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跟随鼠标很逼真的弹性小球

发布时间：2023-12-28 编辑：jiaochengji.com

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<html> <head> <title>跟随鼠标很逼真的弹性小球</title> </head><body>   <div id=dot0  style="HEIGHT: 16; POSITION: absolute; VISIBILITY: hidden; WIDTH: 11; left:10; top:15"><img height=11 src="" width=11> </div> <div id=dot1 style="HEIGHT: 11px; POSITION: absolute; WIDTH: 11px"><img height=11 src="" width=11> </div> <div id=dot2 style="HEIGHT: 11px; POSITION: absolute; WIDTH: 11px"><img height=11 src="" width=11> </div> <div id=dot3 style="HEIGHT: 11px; POSITION: absolute; WIDTH: 11px"><img height=11 src="" width=11> </div> <div id=dot4 style="HEIGHT: 11px; POSITION: absolute; WIDTH: 11px"><img height=11 src="" width=11> </div> <div id=dot5 style="HEIGHT: 11px; POSITION: absolute; WIDTH: 11px"><img height=11 src="" width=11> </div> <div id=dot6 style="HEIGHT: 16; POSITION: absolute; WIDTH: 11; left:10; top:15"><img height=11 src="" width=11> </div> <script language=JavaScript> var nDots = 7; var Xpos = 0; var Ypos = 0; var DELTAT = .01; var SEGLEN = 10; var SPRINGK = 10; var MASS = 1; var XGRAVITY = 0; var YGRAVITY = 50; var RESISTANCE = 10; 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(); init(); function init() {     var i = 0;     for (i = 0; i < nDots; i  ) {         dots[i] = new dot(i);     }      if (!isNetscape) {     }     for (i = 0; i < nDots; i  ) {         dots[i].obj.left = dots[i].X;         dots[i].obj.top = dots[i].Y;     }     if (isNetscape) {         startanimate();     } else {         setTimeout("startanimate()", 1000);     } } function dot(i) {     this.X = Xpos;     this.Y = Ypos;     this.dx = 0;     this.dy = 0;     if (isNetscape) {         this.obj = eval("document.dot"   i);     } else {         this.obj = eval("dot"   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 < (nDots - 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 MoveHandler(e) {     Xpos = e.pageX;     Ypos = e.pageY;     return true; } function MoveHandlerIE() {     Xpos = window.event.x   document.body.scrollLeft;     Ypos = window.event.y   document.body.scrollTop; }  if (isNetscape) {     document.captureEvents(Event.MOUSEMOVE);     document.onMouseMove = MoveHandler; } else {     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 = 1;     }     for (i = start ; i < nDots; i   ) {          var spring = new vec(0, 0);         if (i > 0) {             springForce(i-1, i, spring);         }         if (i < (nDots - 1)) {             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   XGRAVITY,             (spring.Y   resist.Y)/ MASS   YGRAVITY);         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;         if (isNetscape) {             height = window.innerHeight   window.pageYOffset;             width = window.innerWidth   window.pageXOffset;         } else {             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;     } } </script> </body></html>

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