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paper.install(window);
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function gen_tree(pos) {
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var baum = new Branch();
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baum.length = (20 + Math.random() * 20);
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var shapernd = Math.random() * 3;
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if(shapernd < 1) {
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baum.crown = new KiteCrown(
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70 + Math.random() * 30,
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0.4 + Math.random() * 0.2,
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{bisect: 0.2 + Math.random() * 0.2},
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);
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} else if(shapernd < 2) {
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baum.crown = new TriangleCrown(
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70 + Math.random() * 30,
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0.4 + Math.random() * 0.2,
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);
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} else {
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baum.crown = new EllipseCrown(
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70 + Math.random() * 30,
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0.4 + Math.random() * 0.2,
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{bisect: 0.1 + Math.random() * 0.4},
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);
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}
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baum.angle = Math.PI / 2; // + Math.random() * 0.2 - 0.1;
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if((baum.crown.shape != "triangle") && (Math.random() < 0.5)) {
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var b = {
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length: baum.length * 0.4,
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angle: Math.PI / 2,
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crown: baum.crown.clone()
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};
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b.crown.length *= 0.4;
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baum.forks = [{
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pos: 0.2 + Math.random() * 0.4,
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branch: new Branch(b),
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}];
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baum.draw(pos);
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var step = (Math.random() < 0.5) ? -0.1 : 0.1;
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while(baum.collides_crown(baum.forks[0].branch)) {
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baum.forks[0].branch.angle += step;
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baum.draw(pos);
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}
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var range = 4*Math.PI/9 - Math.abs(Math.PI/2 - baum.forks[0].branch.angle);
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if(step > 0) {
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baum.forks[0].branch.angle += range * (0.1 + 0.9 * Math.random());
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} else {
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baum.forks[0].branch.angle -= range * (0.1 + 0.9 * Math.random());
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}
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baum.draw(pos);
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}
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baum.draw(pos);
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return baum;
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}
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class Crown {
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constructor(length, width, shape) {
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this.width = width;
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this.length = length;
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this.shape = shape;
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}
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undraw() {
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if(typeof this._path !== "undefined") {
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this._path.removeSegments();
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delete this._path;
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}
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}
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collides(other) {
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return this._path.intersects(other._path);
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}
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}
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class KiteCrown extends Crown {
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constructor(length, width, {bisect = 0.3}={}) {
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super(length, width, 'kite');
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this.bisect = bisect;
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}
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clone() {
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return new KiteCrown(this.length, this.width, {bisect: this.bisect});
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}
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draw(branch, bvec, cpos) {
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this.undraw();
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var cvec = bvec.multiply(1/bvec.length * this.length);
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var bswidth = this.length * this.width;
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var bsvec = new Point(Math.sin(branch.angle) * bswidth / 2,
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Math.cos(branch.angle) * bswidth / 2);
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this._path = new Path();
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this._path.strokeColor = 'black';
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this._path.fillColor = 'white';
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this._path.strokeWidth = 2;
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this._path.closed = true;
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this._path.add(cpos);
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this._path.add(cpos.add(cvec.multiply(this.bisect)).add(bsvec));
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this._path.add(cpos.add(cvec));
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this._path.add(cpos.add(cvec.multiply(this.bisect)).subtract(bsvec));
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}
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}
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class TriangleCrown extends Crown {
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constructor(length, width) {
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super(length, width, 'triangle');
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}
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clone() {
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return new TriangleCrown(this.length, this.width);
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}
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draw(branch, bvec, cpos) {
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this.undraw();
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var cvec = bvec.multiply(1/bvec.length * this.length);
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var bswidth = this.length * this.width;
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var bsvec = new Point(Math.sin(branch.angle) * bswidth / 2,
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Math.cos(branch.angle) * bswidth / 2);
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this._path = new Path();
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this._path.strokeColor = 'black';
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this._path.fillColor = 'white';
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this._path.strokeWidth = 2;
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this._path.closed = true;
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this._path.add(cpos.add(bsvec));
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this._path.add(cpos.add(cvec));
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this._path.add(cpos.subtract(bsvec));
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}
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}
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class EllipseCrown extends Crown {
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constructor(length, width, {bisect = 0.5}={}) {
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super(length, width, 'ellipse');
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this.bisect = bisect;
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}
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clone() {
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return new EllipseCrown(this.length, this.width, {bisect: this.bisect});
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}
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draw(branch, bvec, cpos) {
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this.undraw();
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var cvec = bvec.multiply(1/bvec.length * this.length);
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var bswidth = this.length * this.width;
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var bsvec = new Point(Math.sin(branch.angle) * bswidth / 2,
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Math.cos(branch.angle) * bswidth / 2);
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this._path = new Path();
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this._path.strokeColor = 'black';
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this._path.fillColor = 'white';
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this._path.strokeWidth = 2;
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this._path.closed = true;
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var cmid = cpos.add(cvec.multiply(this.bisect));
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this._path.add(new Segment(cpos,
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bsvec.multiply(0.5),
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bsvec.multiply(-0.5),
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));
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this._path.add(new Segment(cmid.subtract(bsvec),
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bvec.multiply(-0.5),
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bvec.multiply(0.5),
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));
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this._path.add(new Segment(cpos.add(cvec),
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bsvec.multiply(-0.5),
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bsvec.multiply(0.5),
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));
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this._path.add(new Segment(cmid.add(bsvec),
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bvec.multiply(0.5),
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bvec.multiply(-0.5),
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));
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}
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}
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class Branch {
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constructor(data, parentBranch=null) {
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//this.parentBranch = parentBranch;
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Object.assign(this, data);
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if(typeof this.forks !== "undefined") {
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for (let fork of this.forks) {
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fork.branch = new Branch(fork.branch, this);
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}
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}
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}
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draw(pos) {
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if(typeof this._branch !== "undefined") {
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this._branch.removeSegments();
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delete this._branch;
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}
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this._branch = new Path();
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var bvec = new Point(Math.cos(this.angle) * this.length,
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-1 * Math.sin(this.angle) * this.length);
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var end = pos.add(bvec);
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this._branch.strokeColor = 'black';
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this._branch.strokeWidth = 2;
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this._branch.add(pos);
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this._branch.add(end);
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if(typeof this.crown !== "undefined") {
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this.crown.draw(this, bvec, end);
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}
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if(typeof this.forks !== "undefined") {
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for (let fork of this.forks) {
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fork.branch.draw(pos.add(bvec.multiply(fork.pos)));
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}
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}
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}
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collides_crown(other) {
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return this.crown.collides(other.crown);
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}
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}
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window.onload = function() {
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var canvas = document.getElementById('canvas');
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paper.setup(canvas);
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//var br = new Branch(baum);
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for(var x=0; x<10; x++) {
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for(var y=0; y<5; y++) {
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var br = new Branch(gen_tree(new Point(50 + x*80, 150 + y*160)));
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}
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}
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}
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