/**
* Keyboard Functions
* by Martin Gomez
*
* Click on the window to give it focus and press the letter keys to type colors.
* The keyboard function keyPressed() is called whenever
* a key is pressed. keyReleased() is another keyboard
* function that is called when a key is released.
*
* Original 'Color Typewriter' concept by John Maeda.
*/

int maxHeight = 40;
int minHeight = 20;
int letterHeight = maxHeight; // Height of the letters
int letterWidth = 20; // Width of the letter

int x = -letterWidth; // 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(640, 360);
noStroke();
colorMode(HSB, numChars);
background(numChars/2);
// Set a hue value for each key
for(int i = 0; i < numChars; i++) {
colors[i] = color(i, numChars, numChars);
}
}

void draw() {
if(newletter == true) {
// Draw the "letter"
int y_pos;
if (letterHeight == maxHeight) {
y_pos = y;
rect( x, y_pos, letterWidth, letterHeight );
} else {
y_pos = y + minHeight;
rect( x, y_pos, letterWidth, letterHeight );
fill(numChars/2);
rect( x, y_pos-minHeight, letterWidth, letterHeight );
}
newletter = false;
}
}

void keyPressed()
{
// If the key is between 'A'(65) to 'Z' and 'a' to 'z'(122)
if((key >= 'A' && key <= 'Z') || (key >= 'a' && key <= 'z')) {
int keyIndex;
if(key <= 'Z') {
keyIndex = key-'A';
letterHeight = maxHeight;
fill(colors[keyIndex]);
} else {
keyIndex = key-'a';
letterHeight = minHeight;
fill(colors[keyIndex]);
}
} else {
fill(0);
letterHeight = 10;
}

newletter = true;

// Update the "letter" position
x = ( x + letterWidth );

// Wrap horizontally
if (x > width - letterWidth) {
x = 0;
y+= maxHeight;
}

// Wrap vertically
if( y > height - letterHeight) {
y = 0; // reset y to 0
}
}