smartdown/docs/lib/gallery/Tree.md

A library for translating, rendering and interacting with Smartdown documents. Smartdown is an extension of Markdown that provides richer media support and reactive programming capability.

## P5JS Tree


```p5js/playable
var theta1;
var theta2;

// Each branch now receives
// its length as an argument.
function branch(len, thick) {
//function branch(len) {
  if (thick > 1){
    p5.strokeWeight(thick);
  }
  else{
    p5.strokeWeight(1);
  }
  p5.line(0, 0, 0, -len);
  p5.translate(0, -len);

  // Each branch’s length
  // shrinks by two-thirds.
  len *= 0.66;
  thick -= 1;

  if (len > 2) {
    p5.push();
    p5.rotate(theta1);
    // Subsequent calls to branch()
    // include the length argument.
    branch(len,thick);
    //branch(len);
    p5.pop();

    p5.push();
    p5.rotate(-theta2);
    branch(len,thick);
    //branch(len);
    p5.pop();
  }
  else{
    var c = p5.color(0, 255, 0);
    p5.fill(c);
    p5.ellipse(0,0,3,7);
  }
}

p5.windowResized = function() {
  p5.resizeCanvas(p5.windowWidth - 70, 500);
};

p5.setup = function() {
  p5.createCanvas(100, 100);
  p5.windowResized();
};

p5.draw = function () {
  p5.background(255);

  theta1 = p5.map(p5.mouseX,0,p5.width,0,p5.PI/2);
  theta2 = p5.map(p5.mouseY,0,p5.height,0,p5.PI/2);

  // The first branch starts at the
  // bottom of the window.
  p5.translate(p5.width/2, p5.height);
  p5.stroke(0);
  branch(160,6);
  //branch(160);
};
```


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