LÖVE

Chad64 wrote:Im using the android port of löve, and i have a problem with at least debugging simple things by touching the screen. i literally copied and pasted this onto main.lua:

Code: Select all

function love.draw()
    local touches = love.touch.getTouches()
 
    for i, id in ipairs(touches) do
        local x, y = love.touch.getPosition(id)
        love.graphics.circle("fill", x, y, 20)
    end
end

.. and i keep getting:

Error

Syntax error: main.lua:41: '=' expected near 'for'

reply me if u want the tracebacks, kinda tired to write em today.

I am new to löve but has an idea how to use any lua. trust me, i have made a windows screensaver like thingy but instead of the logo bouncing around, its a mario.

 tags around your code for clarity and as required by the forum rules. Please add them yourself next time).

Something's missing. That snippet is far less than 41 lines, yet the error says it happens in line 41.

Vimm wrote:How do I set an angle to an object? Basically I have a rectangle that, when the game starts, I want to make move in a random direction, how would I accomplish this?

local vx, vy     -- velocity x, y
local speed = 5  -- 5 pixels/s

function love.load()
  local angle = 2*math.pi*love.math.random()
  vx = math.cos(angle)*speed
  vy = math.sin(angle)*speed
end

function love.update(dt)
  -- add vx*dt and vy*dt to the position x and y respectively
end

pgimeno wrote:

Vimm wrote:How do I set an angle to an object? Basically I have a rectangle that, when the game starts, I want to make move in a random direction, how would I accomplish this?

Create a random angle with 2*math.pi*love.math.random() (that's a random number from 0 to twice pi, which is a whole circle in radians).

Then use the cosine and the sine of the angle times your speed (in pixels/s), to determine the velocity vector to apply each frame. And each frame, multiply it by dt and add the result to the position.

Something like:

Code: Select all

local vx, vy     -- velocity x, y
local speed = 5  -- 5 pixels/s

function love.load()
  local angle = 2*math.pi*love.math.random()
  vx = math.cos(angle)*speed
  vy = math.sin(angle)*speed
end

function love.update(dt)
  -- add vx*dt and vy*dt to the position x and y respectively
end

Something's missing. That snippet is far less than 41 lines, yet the error says it happens in line 41.

Chad64 wrote:The problem with ipairs on love android still lasts tho. And that needs an answer or fix.

Vimm wrote:[Error] attempt to perform arithmetic on global 'vx'(a nil value) :/

pgimeno wrote: That's very weird. That's a very straightforward construct. Make sure no strange characters have slipped into the code.

Chad64 wrote:

pgimeno wrote: That's very weird. That's a very straightforward construct. Make sure no strange characters have slipped into the code.

Well, i did just copy the code from an example at love.touch.getPosition.. so it's not my fault ✌

s-ol wrote:except I did just copy & paste that myself and it works... double check?

Chad64 wrote:

s-ol wrote:except I did just copy & paste that myself and it works... double check?

Still doesn't work. Reverted everything back, main.lua, pasted code, blahblahblah. What platform are you testing it on? it might be just my devices problem too tho..