Evolution of Xanthorrhoea 001_4

processing code

// Author: Rupert Russell
// Title: xanthorrhoea 001.4
// Date: October 21, 2010

  
// global vairables
  float min_x1 = 0;
  float max_x2 = 0;
  float center_of_trunk;

void setup() {
  size(300, 300);
  smooth();
  noLoop(); 
}  // end of viod setup

void draw() {
  
  int trunk_width;
  int trunk_height;
  float lean;
  int start_x;
  int start_y;
  int colour;

  // draw first trunk

  trunk_width = 25;
  trunk_height = 150;
  lean = 0;
  start_x = width /4;
  start_y = height - 20;
  colour = 60;
  xanthorrhoea(trunk_width, trunk_height, lean, start_x, start_y, colour);    
  
  // draw second trunk
  trunk_width = 24;
  trunk_height = 170;
  lean = -0.1;
  start_x = width /2;
  start_y = height;
  colour = 110;
  xanthorrhoea(trunk_width, trunk_height, lean, start_x, start_y, colour);   
  
} // end void draw()
   

void xanthorrhoea(int trunk_width, int trunk_height, float lean, int start_x, int start_y, int colour){
   
  // draw trunk
  float step = 0.5;
  float x1;
  float y1;
  float x2;
  float y2;
  float y_stem;
  float x_stem;


  for (int counter = 0; counter < trunk_height; counter ++){
    
    // generate random values for trunk
    stroke(colour);
    strokeWeight(random(0.2, 2));
    float rand_y = random(0.2, 5);
    float rand_x = random(10);
    x1 = start_x + rand_x + (lean * counter);   // apply a lean to the trunk
    y1 = start_y - (step * counter) - rand_y;
    x2 = start_x + trunk_width + rand_x + (lean * counter);  // slightly random trunk width
    y2 = start_y - (step * counter) - rand_y * 2;
    line(x1, y1, x2, y2);
    center_of_trunk = (x2 - x1) / 2 + x1;  // center_of_trunk is a global variable used to position the flower stem
  } // end of for loop


  // draw flower stem
  y_stem = start_y - (step * trunk_height);

  
  // flower stem
  x_stem = center_of_trunk;
  for (int count = 0; count < 90; count ++) {
    x_stem = x_stem + random(-1, 1);
    if(count < 50 ){
      //draw stem
      strokeWeight(2);
    }
    else{
      //draw flower head
      strokeWeight(4);
    }
      point(x_stem, y_stem - count);
  }
  
  

} // end of viod xanthorrhoea