MY0871——动态光圈

查看效果

提示:此动态光圈脚本效果类似flash，但非flash！

将下面的代码复制到<head> 内

/*** Variables to set ***/
sCircleWidth = 168	//The width the script will clip to
sCircleHeight = 168	//The height the script will clip to
sStarty = 200		//Where do you want it to initially start
sStartx = 200		//Where do you want it to initially start
clipSpeed = 20		//Number of pixels for each step in the animation.

/******************************************************************************
Making the clipobject part
******************************************************************************/	
function makeObj(obj, nest, x, y){
	nest = (!nest) ? "":'document.'+nest+'.';										
   	this.css = bw.dom? document.getElementById(obj).style:bw.ie4?document.all[obj].style:bw.ns4?eval(nest+"document.layers." +obj):0;		
	this.evnt = bw.dom? document.getElementById(obj):bw.ie4?document.all[obj]:bw.ns4?eval(nest+"document.layers." +obj):0;													
	this.clip = b_clip;
	this.clipIt = b_clipIt;
	this.clipTo = b_clipTo;
	this.obj = obj + "Object";
	eval(this.obj + "=this");
	return this;
}

// A unit of measure that will be added when setting the position or size of a layer.
var px = bw.ns4||window.opera?"":"px";

//clip part
function b_clipTo(t,r,b,l){
	if (bw.ns4){
		this.css.clip.top=t;this.css.clip.right=r;this.css.clip.bottom=b;this.css.clip.left=l;
	}
	else {
		this.css.clip="rect("+t+"px "+r+"px "+b+"px "+l+"px)";
	}
}
function b_clipIt(tstop,rstop,bstop,lstop,step,fn){
	if (!fn) fn = null
	var clipval = new Array()
	if (bw.dom || bw.ie4) {
		clipval = this.css.clip
		clipval = clipval.slice(5,clipval.length-1);
		clipval = clipval.split(' ')
		for (var i=0; i<4; i++) clipval[i] = parseInt(clipval[i])
	}
	else {
		clipval[0] = this.css.clip.top
	    clipval[1] = this.css.clip.right
	    clipval[2] = this.css.clip.bottom
	    clipval[3] = this.css.clip.left
	}
	totantstep = Math.max(Math.max(Math.abs((tstop-clipval[0])/step),Math.abs((rstop-clipval[1])/step)),
		Math.max(Math.abs((bstop-clipval[2])/step),Math.abs((lstop-clipval[3])/step)))
	if (!this.clipactive)
		this.clip(clipval[0],clipval[1],clipval[2],clipval[3],(tstop-clipval[0])/totantstep,
			(rstop-clipval[1])/totantstep,(bstop-clipval[2])/totantstep,
				(lstop-clipval[3])/totantstep,totantstep,0, fn)
}
function b_clip(tcurr,rcurr,bcurr,lcurr,tperstep,rperstep,bperstep,lperstep,totantstep,antstep, fn){
	tcurr=tcurr+tperstep; rcurr=rcurr+rperstep
	bcurr=bcurr+bperstep; lcurr=lcurr+lperstep
	this.clipTo(tcurr,rcurr,bcurr,lcurr)
	if(antstep<totantstep){
		this.clipactive=true
		antstep++
		setTimeout(this.obj+".clip("+tcurr+","+rcurr+","+bcurr+","+lcurr+","+tperstep+","
			+rperstep+","+bperstep+","+lperstep+","+totantstep+","+antstep+",'"+fn+"')", 40)	
	}else{
		this.clipactive = false
		eval(fn)
	}
}
/******************************************************************************
Initiating the page and the clip objects.
******************************************************************************/	
function spotInit(){
	pageWidth = (bw.ns4 || bw.ns6)?innerWidth:document.body.clientWidth;
	pageHeight = (bw.ns4 || bw.ns6)?innerHeight:document.body.clientHeight;
	oExCont = new makeObj('divExCont')
	if (bw.dom || bw.ie4){
		oExCont.css.width = pageWidth+px
		oExCont.css.height = pageHeight+px
	}
	oCircle = new makeObj('divCircle','divExCont')
	oExCont.clipTo(sStarty,sStartx+sCircleWidth,sStarty+sCircleHeight,sStartx)
	oCircle.css.left = sStartx+px
	oCircle.css.top = sStarty+px
	oCircle.css.visibility = "visible"
	if (bw.ns4)document.captureEvents(Event.MOUSEMOVE)
	document.onmousemove = moveCircle;
}
function moveCircle(e){
	x = (bw.ns4 || bw.ns6)?e.pageX:event.x
	y = (bw.ns4 || bw.ns6)?e.pageY:event.y
	oExCont.clipTo(y-sCircleHeight/2, x+sCircleWidth/2, y+sCircleHeight/2, x-sCircleWidth/2)
	oCircle.css.left = x - sCircleWidth/2 + px
	oCircle.css.top = y - sCircleHeight/2 + px
}
//This is being called when someone clicks the circle.
function showCont(){
	document.onmousemove = null
	oCircle.css.visibility = "hidden"
	oCircle.css.left = 0+px
	oCircle.css.top = 0+px
	oExCont.clipIt(-clipSpeed, pageWidth+clipSpeed, pageHeight+clipSpeed, -clipSpeed, clipSpeed, 'oExCont.css.overflow="auto"')
}

if (bw.bw) onload = spotInit
</script>

将下面的代码复制到<body> 内

在此例中所用的图片