Koch curve: Difference between revisions
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<html> | <html> | ||
<form><textarea id="inputtext" rows=10 cols=35 wrap="off" style="width:600px;"> | <form><textarea id="inputtext" rows=10 cols=35 wrap="off" style="width:600px;"> | ||
function koch(x,level) { | function koch(x,level) { | ||
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<input type="button" value="clear" onClick="clearturtle()"> | <input type="button" value="clear" onClick="clearturtle()"> | ||
</form> | </form> | ||
< | </html> | ||
<jsxgraph width="600" height="400" box="box"> | |||
var brd = JXG.JSXGraph.initBoard('box', { | var brd = JXG.JSXGraph.initBoard('box', {boundingbox: [-300, 300, 300, -100]}); | ||
var t = brd. | 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 43: | Line 40: | ||
} | } | ||
run(); | run(); | ||
</ | </jsxgraph> | ||
===References=== | ===References=== | ||
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===Source code=== | ===Source code=== | ||
<source lang="javascript"> | <source lang="javascript"> | ||
var brd = JXG.JSXGraph.initBoard('box', {boundingbox: [-300, 300, 300, -100]}); | |||
var t = brd.create('turtle'); | |||
function run() { | |||
brd.suspendUpdate(); | |||
var code = document.getElementById('inputtext').value; | |||
if (code=='') { return; } | |||
eval(code); | |||
brd.unsuspendUpdate(); | |||
} | |||
function clearturtle() { | |||
t.cs(); | |||
} | |||
run(); | |||
function koch(x,level) { | function koch(x,level) { | ||
if (level<1) { | if (level<1) { | ||
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} else { | } else { | ||
koch(x/3,level-1); | koch(x/3,level-1); | ||
t.lt(60); | t.lt(60); | ||
koch(x/3,level-1); | koch(x/3,level-1); | ||
| Line 73: | Line 84: | ||
[[Category:Examples]] | [[Category:Examples]] | ||
[[Category:Turtle Graphics]] | [[Category:Turtle Graphics]] | ||
[[Category:Fractals]] | [[Category:Fractals]] | ||
[[Category:Curves]] | [[Category:Curves]] | ||
Latest revision as of 07:58, 8 June 2011
References
Source code
var brd = JXG.JSXGraph.initBoard('box', {boundingbox: [-300, 300, 300, -100]});
var t = brd.create('turtle');
function run() {
brd.suspendUpdate();
var code = document.getElementById('inputtext').value;
if (code=='') { return; }
eval(code);
brd.unsuspendUpdate();
}
function clearturtle() {
t.cs();
}
run();
function koch(x,level) {
if (level<1) {
t.fd(x);
} else {
koch(x/3,level-1);
t.lt(60);
koch(x/3,level-1);
t.rt(120);
koch(x/3,level-1);
t.lt(60);
koch(x/3,level-1);
}
}
t.cs();
t.hideTurtle();
t.setPos(-250,0);
t.rt(90);
koch(400,7);
