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crop.js
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window.canvas_crop = function(img, threshold){
if(!(img instanceof HTMLImageElement)){
alert('not an image element');
return;
}
if(img.width < 40 || img.height < 40){
alert('Very small image, no need to crop');
return;
}
if(!threshold)
var threshold = 20;
var isTouch = 'ontouchstart' in window;
var crop_wrap = document.createElement('div');
var crop_rect = document.createElement('div');
var crop_inner = document.createElement('div');
var crop_canvas = document.createElement('canvas');
crop_canvas.className = 'pcrop_canvas';
crop_canvas.width = img.width;
crop_canvas.height = img.height;
crop_wrap.style.position = 'absolute';
crop_rect.style.position = 'relative';
crop_inner.style.position = 'absolute';
crop_rect.style.boxSizing = crop_wrap.style.boxSizing = 'border-box';
crop_rect.style.webkitBoxSizing = crop_wrap.style.webkitBoxSizing = 'border-box';
crop_rect.style.MozBoxSizing = crop_wrap.style.MozBoxSizing = 'border-box';
var img_bounds = cropimg.getBoundingClientRect();
crop_wrap.style.height = img.height + "px";
crop_wrap.style.width = img.width + "px";
crop_wrap.style.top = (img.offsetTop + (img_bounds.height - img.height)/2) + "px";
crop_wrap.style.left = (img.offsetLeft + (img_bounds.width - img.width)/2) + "px";
crop_wrap.style.borderColor = "rgba(0,0,0,0.4)";
crop_wrap.style.borderStyle = "solid";
crop_wrap.style.borderLeftWidth = crop_wrap.style.borderRightWidth = img.width/4 + "px";
crop_wrap.style.borderTopWidth = crop_wrap.style.borderBottomWidth = img.height/4 + "px";
crop_wrap.style.zIndex = 1;
crop_inner.style.top = threshold + "px";
crop_inner.style.left = threshold + "px";
crop_inner.style.right = threshold + "px";
crop_inner.style.bottom = threshold + "px";
crop_rect.style.width = "100%";
crop_rect.style.height = "100%";
crop_rect.style.border = "2px dotted #f9f9f9";
crop_inner.style.cursor = 'move';
img.parentNode.appendChild(crop_wrap);
//img.parentNode.appendChild(crop_canvas);
crop_wrap.appendChild(crop_rect);
crop_rect.appendChild(crop_inner);
function mouse_down(e){
if(e.targetTouches && e.targetTouches.length)
e = e.targetTouches[0]
var wrap_bounds = crop_wrap.getBoundingClientRect();
var rect_bounds = crop_rect.getBoundingClientRect();
var initialBorderLeftWidth = rect_bounds.left - wrap_bounds.left;
var initialBorderRightWidth = wrap_bounds.right - rect_bounds.right;
var initialBorderTopWidth = rect_bounds.top - wrap_bounds.top;
var initialBorderBottomWidth = wrap_bounds.bottom - rect_bounds.bottom;
var shouldMove = (e.target == crop_inner);
var mouse_move = function(f){
if(f.targetTouches && f.targetTouches.length)
f = f.targetTouches[0]
var x_delta = e.pageX - f.pageX;
var y_delta = e.pageY - f.pageY;
var left_w = initialBorderLeftWidth - x_delta;
var right_w = initialBorderRightWidth + x_delta;
var top_w = initialBorderTopWidth - y_delta;
var bot_w = initialBorderBottomWidth + y_delta;
if(left_w < 0)left_w = 0;
if(right_w < 0)right_w = 0;
if(top_w < 0)top_w = 0;
if(bot_w < 0)bot_w = 0;
if(shouldMove){
var max_w = wrap_bounds.width - rect_bounds.width;
var max_h = wrap_bounds.height - rect_bounds.height;
if(left_w > max_w)
left_w = max_w;
if(right_w > max_w)
right_w = max_w;
if(top_w > max_h)
top_w = max_h;
if(bot_w > max_h)
bot_w = max_h;
crop_wrap.style.borderLeftWidth = left_w + "px";
crop_wrap.style.borderRightWidth = right_w + "px";
crop_wrap.style.borderTopWidth = top_w + "px";
crop_wrap.style.borderBottomWidth = bot_w + "px";
} else {
var offsetX = e.offsetX || e.pageX - rect_bounds.left;
var offsetY = e.offsetY || e.pageY - rect_bounds.top;
if(offsetX < threshold){
if(rect_bounds.width + x_delta < 2 * threshold){
left_w = wrap_bounds.width - initialBorderRightWidth - 2 * threshold;
}
crop_wrap.style.borderLeftWidth = left_w + "px";
}
else if(offsetX > rect_bounds.width - threshold){
if(rect_bounds.width - x_delta < 2 * threshold){
right_w = wrap_bounds.width - initialBorderLeftWidth - 2 * threshold;
}
crop_wrap.style.borderRightWidth = right_w + "px";
}
if(offsetY < threshold){
if(rect_bounds.height + y_delta < 2 * threshold){
top_w = wrap_bounds.height - initialBorderBottomWidth - 2 * threshold;
}
crop_wrap.style.borderTopWidth = top_w + "px";
}
else if(offsetY > rect_bounds.height - threshold){
if(rect_bounds.height - y_delta < 2 * threshold){
bot_w = wrap_bounds.height - initialBorderTopWidth - 2 * threshold;
}
crop_wrap.style.borderBottomWidth = bot_w + "px";
}
}
}
isTouch && document.addEventListener('touchmove', mouse_move);
var mouse_up = function(){
document.removeEventListener('mousemove', mouse_move);
document.removeEventListener('mouseup', mouse_up);
}
document.addEventListener('mousemove', mouse_move);
document.addEventListener('mouseup', mouse_up);
if(isTouch){
var touch_end = function(){
document.removeEventListener('touchmove', mouse_move);
document.removeEventListener('touchend', touch_end);
}
document.addEventListener('touchend',touch_end)
}
}
function cropToCanvas(){
var wrap_bounds = crop_wrap.getBoundingClientRect();
var rect_bounds = crop_rect.getBoundingClientRect();
var left_w = rect_bounds.left - wrap_bounds.left;
var right_w = wrap_bounds.right - rect_bounds.right;
var top_w = rect_bounds.top - wrap_bounds.top;
var bot_w = wrap_bounds.bottom - rect_bounds.bottom;
var wratio = img.naturalWidth/img.width;
var hratio = img.naturalHeight/img.height;
var w = crop_wrap.offsetWidth - left_w - right_w;
var h = crop_wrap.offsetHeight - top_w - bot_w;
crop_canvas.width = w;
crop_canvas.height = h;
crop_canvas.getContext('2d').clearRect(0,0,crop_canvas.width,crop_canvas.height)
crop_canvas.getContext('2d').drawImage(
img,
wratio*left_w,
hratio*top_w,
wratio*(w),
hratio*(h),
0,
0,
w,
h
)
}
function crop_destroy(){
crop_rect.removeEventListener('mousedown', mouse_down);
isTouch && crop_rect.removeEventListener('touchstart', mouse_down);
if(crop_wrap.parentNode)
crop_wrap.parentNode.removeChild(crop_wrap);
}
crop_rect.addEventListener('mousedown', mouse_down);
isTouch && crop_rect.addEventListener('touchstart', mouse_down);
return {
cropToCanvas : cropToCanvas,
destroy : crop_destroy,
canvasEl : crop_canvas,
cropEl : crop_wrap,
cropRect : crop_rect,
cropInner : crop_inner
}
}