/* built with Studio Sketchpad: 
 *   https://sketchpad.cc
 * 
 * observe the evolution of this sketch: 
 *   https://studio.sketchpad.cc/sp/pad/view/ro.u8hl3h6juUv/rev.2
 * 
 * authors: 
 *   GoToLoop

 * license (unless otherwise specified): 
 *   creative commons attribution-share alike 3.0 license.
 *   https://creativecommons.org/licenses/by-sa/3.0/ 
 */ 



/**
 * KeyReleased Example
 * by  TFGuy44 (2013/May)
 * mod GoToLoop
 *
 * http://forum.processing.org/topic/help-with-key-released
 * 
 */

final static byte NUM_KEYS_DOWN = 'Z' - 'A' + 1;
final static boolean[] keysDown = new boolean[NUM_KEYS_DOWN];

final static byte  GAP = 15, BOLD = 2;
final static color BG = #4080A0, FG = #F0F040;

void setup() {
  size(NUM_KEYS_DOWN*GAP - GAP + BOLD*2, 150, P2D);
  noLoop();

  stroke(FG);
  strokeWeight(BOLD);
}

void draw() {
  background(BG);

  for (int i = 0; i != NUM_KEYS_DOWN; ++i)
    if (keysDown[i])
      line(i*GAP + BOLD, 0, i*GAP + BOLD, height);
}

void keyPressed() {
  redraw();

  final int k = keyCode;

  if (k >= 'A' & k <= 'Z')
    keysDown[k-'A'] = !keysDown[k-'A'];
}

void keyReleased() {
  keyPressed();
}