Difference between revisions of "Turtle snow fall"

From JSXGraph Wiki
Jump to: navigation, search
 
Line 44: Line 44:
 
<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', {originX: 300, originY: 300, unitX: 1, unitY: 1});
+
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 09:40, 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();