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Лунин #10

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Лунин #10

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100 changes: 100 additions & 0 deletions lsystem.html
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Original file line number Diff line number Diff line change
@@ -0,0 +1,100 @@
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />

<script>
function run() {
var canvas = document.getElementById("canvas1");
var canvasHeight = parseInt(canvas.getAttribute("height"));
var canvasWidth = parseInt(canvas.getAttribute("width"));
var context = canvas.getContext('2d');
context.lineWidth = "1";
context.strokeStyle = "black";

var n = 3;
var q = 180 / 3;
var s = 2;
var point = { x: 250, y: 450, a: 0 };
var alg = LSystem("[F]+[F]+[F]+[F]+[F]+[F]", ["F F[+FF][-FF]FF[+F][-F]FF"], n);
Painter(point, s, q, alg, context);

n = 4;
q = 180 / 8;
s = 10;
point = { x: 700, y: 650, a: 250 };
alg = LSystem("F", ["F -F+F+[+F-F-]-[-F+F+F]"], n);
Painter(point, s, q,alg,context);

}
function LSystem(axiom, rules, n) {
var result = axiom;
for (var i = 0; i < n; i++) {
result = apply(result, rules);
}
return result;
}

function getFollower(sym, rules) {
for (var i = 0; i < rules.length; i++) {
var tmp = rules[i].charAt(0);
if (tmp == sym) {
var result = rules[i].substring(2, rules[i].length);
return result;
}
}
return sym;
}
function apply(string, rules) {
var result = "";
var n = string.length;
for (var i = 0; i < n; i++) {
var a = getFollower(string[i], rules);
result = result + a;
}
return result;
}
function Painter(paint, lenStep, angle, alg, context) {
var p = paint;
var s = lenStep;
var q = angle;
context.beginPath();
context.moveTo(p.x, p.y);
var stack = [];
for (var i = 0; i < alg.length; i++) {
switch (alg.charAt(i)) {
case 'F':
p.x -= s * Math.cos(-p.a * Math.PI / 180);
p.y -= s * Math.sin(-p.a * Math.PI / 180);
context.lineTo(p.x, p.y);
break;
case '+':
p.a -= q;
break;
case '-':
p.a += q;
break;
case '[':
stack.push({ x: p.x, y: p.y, a: p.a })
break;
case ']':
var tmp = stack.pop();
p.x = tmp.x;
p.y = tmp.y;
p.a = tmp.a;
context.moveTo(p.x, p.y);
break;
default:
break;
}
}
context.stroke();

}

</script>
<body onload="run()">
<canvas height='900' width='900' id='canvas1'></canvas>
</body>

</html>