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/* LSystem */
function LSystem(axiom, ruleset) {
this.alphabet = ['F', '+', '-', '[', ']'];
this.axiom = axiom;
this.rule = ["", "+", "-", "[", "]"];
this.tree = "";
this.rule[0] = ruleset;
this.draw = function(x, y, zoom, angle, drawtype) {
a.fillStyle = "#000";
a.strokeStyle = "#000";
a.save();
a.translate(x, y);
var i;
for (i=0; i<this.tree.length; i++) {
switch (this.tree.charAt(i)) {
case 'F':
switch (drawtype) {
case 'line':
a.beginPath();
a.moveTo(0, 0);
a.lineTo(zoom, 0);
a.closePath();
a.stroke();
break;
case 'hollow_circle':
a.beginPath();
a.arc(0, 0, zoom / 10, 0, Math.PI*2, true);
a.closePath();
a.stroke();
break;
case 'filled_circle':
a.beginPath();
a.arc(0, 0, zoom / 10, 0, Math.PI*2, true);
a.closePath();
a.fill();
break;
case 'faint':
a.fillStyle = "rgba(0, 0, 0, " + (i / this.tree.length) + ")";
a.beginPath();
a.moveTo(Math.random() - .5, Math.random() - .5);
a.lineTo(Math.sin(zoom) + (zoom / 2), Math.random() - .5);
a.lineTo(zoom, 0);
a.closePath();
a.fill();
break;
case 'small_circles':
a.fillStyle = "rgba(0, 0, 0, " + (i / this.tree.length) + 0.2 + ")";
a.beginPath();
a.moveTo(Math.random() - .5, Math.random() - .5);
a.lineTo(Math.sin(zoom) + (zoom / 2), Math.random() - .5);
a.arc(Math.sin(zoom) + (zoom / 2), Math.random() - .5, zoom / 5, 0, Math.PI*2, true);
a.lineTo(zoom, 0);
a.closePath();
a.fill();
break;
case 'triangles':
a.fillStyle = "rgba(0, 0, 0, " + (i / this.tree.length) + ")";
a.beginPath();
var dist = zoom / 2;
var halfdist = dist / 2;
a.moveTo(0, dist);
a.lineTo(halfdist, halfdist);
a.lineTo(dist, 0);
a.lineTo(halfdist, -halfdist);
a.lineTo(0, -dist);
a.closePath();
a.fill();
break;
case 'more_circles':
a.fillStyle = "rgba(0, 0, 0, " + Math.random() + ")";
a.beginPath();
a.arc(Math.random() + .5, Math.random() - .5, (i / this.tree.length) * 5, 0, Math.PI*2, true);
a.closePath();
a.fill();
a.fillStyle = "rgba(0, 0, 0, " + Math.random() + ")";
a.beginPath();
a.arc(Math.random() - .5, Math.random() + .5, (i / this.tree.length) * 3, 0, Math.PI*2, true);
a.closePath();
a.fill();
break;
case 'hatch':
var red = Math.random() * 255;
var green = Math.random() * 255;
var blue = Math.random() * 255;
a.strokeStyle = "rgba(" + red + ", " + green + ", " + blue + ", " + (i / this.tree.length) + ")";
a.beginPath();
var dist = zoom / 2;
a.moveTo(-dist, -dist);
a.lineTo(dist, -dist);
a.moveTo(-dist, 0);
a.lineTo(dist, 0);
a.moveTo(-dist, dist);
a.lineTo(dist, dist);
a.closePath();
a.stroke();
break;
}
a.translate(zoom, 0);
break;
case '+':
a.rotate(angle);
break;
case '-':
a.rotate(-angle);
break;
case '[':
a.save();
break;
case ']':
a.restore();
break;
}
}
a.restore();
}
this.iterate = function(max_length) {
this.tree = this.axiom;
var rule_length = [];
var i;
for (i=0; i<this.alphabet.length; i++) {
rule_length[i] = this.rule[i].length;
}
for (i=0; i<max_length; i++) {
var new_length = 0;
var j;
for (j=0; j<this.tree.length; j++) {
var c = this.tree.charAt(j);
var k;
for (k=0; k<this.alphabet.length; k++) {
if (c == this.alphabet[k]) {
new_length += rule_length[k];
break;
}
}
}
var new_tree = [];
for (j=0; j<this.tree.length; j++) {
var c = this.tree.charAt(j);
var k;
for (k=0; k<this.alphabet.length; k++) {
if (c == this.alphabet[k]) {
new_tree.push(this.rule[k]);
break;
}
}
}
this.tree = new_tree.join("");
}
}
}
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