recursive tree showing the use of objects

Author: m9dfukc

day_05/beginner/sketch_02_recursive_objects_tree/sketch_02_recursive_objects_tree.pde

@@ -0,0 +1,70 @@
+ArrayList<Branch> tree = new ArrayList<Branch>();
+float angle;
+
+void setup() {
+  size(700, 700);
+
+  PVector begin = new PVector(0, 0);
+  PVector end = new PVector(0, -190);
+  Branch root = new Branch(begin, end);
+  tree.add(root);
+
+  angle = PI / 4.0;
+}
+
+void mousePressed() {
+  for (int i = tree.size()-1; i >= 0; i = i - 1) {
+    Branch currentBranch = tree.get(i);
+    if (!currentBranch.finished) {
+      Branch rightBranch = currentBranch.branch(angle);
+      Branch leftBranch = currentBranch.branch(-angle);
+      tree.add(rightBranch);
+      tree.add(leftBranch);
+      currentBranch.finished = true;
+    }
+  }
+}
+
+void draw() {
+  background(230);
+
+  pushMatrix();
+  translate(width/2, height);
+  for (Branch branch : tree) {
+    branch.show();
+    branch.swing(millis() / 100.0);
+  }
+  popMatrix();
+}
+
+class Branch {
+  PVector begin;
+  PVector end;
+  boolean finished;
+
+  Branch(PVector begin, PVector end) {
+    this.begin = begin;
+    this.end = end;
+  }
+
+  Branch branch(float angle) {
+    PVector dir = PVector.sub(this.end, this.begin);
+    dir.rotate(angle);
+    dir.mult(0.67);
+    PVector newEnd = PVector.add(end, dir);
+    Branch newBranch = new Branch(end, newEnd);
+    return newBranch;
+  }
+
+  void swing(float time) {
+    float dist = map(PVector.dist(begin, end), 0, 190, 1, 0);
+    end.x += (noise(end.x, time) - 0.5) * dist * 3;
+    end.y += (noise(end.y, time) - 0.5) * dist * 3;
+  }
+
+  void show() {
+    stroke(0);
+    line(begin.x, begin.y, end.x, end.y);
+  }
+
+}