コード
Tree tree;
float min_dist = 15;
float max_dist = 5;
void setup() {
size(960, 540);
colorMode(HSB, 360, 100, 100, 100);
tree = new Tree();
}
void draw() {
background(0, 0, 33);
tree.draw();
tree.grow();
}
class Tree {
ArrayList<Branch> branches = new ArrayList<Branch>();
ArrayList<Leaf> leaves = new ArrayList<Leaf>();
Tree() {
for (int i = 0; i < 1000; i++) {
leaves.add(new Leaf());
}
Branch root = new Branch(new PVector(width/2, height), new PVector(0, -1));
branches.add(root);
Branch current = new Branch(root);
while (!closeEnough(current)) {
Branch trunk = new Branch(current);
branches.add(trunk);
current = trunk;
}
}
boolean closeEnough(Branch b) {
for (Leaf l : leaves) {
float d = PVector.dist(b.pos, l.pos);
if (d < max_dist) {
return true;
}
}
return false;
}
void grow() {
for (Leaf l : leaves) {
Branch closest = null;
PVector closestDir = null;
float record = -1;
for (Branch b : branches) {
PVector dir = PVector.sub(l.pos, b.pos);
float d = dir.mag();
if (d < min_dist) {
l.reached();
closest = null;
break;
} else if (d > max_dist) {
} else if (closest == null || d < record) {
closest = b;
closestDir = dir;
record = d;
}
}
if (closest != null) {
closestDir.normalize();
closest.dir.add(closestDir);
closest.count++;
}
}
}
void draw() {
for (Leaf l : leaves) {
l.draw();
}
for (Branch b : branches) {
if (b.parent != null) {
stroke(0, 0, 100);
line(b.pos.x, b.pos.y, b.parent.pos.x, b.parent.pos.y);
}
}
}
}
class Branch {
Branch parent;
PVector pos;
PVector dir;
int count = 0;
PVector saveDir;
float len = 5;
Branch(PVector _pos, PVector _dir) {
parent = null;
pos = _pos.copy();
dir = _dir.copy();
saveDir = dir.copy();
}
Branch(Branch _parent) {
parent = _parent;
pos = parent.next();
dir = parent.dir.copy();
saveDir = dir.copy();
}
void reset() {
count = 0;
dir = saveDir.copy();
}
PVector next() {
PVector v = PVector.mult(dir, len);
PVector next = PVector.add(pos, v);
return next;
}
}
class Leaf {
PVector pos;
boolean reached = false;
float d = 4;
Leaf() {
pos = PVector.random2D();
pos.mult(random(width/2));
pos.x += width/2;
pos.y += height/2;
}
void reached() {
reached = true;
}
void draw() {
fill(0, 0, 100);
noStroke();
ellipse(pos.x, pos.y, d, d);
}
}
リファレンス
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