Crop an image : Drag Drop « GUI Components « JavaScript DHTML






Crop an image

 /* dom-drag.js 09.25.2001 www.youngpup.net
  10.28.2001 - fixed minor bug where events
  sometimes fired off the handle, not the root.
*/

<html><head><title>- cropper -</title>

<style type="text/css">
<!--
html, body {
  height:100%;
  padding:0;
  margin:0;
  background:white;
  font:11px verdana;
  }

body {
  margin:15px 40px;
  }

#banner {
  position:absolute;
  top:0px; left:0px;
  height:100%;
  width:19px;
  background:black url(http://youngpup.net/img/logo.gif) top left no-repeat;
  }

h1 {
  font:11px verdana;
  font-weight:bold;
  margin-top:0;
  margin-bottom:1em;
  color:#FB3B00;
  }

#pbox {
    width:300px; height:300px;
    overflow:hidden;
  }
.opacity{filter: alpha(opacity=60)}
-->
</style>
<script language="javascript">
/**************************************************
 * dom-drag.js
 * 09.25.2001
 * www.youngpup.net
 **************************************************
 * 10.28.2001 - fixed minor bug where events
 * sometimes fired off the handle, not the root.
 **************************************************/

var Drag = {

  obj : null,

  init : function(o, oRoot, minX, maxX, minY, maxY, bSwapHorzRef, bSwapVertRef, fXMapper, fYMapper)
  {
    o.onmousedown  = Drag.start;

    o.hmode      = bSwapHorzRef ? false : true ;
    o.vmode      = bSwapVertRef ? false : true ;

    o.root = oRoot && oRoot != null ? oRoot : o ;

    if (o.hmode  && isNaN(parseInt(o.root.style.left  ))) o.root.style.left   = "0px";
    if (o.vmode  && isNaN(parseInt(o.root.style.top   ))) o.root.style.top    = "0px";
    if (!o.hmode && isNaN(parseInt(o.root.style.right ))) o.root.style.right  = "0px";
    if (!o.vmode && isNaN(parseInt(o.root.style.bottom))) o.root.style.bottom = "0px";

    o.minX  = typeof minX != 'undefined' ? minX : null;
    o.minY  = typeof minY != 'undefined' ? minY : null;
    o.maxX  = typeof maxX != 'undefined' ? maxX : null;
    o.maxY  = typeof maxY != 'undefined' ? maxY : null;

    o.xMapper = fXMapper ? fXMapper : null;
    o.yMapper = fYMapper ? fYMapper : null;

    o.root.onDragStart  = new Function();
    o.root.onDragEnd  = new Function();
    o.root.onDrag    = new Function();
  },

  start : function(e)
  {
    var o = Drag.obj = this;
    e = Drag.fixE(e);
    var y = parseInt(o.vmode ? o.root.style.top  : o.root.style.bottom);
    var x = parseInt(o.hmode ? o.root.style.left : o.root.style.right );
    o.root.onDragStart(x, y);

    o.lastMouseX  = e.clientX;
    o.lastMouseY  = e.clientY;

    if (o.hmode) {
      if (o.minX != null)  o.minMouseX  = e.clientX - x + o.minX;
      if (o.maxX != null)  o.maxMouseX  = o.minMouseX + o.maxX - o.minX;
    } else {
      if (o.minX != null) o.maxMouseX = -o.minX + e.clientX + x;
      if (o.maxX != null) o.minMouseX = -o.maxX + e.clientX + x;
    }

    if (o.vmode) {
      if (o.minY != null)  o.minMouseY  = e.clientY - y + o.minY;
      if (o.maxY != null)  o.maxMouseY  = o.minMouseY + o.maxY - o.minY;
    } else {
      if (o.minY != null) o.maxMouseY = -o.minY + e.clientY + y;
      if (o.maxY != null) o.minMouseY = -o.maxY + e.clientY + y;
    }

    document.onmousemove  = Drag.drag;
    document.onmouseup    = Drag.end;

    return false;
  },

  drag : function(e)
  {
    e = Drag.fixE(e);
    var o = Drag.obj;

    var ey  = e.clientY;
    var ex  = e.clientX;
    var y = parseInt(o.vmode ? o.root.style.top  : o.root.style.bottom);
    var x = parseInt(o.hmode ? o.root.style.left : o.root.style.right );
    var nx, ny;

    if (o.minX != null) ex = o.hmode ? Math.max(ex, o.minMouseX) : Math.min(ex, o.maxMouseX);
    if (o.maxX != null) ex = o.hmode ? Math.min(ex, o.maxMouseX) : Math.max(ex, o.minMouseX);
    if (o.minY != null) ey = o.vmode ? Math.max(ey, o.minMouseY) : Math.min(ey, o.maxMouseY);
    if (o.maxY != null) ey = o.vmode ? Math.min(ey, o.maxMouseY) : Math.max(ey, o.minMouseY);

    nx = x + ((ex - o.lastMouseX) * (o.hmode ? 1 : -1));
    ny = y + ((ey - o.lastMouseY) * (o.vmode ? 1 : -1));

    if (o.xMapper)    nx = o.xMapper(y)
    else if (o.yMapper)  ny = o.yMapper(x)

    Drag.obj.root.style[o.hmode ? "left" : "right"] = nx + "px";
    Drag.obj.root.style[o.vmode ? "top" : "bottom"] = ny + "px";
    Drag.obj.lastMouseX  = ex;
    Drag.obj.lastMouseY  = ey;

    Drag.obj.root.onDrag(nx, ny);
    return false;
  },

  end : function()
  {
    document.onmousemove = null;
    document.onmouseup   = null;
    Drag.obj.root.onDragEnd(  parseInt(Drag.obj.root.style[Drag.obj.hmode ? "left" : "right"]), 
                  parseInt(Drag.obj.root.style[Drag.obj.vmode ? "top" : "bottom"]));
    Drag.obj = null;
  },

  fixE : function(e)
  {
    if (typeof e == 'undefined') e = window.event;
    if (typeof e.layerX == 'undefined') e.layerX = e.offsetX;
    if (typeof e.layerY == 'undefined') e.layerY = e.offsetY;
    return e;
  }
};
</script>
<script language="javascript">
  var oThang, oHandle, reportBox, iReportCount = 0;

  window.onload = function() {
    if (document.all || document.getElementById)
    {
      oThang = document.all ? document.all["thang"] : document.getElementById("thang")
      oHandle = document.all ? document.all["handle"] : document.getElementById("handle")
      oReport = document.all ? document.all["report"] : document.getElementById("report")

      Drag.init(oHandle, oThang, -250, -50, -250, -50);

      // report stuff
      oThang.onDrag = function(x, y) { reportDrag("", x, y); }
    }

    function reportDrag(who, x, y) {
      oReport.value = who + "" + " X = " + (x + 250) + " Y = " + (y + 250) + " W = 100 H = 100"
    }

    oThang.onDrag(-250, -250);
  }
</script></head>
<body>
<div id="banner"></div>
<h1>DOM-Drag Examples: Cropper</h1>
<div style="width: 300px; height: 300px; overflow: hidden; top: 20px; left: 20px;">
  <img src="snare_pic_large-300.jpg">
  <div id="thang" style="position: absolute; left: -109px; top: -190px;">
    <img class="opacity" style="position: absolute; left: 0px; top: 0px;" src="selection2.gif">
    <img id="handle" style="position: absolute; left: 250px; top: 250px; width: 100px; height: 100px;" src="x.gif">
  </div>
</div>

<input id="report" style="width: 300px;" type="text">

<p>this was <a href="http://www.styrofirm.com/" target="_blank">jody's</a> idea.</p>

</body></html>

           
       








Crop.zip( 48 k)

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