Tree
/**
* Recursive Tree
* by Daniel Shiffman.
*
* Renders a simple tree-like structure via recursion.
* The branching angle is calculated as a function of
* the horizontal mouse location. Move the mouse left
* and right to change the angle.
*/
float theta;
void setup() {
size(640, 360);
}
void draw() {
background(0);
frameRate(30);
stroke(255);
float a = (mouseX / (float)width) * 90;
theta = radians(a);
translate(width / 2, height);
line(0, 0, 0, -120);
translate(0, -120);
branch(120);
}
void branch(float h) {
h *= 0.66;
if (h > 2) {
pushMatrix();
rotate(theta);
line(0, 0, 0, -h);
translate(0, -h);
branch(h);
popMatrix();
pushMatrix();
rotate(-theta);
line(0, 0, 0, -h);
translate(0, -h);
branch(h);
popMatrix();
}
}