Uncle JIms Web Designs: Smart image resizer

Uncle Jim's Web Designs: Dynamically Resizing Pictures by Peter Gehrig
INSTRUCTIONS: Drag the grey handle on the right bottom corner of the picture to test the resize function.

INSTALLATION INSTRUCTIONS

COPY - Insert Between Head Tags: <HEAD></HEAD>

<SCRIPT LANGUAGE="JavaScript">
// CREDITS:
// Smart image resizer script by Urs Dudli and Peter Gehrig 
// Copyright (c) 2000 Peter Gehrig and Urs Dudli. All rights reserved.
// Permission given to use the script provided that this notice remains as is.

var imgsrc="girl201.jpg"
var resizeimg_width=480
var resizeimg_height=280
var resizeimg_startx=10
var resizeimg_starty=10
var startsize=4
var gripimg_startx=Math.ceil(resizeimg_width/startsize)+resizeimg_startx-15
var gripimg_starty=Math.ceil(resizeimg_height/startsize)+resizeimg_starty-15
var isNav, isIE
var offsetX, offsetY
var selectedObj

if (parseInt(navigator.appVersion) >= 4) {
	if (navigator.appName == "Netscape") {
		isNav = true
	} else {
		isIE = true
	}
}

function setZIndex(obj, zOrder) {
	obj.zIndex = zOrder
}

function shiftTo(obj, x, y) {
	if (isNav) {
		if (document.layers) {
		document.resizeimagediv.document.write("<img src="+imgsrc+" width="+(-resizeimg_startx+x+15)+" height="+(-resizeimg_starty+y+15)+">")
		document.resizeimagediv.document.close()
		}
		document.gripimagediv.left=x
		document.gripimagediv.top=y
	}
	else {
		resizeimagediv.innerHTML="<img src="+imgsrc+" width="+(-resizeimg_startx+x+15)+" height="+(-resizeimg_starty+y+15)+">"
		document.all.gripimagediv.style.posLeft=x
		document.all.gripimagediv.style.posTop=y
	}
}

function setSelectedElem(evt) {
	if (isNav) {
		var testObj
		var clickX = evt.pageX
		var clickY = evt.pageY
		for (var i = document.layers.length - 1; i >= 0; i--) {
			testObj = document.layers[i]
			if ((clickX > testObj.left) && 
				(clickX < testObj.left + testObj.clip.width) && 
				(clickY > testObj.top) && 
				(clickY < testObj.top + testObj.clip.height) && (testObj.name=="gripimagediv")) {
					selectedObj = testObj
					setZIndex(selectedObj, 100)
					return
			}
		}
	} else {
		var imgObj = window.event.srcElement
		if (imgObj.parentElement.id.indexOf("gripimage") != -1) {
			selectedObj = imgObj.parentElement.style
			setZIndex(selectedObj,100)
			return
		}
	}
	selectedObj = null
	return
}

function dragIt(evt) {
	if (selectedObj) {
		if (isNav) {
			shiftTo(selectedObj, (evt.pageX - offsetX), (evt.pageY - offsetY))
		} else {
			shiftTo(selectedObj, (window.event.clientX - offsetX), (window.event.clientY - offsetY))
			return false
		}
	}
}

function engage(evt) {
	setSelectedElem(evt)
	if (selectedObj) {
		if (isNav) {
			offsetX = evt.pageX - selectedObj.left
			offsetY = evt.pageY - selectedObj.top
		} else {
			offsetX = window.event.offsetX
			offsetY = window.event.offsetY
		}
	}
	return false
}

function release(evt) {
	if (selectedObj) {
		setZIndex(selectedObj, 0)
		selectedObj = null
	}
}

function setNavEventCapture() {
	if (isNav) {
		document.captureEvents(Event.MOUSEDOWN | Event.MOUSEMOVE | Event.MOUSEUP)
	}
}

function init() {
	if (isNav) {
		setNavEventCapture()
	}
	document.onmousedown = engage
	document.onmousemove = dragIt
	document.onmouseup = release
	if (document.all) {
		resizeimagediv.innerHTML="<img src="+imgsrc+" width="+Math.ceil(resizeimg_width/startsize)+">"
		document.all.resizeimagediv.style.posLeft=resizeimg_startx
		document.all.resizeimagediv.style.posTop=resizeimg_starty
		document.all.gripimagediv.style.posLeft=gripimg_startx
		document.all.gripimagediv.style.posTop=gripimg_starty
	}
	
	if (document.layers) {
		document.resizeimagediv.document.write("<img src="+imgsrc+" width="+Math.ceil(resizeimg_width/startsize)+">")
		document.resizeimagediv.document.close()
		document.resizeimagediv.left=resizeimg_startx
		document.resizeimagediv.top=resizeimg_starty
		document.gripimagediv.left=gripimg_startx
		document.gripimagediv.top=gripimg_starty
	}
}
// - End of JavaScript - -->
</SCRIPT>

COPY - Insert Inside Body: <BODY></BODY>

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