text: var BALL_SPEED = 300;
  var FRAME_RATE = 30;
  var DEG_PER_SECOND_ROTATION = 100;
  var GRASS_TILE_SIZE = 256;
  var STAGE_WIDTH = 640;
  var STAGE_HEIGHT = 480;
  var CIRCLE_DIAMETER = 480;
  var THROW_STANCE_TIME = .7;
  var THROWER_SIZE = 56;
  var CATCHER_WIDTH = 64;
  var CATCHER_OFFSET = 24;
  var THROWER_THROWING_OFFSET = 8;
  var BALL_DIAMETER = 32;
  var TOGGLE_BUTTON_WIDTH = 134;
  var TOGGLE_BUTTON_HEIGHT = 70;
  var ARROW_WIDTH = 42;
  var ARROW_HEIGHT = 142;
  var ARROW_ALPHA_DECAY = 1; // per second