/* built with Studio Sketchpad: 
 *   https://sketchpad.cc
 * 
 * observe the evolution of this sketch: 
 *   https://studio.sketchpad.cc/sp/pad/view/ro.IuD7$D8aC7U/rev.1207
 * 
 * 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 width2 = 0;
int height2 = 0;
int skew = 0;
int LINES = 1;

void setup() {  // this is run once.   
    
    // set the background color
    background(255);
    
    // canvas size (Variable aren't evaluated. Integers only, please.)
    size(800, 300); 
      
    // smooth edges
    smooth();
    
    // limit the number of frames per second
    frameRate(30);
    
    width2 = width/2;
    height2 = height/2;    
    
    background(0, 0, 0, 255);
    
    // set the width of the line. 
    strokeWeight(1);

} 

void draw() {  // this is run repeatedly.  
  
    // draw the line
    for(int j=0; j<(LINES+skew); j++) {
        strokeWeight(1);
        stroke(255, j, j, 16);
        int x = (width2 + 128)  * cos((j/(LINES+skew)) * TWO_PI) + width2;
        int y = (height2 + 128) * sin((j/(LINES+skew)) * TWO_PI) + height2;
        line(width2,height2,x,y); 
    }
           
    // move over a pixel
    if (i < LINES) {
        i++;        
    } else {
        i = 0; 
    }
    skew = (skew + 1) % 360;
}