Tincloudly
commented
4 years ago I think you should use the math.ramdon function for that On 14 Jul 2020 01:16, ican002 notifications@github.com wrote: Whenever I try to change the state to the play state, I get an error message saying Error main.lua:42: attempt to call method 'collides' (a nil value). Here's my code so far: main.lua: WINDOW_WIDTH = 1280 WINDOW_HEIGHT = 720 VIRTUAL_WIDTH = 432 VIRTUAL_HEIGHT = 243 PADDLE_SPEED = 200 push = require 'push' Class = require 'class' require 'Ball' require 'Paddle' function love.load() math.randomseed(os.time()) love.graphics.setDefaultFilter('nearest', 'nearest') smallFont = love.graphics.newFont('font.ttf', 8) scoreFont = love.graphics.newFont('font.ttf', 32)
player1Score = 0 player2Score = 0
player1 = Paddle(5, 20, 5, 20) player2 = Paddle(VIRTUAL_WIDTH - 10, VIRTUAL_HEIGHT - 30, 5, 20) ball = Ball(VIRTUAL_WIDTH / 2 - 2, VIRTUAL_HEIGHT / 2 - 2, 5, 5)
gameState = 'start'
push:setupScreen(VIRTUAL_WIDTH, VIRTUAL_HEIGHT, WINDOW_WIDTH, WINDOW_HEIGHT, { fullscreen = false, vsync = true, resizable = false })
end function love.update(dt) if gameState == 'play' then ball:update(dt) if ball:collides(player1) then ball.dx = -ball.dx end if ball:collides(player2) then ball.dx = -ball.dx end if ball.y <= 0 then ball.dy = -ball.dy ball.y = 0 end if ball.y >= VIRTUAL_HEIGHT - 5 then ball.dy = -ball.dy ball.y = VIRTUAL_HEIGHT - 4 end end
player1:update(dt) player2:update(dt)
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
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 function love.keypressed(key) if key == 'escape' then love.event.quit() elseif key == 'enter' or key == 'return' then if gameState == 'start' then gameState = 'play' elseif gameState == 'play' then gameState = 'start' ball:reset() end end
end function love.draw() push:apply('start') love.graphics.clear(40 / 255, 45 / 255, 52 / 255, 255 / 255)
ball:render(VIRTUAL_WIDTH / 2 - 2, VIRTUAL_HEIGHT / 2 - 2, 5, 5) player1:render(5, 20, 5, 20) player2:render(VIRTUAL_WIDTH - 10, VIRTUAL_HEIGHT - 30, 5, 20)
love.graphics.setFont(smallFont)
if gameState == 'start' then
love.graphics.printf(
"Hello, Start State!",
0, 20,
VIRTUAL_WIDTH,
'center')
elseif gameState == 'play' then
love.graphics.printf(
"Hello, Play State!",
0, 20,
VIRTUAL_WIDTH,
'center')
end
love.graphics.setFont(scoreFont)
love.graphics.print(
player1Score,
VIRTUAL_WIDTH / 2 - 50,
VIRTUAL_HEIGHT / 3)
love.graphics.print(
player2Score,
VIRTUAL_WIDTH / 2 + 30,
VIRTUAL_HEIGHT / 3)
displayFPS()
push:apply('end')
end function displayFPS() love.graphics.setColor(0, 1, 0 ,1) love.graphics.setFont(smallFont) love.graphics.print('FPS: ' .. tostring(love.timer.getFPS()), 40, 20) love.graphics.setColor(1, 1, 1, 1) end Ball.lua Ball = Class{} function Ball:init(x, y, width, height) self.x = x self.y = y self.width = width self.height = height self.dx = math.random(2) == 1 and -100 or 100 self.dy = math.random(-50, 50) end function Ball:collides(box) if self.x > box.x + box.width or self.x + self.width < box.x then return false end if self.y > box.y + box.height or self.y + self.height < box.y then return false end return true end function Ball:reset() self.x = VIRTUAL_WIDTH / 2 - 2 self.y = VIRTUAL_HEIGHT / 2 -2 self.dx = math.random(2) == 1 and -100 or 100 self.dy = math.random(-50, 50)
end function Ball:update(dt) self.x = self.x + self.dx dt self.y = self.y + self.dy dt end function Ball:render() love.graphics.rectangle('fill', self.x, self.y, self.width, self.height) end
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Whenever I try to change the state to the play state, I get an error message saying Error main.lua:42: attempt to call method 'collides' (a nil value).
Here's my code so far:
main.lua:
Ball.lua
//edited to fix formatting