/* built with Studio Sketchpad: 
 *   https://sketchpad.cc
 * 
 * observe the evolution of this sketch: 
 *   https://studio.sketchpad.cc/sp/pad/view/ro.hULq-k4vjn4/rev.614
 * 
 * authors: 
 *   Visa-Valtteri Pimiä

 * 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; 

void setup() {  // this is run once.   
    
    // set the background color
    background(255);
    
    // specify canvas size
    size(300, 300); 
      
    // smooth edges
    smooth();
    
    // limit the number of frames per second
    frameRate(30);
    
    // set the width of the line. 
    strokeWeight(1);
    noFill();
} 


void box(int x, int y, int sx, int sy, int v) {
    if (sx > 0 && sy > 0) {
        int midx = x+sx/2;
        int midy = y+sy/2
        translate(midx+cos(millis()*0.001+x*0.01)*20, midy+sin(millis()*0.001+y*0.01)*20);
        rotate((millis()*0.007+x*0.0001+y*0.0002)*y*0.0001-x*0.0001);
        translate(-midx, -midy);
        stroke(x*0.85);
        rect(x,y,sx,sy);
        box(x+v,y+v,sx-v,sy-v, v);
    }
}

void draw() {  // this is run repeatedly.  
    background(255);
    stroke(0);

    pushMatrix();
    translate(width/2,height/2);
    rotate(millis()*0.0006);
    translate(-width/2,-height/2);

    float bs = 180+sin(millis()*0.0001)*40;
    noFill();
    box(width/2-bs/2,height/2-bs/2,bs,bs, 2);
    
    popMatrix();


}