadecimal number

The property to change, either text for the text color, or back (or anything other than text ) for the background color The number of milliseconds the transition should take The number of times the transition should repeat, with 0 meaning infinite

Figure 9-5

j step index count direc cols[] steps[] prop iid temp CF_Flagtext CF_Flagback INTERVAL DoColorFade() ZeroToFF() DecHex() setInterval() clearInterval() Mathround() Mathmax() Mathmin() Local variable that indexes into id if it is an array, and for splitting the colors into triplets Local variable containing the amount of change between each transition frame Local variable used as a multipliers fort generating color values Local variable containing a counter for counting the repeats Local variable containing the direction of color change, either 1 or 1 Local array containing the from color triplets Local array containing the step between each color triplet Local variable containing the property to change either color or backgroundColor Local variable containing the value returned by setInterval(), to be used later by clearInterval() Local variable used for building up each transition color Property of id that is true if a color change transition is in effect on it Property of id that is true if a background color change transition is in effect on it Global variable with the value 30 Subfunction to perform the color changes Sub-subfunction to ensure values are integers between 0 and 255 (equal to 00 to FF hexadecimal) Plug-in to convert a decimal value to hexadecimal Function to set up repeating interrupts Function to stop repeating interrupts Function to turn a floating point number into an integer Function to return the maximum of two values Function to return the minimum of two values