如何解决为什么我的上电没有显示在我的LOVE2D游戏中？
我目前正在做一个名为PlayBall的Pong Remake，这是一个彩色版本，具有通电，模式和新功能。我现在使用的是Alpha 2.0（Powerup概念），我想将我的第一个Powerup称为AddBall。
此功能的作用是当球与球碰撞时，会产生一个新球。
我在AddBall.lua中设置了代码：
AddBall = Class{}
local spawner = math.random(10,20)
function AddBall:init(x,y)
self.x = x
self.y = y
self.width = 8
self.height = 8
self.timer = 0
self.inPlay = false
end
function AddBall:collides(ball)
-- first,check to see if the left edge of either is farther to the right
-- than the right edge of the other
if self.x > ball.x + ball.width or ball.x > self.x + self.width then
return false
end
-- then check to see if the bottom edge of either is higher than the top
-- edge of the other
if self.y > ball.y + ball.height or ball.y > self.y + self.height then
return false
end
-- if the above aren't true,they're overlapping
return true
end
function AddBall:update(dt)
self.timer = self.timer + dt
if self.timer > spawner then
self.inPlay = true
end
if self.inPlay then
self:render()
end
end
function AddBall:render()
love.graphics.draw(textures['powerups'],frames['powerups'][1],self.x,self.y)
end
function AddBall:reset()
self.timer = 0
self.inPlay = false
spawner = math.random(10,20)
end
这是我做的最好的。然后，我在main.lua中分配了一大堆东西来加载道具和第二球：
--[[
Called just once at the beginning of the game; used to set up
game objects,variables,etc. and prepare the game world.
]]
function love.load()
-- set love's default filter to "nearest-neighbor",which essentially
-- means there will be no filtering of pixels (blurriness),which is
-- important for a nice crisp,2D look
love.graphics.setDefaultFilter('nearest','nearest')
-- set the title of our application window
love.window.setTitle('PlayBall')
-- seed the RNG so that calls to random are always random
math.randomseed(os.time())
-- initialize our nice-looking retro text fonts
smallFont = love.graphics.newFont('font.ttf',8)
largeFont = love.graphics.newFont('font.ttf',16)
scoreFont = love.graphics.newFont('font.ttf',32)
love.graphics.setFont(smallFont)
-- set up our sound effects; later,we can just index this table and
-- call each entry's `play` method
sounds = {
['paddle_hit'] = love.audio.newSource('sounds/paddle_hit.wav','static'),['score'] = love.audio.newSource('sounds/score.wav',['wall_hit'] = love.audio.newSource('sounds/wall_hit.wav','static')
}
textures = {
['powerups'] = love.graphics.newImage('graphics/powerups.png')
}
frames = {
['powerups'] = GenerateQuadsPowerups(textures['powerups'])
}
-- initialize our virtual resolution,which will be rendered within our
-- actual window no matter its dimensions
push:setupScreen(VIRTUAL_WIDTH,VIRTUAL_HEIGHT,WINDOW_WIDTH,WINDOW_HEIGHT,{
fullscreen = false,resizable = true,vsync = true
})
-- initialize our player paddles; make them global so that they can be
-- detected by other functions and modules
player1 = Paddle(10,30,5,20)
player2 = Paddle(VIRTUAL_WIDTH - 10,VIRTUAL_HEIGHT - 30,20)
-- place a ball in the middle of the screen
ball1 = Ball(VIRTUAL_WIDTH / 2 - 2,VIRTUAL_HEIGHT / 2 - 2,4,1)
ball2 = Ball(ball1.x,ball1.y,2)
powerup1 = AddBall(math.random(20,VIRTUAL_WIDTH - 20),math.random(0,VIRTUAL_HEIGHT - 8))
-- set up in play to ensure it is in game
ball1.inPlay = true
-- initialize score variables
player1Score = 0
player2Score = 0
-- either going to be 1 or 2; whomever is scored on gets to serve the
-- following turn
servingPlayer = 1
-- player who won the game; not set to a proper value until we reach
-- that state in the game
winningPlayer = 0
-- the state of our game; can be any of the following:
-- 1. 'start' (the beginning of the game,before first serve)
-- 2. 'serve' (waiting on a key press to serve the ball)
-- 3. 'play' (the ball is in play,bouncing between paddles)
-- 4. 'done' (the game is over,with a victor,ready for restart)
gameState = 'start'
end
然后游戏更新：
--[[
Called every frame,passing in `dt` since the last frame. `dt`
is short for `deltaTime` and is measured in seconds. Multiplying
this by any changes we wish to make in our game will allow our
game to perform consistently across all hardware; otherwise,any
changes we make will be applied as fast as possible and will vary
across system hardware.
]]
function love.update(dt)
if gameState == 'serve' then
-- before switching to play,initialize ball's velocity based
-- on player who last scored
ball1.dy = math.random(-50,50)
if servingPlayer == 1 then
ball1.dx = math.random(140,200)
else
ball1.dx = -math.random(140,200)
end
elseif gameState == 'play' then
-- detect ball collision with paddles,reversing dx if true and
-- slightly increasing it,then altering the dy based on the position
-- at which it collided,then playing a sound effect
if ball1:collides(player1) then
ball1.dx = -ball1.dx * 1.03
ball1.x = player1.x + 5
-- keep velocity going in the same direction,but randomize it
if ball1.dy < 0 then
ball1.dy = -math.random(10,150)
else
ball1.dy = math.random(10,150)
end
sounds['paddle_hit']:play()
end
if ball1:collides(player2) then
ball1.dx = -ball1.dx * 1.03
ball1.x = player2.x - 4
-- keep velocity going in the same direction,150)
end
sounds['paddle_hit']:play()
end
if ball2:collides(player1) then
ball2.dx = -ball2.dx * 1.03
ball2.x = player1.x + 5
-- keep velocity going in the same direction,but randomize it
if ball2.dy < 0 then
ball2.dy = -math.random(10,150)
else
ball2.dy = math.random(10,150)
end
sounds['paddle_hit']:play()
end
if ball2:collides(player2) then
ball2.dx = -ball2.dx * 1.03
ball2.x = player2.x - 4
-- keep velocity going in the same direction,150)
end
sounds['paddle_hit']:play()
end
-- detect upper and lower screen boundary collision,playing a sound
-- effect and reversing dy if true
if ball1.y <= 0 then
ball1.y = 0
ball1.dy = -ball1.dy
sounds['wall_hit']:play()
end
-- -4 to account for the ball's size
if ball1.y >= VIRTUAL_HEIGHT - 4 then
ball1.y = VIRTUAL_HEIGHT - 4
ball1.dy = -ball1.dy
sounds['wall_hit']:play()
end
-- detect upper and lower screen boundary collision,playing a sound
-- effect and reversing dy if true
if ball2.y <= 0 then
ball2.y = 0
ball2.dy = -ball2.dy
sounds['wall_hit']:play()
end
-- -4 to account for the ball's size
if ball2.y >= VIRTUAL_HEIGHT - 4 then
ball2.y = VIRTUAL_HEIGHT - 4
ball2.dy = -ball2.dy
sounds['wall_hit']:play()
end
-- if we reach the left edge of the screen,go back to serve
-- and update the score and serving player
if ball1.x < 0 then
servingPlayer = 1
player2Score = player2Score + 1
sounds['score']:play()
-- if we've reached a score of 10,the game is over; set the
-- state to done so we can show the victory message
if player2Score == 10 then
winningPlayer = 2
gameState = 'done'
else
gameState = 'serve'
-- places the ball in the middle of the screen,no velocity
ball1:reset()
end
end
-- if we reach the right edge of the screen,go back to serve
-- and update the score and serving player
if ball1.x > VIRTUAL_WIDTH then
servingPlayer = 2
player1Score = player1Score + 1
sounds['score']:play()
-- if we've reached a score of 10,the game is over; set the
-- state to done so we can show the victory message
if player1Score == 10 then
winningPlayer = 1
gameState = 'done'
else
gameState = 'serve'
-- places the ball in the middle of the screen,no velocity
ball1:reset()
end
end
-- check if ball powerup is added
if powerup1:collides(ball1) then
ball2.inPlay = true
ball2:update(dt)
powerup1:reset()
end
-- ball 2 is resetted when it hits the edge
if ball2.x < 0 or ball2.x > VIRTUAL_WIDTH then
ball2.inPlay = false
end
end
--
-- paddles can move no matter what state we're in
--
-- player 1
if love.keyboard.isDown('w') then
player1.dy = -PADDLE_SPEED
elseif love.keyboard.isDown('s') then
player1.dy = PADDLE_SPEED
else
player1.dy = 0
end
-- player 2
if aiMode == true then
player2.y = ball1.y
elseif aiMode == false then
if love.keyboard.isDown('up') then
player2.dy = -PADDLE_SPEED
elseif love.keyboard.isDown('down') then
player2.dy = PADDLE_SPEED
else
player2.dy = 0
end
end
-- update our ball based on its DX and DY only if we're in play state;
-- scale the velocity by dt so movement is framerate-independent
if gameState == 'play' then
ball1:update(dt)
end
player1:update(dt)
player2:update(dt)
powerup1:update(dt)
end
我的问题是通电不会产生，从而使通电概念不完整。我不确定是否导致渲染问题，或者计时不顺利。
我的猜测是我在Ball.lua上遇到了问题：
Ball = Class{}
function Ball:init(x,y,width,height,num)
self.x = x
self.y = y
self.width = width
self.height = height
self.count = num
-- these variables are for keeping track of our velocity on both the
-- X and Y axis,since the ball can move in two dimensions
self.dy = 0
self.dx = 0
self.inPlay = false
end
--[[
Expects a paddle as an argument and returns true or false,depending
on whether their rectangles overlap.
]]
function Ball:collides(paddle)
-- first,check to see if the left edge of either is farther to the right
-- than the right edge of the other
if self.x > paddle.x + paddle.width or paddle.x > self.x + self.width then
return false
end
-- then check to see if the bottom edge of either is higher than the top
-- edge of the other
if self.y > paddle.y + paddle.height or paddle.y > self.y + self.height then
return false
end
-- if the above aren't true,they're overlapping
return true
end
--[[
Places the ball in the middle of the screen,with no movement.
]]
function Ball:reset()
self.x = VIRTUAL_WIDTH / 2 - 2
self.y = VIRTUAL_HEIGHT / 2 - 2
self.dx = 0
self.dy = 0
end
function Ball:update(dt)
self.x = self.x + self.dx * dt
self.y = self.y + self.dy * dt
end
function Ball:render()
if self.inPlay then
love.graphics.setFont(smallFont)
love.graphics.setColor(0/255,0/255,255/255)
love.graphics.printf(tostring(self.count),2,self.y - 8,VIRTUAL_WIDTH,'center')
love.graphics.rectangle('fill',self.x + 2,self.y + 2,self.width,self.height)
love.graphics.setColor(255/255,255/255,self.y - 10,self.y,self.height)
end
end
或者在AddBall.lua中，但是我的力量不会产生。你能告诉我为什么吗？
如果您想仔细看的话，我会将这些东西发布在GitHub上，我的AddBall功能是绿色的十字形。
解决方法
我认为这是因为您只有在通电与ball1冲突时才更新ball2。由于您是用update方法渲染球的，因此只有在更新时（如果没有更新），您才能看到它。
我建议您宁愿这样做：
if ball2.inPlay then
ball2:update(dt)
end
您说您的加电没有显示。可能是因为您出于这种原因未在powerup1:render()中调用love.draw。尝试更新生成道具和球的概念，因为您需要以某种方式进行渲染。
尝试这样：
if powerup1.inPlay then
powerup1:render()
end
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