/* built with Studio Sketchpad: 
 *   https://sketchpad.cc
 * 
 * observe the evolution of this sketch: 
 *   https://accdf12.sketchpad.cc/sp/pad/view/ro.4oBGZSlEWp1/rev.2
 * 
 * authors: 
 *   Dansun Hwang
 *   Michael Kontopoulos

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




void setup(){
  size(640,480);
  smooth();
  rectMode(CENTER);
  strokeWeight(5);
}
void draw(){
  background(150);
  
  transformLines(mouseX);
  transformRect(mouseX);
}


float angle=0, scaler=0;

void transformRect(float input){
   float targetAngle = map(input, 0,width, 0, TWO_PI);
   float targetScaler = map(input, 0,width, 1, 2.5);
   
   angle += (targetAngle - angle) * 0.085;
   scaler+= (targetScaler - scaler) * 0.075;
   
   pushMatrix();
   translate(width/2, height/2);
   scale(scaler);
   rotate(angle);
   rect(0,0, 100, 50);
   popMatrix();
}

void transformLines(float input){
    float inc = map(input, 0,width, 5, 50);
    inc = constrain(inc, 5, 50);
    for(int i=height/2; i>=0; i-=inc){
       line(0, i, width, i); 
    }
    for(int i=height/2; i<=height; i+=inc){
       line(0, i, width, i); 
    }
  
}