44

int numChars = 26;
color[] colors = new color[numChars];
int keyIndex;
float keyScale;
int rectWidth;

void setup(){
size(200,200);
noStroke();
background(0);
keyScale =200/numChars-1.0;
rectWidth = width/4;
}

void draw(){
if(keyPressed){
if(key >= 'A' && key <= 'z'){
if(key <= 'Z'){
keyIndex = key-'A';

}else{
keyIndex = key-'a';
}
fill(millis()%255);
float beginRect = rectWidth/2 + keyIndex*keyScale-rectWidth/2;
rect(beginRect,0.0,rectWidth,height);
}
}
}