// Creating multibit register display code

// Class Register8 is a class to store and display an 8-bit register

Register8 myRegister;
int j;                   // Standard issue i

void setup() {
  size(256,200);
  background(0,164,64);
  myRegister = new Register8();
  myRegister.xpos = 0;
  myRegister.ypos = 0;
//  myRegister.value = 15;
//  myRegister.display();
}

void draw() {
//  myRegister.value = j;
//  println("myRegister.value = " + myRegister.value);
  myRegister.display(mouseX);
}  

void mousePressed() {
  redraw();
}

class Register8 {
   float xpos;    // Upper left X position of register
   float ypos;    // Upper left Y position of register
   color oncolor; // Color of lit bit indicator
   color offcolor; // Color of unlit bit indicator
   color outline;  // Color of rectangle and indicator outlines
   color bgcolor;  // Color of rectangle background
   color bitcolor; // Color selected for this bit
   float bitxpos;  // Xpos of particular bit
   int value;      // Value of this 8-bit register
   int i; //Local i

  Register8() {  // Register 8 Constructor [DEPRECATED] I like using the class.vars
   xpos = 0;
   ypos = 0;
   oncolor = color(0,255,0);
   offcolor = color(64,92,64);
   outline = color(0,0,0);
   bgcolor = color(64,64,64);
   bitcolor = 0;
   bitxpos = 0;
   value = 0;
   i = 0;
  }

   void display( int t_value ) {
     value = t_value;
     stroke(outline);
     fill(bgcolor);
     rect(xpos,ypos,160,20);
     ellipseMode(CORNER);
     for ( i = 0; i < 8; i++ ) {
       if ( (value & (1 << i)) != 0 ) {
//         println (" value != 0");
         bitcolor = oncolor;
       } else {
//         println (" value = 0");
         bitcolor = offcolor;
       }
       fill(bitcolor);
       bitxpos = (xpos + 160) - ((i+1) * 20);
       ellipse(bitxpos, ypos, 20, 20);
     }
   }
}