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def tick args
args.state.player ||= {x: 600, y: 320, w: 80, h: 80, path: 'sprites/circle-white.png', vx: 0, vy: 0, health: 10, cooldown: 0, score: 0}
args.state.enemies ||= []
args.state.player_bullets ||= []
args.state.tick_count ||= -1
args.state.tick_count += 1
spawn_enemies args
kill_enemies args
move_enemies args
move_bullets args
move_player args
fire_player args
args.state.player[:r] = args.state.player[:g] = args.state.player[:b] = (args.state.player[:health] * 25.5).clamp(0, 255)
label_color = args.state.player[:health] <= 5 ? 255 : 0
args.outputs.labels << [
{
x: args.state.player.x + 40, y: args.state.player.y + 60, alignment_enum: 1, text: "#{args.state.player[:health]} HP",
r: label_color, g: label_color, b: label_color
}, {
x: args.state.player.x + 40, y: args.state.player.y + 40, alignment_enum: 1, text: "#{args.state.player[:score]} PTS",
r: label_color, g: label_color, b: label_color, size_enum: 2 - args.state.player[:score].to_s.length,
}
]
args.outputs.sprites << [args.state.player, args.state.enemies, args.state.player_bullets]
args.state.clear! if args.state.player[:health] < 0 # Reset the game if the player's health drops below zero
end
def spawn_enemies args
# Spawn enemies more frequently as the player's score increases.
if rand < (100+args.state.player[:score])/(10000 + args.state.player[:score]) || args.state.tick_count.zero?
theta = rand * Math::PI * 2
args.state.enemies << {
x: 600 + Math.cos(theta) * 800, y: 320 + Math.sin(theta) * 800, w: 80, h: 80, path: 'sprites/circle-white.png',
r: (256 * rand).floor, g: (256 * rand).floor, b: (256 * rand).floor
}
end
end
def kill_enemies args
args.state.enemies.reject! do |enemy|
# Check if enemy and player are within 80 pixels of each other (i.e. overlapping)
if 6400 > (enemy.x - args.state.player.x) ** 2 + (enemy.y - args.state.player.y) ** 2
# Enemy is touching player. Kill enemy, and reduce player HP by 1.
args.state.player[:health] -= 1
else
args.state.player_bullets.any? do |bullet|
# Check if enemy and bullet are within 50 pixels of each other (i.e. overlapping)
if 2500 > (enemy.x - bullet.x + 30) ** 2 + (enemy.y - bullet.y + 30) ** 2
# Increase player health by one for each enemy killed by a bullet after the first enemy, up to a maximum of 10 HP
args.state.player[:health] += 1 if args.state.player[:health] < 10 && bullet[:kills] > 0
# Keep track of how many enemies have been killed by this particular bullet
bullet[:kills] += 1
# Earn more points by killing multiple enemies with one shot.
args.state.player[:score] += bullet[:kills]
end
end
end
end
end
def move_enemies args
args.state.enemies.each do |enemy|
# Get the angle from the enemy to the player
theta = Math.atan2(enemy.y - args.state.player.y, enemy.x - args.state.player.x)
# Convert the angle to a vector pointing at the player
dx, dy = theta.to_degrees.vector 5
# Move the enemy towards thr player
enemy.x -= dx
enemy.y -= dy
end
end
def move_bullets args
args.state.player_bullets.each do |bullet|
# Move the bullets according to the bullet's velocity
bullet.x += bullet[:vx]
bullet.y += bullet[:vy]
end
args.state.player_bullets.reject! do |bullet|
# Despawn bullets that are outside the screen area
bullet.x < -20 || bullet.y < -20 || bullet.x > 1300 || bullet.y > 740
end
end
def move_player args
# Get the currently held direction.
dx, dy = move_directional_vector args
# Take the weighted average of the old velocities and the desired velocities.
# Since move_directional_vector returns values between -1 and 1,
# and we want to limit the speed to 7.5, we multiply dx and dy by 7.5*0.1 to get 0.75
args.state.player[:vx] = args.state.player[:vx] * 0.9 + dx * 0.75
args.state.player[:vy] = args.state.player[:vy] * 0.9 + dy * 0.75
# Move the player
args.state.player.x += args.state.player[:vx]
args.state.player.y += args.state.player[:vy]
# If the player is about to go out of bounds, put them back in bounds.
args.state.player.x = args.state.player.x.clamp(0, 1201)
args.state.player.y = args.state.player.y.clamp(0, 640)
end
def fire_player args
# Reduce the firing cooldown each tick
args.state.player[:cooldown] -= 1
# If the player is allowed to fire
if args.state.player[:cooldown] <= 0
dx, dy = shoot_directional_vector args # Get the bullet velocity
return if dx == 0 && dy == 0 # If the velocity is zero, the player doesn't want to fire. Therefore, we just return early.
# Add a new bullet to the list of player bullets.
args.state.player_bullets << {
x: args.state.player.x + 30 + 40 * dx,
y: args.state.player.y + 30 + 40 * dy,
w: 20, h: 20,
path: 'sprites/circle-white.png',
r: 0, g: 0, b: 0,
vx: 10 * dx + args.state.player[:vx] / 7.5, vy: 10 * dy + args.state.player[:vy] / 7.5, # Factor in a bit of the player's velocity
kills: 0
}
args.state.player[:cooldown] = 30 # Reset the cooldown
end
end
# Custom function for getting a directional vector just for movement using WASD
def move_directional_vector args
dx = 0
dx += 1 if args.inputs.keyboard.d
dx -= 1 if args.inputs.keyboard.a
dy = 0
dy += 1 if args.inputs.keyboard.w
dy -= 1 if args.inputs.keyboard.s
if dx != 0 && dy != 0
dx *= 0.7071
dy *= 0.7071
end
[dx, dy]
end
# Custom function for getting a directional vector just for shooting using the arrow keys
def shoot_directional_vector args
dx = 0
dx += 1 if args.inputs.keyboard.key_down.right || args.inputs.keyboard.key_held.right
dx -= 1 if args.inputs.keyboard.key_down.left || args.inputs.keyboard.key_held.left
dy = 0
dy += 1 if args.inputs.keyboard.key_down.up || args.inputs.keyboard.key_held.up
dy -= 1 if args.inputs.keyboard.key_down.down || args.inputs.keyboard.key_held.down
if dx != 0 && dy != 0
dx *= 0.7071
dy *= 0.7071
end
[dx, dy]
end
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