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w-curves.html
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w-curves.html
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<html>
<head><title>W-Curves</title></head>
<script type="text/javascript">
function Ctxt(canvas, x, y, unit) {
this.x = x;
this.y = y;
this.c = canvas;
this.c.moveTo(x, y);
this.u = unit;
this.lineUp = function() {
this.y = this.y - this.u;
this.draw();
}
this.lineRight = function() {
this.x = this.x + this.u;
this.draw();
}
this.lineDown = function() {
this.y = this.y + this.u;
this.draw();
}
this.lineLeft = function() {
this.x = this.x - this.u;
this.draw();
}
this.draw = function() {
this.c.lineTo(this.x, this.y);
this.c.stroke();
}
}
function W1(ctxt, i) {
if (i == 0)
return;
ctxt.lineDown();
ctxt.lineRight();
}
function W2(ctxt, i) {
if (i == 0)
return;
ctxt.lineRight();
ctxt.lineUp();
}
function W3(ctxt, i) {
if (i == 0)
return;
ctxt.lineLeft();
ctxt.lineDown();
}
function W4(ctxt, i) {
if (i == 0)
return;
ctxt.lineUp();
ctxt.lineLeft();
}
function A(ctxt, i) {
if (i == 0)
return;
A(ctxt, i - 1);
W1(ctxt, i - 1);
B(ctxt, i - 1);
ctxt.lineRight();
D(ctxt, i - 1);
W2(ctxt, i - 1);
A(ctxt, i - 1);
}
function B(ctxt, i) {
if (i == 0)
return;
B(ctxt, i - 1);
W3(ctxt, i - 1);
C(ctxt, i - 1);
ctxt.lineDown();
A(ctxt, i - 1);
W1(ctxt, i - 1);
B(ctxt, i - 1);
}
function C(ctxt, i) {
if (i == 0)
return;
C(ctxt, i - 1);
W4(ctxt, i - 1);
D(ctxt, i - 1);
ctxt.lineLeft();
B(ctxt, i - 1);
W3(ctxt, i - 1);
C(ctxt, i - 1);
}
function D(ctxt, i) {
if (i == 0)
return;
D(ctxt, i - 1);
W2(ctxt, i - 1);
A(ctxt, i - 1);
ctxt.lineUp();
C(ctxt, i - 1);
W4(ctxt, i - 1);
D(ctxt, i - 1);
}
function draw() {
var e = document.getElementById("S");
var c = e.getContext("2d");
c.strokeStyle = "darkGrey";
c.strokeRect(0, 0, e.width, e.height);
c.strokeStyle = "black";
var p = 2;
for (var i = 1; i < 6; ++i) {
var u = e.height / (2 * p);
var x = e.width / p - (i * u) / p;
var y = e.height / (2 * p) - (i * u) / p;
c.beginPath();
var ctxt = new Ctxt(c, x, y, u);
A(ctxt, i);
ctxt.lineDown(); ctxt.lineRight();
B(ctxt, i);
ctxt.lineLeft(); ctxt.lineDown();
C(ctxt, i);
ctxt.lineUp(); ctxt.lineLeft();
D(ctxt, i);
ctxt.lineRight(); ctxt.lineUp();
c.closePath();
u = u / 2;
p = 2 * p;
}
}
</script>
<body onload="draw()">
<canvas id="S" width="1024" height="1024"></canvas>
</body>
</html>