source: extensions/GDThumb/js/gdthumb.js @ 30225

var GDThumb = {

  max_height: 200,
  margin: 10,
  max_first_thumb_width: 0.7,
  big_thumb: null,
  big_thumb_block: false,
  check_pv: false,
  small_thumb: null,
  method: 'crop',
  t: new Array,

  // Initialize plugin logic, perform necessary steps
  setup: function(method, max_height, margin, do_merge, big_thumb, check_pv) {

    jQuery('ul#thumbnails').addClass("thumbnails");

    GDThumb.max_height = max_height;
    GDThumb.margin     = margin;
    GDThumb.method     = method;
    GDThumb.check_pv   = check_pv;

    if (do_merge) { GDThumb.merge(); }

    GDThumb.big_thumb = big_thumb;
    GDThumb.build();
    jQuery(window).bind('RVTS_loaded', GDThumb.build);
    jQuery('ul.thumbnails').resize(GDThumb.process);
    jQuery("ul.thumbnails .thumbLegend.overlay").click( function() { window.location.href = $(this).parent().find('a').attr('href'); });
    jQuery("ul.thumbnails .thumbLegend.overlay-ex").click( function() { window.location.href = $(this).parent().find('a').attr('href'); });
  },

  // Merge categories and picture lists
  merge: function() {

    var mainlists = $('.content ul.thumbnails');
    if (mainlists.length < 2) {
      // there is only one list of elements
    } else {
      $(".thumbnailCategories li").addClass("album");
      $(".thumbnailCategories").append($(".content ul#thumbnails").html());     
      $("ul#thumbnails").remove();  
      $("div.loader:eq(1)").remove();
    }
  },

  // Build thumb metadata
  build: function () {

    if ((GDThumb.method == 'square') && (GDThumb.big_thumb != null) && (GDThumb.big_thumb.height != GDThumb.big_thumb.width)) {
      var main_width = jQuery('ul.thumbnails').width();
      var max_col_count = Math.floor(main_width / GDThumb.max_height);
      var thumb_width   = Math.floor(main_width / max_col_count) - GDThumb.margin;

      GDThumb.big_thumb.height = (thumb_width * 2) + GDThumb.margin;
      GDThumb.big_thumb.width  = GDThumb.big_thumb.height;
      GDThumb.big_thumb.crop   = GDThumb.big_thumb.height;
      GDThumb.max_height = thumb_width;
    } 

    GDThumb.t = new Array;
    $('ul.thumbnails img.thumbnail').each(function(index) {
      width = parseInt(jQuery(this).attr('width'));
      height = parseInt(jQuery(this).attr('height'));
      th = {index: index, width: width, height: height, real_width: width, real_height: height};
      if (GDThumb.check_pv) {
        var ratio = th.width / th.height;
        GDThumb.big_thumb_block = (ratio > 2.2) || (ratio < 0.455);
      }
      if ((GDThumb.method == 'square') && (th.height != th.width)) {
        th.height = GDThumb.max_height;
        th.width  = GDThumb.max_height;
        th.crop   = GDThumb.max_height;
      } else if (height < GDThumb.max_height) {
        th.width = Math.round(GDThumb.max_height * width / height);
        th.height = GDThumb.max_height;
      }

      GDThumb.t.push(th);
    });

    if (GDThumb.big_thumb_block) {
      GDThumb.big_thumb = null;
    }

    first = GDThumb.t[0];
    if (first) {
      GDThumb.small_thumb = {index: first.index, width: first.real_width, height: first.real_height, src: jQuery('ul.thumbnails img.thumbnail:first').attr('src')}
    }
    jQuery.resize.throttleWindow = false;
    jQuery.resize.delay = 50;
    GDThumb.process();
  },

  // Adjust thumb attributes to match plugin settings
  process: function() {

    var width_count = GDThumb.margin;
    var line = 1;
    var round_rest = 0;
    var main_width = jQuery('ul.thumbnails').width();
    var first_thumb = jQuery('ul.thumbnails img.thumbnail:first');
    var best_size = {width: 1, height: 1};

    if (GDThumb.method == 'square') {
      if (GDThumb.big_thumb != null) {
        best_size.width = GDThumb.big_thumb.width;
        best_size.height = GDThumb.big_thumb.height;

        if (GDThumb.big_thumb.src != first_thumb.attr('src')) {
          first_thumb.attr('src', GDThumb.big_thumb.src).attr({width: GDThumb.big_thumb.width, height: GDThumb.big_thumb.height});
          GDThumb.t[0].width = GDThumb.big_thumb.width;
          GDThumb.t[0].height = GDThumb.big_thumb.height;
        }
        GDThumb.t[0].crop = best_size.width;
        GDThumb.resize(first_thumb, GDThumb.t[0].real_width, GDThumb.t[0].real_height, GDThumb.big_thumb.width, GDThumb.big_thumb.height, true);
      }else{
        best_size.width  = GDThumb.max_height;
        best_size.height = GDThumb.max_height;
        GDThumb.resize(first_thumb, GDThumb.t[0].real_width, GDThumb.t[0].real_height, GDThumb.t[0].width, GDThumb.t[0].height, true);
      }
    } else {
      if (GDThumb.big_thumb != null && GDThumb.big_thumb.height < main_width * GDThumb.max_first_thumb_width) {

        // Compute best size for landscape picture (we choose bigger height)
        min_ratio = Math.min(1.05, GDThumb.big_thumb.width/GDThumb.big_thumb.height);

        for(width = GDThumb.big_thumb.width; width/best_size.height>=min_ratio; width--) {
          width_count = GDThumb.margin;
          height = GDThumb.margin;
          max_height = 0;
          available_width = main_width - (width + GDThumb.margin);
          line = 1;
          for (i=1;i<GDThumb.t.length;i++) {
  
            width_count += GDThumb.t[i].width + GDThumb.margin;
            max_height = Math.max(GDThumb.t[i].height, max_height);
  
            if (width_count > available_width) {
              ratio = width_count / available_width;
              height += Math.round(max_height / ratio);
              line++;
              max_height = 0;
              width_count = GDThumb.margin;
              if (line > 2) {
                if (height >= best_size.height && width/height >= min_ratio && height<=GDThumb.big_thumb.height) {
                  best_size = {width:width,height:height};
                }
                break;
              }
            }
          }
          if (line <= 2) {
            if (max_height == 0 || line == 1) {
              height = GDThumb.big_thumb.height;
            } else {
              height += max_height;
            }
            if (height >= best_size.height && width/height >= min_ratio && height<=GDThumb.big_thumb.height) {
              best_size = {width:width,height:height}
            }
          }
        }
        if (GDThumb.big_thumb.src != first_thumb.attr('src')) {
          first_thumb.attr('src', GDThumb.big_thumb.src).attr({width: GDThumb.big_thumb.width, height: GDThumb.big_thumb.height});
          GDThumb.t[0].width = GDThumb.big_thumb.width;
          GDThumb.t[0].height = GDThumb.big_thumb.height;
        }
        GDThumb.t[0].crop = best_size.width;
        GDThumb.resize(first_thumb, GDThumb.big_thumb.width, GDThumb.big_thumb.height, best_size.width, best_size.height, true);
      }
    }

    if (best_size.width == 1) {
      if (GDThumb.small_thumb != null && GDThumb.small_thumb.src != first_thumb.attr('src')) {  
        first_thumb.prop('src', GDThumb.small_thumb.src).attr({width: GDThumb.small_thumb.width, height: GDThumb.small_thumb.height});
        GDThumb.t[0].width = GDThumb.small_thumb.width;
        GDThumb.t[0].height = GDThumb.small_thumb.height;
      }
      GDThumb.t[0].crop = false;
    }

    width_count = GDThumb.margin;
    max_height = 0;
    last_height = GDThumb.max_height;
    line = 1;
    thumb_process = new Array;

    for (i=GDThumb.t[0].crop!=false?1:0;i<GDThumb.t.length;i++) {

      width_count += GDThumb.t[i].width + GDThumb.margin;
      max_height = Math.max(GDThumb.t[i].height, max_height);
      thumb_process.push(GDThumb.t[i]);

      available_width = main_width;
      if (line <= 2 && GDThumb.t[0].crop !== false) {
        available_width -= (GDThumb.t[0].crop + GDThumb.margin);
      }

      if (width_count > available_width) {

        last_thumb = GDThumb.t[i].index;
        ratio = width_count / available_width;
        new_height = Math.round(max_height / ratio);
        round_rest = 0;
        width_count = GDThumb.margin;

        for (j=0;j<thumb_process.length;j++) {

          if (GDThumb.method == 'square') {
            new_width  = GDThumb.max_height;
            new_height = GDThumb.max_height;
          } else {
            if (thumb_process[j].index == last_thumb) {
              new_width = available_width - width_count - GDThumb.margin;
            } else {
              new_width = (thumb_process[j].width + round_rest) / ratio;
              round_rest = new_width - Math.round(new_width);
              new_width = Math.round(new_width);
            }
          }
          GDThumb.resize(jQuery('ul.thumbnails img.thumbnail').eq(thumb_process[j].index), thumb_process[j].real_width, thumb_process[j].real_height, new_width, new_height, false);
          last_height = Math.min(last_height, new_height);

          width_count += new_width + GDThumb.margin;
        }
        thumb_process = new Array;
        width_count = GDThumb.margin;
        max_height = 0;
        line++;
      }
    }

    if (last_height == 0) {
      last_height = GDThumb.max_height;
    }

    // Last line does not need to be cropped
    for (j=0;j<thumb_process.length;j++) {
      GDThumb.resize(jQuery('ul.thumbnails img.thumbnail').eq(thumb_process[j].index), thumb_process[j].real_width, thumb_process[j].real_height, thumb_process[j].width, last_height, false);
    }

    if (main_width != jQuery('ul.thumbnails').width()) {
      GDThumb.process();
    }
  },

  resize: function(thumb, width, height, new_width, new_height, is_big) {
    if ((!is_big) && (GDThumb.method == 'square')) {
      thumb.css({height: '', width: ''});
      new_width = new_height;

      if (width < height) {
        real_height = Math.round(height * new_width / width);
        real_width  = new_width;
      } else {
        real_height = new_width;
        real_width  = Math.round(width * new_height / height);
      }

      height_crop = Math.round((real_height - new_height) / 2);
      width_crop = Math.round((real_width - new_height) / 2);
      thumb.css({
        height: real_height+'px',
        width: real_width+'px'
      });
    }else if (GDThumb.method == 'resize' || height < new_height || width < new_width) {
      real_width = new_width;
      real_height = new_height;
      width_crop = 0;
      height_crop = 0;

      if (is_big) {
        if (width - new_width > height - new_height) {
          real_width = Math.round(new_height * width / height);
          width_crop = Math.round((real_width - new_width)/2);
        } else {
          real_height = Math.round(new_width * height / width);
          height_crop = Math.round((real_height - new_height)/2);
        }
      }
      thumb.css({
        height: real_height+'px',
        width: real_width+'px'
      });
    } else {
      thumb.css({height: '', width: ''});
      height_crop = Math.round((height - new_height)/2);
      width_crop = Math.round((width - new_width)/2);
    }

    thumb.parents('li').css({ height: new_height+'px', width: new_width+'px' });
    thumb.parent('a').css({ clip: 'rect('+height_crop+'px, '+(new_width+width_crop)+'px, '+(new_height+height_crop)+'px, '+width_crop+'px)', top: -height_crop+'px', left: -width_crop+'px' });
  }
}