107 lines
4.0 KiB
JavaScript
107 lines
4.0 KiB
JavaScript
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/******************************************
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* Snow Effect Script- By Altan d.o.o. (snow@altan.hr, http://www.altan.hr/snow/index.html)
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* Visit Dynamic Drive (http://www.dynamicdrive.com/) for full source code
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* Modified Dec 31st, 02' by DD. This notice must stay intact for use
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******************************************/
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//Configure below to change URL path to the snow image
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var snowsrc="images/snow.gif"
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// Configure below to change number of snow to render
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var no = 10;
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var ns4up = (document.layers) ? 1 : 0; // browser sniffer
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var ie4up = (document.all) ? 1 : 0;
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var ns6up = (document.getElementById&&!document.all) ? 1 : 0;
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var dx, xp, yp; // coordinate and position variables
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var am, stx, sty; // amplitude and step variables
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var i, doc_width = 800, doc_height = 600;
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if (ns4up||ns6up) {
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doc_width = self.innerWidth;
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doc_height = self.innerHeight;
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} else if (ie4up) {
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doc_width = document.body.clientWidth;
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doc_height = document.body.clientHeight;
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}
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dx = new Array();
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xp = new Array();
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yp = new Array();
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am = new Array();
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stx = new Array();
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sty = new Array();
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for (i = 0; i < no; ++ i) {
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dx[i] = 0; // set coordinate variables
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xp[i] = Math.random()*(doc_width-50); // set position variables
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yp[i] = Math.random()*doc_height;
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am[i] = Math.random()*20; // set amplitude variables
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stx[i] = 0.02 + Math.random()/10; // set step variables
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sty[i] = 0.7 + Math.random(); // set step variables
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if (ns4up) { // set layers
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if (i == 0) {
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document.write("<layer name=\"dot"+ i +"\" left=\"15\" top=\"15\" visibility=\"show\"><a href=\"http://dynamicdrive.com/\"><img src='"+snowsrc+"' border=\"0\"><\/a><\/layer>");
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} else {
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document.write("<layer name=\"dot"+ i +"\" left=\"15\" top=\"15\" visibility=\"show\"><img src='"+snowsrc+"' border=\"0\"><\/layer>");
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}
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} else if (ie4up||ns6up) {
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if (i == 0) {
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document.write("<div id=\"dot"+ i +"\" style=\"POSITION: absolute; Z-INDEX: "+ i +"; VISIBILITY: visible; TOP: 15px; LEFT: 15px;\"><a href=\"http://dynamicdrive.com\"><img src='"+snowsrc+"' border=\"0\"><\/a><\/div>");
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} else {
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document.write("<div id=\"dot"+ i +"\" style=\"POSITION: absolute; Z-INDEX: "+ i +"; VISIBILITY: visible; TOP: 15px; LEFT: 15px;\"><img src='"+snowsrc+"' border=\"0\"><\/div>");
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}
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}
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}
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function snowNS() { // Netscape main animation function
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for (i = 0; i < no; ++ i) { // iterate for every dot
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yp[i] += sty[i];
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if (yp[i] > doc_height-50) {
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xp[i] = Math.random()*(doc_width-am[i]-30);
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yp[i] = 0;
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stx[i] = 0.02 + Math.random()/10;
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sty[i] = 0.7 + Math.random();
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doc_width = self.innerWidth;
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doc_height = self.innerHeight;
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}
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dx[i] += stx[i];
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document.layers["dot"+i].top = yp[i];
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document.layers["dot"+i].left = xp[i] + am[i]*Math.sin(dx[i]);
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}
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setTimeout("snowNS()", 10);
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}
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function snowIE_NS6() { // IE and NS6 main animation function
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for (i = 0; i < no; ++ i) { // iterate for every dot
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yp[i] += sty[i];
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if (yp[i] > doc_height-50) {
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xp[i] = Math.random()*(doc_width-am[i]-30);
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yp[i] = 0;
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stx[i] = 0.02 + Math.random()/10;
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sty[i] = 0.7 + Math.random();
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doc_width = ns6up?window.innerWidth : document.body.clientWidth;
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doc_height = ns6up?window.innerHeight : document.body.clientHeight;
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}
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dx[i] += stx[i];
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if (ie4up){
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document.all["dot"+i].style.pixelTop = yp[i];
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document.all["dot"+i].style.pixelLeft = xp[i] + am[i]*Math.sin(dx[i]);
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}
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else if (ns6up){
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document.getElementById("dot"+i).style.top=yp[i];
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document.getElementById("dot"+i).style.left=xp[i] + am[i]*Math.sin(dx[i]);
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}
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}
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setTimeout("snowIE_NS6()", 10);
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}
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if (ns4up) {
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snowNS();
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} else if (ie4up||ns6up) {
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snowIE_NS6();
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}
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