080 : Node 080
Balthazar:
Move the ball.
// Initialize general game state info.
function init_game() {
var canvas = document.getElementById("stage");
canvas.width = 550;
canvas.height = 400;
_game.width = canvas.width;
_game.height = canvas.height;
// The keymap keeps track of which keys are currently being pressed.
_game.keymap = {};
// How fast the player paddles move.
_game.paddle_speed = 3;
// How fast the ball moves (in x and y direction).
_game.ball_speed = 2;
}
// How fast the ball moves (in x and y direction).
_game.ball_speed = 2;
}
// Initialize ball data.
function init_ball() {
_ball.width = 20;
_ball.height = 20;
_ball.x = (_game.width - _ball.width) / 2.0;
_ball.y = 0;
_ball.velocity_x = 0;
_ball.velocity_y = 0;
_ball.velocity_x = _game.ball_speed;
_ball.velocity_y = _game.ball_speed;
}
_ball.velocity_x = 0;
_ball.velocity_y = 0;
_ball.velocity_x = _game.ball_speed;
_ball.velocity_y = _game.ball_speed;
}
// Handle movement for Player 2.
function update_player2() {
...
}
// Handle ball movement.
function update_ball() {
_ball.x += _ball.velocity_x;
_ball.y += _ball.velocity_y;
}
// Handle ball movement.
function update_ball() {
_ball.x += _ball.velocity_x;
_ball.y += _ball.velocity_y;
}
// This is called ~60 times per second to update the world.
function update_world() {
check_input();
update_player1();
update_player2();
update_ball();
draw();
requestAnimationFrame(update_world);
}
update_ball();
draw();
requestAnimationFrame(update_world);
}