javascript - Crop content from document and scale cropped area to another div -


my objective on 1 able crop part of html document (the image, white background) , able scale same cropped area red square in bottom of fiddle. it's final step build snipping tool (this merely experiment web tools) , in need of final push now, can't seem solve without use of existent repositories. wouldn't point of trying after all. help, idea? feel free edit fiddle ofc

html

<div id="selection_box"></div> <img src="http://popcultureblog.dallasnews.com/files/2012/10/norah1bynoahabrams_27933966.jpeg" id="image_box"> <div id="captured_box"></div>

javasctipt

function getcursorposition(e) {     e = e || window.event;     if (e) {         if (e.pagex || e.pagex == 0) return [e.pagex, e.pagey];         var de = document.documentelement || {};         var db = document.body || {};         if ((e.clientx || e.clientx == 0) && ((db.scrollleft || db.scrollleft == 0) || (de.clientleft || de.clientleft == 0))) return [e.clientx + (de.scrollleft || db.scrollleft || 0) - (de.clientleft || 0), e.clienty + (de.scrolltop || db.scrolltop || 0) - (de.clienttop || 0)];     }     return null; }  function mousedown(e) {     var mxy = getcursorposition(e);     var box = document.getelementbyid("selection_box");     box.orig_x = mxy[0];     box.orig_y = mxy[1];     box.style.left = mxy[0] + "px";     box.style.top = mxy[1] + "px";     box.style.display = "block";     document.onmousemove = mousemove;     document.onmouseup = mouseup; }  function mousemove(e) {     var mxy = getcursorposition(e);     var box = document.getelementbyid("selection_box");     box.style.width = (mxy[0] - box.orig_x) + "px";     box.style.height = (mxy[1] - box.orig_y) + "px"; }  function mouseup(e) {     var mxy = getcursorposition(e),         box = document.getelementbyid("selection_box"),         image_box = document.getelementbyid("image_box"),         selection = getselection;     box.style.display = "none";     box.style.width = "0";     box.style.height = "0";     document.onmousemove = function () {};     document.onmouseup = function () {}; }    document.onmousedown = mousedown;

css

* {     -moz-user-select: none;     -webkit-user-select: none; } #selection_box {     -webkit-animation: blackwhite 3s infinite;     display: none;     position: absolute;     border: 1px dashed #000000;     background: transparent;     width: 0;     height: 0;     z-index: 1; } @-webkit-keyframes blackwhite {     40% {         border-color:white;     }     100% {         border-color:black;     } } #image_box {     position: absolute;     top: 75px;     width: 700px;     height: 370px; } #captured_box {     position: absolute;     top: 500px;     left: 100px;     width: 100px;     height: 100px;     background-color: red; }

this should fix problems of realisation(here mouse can go left , click point.)

    function mousemove(e) {     var mxy = getcursorposition(e);     var box = document.getelementbyid("selection_box");     var right=mxy[0]>box.orig_x;     var left=!right;     var up=mxy[1]<box.orig_y;     var down=!up;       if(up &&  right){     box.style.top = mxy[1] + "px";     }      else if(up && left){     box.style.left = mxy[0] + "px";     box.style.top = mxy[1] + "px";     }      else if(down && left){     box.style.left = mxy[0] + "px";     box.style.top = mxy[1] - "px";     }      box.style.width = (math.abs(mxy[0] - box.orig_x)) + "px";     box.style.height = (math.abs(mxy[1] - box.orig_y)) + "px"; }

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