Well, thanks for that, but what I'm looking for is just for a solution in regards to the zooming part, the box itself is fine.
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Question
[HARD !!] Help in zooming to a selected area
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,count
{
var div=document.getElementByI
var str="";
for (var i=0;i<counter;i++)
{
str+=basicStr
str+=(i%10==0)?" ":"";
}
div.innerHTML=str;
}
function scrollDiv()
{
var div=document.getElementByI
div.scrollTop=(initY-event
div.scrollLeft=(initX-even
}
function dragDiv(doEnd)
{
var div=document.getElementByI
if (!doEnd)
{
initX=event.x+div.scrollLe
initY=event.y+div.scrollTo
div.onmousemove=scrollDiv
event.srcElement.style.cur
}
else
{
div.onmousemove=null
event.srcElement.style.cur
}
}
function actionDiv(doEnd)
{
if (bDrag)
{
dragDiv(doEnd)
}
else
{
drawBox(doEnd);
}
}
var oBox = null;
function drawBox(doEnd)
{
var div=document.getElementByI
if (!doEnd)
{
if (!oBox)
{
oBox=document.createElemen
document.body.appendChild(
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(iDistanceInImag
var iZoomFactor = Math.floor((oImage.style.z
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.offsetW
var iCenterOfImage_Y = iPosYImage +(oImage.parentNode.offset
//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("o
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("x
document.getElementById("y
}
//debugger;
oBox.parentNode.removeChil
div.onmousemove=null
oBox = null;
event.srcElement.style.cur
}
}
function ScrollTo(oParent, x, y )
{
oParent.scrollTop = x;
oParent.scrollLeft = y;
}
//Debug
var iIndex = 0;
function DrawPoint(oParent, x, y )
{
var oPoint = document.createElement("DI
oPoint.innerText = iIndex;
with (oPoint.style)
{
fontSize="9px";
zIndex=999
overflow="hidden";
backgroundColor = "yellow";
height=oPoint.style.width=
position="absolute";
left= x ;
top= y;
}
oParent.appendChild(oPoint
++ iIndex;
}
//Debug
function changeDoReal()
{
bDoReal = !bDoReal;
document.getElementById("D
}
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>]<B
<button onclick="DrawPoint(documen
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
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(t
<button onclick="document.getEleme
<textarea cols="26" rows="27" id="output"></textarea>
<DIV style="position:absolute;w
<img src="http://www.templetons
</DIV><br>
</BODY>
</HTML>
--------------------------
Good luck and thanks for the effort.
Regards,
Avner.
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Answers
The ScrollTo function is swapping x and y coordinates.
Change it to this:
function ScrollTo(oParent, x, y ) {
oParent.scrollLeft = x;
oParent.scrollTop = y;
}
Also reduce your zooming function to this:
var oBox = null;
function drawBox(doEnd) {
var div=document.getElementByI
if (!doEnd) {
if (!oBox) {
oBox=document.createElemen
//document.body.appendChil
div.appendChild(oBox);
oBox.shiftX = event.x+div.scrollLeft;
oBox.shiftY = event.y+div.scrollTop;
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-div.offsetLeft+div
top = event.y-div.offsetTop+div.
}
}
} else if (oBox) {
//Box is up, calculate the center of the box and zoom into it.
var oImage = div.firstChild;
var divH = parseInt(div.offsetHeight)
var divW = parseInt(div.offsetWidth);
var boxH = parseInt(oBox.offsetHeight
var boxW = parseInt(oBox.offsetWidth)
var boxX = oBox.offsetLeft;
var boxY = oBox.offsetTop;
var imgX = oImage.offsetLeft;
var imgY = oImage.offsetTop;
var boxCenter_X = Math.round(boxX + (boxW/2));
var boxCenter_Y = Math.round(boxY + (boxH/2));
var oZoomFactor = Math.floor((oImage.style.z
var nZoomFactor = Math.floor(oZoomFactor * 1.2);
if (nZoomFactor > 400) {
nZoomFactor = 400
}
//Scroll To Point :
var newBoxCenterX = Math.round(boxCenter_X / oZoomFactor * nZoomFactor)
var newBoxCenterY = Math.round(boxCenter_Y / oZoomFactor * nZoomFactor)
var divScrollTo_X = Math.round(newBoxCenterX - (divW / 2));
var divScrollTo_Y = Math.round(newBoxCenterY - (divH / 2));
if(divScrollTo_X<0) divScrollTo_X = 0;
if(divScrollTo_Y<0) divScrollTo_Y = 0;
var theForm = document.forms[0];
var oTA = theForm.output;
oTA.value +="\n" +iIndex + ": [X:" + divScrollTo_X+",Y:" + divScrollTo_Y+"]\n"+iIndex
theForm.xPoint.value = theForm.xScroll.value = divScrollTo_X;
theForm.yPoint.value = theForm.yScroll.value = divScrollTo_Y;
DrawPoint(div, newBoxCenterX, newBoxCenterY);
if (bDoReal) {
ScrollTo(div, divScrollTo_X, divScrollTo_Y);
oImage.style.zoom = nZoomFactor + "%";
} else {
document.getElementById("x
document.getElementById("y
}
//debugger;
oBox.parentNode.removeChil
div.onmousemove=null
oBox = null;
event.srcElement.style.cur
}
}
Add <form> and </form> inside of your <body> section and replace innerText by innerHTML.
Good luck,
ZeroPage
Uhps, the oBox initialization missed the x and y coordinates.
So here the revised function:
var oBox = null;
function drawBox(doEnd) {
var div=document.getElementByI
if (!doEnd) {
if (!oBox) {
oBox=document.createElemen
//document.body.appendChil
div.appendChild(oBox);
div.onmousemove=drawBox
with(oBox.style) {
position="absolute";
border="2px dashed";
width = "20px";
height = "15px";
left = event.x-div.offsetLeft+div
top = event.y-div.offsetTop+div.
}
} else {//Case that mouse is now moving, drag the size
with(oBox.style) {
left = event.x-div.offsetLeft+div
top = event.y-div.offsetTop+div.
}
}
} else if (oBox) {
//Box is up, calculate the center of the box and zoom into it.
var oImage = div.firstChild;
var divH = parseInt(div.offsetHeight)
var divW = parseInt(div.offsetWidth);
var boxH = parseInt(oBox.offsetHeight
var boxW = parseInt(oBox.offsetWidth)
var boxX = oBox.offsetLeft;
var boxY = oBox.offsetTop;
var imgX = oImage.offsetLeft;
var imgY = oImage.offsetTop;
var boxCenter_X = Math.round(boxX + (boxW/2));
var boxCenter_Y = Math.round(boxY + (boxH/2));
var oZoomFactor = Math.floor((oImage.style.z
var nZoomFactor = Math.floor(oZoomFactor * 1.2);
if (nZoomFactor > 400) {
nZoomFactor = 400
}
//Scroll To Point :
var newBoxCenterX = Math.round(boxCenter_X / oZoomFactor * nZoomFactor)
var newBoxCenterY = Math.round(boxCenter_Y / oZoomFactor * nZoomFactor)
var divScrollTo_X = Math.round(newBoxCenterX - (divW / 2));
var divScrollTo_Y = Math.round(newBoxCenterY - (divH / 2));
if(divScrollTo_X<0) divScrollTo_X = 0;
if(divScrollTo_Y<0) divScrollTo_Y = 0;
var theForm = document.forms[0];
var oTA = theForm.output;
oTA.value +="\n" +iIndex + ": [X:" + divScrollTo_X+",Y:" + divScrollTo_Y+"]\n"+iIndex
theForm.xPoint.value = theForm.xScroll.value = divScrollTo_X;
theForm.yPoint.value = theForm.yScroll.value = divScrollTo_Y;
DrawPoint(div, newBoxCenterX, newBoxCenterY);
if (bDoReal) {
ScrollTo(div, divScrollTo_X, divScrollTo_Y);
oImage.style.zoom = nZoomFactor + "%";
} else {
document.getElementById("x
document.getElementById("y
}
//debugger;
oBox.parentNode.removeChil
div.onmousemove=null
oBox = null;
event.srcElement.style.cur
}
}
ZeroPage,
I removed some debugging parts from my code, here is your full version, and it still does not work :
<!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 scrollDiv()
{
var div=document.getElementByI
div.scrollTop=(initY-event
div.scrollLeft=(initX-even
}
function dragDiv(doEnd)
{
var div=document.getElementByI
if (!doEnd)
{
initX=event.x+div.scrollLe
initY=event.y+div.scrollTo
div.onmousemove=scrollDiv
event.srcElement.style.cur
}
else
{
div.onmousemove=null
event.srcElement.style.cur
}
}
function actionDiv(doEnd)
{
if (bDrag)
{
dragDiv(doEnd)
}
else
{
drawBox(doEnd);
}
}
var oBox = null;
function drawBox(doEnd) {
var div=document.getElementByI
if (!doEnd) {
if (!oBox) {
oBox=document.createElemen
//document.body.appendChil
div.appendChild(oBox);
div.onmousemove=drawBox
with(oBox.style) {
position="absolute";
border="2px dashed";
width = "20px";
height = "15px";
left = event.x-div.offsetLeft+div
top = event.y-div.offsetTop+div.
}
} else {//Case that mouse is now moving, drag the size
with(oBox.style) {
left = event.x-div.offsetLeft+div
top = event.y-div.offsetTop+div.
}
}
} else if (oBox) {
//Box is up, calculate the center of the box and zoom into it.
var oImage = div.firstChild;
var divH = parseInt(div.offsetHeight)
var divW = parseInt(div.offsetWidth);
var boxH = parseInt(oBox.offsetHeight
var boxW = parseInt(oBox.offsetWidth)
var boxX = oBox.offsetLeft;
var boxY = oBox.offsetTop;
var imgX = oImage.offsetLeft;
var imgY = oImage.offsetTop;
var boxCenter_X = Math.round(boxX + (boxW/2));
var boxCenter_Y = Math.round(boxY + (boxH/2));
var oZoomFactor = Math.floor((oImage.style.z
var nZoomFactor = Math.floor(oZoomFactor * 1.2);
if (nZoomFactor > 400) {
nZoomFactor = 400
}
//Scroll To Point :
var newBoxCenterX = Math.round(boxCenter_X / oZoomFactor * nZoomFactor)
var newBoxCenterY = Math.round(boxCenter_Y / oZoomFactor * nZoomFactor)
var divScrollTo_X = Math.round(newBoxCenterX - (divW / 2));
var divScrollTo_Y = Math.round(newBoxCenterY - (divH / 2));
if(divScrollTo_X<0) divScrollTo_X = 0;
if(divScrollTo_Y<0) divScrollTo_Y = 0;
var theForm = document.forms[0];
DrawPoint(div, newBoxCenterX, newBoxCenterY);
if (bDoReal) {
ScrollTo(div, divScrollTo_X, divScrollTo_Y);
oImage.style.zoom = nZoomFactor + "%";
} else {
}
//debugger;
oBox.parentNode.removeChil
div.onmousemove=null
oBox = null;
event.srcElement.style.cur
}
}
function ScrollTo(oParent, x, y )
{
oParent.scrollTop = x;
oParent.scrollLeft = y;
}
//Debug
var iIndex = 0;
function DrawPoint(oParent, x, y )
{
var oPoint = document.createElement("DI
oPoint.innerText = iIndex;
with (oPoint.style)
{
fontSize="9px";
zIndex=999
overflow="hidden";
backgroundColor = "yellow";
height=oPoint.style.width=
position="absolute";
left= x ;
top= y;
}
oParent.appendChild(oPoint
++ iIndex;
}
//Debug
function changeDoReal()
{
bDoReal = !bDoReal;
document.getElementById("D
}
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="changeZoomState(t
<button onclick="document.getEleme
<DIV style="position:absolute;w
<img src1="http://www.templeton
</DIV><br>
</BODY>
</HTML>
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by: PurplePerlsPosted on 2003-12-23 at 14:03:09ID: 9994003
Hello,
I do not know if that helps you, but I would change the relationship of your small box to this:
function drawBox(doEnd)
{
var div=document.getElementByI
if (!doEnd)
{
if (!oBox)
{
oBox=document.createElemen
//document.body.appendChil
div.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-div.offsetLeft+div
top = event.y-div.offsetTop+div.
}
}
}...