prickly tree

float branchAngle;

​

void setup(){ 

  size(500,500, P3D); 

  branchAngle = 30;

} 

​

void draw(){ 

    translate(250,300); 

    rotateY(radians(map(mouseX, 0, width, 0, 360)));

    rotateX(radians(map(mouseY, 0, height, 0, 90)));

    drawTree(); 

    if (mousePressed) {

      branchAngle++;

    }

} 

​

void drawTree(){ 

  background(50); 

  int depth = 8; 

  strokeWeight(depth/2.0); 

  stroke(255); 

  line(0,100,0,0); 

  branch(depth); 

} 

​

​

void branch(int depth){ 

  pushMatrix();                    // store the old state 

  rotateX(radians(branchAngle));

  rotateZ(radians(branchAngle));

  subBranch(depth);                // and draw one branch 

  popMatrix();                     // go back to old state 

  rotateX(radians(-branchAngle));

  rotateZ(radians(-branchAngle));

  subBranch(depth);                // and draw another branch 

} 

void subBranch(int depth) { 

  scale(0.8); 

  int len = 50; 

  translate(0,-len); 

  strokeWeight(depth/2.0); 

  line(0,len,0,0); 

  fill(0); 

  if(depth == 0) {

    ellipse(0,0,70,80);

  } 

  if(depth > 0) branch(depth-1); 

} 

​

​

​