// factor in time (time_step), was using frame
// expect faults
// just a guess
var sprinting = 0; // seconds sprinting
var tired = 0; // at sprinting == 300, then sprinting > 0
function sprint() {
if (key_shift && !tired) {
// if moving?
sprinting += time_step * 0.0625;
sprinting = minv(sprinting, 300);
tired = (sprinting >= 300);
player.speed = 60;
} else {
player.speed = 10;
if (tired && !key_shift) { // stop pressing key_shift
sprinting -= time_step * 0.0625;
sprinting = maxv(sprinting, 0);
tired = (sprinting >= 0);
}
}
}