includes/clientside/static/flyin.js
author Dan
Mon, 02 Jul 2007 15:17:54 -0400
changeset 38 ed06961e54dd
parent 1 fe660c52c48f
child 39 c83ff194977a
permissions -rw-r--r--
Fixed user pages + the new .xx page URL format
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// Make an HTML element fly in from the top or bottom.
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// Includes inertia!
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// vB, don't even try. It's GPL like the rest of Enano. I know you're jealous. >:)
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var fly_in_cache = new Object();
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var FI_TOP = 1;
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var FI_BOTTOM = 2;
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var FI_IN = 1;
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var FI_OUT = 2;
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var FI_UP = 1;
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var FI_DOWN = 2;
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// Placeholder functions, to make organization a little easier :-)
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function fly_in_top(element, nofade, height_taken_care_of)
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{
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  return fly_core(element, nofade, FI_TOP, FI_IN, height_taken_care_of);
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}
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function fly_in_bottom(element, nofade, height_taken_care_of)
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{
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  return fly_core(element, nofade, FI_BOTTOM, FI_IN, height_taken_care_of);
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}
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function fly_out_top(element, nofade, height_taken_care_of)
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{
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  return fly_core(element, nofade, FI_TOP, FI_OUT, height_taken_care_of);
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}
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function fly_out_bottom(element, nofade, height_taken_care_of)
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{
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  return fly_core(element, nofade, FI_BOTTOM, FI_OUT, height_taken_care_of);
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}
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function fly_core(element, nofade, origin, direction, height_taken_care_of)
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{
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  if ( !element || typeof(element) != 'object' )
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    return false;
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  // target dimensions
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  var top, left;
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  // initial dimensions
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  var topi, lefti;
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  // current dimensions
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  var topc, leftc;
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  // screen dimensions
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  var w = getWidth();
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  var h = getHeight();
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  var y = parseInt ( getScrollOffset() );
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  // temp vars
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  var dim, off, diff, dist, ratio, opac_factor;
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  // setup element
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  element.style.position = 'absolute';
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  dim = [ $(element).Height(), $(element).Width() ];
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  off = [ $(element).Top(), $(element).Left() ];
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  if ( height_taken_care_of )
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  {
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    top = off[0];
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    left = off[1];
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  }
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  else
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  {
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    top  = Math.round(( h / 2 ) - ( dim[0] / 2 )) + y; // - ( h / 4 ));
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    left = Math.round(( w / 2 ) - ( dim[1] / 2 ));
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  }
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  // you can change this around to get it to fly in from corners or be on the left/right side
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  lefti = left;
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  // calculate first frame Y position
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  if ( origin == FI_TOP && direction == FI_IN )
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  {
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    topi = 0 - dim[0] + y;
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  }
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  else if ( origin == FI_TOP && direction == FI_OUT )
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  {
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    topi = top;
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    top = 0 - dim[0] + y;
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  }
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  else if ( origin == FI_BOTTOM && direction == FI_IN )
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  {
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    topi = h + y;
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  }
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  else if ( origin == FI_BOTTOM && direction == FI_OUT )
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  {
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    topi = top;
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    top = h + y;
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  }
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  var abs_dir = ( ( origin == FI_TOP && direction == FI_IN ) || ( origin == FI_BOTTOM && direction == FI_OUT ) ) ? FI_DOWN : FI_UP;
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  /*
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   * Framestepper parameters
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   */
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  // starting value for inertia
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  var inertiabase = 1;
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  // increment for inertia, or 0 to disable inertia effects
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  var inertiainc  = 1;
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  // when the progress reaches this %, deceleration is activated
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  var divider = 0.666667;
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  // multiplier for deceleration, setting this above 2 can cause some weird slowdown effects
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  var decelerate  = 2; // 1 / divider; // reciprocal of the divider
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  /*
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   * Timer parameters
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   */
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  // how long animation start is delayed, you want this at 0
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  var timer = 0;
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  // frame ttl
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  var timestep = 12;
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  // sanity check
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  var frames = 0;
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  // cache element so it can be changed from within setTimeout()
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  var rand_seed = Math.floor(Math.random() * 1000000);
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  fly_in_cache[rand_seed] = element;
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  // set element left pos, you can comment this out to preserve left position
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  element.style.left = left + 'px';
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  element.style.top  = topi + 'px';
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  if ( nofade )
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  {
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    domObjChangeOpac(100, element);
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  }
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  // total distance to be traveled
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  dist = abs(top - topi);
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  // animation loop
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  while ( true )
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  {
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    // used for a sanity check
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    frames++;
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    // time until this frame should be executed
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    timer += timestep;
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    // math stuff
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    // how far we are along in animation...
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    diff = abs(top - topi);
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    // ...in %
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    ratio = abs( 1 - ( diff / dist ) );
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    // decelerate if we're more than 2/3 of the way there
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    if ( ratio < divider )
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      inertiabase += inertiainc;
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    else
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      inertiabase -= ( inertiainc * decelerate );
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    // if the deceleration factor is anywhere above 1 then technically that can cause an infinite loop
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    // so leave this in there unless decelerate is set to 1
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    if ( inertiabase < 1 )
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      inertiabase = 1;
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    // uncomment to disable inertia
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    // inertiabase = 3;
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    // figure out frame Y position
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    topi = ( abs_dir == FI_UP ) ? topi - inertiabase : topi + inertiabase;
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    if ( ( abs_dir == FI_DOWN && topi > top ) || ( abs_dir == FI_UP && top > topi ) )
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      topi = top;
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    // tell the browser to do it
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    setTimeout('var o = fly_in_cache['+rand_seed+']; o.style.top=\''+topi+'px\';', timer);
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    if ( !nofade )
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    {
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      // handle fade
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      opac_factor = ratio * 100;
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      if ( direction == FI_OUT )
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        opac_factor = 100 - opac_factor;
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      setTimeout('var o = fly_in_cache['+rand_seed+']; domObjChangeOpac('+opac_factor+', o);', timer);
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    }
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    // if we're done or if our sanity check failed then break out of the loop
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    if ( ( abs_dir == FI_DOWN && topi >= top ) || ( abs_dir == FI_UP && top >= topi ) || frames > 1000 )
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      break;
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  }
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  //timer += timestep;
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  setTimeout('delete(fly_in_cache['+rand_seed+']);', timer);
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  return timer;
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}
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function abs(i)
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{
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  if ( isNaN(i) )
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    return i;
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  return ( i < 0 ) ? ( 0 - i ) : i;
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}
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