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Machine Gun Power-Up
Here we'll learn how to create a power-up effect—one that allows your spaceship to shoot yellow projectiles in a machine gun-like rhythm. We'll utilize event listeners, object properties, timers, and randomization to achieve this effect.
Our checklist for this feature is:
0:00 Create MachineGunPowerUp class
01:44 Render and move across screen
03:28 Add collision detection and splices
06:49 Activate power up and set timer
08:31 Create machine gun effect
11:08 Change projectile color
12:18 Limit machine gun
13:44 Garbage collection
16:12 Spawn in random locations
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Hey, Thanks for this great course!
I have the same problem with continuous space key press acting as machine gun, is there an elegant way to solve this? i tried playing with the keys.space.pressed boolean to no avail.
This does not happen however when playing with the mouse, so theres at least that
Hi ! Thank you for this course/game, it's so cool !
I have a problem, when I keep space bar pressed, that is multiple fire, like the machine gun...
I downloaded your source code to verify but I have the same problem.. I don't understand because you look not have this problem.
Thank you for your help =)
was able to fix repeating space key shooting using
if (e.repeat) { return } it returns a boolean specifically if a keyboard event is happening repeatedly
heres the entire function:
addEventListener("keydown", (e) => {
if (game.over) return;
switch (e.key) {
case "a":
keys.a.pressed = true;
break;
case "d":
keys.d.pressed = true;
break;
case " ":
keys.space.pressed = true;
if (e.repeat) {
return;
}
if (player.powerUp === "MachineGun") return;
if (keys.space.pressed) {
projectiles.push(
new Projectile({
position: {
x: player.position.x + player.width / 2,
y: player.position.y,
},
velocity: {
x: 0,
y: -10,
},
})
);
}
break;
}
});
update: was able to fix repeating space key shooting using
if (e.repeat) { return }it returns a boolean specifically if a keyboard event is happening repeatedly
heres the entire function:
addEventListener("keydown", (e) => { if (game.over) return; switch (e.key) { case "a": keys.a.pressed = true; break; case "d": keys.d.pressed = true; break; case " ": keys.space.pressed = true; if (e.repeat) { return; } if (player.powerUp === "MachineGun") return; if (keys.space.pressed) { projectiles.push( new Projectile({ position: { x: player.position.x + player.width / 2, y: player.position.y, }, velocity: { x: 0, y: -10, }, }) ); } break; } });