Turtle snow fall: Difference between revisions
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<html> | <html> | ||
<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 20: | Line 16: | ||
function snowflake(size, level) { | function snowflake(size, level) { | ||
(3 | for (var i=0; i<3; i++) { | ||
side(size, level); | side(size, level); | ||
t.rt(120); | t.rt(120); | ||
} | } | ||
} | } | ||
function snow() { | function snow() { | ||
| Line 45: | Line 41: | ||
<input type="button" value="clear" onClick="clearturtle()"> | <input type="button" value="clear" onClick="clearturtle()"> | ||
</form> | </form> | ||
< | </html> | ||
<jsxgraph width="600" height="600" box="box"> | |||
var brd = JXG.JSXGraph.initBoard('box', { | document.getElementById('box').style.backgroundColor = 'black'; | ||
var t = | var brd = JXG.JSXGraph.initBoard('box', {boundingbox: [-300, 300, 300, -300]}); | ||
var t = brd.create('turtle'); | |||
function run() { | function run() { | ||
brd.suspendUpdate(); | brd.suspendUpdate(); | ||
var code = | var code = document.getElementById('inputtext').value; | ||
if (code=='') { return; } | if (code=='') { return; } | ||
eval(code); | eval(code); | ||
| Line 61: | Line 58: | ||
} | } | ||
run(); | run(); | ||
</ | </jsxgraph> | ||
===References=== | ===References=== | ||
| Line 84: | Line 80: | ||
function snowflake(size, level) { | function snowflake(size, level) { | ||
(3 | for (var i=0; i<3; i++) { | ||
side(size, level); | side(size, level); | ||
t.rt(120); | t.rt(120); | ||
} | } | ||
} | } | ||
t.ht(); | t.ht(); | ||
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();
