// Keyboard Functions 
// by REAS <http://reas.com> 
// Modified from code by Martin 
// Original 'Color Typewriter' concept by John Maeda 

int max_height = 20; 
int min_height = 10; 
int letter_height = max_height; // Height of the letters 
int letter_width = 10;          // Width of the letter 
 
int x = -letter_width;          // X position of the letters 
int y = 0;                      // Y position of the letters 
 
boolean newletter;              
 
int numChars = 26;      // There are 26 characters in the alphabet 
color[] colors = new color[numChars]; 
 
void setup() 
{ 
  size(200, 200); 
  noStroke(); 
  colorMode(RGB, numChars); 
  background(numChars/2); 
  // Set a gray value for each key 
  for(int i=0; i<numChars; i++) { 
    colors[i] = color(i, i, i);    
  } 
} 
 
void draw() 
{ 
  if(newletter == true) { 
    // Draw the "letter" 
    int y_pos; 
    if (letter_height == max_height) { 
      y_pos = y; 
      rect( x, y_pos, letter_width, letter_height ); 
    } else { 
      y_pos = y + min_height; 
      rect( x, y_pos, letter_width, letter_height ); 
      fill(numChars/2); 
      rect( x, y_pos-min_height, letter_width, letter_height ); 
    } 
    newletter = false; 
  } 
} 
 
void keyPressed() 
{ 
  // if the key is between 'A'(65) and 'z'(122) 
  if( key >= 'A' && key <= 'z') { 
    int keyIndex; 
    if(key <= 'Z') { 
      keyIndex = key-'A'; 
      letter_height = max_height; 
      fill(colors[key-'A']); 
    } else { 
      keyIndex = key-'a'; 
      letter_height = min_height; 
      fill(colors[key-'a']); 
    } 
  } else { 
    fill(0); 
    letter_height = 10; 
  } 
 
  newletter = true; 
 
  // Update the "letter" position 
  x = ( x + letter_width ); 
 
  // Wrap horizontally 
  if (x > width - letter_width) { 
    x = 0; 
    y+= max_height; 
  } 
 
  // Wrap vertically 
  if( y > height - letter_height) { 
    y = 0;      // reset y to 0 
  } 
}