Sketch of my generative art, "50 Lines"

50_lines.pde

float decel(float x) { // as an easing function
  return 1-(x-1)*(x-1);
}

void setup() {
  background(255);
  size(750,750,P2D);
  PImage img = loadImage("image.png");
  strokeWeight(2);
  noFill();
  for(float y=0.0;y<50;y++) {
    float l = 0;
    beginShape(LINES);
    for(float x=0;x<width*4;x++) {
      float xx=x/4.0;
      
      // using this version will generate a squished image due to using map(...) in line 26
      // color c = img.get(int(xx),int(y*height/50.0));
      color c = img.get(int(xx),int(map(y*height/50.0,0,height,50,height-50)));
      
      l += (255-red(c))/255/4.0; // period of the wave
      
      // 5*decel(m) sets the amplitude of the wave
      // map(...) sets the position of the wave
      float m = (255-red(c))/255.0; // separate it from an increasing variable (l)
      vertex(xx,map((y+0.5)*height/50.0,0,height,50,height-50)+sin(l*PI/2.0)*5*decel(m));
    }
    endShape();
  }
  saveFrame("image-edit.png");
}