/
powerups.js
64 lines (55 loc) · 1.08 KB
/
powerups.js
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var powerups = [];
var maxPowerups = 3;
var maxPowerupCoolDown = 600;
var powerupCoolDown = 20;
function addPowerup() {
var size = randomBetween(10, 20);
powerups.push({
x: randomX(),
y: -30,
width: size,
height: size,
color: '#881'
});
}
function removePowerup(powerup) {
var i = powerups.indexOf(powerup);
if (i !== -1) {
powerups.splice(i, 1);
}
}
function maybeAddPowerup() {
if (powerups.length >= maxPowerups) {
return;
}
if (randomBetween(0, powerupCoolDown) < 10) {
powerupCoolDown = maxPowerupCoolDown;
addPowerup();
} else {
--powerupCoolDown;
}
}
function updatePowerups() {
for (var i = 0; i < powerups.length; ++i) {
var powerup = powerups[i];
powerup.y += 2;
if (intersects(powerup, player)) {
removePowerup(powerup);
powerupBullets();
}
}
}
function powerupBullets() {
if (maxBulletCoolDown > 5) {
maxBulletCoolDown *= 0.8;
}
}
function maybeRemovePowerup() {
reject(powerups, ifHasRunOffTheBottom);
}
function drawPowerups() {
for (var i = 0; i < powerups.length; ++i) {
var powerup = powerups[i];
fillPiece(powerup);
}
}