黃淑蘭雜記

滑鼠吊飾特效

這是一個特效，讓滑鼠下方有一種大圖帶小圖的吊飭效果。
建議用PhotoImpact畫一個較大的圖存成
aa.gif
然後再畫一個較小的圖案，存五次，分別存成：
a_1.gif
a_2.gif
a_3.gif
a_4.gif
a_5.gif

把它們都放在和要使用特效的htm檔的同一資料夾裡。（若懂路徑則不在此限。）

在htm檔裡的語法如下：

把以下框內的語法，按右鍵/複製，貼到 <body> 標簽下方。

<Script Language='JavaScript'>
//***************************
var kosu = 5;
var Xpos = 0;
var Ypos = 0;
var DELTAT = 0.009;
var SEGLEN = 10;
var SPRINGK = 8;
var MASS = 1;
var GRAVITY = 50;
var RESISTANCE = 12;
var STOPVEL = 0.1;
var STOPACC = 0.1;
var DOTSIZE = 11;
var BOUNCE = 0.75;
var isNetscape = navigator.appName=='Netscape';
var followmouse = true;
var dots = new Array();
function init() {
var i = 0;
for (i = 0; i < kosu+1; i++) {
dots[i] = new dot(i);
}
setTimeout('startanimate()', 3000);
document.body.scroll = 'yes' }
function dot(i) {
this.X = Xpos;
this.Y = Ypos;
this.dx = 0;
this.dy = 0;
this.obj = eval('img' + i + '.style');
}
 
function startanimate() {
setInterval('animate()', 20);
 }
 
function setInitPositions(dots) {
var startloc = document.all.tags('LI');
var i = 0;
for (i = 0; i < startloc.length && i < (kosu - 1); i++) {
dots[i+1].X = startloc[i].offsetLeft
startloc[i].offsetParent.offsetLeft - DOTSIZE;
dots[i+1].Y = startloc[i].offsetTop +
startloc[i].offsetParent.offsetTop + 2*DOTSIZE;
}
dots[0].X = dots[1].X;
dots[0].Y = dots[1].Y - SEGLEN;
}
function MoveHandlerIE() {
Xpos = window.event.x + document.body.scrollLeft;
Ypos = window.event.y + document.body.scrollTop;
}
document.onmousemove = MoveHandlerIE;
function vec(X, Y)
{
this.X = X;
this.Y = Y;
}
function springForce(i, j, spring)
{
var dx = (dots[i].X - dots[j].X);
var dy = (dots[i].Y - dots[j].Y);
var len = Math.sqrt(dx*dx + dy*dy);
if (len > SEGLEN) {
var springF = SPRINGK * (len - SEGLEN);
spring.X += (dx / len) * springF;
spring.Y += (dy / len) * springF;
   }
}
function animate() {
var start = 0;
if (followmouse) {
dots[0].X = Xpos;
dots[0].Y = Ypos;
start = 0;
}
for (i = start ; i < kosu+1; i++ ) {
var spring = new vec(0, 0);
if (i > 0) {
springForce(i-1, i, spring);
}
if (i < (kosu )) {
springForce(i+1, i, spring);
}
var resist = new vec(-dots[i].dx * RESISTANCE, -dots[i].dy * RESISTANCE);
var accel = new vec((spring.X + resist.X)/ MASS, (spring.Y + resist.Y)/ MASS + GRAVITY);
dots[i].dx += (DELTAT * accel.X);
dots[i].dy += (DELTAT * accel.Y);
if (Math.abs(dots[i].dx) < STOPVEL &&
Math.abs(dots[i].dy) < STOPVEL &&
Math.abs(accel.X) < STOPACC &&
Math.abs(accel.Y) < STOPACC) {
dots[i].dx = 0;
dots[i].dy = 0;
}
dots[i].X += dots[i].dx;
dots[i].Y += dots[i].dy;
var height, width;
height = document.body.clientHeight + document.body.scrollTop;
width = document.body.clientWidth + document.body.scrollLeft;
if (dots[i].Y >=  height - DOTSIZE - 1) {
if (dots[i].dy > 0) {
dots[i].dy = BOUNCE * -dots[i].dy;
}
dots[i].Y = height - DOTSIZE - 1;
}
if (dots[i].X >= width - DOTSIZE) {
if (dots[i].dx > 0) {
dots[i].dx = BOUNCE * -dots[i].dx;
}
dots[i].X = width - DOTSIZE - 1;
}
if (dots[i].X < 0) {
if (dots[i].dx < 0) {
dots[i].dx = BOUNCE * -dots[i].dx;
}
dots[i].X = 0;
}
dots[i].obj.left = dots[i].X;
dots[i].obj.top =  dots[i].Y;
   }
}
// End -->
</script>
<SPAN id='img0' style='position:absolute; left:-35px; top:-44px; z-index:1'><IMG SRC='../aa.gif' ></SPAN>
<SPAN id='img1' style='position:absolute; left:-26px; top:-26px; z-index:2'><IMG SRC='../a_1.gif' ></SPAN>
<SPAN id='img2' style='position:absolute; left:-26px; top:-26px; z-index:3'><IMG SRC='../a_2.gif' ></SPAN>
<SPAN id='img3' style='position:absolute; left:-26px; top:-26px; z-index:4'><IMG SRC='../a_3.gif' ></SPAN>
<SPAN id='img4' style='position:absolute; left:-26px; top:-26px; z-index:5'><IMG SRC='../a_4.gif' ></SPAN>
<SPAN id='img5' style='position:absolute; left:-35px; top:-44px; z-index:6'><IMG SRC='../a_5.gif' ></SPAN>
<Script Language='JavaScript'>

</Script>

>>>範例在此<<<

淑蘭雜記簿

滑鼠吊飾特效