我正在制作一个 Lua Love 2d 游戏，我想使用 love.keypressed 函数来进行冲刺。但有一个错误。 我希望我的函数只检测一次，这样我就可以进行破折号。在此处输入图像描述
function love.load()
player = {}
player.x = 400
player.y = 500
player.speedY = 3
player.speedX = 4
player.sprite = love.graphics.newImage('sprites/Spaceship.PNG')
player.lives = 5
player.points = 0
background = love.graphics.newImage('sprites/SpaceBackground.png')
asteroid = {}
asteroid.x = {200, 460, 630}
asteroid.y = {0, 0, 0}
asteroid.speedY = 4
asteroid.sprite = love.graphics.newImage('sprites/Asteroid.png')
asteroid.number = 3
asteroid.missed = 1
bullet = {}
bullet.x = {}
bullet.y = {}
bullet.speed = 11
bullet.sprite = love.graphics.newImage('sprites/bullet.png')
bullet.number = 0
heart = {}
heart.x = {200}
heart.y = {-200}
heart.speed = 4
heart.sprite = love.graphics.newImage('sprites/Heart.png')
heart.number = 1
whenIshotLast = 0
updates = 0
updates2 = 0
updates3 = 0
didAnewAsteroidSpawnSoon = 0
updatesFromLastDashF = 0
didWePressF = 0
end
function areColliding(x1, y1, sx1, sy1, x2, y2, sx2, sy2)
if x2 <= x1 + sx1 and x1 <= x2 + sx2 and y2 <= y1 + sy1 and y1 <= y2 + sy2 then
return true
else
return false
end
end
function love.update(dt)
if(player.lives > 0) then
updates = updates + 1
updates2 = updates2 + 1
updates3 = updates3 + 1
if updates3 > 200 then
player.points = player.points + 1
updates3 = 0
end
if(didWePressF == 1) then
updatesFromLastDashF = updatesFromLastDashF + 1
end
-- Player movement controls
if love.keyboard.isDown("right") or love.keyboard.isDown("d") then
player.x = player.x + player.speedX
end
if love.keyboard.isDown("left") or love.keyboard.isDown("a") then
player.x = player.x - player.speedX
end
if love.keyboard.isDown("down") or love.keyboard.isDown("s") then
player.y = player.y + player.speedY
end
if love.keyboard.isDown("up") or love.keyboard.isDown("w") then
player.y = player.y - player.speedY
end
if(love.keypressed("up", false) or love.keypressed("w", false)) then
didWePressF = 1
if(updatesFromLastDashF < 30) then
player.y = player.y - 50
didWePressF = 0
updatesFromLastDashF = 0
end
end
if(player.y > 525) then
player.y = 525
end
if(player.y < 0)then
player.y = 0
end
if(player.x < 0) then
player.x = 720
end
if(player.x > 720) then
player.x = 0
end
-- Reset shooting cooldown
if updates > 70 then
updates = 0
whenIshotLast = 0
end
if updates2 > 400 then
updates2 = 0
didAnewAsteroidSpawnSoon = 0
end
-- Shooting bullets
if love.keyboard.isDown("space") and whenIshotLast < 1 then
bullet.number = bullet.number + 1
bullet.x[bullet.number] = player.x + 20
bullet.y[bullet.number] = player.y
whenIshotLast = whenIshotLast + 1
end
-- Update asteroid positions
for i = 1, asteroid.number, 1 do
asteroid.y[i] = asteroid.y[i] + asteroid.speedY
if asteroid.y[i] > 600 then
asteroid.y[i] = -500
asteroid.x[i] = math.random(0, 720)
asteroid.missed = asteroid.missed + 1
end
end
for i = 1, heart.number, 1 do
heart.y[i] = heart.y[i] + heart.speed
if(heart.y[i] > 600) then
heart.y[i] = -1200
heart.x[i] = math.random(0, 720)
end
end
-- Check for collisions between asteroids and the player
for i = 1, heart.number, 1 do
if areColliding(heart.x[i], heart.y[i], 3 * 32, 3 * 32, player.x, player.y, 0.6 * 150, 0.6 * 120) then
heart.y[i] = -1200
heart.x[i] = math.random(0, 720)
player.lives = player.lives + 1
end
end
for i = 1, asteroid.number, 1 do
if areColliding(asteroid.x[i], asteroid.y[i], 0.5 * 150, 0.5 * 150, player.x, player.y, 0.6 * 150, 0.6 * 120) then
asteroid.y[i] = -500
asteroid.x[i] = math.random(0, 720)
player.lives = player.lives - 1
end
end
for n = 1, heart.number, 1 do
for i = bullet.number, 1, -1 do
if areColliding(bullet.x[i], bullet.y[i], 32, 32, heart.x[n], heart.y[n], 3 * 32, 3 * 32) then
heart.y[n] = -1200
heart.x[n] = math.random(0, 720)
table.remove(bullet.y, i)
table.remove(bullet.x, i)
bullet.number = bullet.number - 1
player.points = player.points + 2
player.lives = player.lives + 1
end
end
end
-- Check for collisions between bullets and asteroids
for n = 1, asteroid.number, 1 do
for i = bullet.number, 1, -1 do
if areColliding(bullet.x[i], bullet.y[i], 32, 32, asteroid.x[n], asteroid.y[n], 0.5 * 150, 0.5 * 150) then
asteroid.y[n] = -500
asteroid.x[n] = math.random(0, 720)
table.remove(bullet.y, i)
table.remove(bullet.x, i)
bullet.number = bullet.number - 1
player.points = player.points + 3
end
end
end
-- Update bullet positions and remove off-screen bullets
for i = bullet.number, 1, -1 do
bullet.y[i] = bullet.y[i] - bullet.speed
if bullet.y[i] < 0 then
table.remove(bullet.y, i)
table.remove(bullet.x, i)
bullet.number = bullet.number - 1
end
end
if(asteroid.missed % 4 == 0 and didAnewAsteroidSpawnSoon == 0 and asteroid.number < 19) then
asteroid.number = asteroid.number + 1
asteroid.y[asteroid.number] = -500
asteroid.x[asteroid.number] = math.random(0, 720)
asteroid.missed = 0
didAnewAsteroidSpawnSoon = 1
end
end
end
function love.draw()
love.graphics.draw(background, 0, 0, 0, 1, 1.2)
love.graphics.draw(player.sprite, player.x, player.y, 0, 0.6, 0.6)
for i = 1, asteroid.number, 1 do
love.graphics.draw(asteroid.sprite, asteroid.x[i], asteroid.y[i], 0, 0.5, 0.5)
end
for i = 1, bullet.number, 1 do
love.graphics.draw(bullet.sprite, bullet.x[i], bullet.y[i], 0, 1, 1)
end
for i = 1, heart.number, 1 do
love.graphics.draw(heart.sprite, heart.x[i], heart.y[i], 0, 3, 3)
end
love.graphics.print(player.lives, 25, 570, 0, 2, 2)
-- 19
love.graphics.print(player.points, 740, 570, 0, 2, 2)
love.graphics.print(asteroid.number, 740, 0, 0, 2, 2)
if(player.lives == 0) then
love.graphics.print("Loser", 240, 200, 0, 10, 10)
end
end
你能告诉我如何使用love.keypressed功能吗？在此处输入图像描述 [在此处输入图像描述](https://i.sstatic.net/z1jllHg5.png) 你有什么建议吗？
love.keypressed 实际上不会返回任何内容，根据此 它是一个回调函数。每次按下任意键都会触发。
-- old
if(love.keypressed("up",false) or love.keypressed("w",false))then
didWePressF = 1
if(updatesFromLastDashF<30)then
player.y = player.y-50
didWePressF = 0
updatesFromLastDashF = 0
end
end
--new
function love.keypressed(key,code,isrepeat){
-- key:character of the key, code:scancode of the key,isrepeat:if the key is held down
if(not isrepeat) then
--only runs if the keys arent being held
if(code=="up" or code=="w")then
didWePressF = 1
if(updatesFromLastDashF<30)then
player.y = player.y-50
didWePressF = 0
updatesFromLastDashF = 0
end
end
end
}