Turtle snow fall: Difference between revisions
From JSXGraph Wiki
A WASSERMANN (talk | contribs) No edit summary |
A WASSERMANN (talk | contribs) No edit summary |
||
| Line 3: | Line 3: | ||
<script type="text/javascript" src="http://jsxgraph.uni-bayreuth.de/distrib/prototype.js"></script> | <script type="text/javascript" src="http://jsxgraph.uni-bayreuth.de/distrib/prototype.js"></script> | ||
<script type="text/javascript" src="http://jsxgraph.uni-bayreuth.de/distrib/jsxgraphcore.js"></script> | <script type="text/javascript" src="http://jsxgraph.uni-bayreuth.de/distrib/jsxgraphcore.js"></script> | ||
<form><textarea id="inputtext" rows=3 cols=35 wrap="off" style="width:600px;"> | <form><textarea id="inputtext" rows=3 cols=35 wrap="off" style="width:600px;"> | ||
function side(size, level) { | function side(size, level) { | ||
| Line 48: | Line 47: | ||
<script language="JavaScript"> | <script language="JavaScript"> | ||
var brd = JXG.JSXGraph.initBoard('box', {originX: 300, originY: 300, unitX: 1, unitY: 1}); | var brd = JXG.JSXGraph.initBoard('box', {originX: 300, originY: 300, unitX: 1, unitY: 1}); | ||
var t = | var t = brd.createElement('turtle'); | ||
function run() { | function run() { | ||
brd.suspendUpdate(); | brd.suspendUpdate(); | ||
Revision as of 15:17, 21 January 2009
References
The source code
function side(size, level) {
if (level==0) {
t.fd(size);
} else {
side(size/3, level-1);
t.lt(60);
side(size/3, level-1);
t.rt(120);
side(size/3, level-1);
t.lt(60);
side(size/3, level-1);
}
}
function snowflake(size, level) {
(3).times(function() {
side(size, level);
t.rt(120);
});
}
t.ht();
function snow() {
counter++;
if (counter>500) {
counter = 0;
t.cs();
}
t.setPos(Math.random()*600-300,Math.random()*600-300);
snowflake(30*Math.random(),Math.floor(Math.random()*4));
active = setTimeout(snow,200);
}
t.setPenColor('#ffff00');
counter = 0;
snow();
