mirror of
https://github.com/flynx/ImageGrid.git
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279 lines
7.2 KiB
JavaScript
Executable File
279 lines
7.2 KiB
JavaScript
Executable File
/*********************************************************************/
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/*
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* The folowing two functions will get the vertical and horizontal
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* distance components between the pints a and A, centers of the small
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* and large squares respectively.
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* One of the squares is .field and the other is .container,
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* which is small or big is not important.
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*
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* +---------------+-------+
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* | | |
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* | | |
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* | + a . . | . . . | . +
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* | . | | +- getCurrentVerticalOffset(...)
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* | . + A | . . . | . +
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* +---------------+ |
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* | . . |
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* | . . |
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* | . . |
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* +-----------------------+
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* . .
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* +-+-+
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* +------------------- getCurrentHorizontalOffset(...)
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*
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*
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* Adding this distance to margins of one of the sqares will effectively
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* allign the two points.
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*
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* NOTE: neither function accunts for field margins.
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*
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*/
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// get the vertical offset of the center of square from center of container
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// NOTE: this does not account for field margins
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function getCurrentVerticalOffset(image){
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if(image == null){
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image = $('.image.current')
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}
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var scale = getElementScale($('.field'))
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var ribbons = $('.ribbon')
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var ribbon = image.parents('.ribbon')
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var images = ribbon.children('.image')
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// vertical...
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var H = $('.container').height()
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var h = ribbons.outerHeight(true)
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// margin...
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var mh = h - ribbons.outerHeight()
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// current ribbon position (1-based)
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var rn = ribbons.index(ribbon) + 1
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// XXX compensating for margin error buildup... really odd!
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// ...why is this still different for the first three ribbons?!
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// ....sub-pixel error?
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// relative position to field...
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// XXX is there a better way to get this?
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var t = rn * (h - mh/2)
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return -t + H/2 + h/2
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}
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// get the horizontal offset of the center of square from center of container
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// NOTE: this does not account for field margins
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function getCurrentHorizontalOffset(image){
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if(image == null){
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image = $('.image.current')
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}
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var ribbon = image.parents('.ribbon')
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var images = ribbon.children('.image')
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var W = $('.container').width()
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var w = images.outerWidth(true)
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// margin...
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// XXX do we need this?
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var mw = w - images.outerWidth()
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// current square position (1-based)
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var sn = images.index(image) + 1
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var l = sn * (w - mw/2)
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return -l + W/2 + w/2
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}
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function centerSquare(){
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$('.field').css({
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'margin-top': getCurrentVerticalOffset()
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})
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// horizontal...
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alignRibbon()
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centerCurrentImage()
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}
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function alignRibbon(image, position){
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// default values...
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if(image == null){
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image = $('.image.current')
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}
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if(position == null){
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position = 'center'
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}
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var ribbon = image.parents('.ribbon')
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// account for margined field...
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// NOTE: this enables us to cheat and shift all the ribbons just
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// by changing field margin-left...
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var cml = parseFloat($('.field').css('margin-left'))
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if(!cml){
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cml = 0
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}
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var h_offset = getCurrentHorizontalOffset(image) - cml
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var w = $('.image').outerWidth(true)
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switch(position){
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case 'before':
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ribbon.css({'margin-left': h_offset - w/2})
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return true
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case 'center':
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ribbon.css({'margin-left': h_offset})
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return true
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case 'after':
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ribbon.css({'margin-left': h_offset + w/2})
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return true
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}
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return false
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}
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/* Set the transform-origin to the center of the current view...
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*/
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function centerOrigin(){
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var mt = parseFloat($('.field').css('margin-top'))
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var ml = parseFloat($('.field').css('margin-left'))
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var cml = parseFloat($('.current.ribbon').css('margin-left'))
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var t = parseFloat($('.field').css('top'))
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var l = parseFloat($('.field').css('left'))
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var w = $('.field').width()
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var h = $('.field').height()
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var W = $('.container').width()
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var H = $('.container').height()
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//var ot = mt + H/2 + t
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//var ol = ml + W/2 + l
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var ot = -getCurrentVerticalOffset() + H/2 - t
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var ol = -ml + W/2 - l
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$('.field').css({
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'transform-origin': ol + 'px ' + ot + 'px',
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'-o-transform-origin': ol + 'px ' + ot + 'px',
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'-moz-transform-origin': ol + 'px ' + ot + 'px',
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'-webkit-transform-origin': ol + 'px ' + ot + 'px',
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'-ms-transform-origin': ol + 'px ' + ot + 'px'
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})
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// XXX for debugging...
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$('.origin-marker').css({
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'top': ot,
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'left': ol
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})
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}
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/*********************************************************************/
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// XXX need to make this work for % values...
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// XXX make this usable as an event handler for .resize(...) event...
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function fieldSize(W, H){
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var oW = $('.container').width()
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var oH = $('.container').height()
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var scale = getElementScale($('.field'))
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$('.container').css({
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'width': W,
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'height': H
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})
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// shift the field...
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$('.field').css({
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'margin-top': (parseFloat($('.field').css('margin-top')) + (H-oH)/2),
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'margin-left': (parseFloat($('.field').css('margin-left')) + (W-oW)/2)
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})
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}
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function centerCurrentImage(){
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$('.field')
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.css({
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'top': 0,
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'left': 0
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})
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// do this after animations are done...
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.one("webkitTransitionEnd oTransitionEnd msTransitionEnd transitionend", centerOrigin)
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// this is repeated intentionally...
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// ...needed for small shifts, while the after-animation event
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// is for large moves.
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centerOrigin()
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}
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/*********************************************************************/
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// NOTE: this will only return a single scale value...
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function getElementScale(elem){
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//var transform = elem.css('transform')
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var vendors = ['o', 'moz', 'ms', 'webkit']
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var transform = elem.css('transform')
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var res
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// go through vendor prefixes... (hate this!)
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if(!transform || transform == 'none'){
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for(var i in vendors){
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transform = elem.css('-' + vendors[i] + '-transform')
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if(transform && transform != 'none'){
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break
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}
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}
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}
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// no transform is set...
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if(!transform || transform == 'none'){
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return 1
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}
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// get the scale value -- first argument of scale/matrix...
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return parseFloat((/(scale|matrix)\(([^,]*),.*\)/).exec(transform)[2])
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}
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// XXX
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function setElementScale(elem, scale){
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}
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function scaleContainerBy(factor){
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var scale = getElementScale($('.field'))*factor
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setContainerScale(scale)
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}
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function setContainerScale(scale){
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var H = $('.container').height()
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var W = $('.container').width()
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$('.field').css({
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'transform': 'scale('+scale+', '+scale+')',
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'-moz-transform': 'scale('+scale+', '+scale+')',
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'-o-transform': 'scale('+scale+', '+scale+')',
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'-ms-transform': 'scale('+scale+', '+scale+')',
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'-webkit-transform': 'scale('+scale+', '+scale+')',
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})
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}
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function fitImage(){
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var H = $('.container').height()
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var W = $('.container').width()
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var h = $('.image.current').height()
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var w = $('.image.current').width()
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var f = Math.min(H/h, W/w)
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setContainerScale(f)
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}
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function fitThreeImages(){
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var H = $('.container').height()
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var W = $('.container').width()
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var h = $('.image.current').height()
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// NOTE: this is cheating, need to get actual three widths...
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var w = $('.image.current').width()*3
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var f = Math.min(H/h, W/w)
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setContainerScale(f)
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}
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