/* built with Studio Sketchpad: 
 *   https://sketchpad.cc
 * 
 * observe the evolution of this sketch: 
 *   https://studio.sketchpad.cc/sp/pad/view/ro.7vDDvvXp21d/rev.189
 * 
 * authors: 
 *   alexq
 *   (Unnamed author)

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



// This sketch builds on a prior work, "Untitled Sketch", created by alexq
// http://studio.sketchpad.cc/sp/pad/view/ro.9QMyHLDK-juIJ/rev.53
// Pressing Control-R will render this sketch.

int i = 0;
int j = 0;
int k = 0;

int cr, cg, cb, ca ;

int n1, n2 ;

int half_width = 0 ;

void setup() {  // this is run once.   
    
    // set the background color
    background(255);
    
    // canvas size (Integers only, please.)
    size(300, 300);
    half_width = width / 2 ;
      
    // smooth edges
    smooth();
    
    // limit the number of frames per second
    frameRate(120);
    
    // set the width of the line. 
    strokeWeight(5);
} 

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

    // set the color
    
    cr = sin ( k * 0.0021293 ) * 127 + 127 ;
    cg = sin ( k * 0.0038182 ) * 127 + 127 ;
    cb = sin ( k * 0.0022135 ) * 127 + 127 ;
    stroke( cr, cg, cb, 50);
    
    // draw the line
    
    n1 = ( sin ( k * 0.015433 ) * half_width + half_width ) ;
    n2 = ( sin ( k * 0.03178 ) * half_width + half_width ) ;
    line ( n2, 0, i, height ) ;
    
    k++ ;
    
    // move over a pixel
    if ( i < width ) {
        i++;
    } else {
        i = 0; 
    }
}