// Random Movement 1D

// Display settings
int picLeft = 50;
int picTop = 50;
int picWidth = 300;
int picHeight = 300;

void setup(){
  size(400,450);
  background(204,204,182);
  framerate(10);
  background(204,204,182);
  loadFonts();
  drawTitle();
}
 
void loop(){
  drawPixels();
}

void drawPixels(){
  //draws the pixelarray on screen
  int cl;
  for (int i=0; i<picWidth; i++){
    // calculate new value from neighbour, add error
    if (i==0){ 
      cl = int(red(get(picWidth+picLeft-1, picTop))) + alter();
    }else{
      cl = int(red(get(picLeft+i-1, picTop))) + alter();
    }
    //check boundaries of new value
    cl = max(min(cl,240),0); 
    color c = color(cl,cl,cl+15);
    // drawing
    for (int j=0; j<picHeight; j++){
      // draws pixel line
      set(i+picLeft,j+picTop,c);
      // draws level indicator;
      set(i+picLeft, picTop+picHeight-cl-1, color(255,127,0));
    }
  }
}
  
public int alter(){
   // gives an error value +-
  int n = int(random(4)-2);
  return(n);
}

void drawTitle(){
  // Text Caption
  fill(102,102,102);
  text("_random movement 1D", 195, 420); 
}

void loadFonts(){
  BFont Univers65; 
  Univers65 = loadFont("Univers65.vlw.gz"); 
  textFont(Univers65, 18); 
}