/* built with Studio Sketchpad: 
 *   https://sketchpad.cc
 * 
 * observe the evolution of this sketch: 
 *   https://studio.sketchpad.cc/sp/pad/view/ro.K73ugYihsiw/rev.496
 * 
 * authors: 
 *   Matt Perkins

 * license (unless otherwise specified): 
 *   creative commons attribution-share alike 3.0 license.
 *   https://creativecommons.org/licenses/by-sa/3.0/ 
 */ 



// Pressing Control-R will render this sketch.

int i = 0; 
int imax = 2500;
PVector lasties;

void setup() {  // this is run once.   

    lasties = new PVector(0,0);    
    // set the background color
    background(255);
    
    // canvas size (Variable aren't evaluated. Integers only, please.)
    size(300, 300); 
      
    // smooth edges
    smooth();
    
    // limit the number of frames per second
    frameRate(30);
    
    // set the width of the line. 
    strokeWeight(1);
    
    imax = (height+50)/.2;
    
} 

void draw() {  // this is run repeatedly.  

    // set the color
    stroke(0, random(i%255), random(i%255), 5);
    
    translate(width/2,height/2);
    
    //set up some "parametric equations"
    int leftx = (i * .1) * cos(((5*i)/imax  ) * TWO_PI);
    int lefty = (i * .1) * sin(((5*i)/imax  ) * TWO_PI);    
    int rightx = (i * .15) * cos(((5*i)/imax  ) * TWO_PI);
    int righty = (i * .15) * sin(((5*i)/imax  ) * TWO_PI);
    
    for(j=0;j<64;j++)
    {
        int newX = random(leftx,rightx);
        int newY = random(lefty,righty);
    
        // draw the line
        line(lasties.x, lasties.y, newX, newY);
    
        lasties.x = newX;
        lasties.y = newY;
    }
    
    // move over a pixel
    if (i < imax) {
        i++;
    } else {
        i = 0; 
    }
}