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7.6

[HARD !!] Help in zooming to a selected area

Asked by avner in JavaScript

Tags: div, javascript

I've been working for a while on this code and I need a second pair of eyes here.

The idea is as follow :

1. Save the Code in an HTML file.
2. Open in browser.
3. Click the [Drag/Zoom] Icon, change it to Zoom.
4. Click anywhere on the screen and try to zoom into the elephants eye.

You will notice that after 5+ zoom activities, you will lose your target.

Half of the code is a "debug" code, so you can ignore it.

Also, if anyone has a ready made code to receive the same effect (IE5.5+ only) I will consider this as an answer.


------------------------------------------------------------------
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> Blank:Document </TITLE>
<META NAME="Author" CONTENT="(C)Avner Cohen">
<SCRIPT LANGUAGE="JAVASCRIPT">
<!--
var initX="";
var initY="";
var bDrag = true;
var bDoReal = true;
function fillDiv(div,basicStr,counter)
{
var div=document.getElementById(div);
var str="";
for (var i=0;i<counter;i++)
      {
                  str+=basicStr
                  str+=(i%10==0)?" ":"";
      }
div.innerHTML=str;
}

function scrollDiv()
{
      var div=document.getElementById("moshe");
      div.scrollTop=(initY-event.y);
      div.scrollLeft=(initX-event.x);

}

function dragDiv(doEnd)
      {
var div=document.getElementById("moshe");
      if (!doEnd)
                  {
                        initX=event.x+div.scrollLeft;
                        initY=event.y+div.scrollTop;
                        div.onmousemove=scrollDiv
                        event.srcElement.style.cursor="move";
                  }
                  else
                  {
                        div.onmousemove=null
                        event.srcElement.style.cursor="";
                  }
      }

function actionDiv(doEnd)
{
if (bDrag)
      {
            dragDiv(doEnd)
      }
      else
      {
            drawBox(doEnd);
      }
}


var oBox = null;
function drawBox(doEnd)
{
var div=document.getElementById("moshe");
if (!doEnd)
      {
            if (!oBox)
                  {
                  oBox=document.createElement("DIV");
                  document.body.appendChild(oBox);
                  div.onmousemove=drawBox
                  with(oBox.style)
                        {            
                        position="absolute";
                        border="2px dashed";
                        width = "20px";
                        height = "15px";
                        }
                  }
            else //Case that mouse is now moving, drag the size
                  {
                  with(oBox.style)
                        {
                              left = event.x-2
                              top = event.y-2
                        }
                  }
      }
      else if (oBox)
      {
            //Box is up, calculate the center of the box and zoom into it.
            var oImage = div.firstChild;
            var iHeight = parseInt(oBox.offsetHeight);
            var iWidth = parseInt(oBox.offsetWidth);

            var iPosXImage = posX(oImage)
            var iPosYImage = posY(oImage)

            var iPosEvent_X = event.clientX;
            var iPosEvent_Y = event.clientY;

            var iDistanceInImage_X =  event.screenX-  iPosXImage;
            var iDistanceInImage_Y = event.screenY-  iPosYImage;
            
            var iCenter_X = Math.round( iDistanceInImage_X -( iWidth));
            var iCenter_Y = Math.round(iDistanceInImage_Y - (iHeight)) ;

            var iZoomFactor = Math.floor((oImage.style.zoom == "") ? 120 : parseInt(oImage.style.zoom)*1.2 );
            if (iZoomFactor >400)
                  {
                        iZoomFactor = 400
                  }

            //Calculate offset of  (iScrollTo_X/iScrollTo_Y) from center of Image;
            //Center of Image
            var iCenterOfImage_X =  iPosXImage + (oImage.parentNode.offsetWidth/2)
            var iCenterOfImage_Y =  iPosYImage +(oImage.parentNode.offsetHeight/2)
            //distance from posX of Event
            var iDistance_X =  iPosEvent_X - iCenterOfImage_X;
            var iDistance_Y =  iPosEvent_Y - iCenterOfImage_Y;


            //Scroll To Point :
            var iRelativeScrollTop = Math.round( parseInt(div.scrollTop) )   /// (iZoomFactor/100) );
            var iRelativeScrollLeft =  Math.round( parseInt(div.scrollLeft) )  /// (iZoomFactor/100) );


            var iScrollTo_X = iRelativeScrollLeft  + (iDistance_X * -1 ) ;
            var iScrollTo_Y = iRelativeScrollTop  + (iDistance_Y*  -1) ;

            //var iScrollTo_X = (iCenter_X + iRelativeScrollLeft + iDistance_X)  //* (iZoomFactor/100);
            //var iScrollTo_Y = (iCenter_Y + iRelativeScrollTop + iDistance_Y)  // * (iZoomFactor/100) ;

      //var iScrollTo_Y = (event.y + iRelativeScrollTop + iDistance_Y +  iCenter_Y) - (div.offsetHeight/2)
      //var iScrollTo_X = (event.x + iRelativeScrollLeft + iDistance_X +  iCenter_X) - (div.offsetWidth/2)
      
            var oTA = document.getElementById("output");
            oTA.innerText+="\n" +iIndex + ": [X:" + iScrollTo_X+",Y:" +  iScrollTo_Y+"]\n"+iIndex + ": [xdis" + iDistance_X + ",ydis" +iDistance_Y+"]";
                                                      
            
                  xPoint.value = xScroll.value = iScrollTo_X;
                  yPoint.value = yScroll.value = iScrollTo_Y;

            DrawPoint(div, iScrollTo_X, iScrollTo_Y);
            if (bDoReal)
            {
            ScrollTo(div, iScrollTo_X, iScrollTo_Y);
            oImage.style.zoom = iZoomFactor + "%";
            }
            else
            {
            document.getElementById("xShould").innerText = div.scrollTop;
            document.getElementById("yShould").innerText = div.scrollLeft;
            }


//debugger;            
            oBox.parentNode.removeChild(oBox);
                  div.onmousemove=null
                  oBox = null;
            event.srcElement.style.cursor="";
      }
}


function ScrollTo(oParent, x, y )
{
                  oParent.scrollTop = x;
                  oParent.scrollLeft = y;
}

      //Debug
var iIndex = 0;
function DrawPoint(oParent, x, y )
{

            var oPoint  = document.createElement("DIV");
            oPoint.innerText = iIndex;
            with (oPoint.style)
            {
                  fontSize="9px";
                  zIndex=999
                  overflow="hidden";
                  backgroundColor = "yellow";
                  height=oPoint.style.width="10px";
                  position="absolute";
                  left= x  ;
                  top= y;
            }
            oParent.appendChild(oPoint);
++ iIndex;
}

//Debug
function changeDoReal()
{
bDoReal = !bDoReal;
document.getElementById("DoReal").innerText = bDoReal;
}

function changeZoomState(oButton)
{
bDrag = !bDrag;
oButton.innerText = (bDrag) ?"Drag" : "Zoom";
}


function posX(obj)
{
      var curleft = 0;
      while (obj.offsetParent)
      {
            curleft += obj.offsetLeft
            obj = obj.offsetParent;
      }
      return curleft;
}

function posY(obj)
{
      var curtop = 0;
      while (obj.offsetParent)
      {
            curtop += obj.offsetTop
            obj = obj.offsetParent;
      }
      return curtop;
}
-->
</SCRIPT>
</HEAD>

<BODY>
<button onclick ="changeDoReal()" >Do Real</button>[<span id="DoReal">true</span>]<BR>
<button onclick="DrawPoint(document.getElementById('moshe'), xPoint.value, yPoint.value);">Draw Point</button><br>
X <input type="text" style="width:30px" id="xPoint" value="10">, Y <input type="text" style="width:30px" id="yPoint" value="15"><br>
<button onclick="ScrollTo(document.getElementById('moshe'), xScroll.value, yScroll.value);">Scroll To</button><br>
X <input type="text" style="width:30px" id="xScroll" value="10">, Y <input type="text" style="width:30px" id="yScroll" value="15"><br>
Should Be: <br>
X[<span id="xShould"></span>], Y [<span id="yShould"></span>]<br>
<button onclick="changeZoomState(this)">Drag</button>(Drag/Zoom)
<button onclick="document.getElementById('moshe').firstChild.style.zoom=''">Reset Zoom</button><br>
<textarea cols="26" rows="27" id="output"></textarea>
<DIV style="position:absolute;width:395px;height:530px;top:10%;left:30%;background-color:red;overflow:scroll" id="moshe">
<img src="http://www.templetons.com/brad/elephant.jpg"  src1="TIFImage.png"  width="360px" onmousedown="actionDiv()" onmouseup="actionDiv(true)" onselectstart="return false;" ondragstart="return false;">
</DIV><br>
</BODY>
</HTML>




-----------------------------------------------------


Good luck and thanks for the effort.


Regards,
             Avner.


[+][-]12/25/03 01:55 PM, ID: 10000542Accepted Solution

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Zone: JavaScript
Tags: div, javascript
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Solution Provided By: ZeroPage
Participating Experts: 2
Solution Grade: A
 
[+][-]12/23/03 02:03 PM, ID: 9994003Expert Comment

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