LÖVE

Posted: **Wed Aug 23, 2023 10:49 pm**

Hello! I'm using the lighworld library for lighting, as seen here: https://github.com/tanema/light_world.lua

I followed the example code very closely, and the lights work my map at a scaling of 1 (e.g. no scaling at all), but when I try to scale the map up to 2, the light appears offset improperly with the map. This is my `main.lua` code:

Code: Select all

local Camera = require("lib.camera")
local map = require("scripts.map")

local LightWorld = require("lib.lightworld")

function love.load()
    love.graphics.setBackgroundColor(love.math.colorFromBytes(41, 45, 65))

    love.physics.setMeter(64)
    world = love.physics.newWorld(0, 9.81*64, true)

    windowWidth = love.graphics.getWidth()
    windowHeight = love.graphics.getHeight()

    lightWorld = LightWorld({
        ambient = {0.21, 0.21, 0.21},
    })

    lightMouse = lightWorld:newLight(0, 0, 1, 0.49, 0.24, 300)
    lightMouse:setGlowStrength(0.3)

    map:load()
end

function love.update(dt)
    if love.keyboard.isDown('escape') then love.event.quit() end

    lightWorld:update(dt)
    lightWorld:setTranslation(0, 0, map.scale)
    lightMouse:setPosition(love.mouse.getX(), love.mouse.getY())
end

function love.draw()
    love.graphics.push()

    love.graphics.scale(map.scale)
    lightWorld:draw(function()
        map:draw()
    end)

    love.graphics.pop()
end

and `map.lua`:

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local sti = require("lib.sti")

local map = {
    scale = 2
}

function map:load()
    self.map = sti("maps/testmap.lua")
    
    self.width = self.map.width * self.map.tilewidth * self.scale
    self.height = self.map.height * self.map.tileheight * self.scale

    local solidColliders = {}
    for i, obj in pairs(self.map.layers["Solids"].objects) do
        solidColliders.body = love.physics.newBody(world, (obj.x + obj.width/2) * self.scale, (obj.y + obj.height/2) * self.scale, "static")
        solidColliders.shape = love.physics.newRectangleShape(obj.width * self.scale, obj.height * self.scale)
        solidColliders.fixture = love.physics.newFixture(solidColliders.body, solidColliders.shape)
        solidColliders.fixture:setUserData("Solids")

        lightWorld:newRectangle((obj.x + obj.width/2) * self.scale, (obj.y + obj.height/2) * self.scale, obj.width * self.scale, obj.height * self.scale)

    end
end

function map:draw()
    self.map:drawImageLayer("Map")
end

return map

If someone could help me fix this, that would be great!

Here is the full source and `.love` file that you can try out (scaling is set to 2)

lighting.love: (8.01 MiB) Downloaded 40 times

Posted: **Thu Aug 24, 2023 5:47 am**

I think this happening because you didn't apply scaling offset to your mouse calculations:

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lightMouse:setPosition(love.mouse.getX() / map.scale, love.mouse.getY() / map.scale)

Instead of:

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 lightMouse:setPosition(love.mouse.getX(), love.mouse.getY())

Reason why it worked is because on 1 scale there no offsets happening and if we take formulas above as example:
if mouse x will be 100; 100 * 1 (which is map scale) = 100
if you even slightly change scale, let's say 1.5;
100 * 1.5 = 150 - this is what *corrected* mouse x should look like, but since you didn't applied scaling, you still passing 100 to your lighting library, so it obviously draw light sources on wrong place.

LÖVE

Map isn't scaling properly with lighting

Map isn't scaling properly with lighting

Re: Map isn't scaling properly with lighting