Contain Flying Planes Script to a certain area

[mtlhead]

1) Script Title:
Flying Planes Script

2) Script URL (on DD):
http://dynamicdrive.com/dynamicindex4/plane.htm

3) Describe problem:
I need help modifying this script so that the planes only fly within a certain area of my page. Depending on the users resolution this area can be in a different spot. Right now the area is simply a table cell but I can use <div>'s too.


I've tried changing some numbers but can't seem to narrow it down and am not confident it will work in other browsers/resolutions.

Thanks in advance

[thetestingsite]

Try these changes in the script (changes in red):

<script language="JavaScript1.2">

//Flying planes - by John Ely
//Modified from: Autumn leaves script- by Kurt Grigg (kurt.grigg@virgin.net)
//Modified by Dynamic Drive for NS6 functionality
//visit http://www.dynamicdrive.com for this script

//Pre-load your image below!
//CHANGE 5 to the number of images listed below
grphcs=new Array(5) 

//PRELOAD the involved images (extend or contract variables according to # of images used)
Image0=new Image();
Image0.src=grphcs[0]="plane0.gif"
Image1=new Image();
Image1.src=grphcs[1]="plane1.gif"
Image2=new Image();
Image2.src=grphcs[2]="plane2.gif"
Image3=new Image();
Image3.src=grphcs[3]="plane3.gif"
Image4=new Image();
Image4.src=grphcs[4]="plane4.gif"

//SPECIFY number of images to randomly display concurrently from list above. Less the more efficient
Amount=3; 
Ypos=new Array();
Xpos=new Array();
Speed=new Array();
Step=new Array();
Cstep=new Array();
ns=(document.layers)?1:0;
ns6=(document.getElementById&&!document.all)?1:0;
ie=document.all

if (ns){
for (i = 0; i < Amount; i++){
var P=Math.floor(Math.random()*grphcs.length);
rndPic=grphcs[P];
document.write("<LAYER NAME='sn"+i+"' LEFT=0 TOP=0 WIDTH=150><img src="+rndPic+"></LAYER>");
}
}
else{
document.write('<div style="position:absolute;top:0px;left:0px;width:150;"><div style="position:relative">');
for (i = 0; i < Amount; i++){
var P=Math.floor(Math.random()*grphcs.length);
rndPic=grphcs[P];
document.write('<img id="si'+i+'" src="'+rndPic+'" style="position:absolute;top:0px;left:0px">');
}
document.write('</div></div>');
}
WinHeight=(ns||ns6)?window.innerHeight-70:window.document.body.clientHeight;
WinWidth=(ns||ns6)?window.innerWidth:window.document.body.clientWidth;
for (i=0; i < Amount; i++){                                                                
 Ypos[i] = Math.round(Math.random()*WinHeight);
 Xpos[i] = Math.round(Math.random()*WinWidth);
 Speed[i]= Math.random()*5+1;
 Cstep[i]=0;
 Step[i]=Math.random()*0.1+0.05;
}
function fly(){
var WinHeight=(ns||ns6)?window.innerHeight:window.document.body.clientHeight;
var WinWidth=(ns||ns6)?window.innerWidth-70:window.document.body.clientWidth;
var hscrll=(ns||ns6)?window.pageYOffset:document.body.scrollTop;
var wscrll=(ns||ns6)?window.pageXOffset:document.body.scrollLeft;

for (i=0; i < Amount; i++){
sy = Speed[i]*Math.sin(Cstep[i]);
sx = Speed[i]*2;
Ypos[i]+=sy;
Xpos[i]+=sx; 
if (Xpos[i] > WinWidth){
Ypos[i]=Math.round(Math.random()*WinHeight);
Xpos[i]=-60;
Speed[i]=Math.random()*5+1;
}

if (ns){
document.layers['sn'+i].left=Xpos[i]+wscrll;
document.layers['sn'+i].top=Ypos[i];
}

else if (ns6){
document.getElementById("si"+i).style.left=Xpos[i]+wscrll;
document.getElementById("si"+i).style.top=Math.min(WinHeight,Ypos[i]);
}

else{
eval("document.all.si"+i).style.left=Xpos[i]+wscrll;
eval("document.all.si"+i).style.top=Ypos[i];
} 
Cstep[i]+=Step[i];
}
setTimeout('fly()',20);
}

if (ie||ns||ns6)
window.onload=fly
//-->
</script>

Hope this helps.

[mtlhead]

Thanks, that was what I started out with and ended up with several more changes. I made it good for one image only and set it so the image moves in a straight line (no sine wave). I still don't like how it just cuts off at the edges of my layer/div and want to implement a customizable delay before it flies over again and maybe put in a variable to set the number of flyovers there will be. The layer/div code was moved inside my table.

More work and little time. Being that this is just an enhancement I am moving on with the site and will come back to this later.

<script language="JavaScript1.2">
        //Flying planes - by John Ely
        //Modified from: Autumn leaves script- by Kurt Grigg (kurt.grigg@virgin.net)
        //Modified by Dynamic Drive for NS6 functionality
        //Modified by Jason Wagner for containment & quantity
        //visit http://www.dynamicdrive.com for this script

        ns=(document.layers)?1:0;
        ns6=(document.getElementById&&!document.all)?1:0;
        ie=document.all;
        delay = 3;    //delay between loops in seconds
        dismissafter=3;
        
        WinHeight=1;
        WinWidth=500;        
        
        Ypos = Math.round(Math.random()*WinHeight);
        Xpos = Math.round(Math.random()*WinWidth);
        Speed= Math.random()*2+1;    
        Step=Math.random()*0.1+0.05;

        function fly(){        
            sy = Speed*Math.sin(Step);
            sx = Speed*2;
            Ypos+=sy;
            Xpos+=sx;
            
            //wrap the animation back to the left side
            if (Xpos > WinWidth){
                //setTimeout('reset()',delay*1000);
                reset();
            } else {        
                //position the image element
                if (ns){
                    document.layers['sn'].left=Xpos;
                    document.layers['sn'].top=Ypos;
                } 
                else if (ns6) {
                    document.getElementById("si").style.left=Xpos;
                    document.getElementById("si").style.top=Math.min(WinHeight,Ypos);
                } 
                else {
                    eval("document.all.si").style.left=Xpos;
                    eval("document.all.si").style.top=Ypos;
                } 
                Step++;            
            }            
            
            //keep the animation going
            setTimeout('fly()',100); //execute the script after waiting 1/10 of a second
        }

        function reset(){
            Ypos=Math.round(Math.random()*WinHeight);        //reset the y-coordinate
            Xpos=-10;                                        //reset the x-coorinate, use - so it flys in
            Speed=Math.random()*5+1;                        //reset the speed            
        }
        
        //start the animation
        if (ie||ns||ns6)
            //window.onload=fly
    //-->
    </script>