// Zoom 
// by REAS <http://reas.com> 

PImage a; 
boolean onetime = true; 
int[][] aPixels; 
float sval = 1.0; 
float nmx, nmy; 
int res = 5; 
 
void setup() 
{ 
  size(200, 200, P3D); 
  noFill(); 
  stroke(255); 
  aPixels = new int[width][height]; 
  a = loadImage("ystone08.jpg"); 
  for(int i=0; i<height; i++) { 
    for(int j=0; j<width; j++) { 
      aPixels[j][i] = a.pixels[i*width+j]; 
    } 
  } 
} 
 
void draw() 
{ 
  background(51); 
  
  if (abs(mouseX - nmx) > 1.0) { 
    nmx = nmx + (mouseX-nmx)/20; 
  } 
  if (abs(mouseY - nmy) > 1.0) { 
    nmy += (mouseY-nmy)/20; 
  } 
  
  if(mousePressed) { 
    sval += 0.005; 
  } else { 
    sval -= 0.01; 
  } 
  if(sval > 2.5) { sval = 2.5; } 
  if(sval < 1.0) { sval = 1.0; } 
  
  translate(width/2+nmx*sval-100, height/2+nmy*sval-100, -50); 
  scale(sval); 
  rotateZ(PI/9-sval+1.0); 
  rotateX(PI/sval/8-0.125); 
  rotateY(sval/8-0.125); 
  
  translate(-width/2, -height/2, 0); 
  
  float rr, gg, bb, tt; 
  for(int i=0; i<height; i+=res) { 
    for(int j=0; j<width; j+=res) { 
      rr = red(aPixels[j][i]); 
      gg = green(aPixels[j][i]); 
      bb = blue(aPixels[j][i]); 
      tt = rr+gg+bb; 
      stroke(rr, gg, gg); 
      line(i, j, tt/10-20, i, j, tt/10 ); 
    } 
  } 
} 
 
void keyPressed() { 
  if(key == '1') { 
    res = 1; 
  } else if (key == '2') { 
    res = 2; 
  } else if (key == '3') { 
    res = 3; 
  } else if (key == '4') { 
    res = 4; 
  } else if (key == '5') { 
    res = 5; 
  } 
}