/* built with Studio Sketchpad: 
 *   https://sketchpad.cc
 * 
 * observe the evolution of this sketch: 
 *   https://studio.sketchpad.cc/sp/pad/view/ro.KUXOwsTpvSo/rev.907
 * 
 * authors: 
 *   Sina Seifee

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



void setup() { 
    size(400, 500);
    background(255);
    stroke(0, 0, 0, 55);
    strokeWeight(1);
    initX=width/2;
    initY=height/2;
    smooth();
    //frameRate(60);
}  

int initX, initY;
float xoff = 0.0;

void draw(){
    if (random(1000)>999){
        background(255);
    }
    int res=100;
    int circle=360;
    float x, y, addX, addY;
    float a = 0.0;
    initX=width/2;
    initY=height/2;
    if (random(2)>0) {
        int mX=mouseX + (noise(xoff)-0.5)*mouseX - initX;
        int mY=mouseY + (noise(xoff+1.1)-0.5)*mouseY - initY;
    } else {
        int mX=mouseX-initX;
        int mY=mouseY-initY;
    }
    xoff+=0.01;
    int radX=mX/res/0.35;
    int radY=mY/res/0.35;
    float inc = TWO_PI/(res*2);
    for(int i=0; i<res; i+=180/circle) {
        x=(initX+sin(a+radX)*radX);
        y=(initY+cos(a+radY)*radY);
        addX=mX/res;
        addY=mY/res;
        line(initX, initY, x+addX, y+addY);

        a += inc;
        initX=x+addX;
        initY=y+addY;
    }
}