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View Full Version : Help with class assignment



toddk6444
01-25-2007, 08:45 PM
Hello
We have the assignment of taking this code and making some modifications to it. I don't know nearly as much as the rest of the class does about scripting so I was wondering if anyone had any suggestions of what I can do and how to go about doing it that would be great!

The script basically just makes some heart graphics float around the screen
Heres the script:

<SCRIPT LANGUAGE="JavaScript1.2">

var no = 12; // number of hearts
var speed = 10; // smaller number moves the hearts faster
var heart = "http://javascript.internet.com/img/heart/heart.gif";
var flag;

var dx, xp, yp; // coordinate and position variables
var am, stx, sty; // amplitude and step variables
var i, doc_width = 800, doc_height = 600;

dx = new Array();
xp = new Array();
yp = new Array();
amx = new Array();
amy = new Array();
stx = new Array();
sty = new Array();
flag = new Array();
for (i = 0; i < no; ++ i) {
dx[i] = 0; // set coordinate variables
xp[i] = Math.random()*(doc_width-30)+10; // set position variables
yp[i] = Math.random()*doc_height;
amy[i] = 12+ Math.random()*20; // set amplitude variables
amx[i] = 10+ Math.random()*40;
stx[i] = 0.02 + Math.random()/10; // set step variables
sty[i] = 0.7 + Math.random(); // set step variables
flag[i] = (Math.random()>0.5)?1:0;

document.write("<div id=\"dot"+ i +"\" style=\"POSITION: ");
document.write("absolute; Z-INDEX: "+ i +"; VISIBILITY: ");
document.write("visible; TOP: 15px; LEFT: 15px;\"><img src=\"");
document.write(heart+ "\" border=\"0\"></div>");
}

function snow() {
for (i = 0; i < no; ++ i) {
if (yp[i] > doc_height-50) {
xp[i] = 10+ Math.random()*(doc_width-amx[i]-30);
yp[i] = 0;
stx[i] = 0.02 + Math.random()/10;
sty[i] = 0.7 + Math.random();
flag[i]=(Math.random()<0.5)?1:0;
doc_width = document.body.clientWidth;
doc_height = document.body.clientHeight;
}

if (flag[i])
dx[i] += stx[i];
else
dx[i] -= stx[i];

if (Math.abs(dx[i]) > Math.PI) {
yp[i]+=Math.abs(amy[i]*dx[i]);
xp[i]+=amx[i]*dx[i];
dx[i]=0;
flag[i]=!flag[i];
}

document.getElementById(["dot"+i]).style.top = yp[i] + amy[i]*(Math.abs(Math.sin(dx[i])+dx[i]));
document.getElementById(["dot"+i]).style.left = xp[i] + amx[i]*dx[i];
}
setTimeout("snow()", speed);
}

snow();
// End -->
</script>

david_kw
01-26-2007, 01:25 AM
I have an idea! It only works in FF and Opera the moment and there are a few bugs to be sure and the coding might need some, shall we say, optimization. :) But I'll leave it as an exercise to fix those minor issues.

www.exfer.net/test/hearts.html

david_kw



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