//Initialising global variables
PGraphics picture;
int location_x;
int location_y;
int generation=3;
Swarm [] locust;
 
//Setup of main variables
void setup () {
  framerate(1);
  size(500,500,P3D);
  background(199);
  camera(500, 300, (height/2.0) / tan(PI*60.0 / 360.0), width/2.0, height/2.0, 0, 0, 1, 0);
   
  //Loading the image
  picture = createGraphics(width,height,P3D);
  picture.defaults();
  picture.background(255);
   
  //Initial co-ordinates for start of jumps
  location_x=100;
  location_y=100;
   
  //initialising generation
  locust = new Swarm[generation];
   
  for (int i=0; i<generation; i++ ) {
    locust[i] = new Swarm(picture);
  }
}  
   
//Recursive draw method    
void draw () {
   
    //clears the sketch every frame
    background(199);
 
    //starts the process
    for (int i=0; i<generation; i++ ){
 locust[i].live();
 println("ok "+i);
    }    
 
}
 
//Swarm class
class Swarm {
   
  PGraphics pic;
   
  //Constructor
  Swarm (PGraphics back) {
    pic=back;
    }
   
  //main method
  void live () {
 
    //Loading the image's pixels
    loadPixels();
     
    //Initialising variables
    int random1=int(random(0,300));
    int random2=int(random(0,300));
     
    int random_red=int(random(-255,255));
    int random_green=int(random(-255,255));
    int random_blue=int(random(-255,255));
     
    //Getting the random pixel
    int pixel=pic.pixels[random1+random2*pic.width];  
     
    int r=(pixel&0x00FF0000)>>16;
    int g=(pixel&0x0000FF00)>>8;
    int b=pixel&0x000000FF;  
     
    //Setting destination
    int destination_x=random1+99;
    int destination_y=random2+99;
     
    //Setting stroke properties
    int randomstroke=int(random(0,255));
    stroke(randomstroke);
     
    //Drawing the line
    line(location_x,location_y,0,  destination_x,destination_y,0);
     
    location_x=destination_x;
    location_y=destination_y;  
   
    //Changing the pixel's RGB
    r+=random_red;  
    if(r<0)  
 r=0;
    else if (r>255)
  r=255;
     
    g+=random_green;  
    if(g<0)
 g=0;
    else if (g>255)
  g=255;
     
    b+=random_blue;
    if(b<0)
 b=0;
    else if (b>255)
  b=255;
     
    //Storing the change and updating the pixels
    pixel=(pixel&0xFF000000)+(r<<16)+(g<<8)+b;  
    pic.pixels[random1+random2*pic.width]=pixel;  
    pic.updatePixels();  
   
    //Assigning the image to a vertex
    beginShape();  
    noStroke();
    texture(pic);  
     
    vertex(100, 100, 0, 0);  
    vertex(400, 100, 300, 0);  
    vertex(400, 400, 300, 300);  
    vertex(100, 400, 0, 300);  
     
    endShape();
  }
   
}