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jquery.jWindowCrop.js
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jquery.jWindowCrop.js
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/*
* jWindowCrop v1.0.0
*
* Copyright (c) 2012 Tyler Brown
* Licensed under the MIT license.
*
*/
(function($){
function fillContainer(val, targetLength, containerLength) { // ensure that no gaps are between target's edges and container's edges
if(val + targetLength < containerLength) val = containerLength-targetLength;
if(val > 0) val = 0;
return val;
}
$.jWindowCrop = function(image, options){
var base = this;
base.$image = $(image); // target image jquery element
base.image = image; // target image dom element
base.$image.data("jWindowCrop", base); // target frame jquery element
base.namespace = 'jWindowCrop';
base.originalWidth = 0;
base.isDragging = false;
base.init = function(){
base.$image.css({display:'none'}); // hide image until loaded
base.options = $.extend({},$.jWindowCrop.defaultOptions, options);
if(base.options.zoomSteps < 2) base.options.zoomSteps = 2;
base.$image.addClass('jwc_image').wrap('<div class="jwc_frame" />'); // wrap image in frame
base.$frame = base.$image.parent();
base.$frame.append('<div class="jwc_loader">' + base.options.loadingText + '</div>');
base.$frame.append('<div class="jwc_controls" style="display:'+(base.options.showControlsOnStart ? 'block' : 'none')+';"><span>click to drag</span><a href="#" class="jwc_zoom_in"></a><a href="#" class="jwc_zoom_out"></a></div>');
base.$frame.css({'overflow': 'hidden', 'position': 'relative', 'width': base.options.targetWidth, 'height': base.options.targetHeight});
base.$image.css({'position': 'absolute', 'top': '0px', 'left': '0px'});
initializeDimensions();
base.$frame.find('.jwc_zoom_in').on('click.'+base.namespace, base.zoomIn);
base.$frame.find('.jwc_zoom_out').on('click.'+base.namespace, base.zoomOut);
base.$frame.on('mouseenter.'+base.namespace, handleMouseEnter);
base.$frame.on('mouseleave.'+base.namespace, handleMouseLeave);
base.$image.on('load.'+base.namespace, handeImageLoad);
base.$image.on('mousedown.'+base.namespace+' touchstart.'+base.namespace, handleMouseDown);
$(document).on('mousemove.'+base.namespace+' touchmove.'+base.namespace, handleMouseMove);
$(document).on('mouseup.'+base.namespace+' touchend.'+base.namespace, handleMouseUp);
};
base.destroy = function() {
base.$image.removeData("jWindowCrop"); // remove data
$(document).unbind('mousemove.'+base.namespace+' touchmove.'+base.namespace); // remove body binds
$(document).unbind('mouseup.'+base.namespace+' touchend.'+base.namespace); // remove body binds
base.$image.unbind(); // remove image binds
base.$frame.unbind(); // remove frame binds
base.$frame.find('.jwc_zoom_out').unbind(); // remove zoom triggers
base.$frame.find('.jwc_zoom_in').unbind(); // remove zoom triggers
$('.jwc_loader').remove(); // remove the added text
$('.jwc_controls').remove(); // remove the added controls
base.$image.removeAttr( 'style' ); // undo the style
base.$image.unwrap(); // undo the wrap
};
base.setZoom = function(percent) {
if(base.minPercent >= 1) {
percent = base.minPercent;
} else if(percent > 1.0) {
percent = 1;
} else if(percent < base.minPercent) {
percent = base.minPercent;
}
base.$image.width(Math.ceil(base.originalWidth*percent));
base.workingPercent = percent;
focusOnCenter();
updateResult();
};
base.zoomIn = function() {
var zoomIncrement = (1.0 - base.minPercent) / (base.options.zoomSteps-1);
base.setZoom(base.workingPercent+zoomIncrement);
return false;
};
base.zoomOut = function() {
var zoomIncrement = (1.0 - base.minPercent) / (base.options.zoomSteps-1);
base.setZoom(base.workingPercent-zoomIncrement);
return false;
};
function initializeDimensions() {
if(base.originalWidth == 0) {
base.originalWidth = base.$image.width();
base.originalHeight = base.$image.height();
}
if(base.originalWidth > 0) {
var widthRatio = base.options.targetWidth / base.originalWidth;
var heightRatio = base.options.targetHeight / base.originalHeight;
//base.minPercent = (widthRatio >= heightRatio) ? widthRatio : heightRatio;
if(widthRatio >= heightRatio) {
base.minPercent = (base.originalWidth < base.options.targetWidth) ? (base.options.targetWidth / base.originalWidth) : widthRatio;
} else {
base.minPercent = (base.originalHeight < base.options.targetHeight) ? (base.options.targetHeight / base.originalHeight) : heightRatio;
}
base.focalPoint = {'x': Math.round(base.originalWidth/2), 'y': Math.round(base.originalHeight/2)};
base.setZoom(base.minPercent);
base.$image.fadeIn('fast'); //display image now that it has loaded
}
}
function storeFocalPoint() {
var x = (parseInt(base.$image.css('left'))*-1 + base.options.targetWidth/2) / base.workingPercent;
var y = (parseInt(base.$image.css('top'))*-1 + base.options.targetHeight/2) / base.workingPercent;
base.focalPoint = {'x': Math.round(x), 'y': Math.round(y)};
}
function focusOnCenter() {
var left = fillContainer((Math.round((base.focalPoint.x*base.workingPercent) - base.options.targetWidth/2)*-1), base.$image.width(), base.options.targetWidth);
var top = fillContainer((Math.round((base.focalPoint.y*base.workingPercent) - base.options.targetHeight/2)*-1), base.$image.height(), base.options.targetHeight);
base.$image.css({'left': (left.toString()+'px'), 'top': (top.toString()+'px')})
storeFocalPoint();
}
function updateResult() {
base.result = {
cropX: Math.floor(parseInt(base.$image.css('left'))/base.workingPercent*-1),
cropY: Math.floor(parseInt(base.$image.css('top'))/base.workingPercent*-1),
cropW: Math.round(base.options.targetWidth/base.workingPercent),
cropH: Math.round(base.options.targetHeight/base.workingPercent),
mustStretch: (base.minPercent > 1)
};
base.options.onChange.call(base.image, base.result);
}
function handeImageLoad() {
initializeDimensions();
}
function handleMouseDown(event) {
event.preventDefault(); //some browsers do image dragging themselves
base.isDragging = true;
base.dragMouseCoords = {x: event.pageX || event.originalEvent.touches[0].pageX, y: event.pageY || event.originalEvent.touches[0].pageY};
base.dragImageCoords = {x: parseInt(base.$image.css('left')), y: parseInt(base.$image.css('top'))}
}
function handleMouseUp() {
base.isDragging = false;
}
function handleMouseMove(event) {
if(base.isDragging) {
var xDif = (event.pageX || event.originalEvent.touches[0].pageX) - base.dragMouseCoords.x;
var yDif = (event.pageY || event.originalEvent.touches[0].pageY) - base.dragMouseCoords.y;
var newLeft = fillContainer((base.dragImageCoords.x + xDif), base.$image.width(), base.options.targetWidth);
var newTop = fillContainer((base.dragImageCoords.y + yDif), base.$image.height(), base.options.targetHeight);
base.$image.css({'left' : (newLeft.toString()+'px'), 'top' : (newTop.toString()+'px')});
storeFocalPoint();
updateResult();
}
}
function handleMouseEnter() {
if(base.options.smartControls) base.$frame.find('.jwc_controls').fadeIn('fast');
}
function handleMouseLeave() {
if(base.options.smartControls) base.$frame.find('.jwc_controls').fadeOut('fast');
}
base.init();
};
$.jWindowCrop.defaultOptions = {
targetWidth: 320,
targetHeight: 180,
zoomSteps: 10,
loadingText: 'Loading...',
smartControls: true,
showControlsOnStart: true,
onChange: function() {}
};
$.fn.jWindowCrop = function(options){
return this.each(function(){
(new $.jWindowCrop(this, options));
});
};
$.fn.getjWindowCrop = function(){
return this.data("jWindowCrop");
};
})(jQuery);