Problems in Pong7 #58
Comments
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I think you should use the math.ramdon function for that On 14 Jul 2020 01:16, ican002 <[email protected]> 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
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