Turtle snow fall: Difference between revisions
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<jsxgraph width="600" height="600" box="box"> | <jsxgraph width="600" height="600" box="box"> | ||
document.getElementById('box').style.backgroundColor = 'black'; | document.getElementById('box').style.backgroundColor = 'black'; | ||
var brd = JXG.JSXGraph.initBoard('box', { | var brd = JXG.JSXGraph.initBoard('box', {boundingbox: [-300, 300, 300, -300]}); | ||
var t = brd.create('turtle'); | var t = brd.create('turtle'); | ||
function run() { | function run() { | ||
Latest revision as of 07:40, 9 June 2011
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) {
for (var i=0; i<3; i++) {
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();
