LÖVE

Code: Select all

function love.load()
   love.window.setFullscreen(true, "desktop")
   width, height = love.window.getDesktopDimensions(1)
   red = 512
   green = 512
   blue = 512
end

function love.update(dt)
    down = love.keyboard.isDown("escape")
    if down == true then
       love.event.quit() 
    end
    down = love.keyboard.isDown("r")
    if down == true then
        down = love.keyboard.isDown("up")
        if down == true then
            red = red + 1
            if red > 1020 then red = 1020 end
        end
        down = love.keyboard.isDown("down")
        if down == true then
            red = red - 1
            if red < 0 then red = 0 end
        end
    end
    down = love.keyboard.isDown("g")
    if down == true then
        down = love.keyboard.isDown("up")
        if down == true then
            green = green + 1
            if green > 1020 then green = 1020 end
        end
        down = love.keyboard.isDown("down")
        if down == true then
            green = green - 1
            if green < 0 then green = 0 end
        end
    end 
    down = love.keyboard.isDown("b")
    if down == true then
        down = love.keyboard.isDown("up")
        if down == true then
            blue = blue + 1
            if blue > 1020 then blue = 1020 end
        end
        down = love.keyboard.isDown("down")
        if down == true then
            blue = blue - 1
            if blue < 0 then blue = 0 end
        end
    end  
end

function love.draw()
    love.graphics.setColor(1, 0, 0)
    love.graphics.print("Red", width/2-200, height/2-200, 0, 2, 2)
    love.graphics.print(math.floor(red/4), width/2, height/2-200, 0, 2, 2)
    love.graphics.setColor(0, 1, 0)
    love.graphics.print("green", width/2-200, height/2-160, 0, 2, 2)
    love.graphics.print(math.floor(green/4), width/2, height/2-160, 0, 2, 2)    
    love.graphics.setColor(0.24, 0.24, 1)
    love.graphics.print("blue", width/2-200, height/2-120, 0, 2, 2)
    love.graphics.print(math.floor(blue/4), width/2, height/2-120, 0, 2, 2)    

    love.graphics.setColor(red/1020, green/1020, blue/1020)
    love.graphics.rectangle("fill", width/2-200, height/2-80, 400, 400)
end

Code: Select all

-- local variables declared outside of functions are accessible within functions too (within the same .lua file)
-- also, defining them as local variables avoids accumulating a ton of globals (which generally doesn't matter until you're working with multiple files)
local square, ry, gy, by, y = {} -- the empty table gets assigned to square and the rest remain nil variables, but they exist!
love.window.setMode(800, 600, {resizable=true}) -- just showing off how resize works; do whatever you like, of course
local font = love.graphics.newFont(20) -- just to make it easier to read
love.graphics.setFont(font) -- remember to actually use the font  :)
local lineHeight = font:getHeight() -- used to calculate label placement; see https://love2d.org/wiki/Text:getHeight

local red =   255 -- you're using a 0-255 range anyway, so don't bother with extra conversions
local green = 255
local blue =  255

function love.load()
	love.resize(800, 600)
	-- about the only use I have for love.load is to call various init functions after everything is defined and loaded
	-- this same function call could come anytime after love.resize() is defined
	-- if it doesn't get called, then the square (etc) values aren't defined and love.draw() crashes
end

function love.resize(w, h)
    -- this gets called automatically when the window is resized (including if you start in fullscreen mode)
    -- let's use it for all the dimension calculations, rather than re-calculate every frame
    
    -- square
    square.x = math.floor(w / 3)
    square.w = square.x
    square.y = math.floor(h / 3)
    square.h = square.y
    
    -- label positions
    -- we only need the y-value since x is the same for everything
    by = square.y - lineHeight * 2
    gy = by - lineHeight * 1.5
    ry = gy - lineHeight * 1.5
    y = ry - lineHeight * 1.5
end

function love.update(dt)
    -- note that I got rid of the 'down' variable completely, and just use an if structure instead
    
    if love.keyboard.isDown("escape") then love.event.quit() end
    
    -- red
    if love.keyboard.isDown("r") then
        if love.keyboard.isDown("up") and red < 255 then -- instead of changing the variable and then fixing it, let's just make sure it's okay to change it before actually doing so
            red = red + 1
        elseif love.keyboard.isDown("down") and red > 0 then -- use one elseif instead of multiple if blocks. A user *could* press both Up and Down at the same time.
            red = red - 1
        elseif love.keyboard.isDown("pageup") and red < 246 then -- we can use pageup/pagedown to navigate faster too
            red = red + 10
        elseif love.keyboard.isDown("pagedown") and red > 9 then
            red = red - 10
        end
    end
    
    -- green
    if love.keyboard.isDown("g") then
	    -- this isn't really the best way to structure things, but at least it's clear and extensible
        if love.keyboard.isDown("up") and green < 255 then
            green = green + 1
        elseif love.keyboard.isDown("down") and green > 0 then
            green = green - 1
        elseif love.keyboard.isDown("pageup") and green < 246 then
            green = green + 10
        elseif love.keyboard.isDown("pagedown") and green > 9 then
            green = green - 10
        end
    end
    
    -- blue
    if love.keyboard.isDown("b") then
        if love.keyboard.isDown("up") and blue < 255 then
            blue = blue + 1
        elseif love.keyboard.isDown("down") and blue > 0 then
            blue = blue - 1
        elseif love.keyboard.isDown("pageup") and blue < 246 then
            blue = blue + 10
        elseif love.keyboard.isDown("pagedown") and blue > 9 then
            blue = blue - 10
        end
    end
end

function love.draw()
    local label
    
    -- headers
    love.graphics.setColor(1, 1, 1)
    label = "COLOR  INT        HEX    DEC"
    love.graphics.print(label, square.x, y)
    
    -- red
    love.graphics.setColor(1, 0, 0)
    label = "red        "..red.."       0x"..string.format("%x", red).."     "..(red/255)
    -- NOTE: doing a lot of string concatenation is actually bad performance.  It's fine for this, but for performance-critical code it's better to put all the strings in order in a table and then call table.concat(tableName) instead.
    if love.keyboard.isDown("r") then label = label:upper() end
    love.graphics.print(label, square.x, ry)
    
    -- green
    love.graphics.setColor(0, 1, 0)
    label = "green    "..green.."       0x"..string.format("%x", green).."     "..(green/255)
    if love.keyboard.isDown("g") then label = label:upper() end
    love.graphics.print(label, square.x, gy)
    
    -- blue
    love.graphics.setColor(0, 0, 1)
    label = "blue      "..blue.."       0x"..string.format("%x", blue).."     "..(blue/255)
    if love.keyboard.isDown("b") then label = label:upper() end
    love.graphics.print(label, square.x, by)
    
    -- color square
    love.graphics.setColor(red/255, green/255, blue/255)
    love.graphics.rectangle("fill", square.x, square.y, square.w, square.h)
end

Code: Select all

local square = {}
local ry, gy, by, y
love.window.setMode(800, 600, {resizable=true})
local font = love.graphics.newFont(20)
love.graphics.setFont(font)
local lineHeight = font:getHeight()

local red =   255
local green = 255
local blue =  255

local SPEED_NORMAL = 1.0
local SPEED_FAST = 10.0

local actions = {
    changeR = false,
    changeG = false,
    changeB = false,
    positiveSpeed = 0.0,
    negativeSpeed = 0.0,
}


function love.load()
	love.resize(800, 600)
end


function love.resize(w, h)
    square.x = math.floor(w / 3)
    square.w = square.x
    square.y = math.floor(h / 3)
    square.h = square.y

    by = square.y - lineHeight * 2
    gy = by - lineHeight * 1.5
    ry = gy - lineHeight * 1.5
    y = ry - lineHeight * 1.5
end


function love.keypressed(key)
    if key == 'escape' then
        love.event.quit()
    elseif key == 'r' then
        actions.changeR = true
    elseif key == 'g' then
        actions.changeG = true
    elseif key == 'b' then
        actions.changeB = true
    elseif key == 'up' then
        actions.positiveSpeed = SPEED_NORMAL
    elseif key == 'down' then
        actions.negativeSpeed = -SPEED_NORMAL
    elseif key == 'pageup' then
        actions.positiveSpeed = SPEED_FAST
    elseif key == 'pagedown' then
        actions.negativeSpeed = -SPEED_FAST
    end
end


function love.keyreleased(key)
    if key == 'escape' then
        love.event.quit()
    elseif key == 'r' then
        actions.changeR = false
    elseif key == 'g' then
        actions.changeG = false
    elseif key == 'b' then
        actions.changeB = false
    elseif key == 'up' or key == 'pageup' then
        actions.positiveSpeed = 0.0
    elseif key == 'down' or key == 'pagedown' then
        actions.negativeSpeed = 0.0
    end
end


function love.update(dt)
    local colorChangeSpeed = actions.positiveSpeed + actions.negativeSpeed
    
    if actions.changeR then
        red = red + colorChangeSpeed
        if red > 255 then
            red = 255
        elseif red < 0 then
            red = 0
        end
    end
    if actions.changeG then
        green = green + colorChangeSpeed
        if green > 255 then
            green = 255
        elseif green < 0 then
            green = 0
        end
    end
    if actions.changeB then
        blue = blue + colorChangeSpeed
        if blue > 255 then
            blue = 255
        elseif blue < 0 then
            blue = 0
        end
    end
end


function love.draw()
    local label

    love.graphics.setColor(1, 1, 1)
    label = "COLOR  INT        HEX    DEC"
    love.graphics.print(label, square.x, y)

    love.graphics.setColor(1, 0, 0)
    label = "red        "..red.."       0x"..string.format("%x", red).."     "..(red/255)
    if actions.changeR then label = label:upper() end
    love.graphics.print(label, square.x, ry)

    love.graphics.setColor(0, 1, 0)
    label = "green    "..green.."       0x"..string.format("%x", green).."     "..(green/255)
    if actions.changeG then label = label:upper() end
    love.graphics.print(label, square.x, gy)

    love.graphics.setColor(0, 0, 1)
    label = "blue      "..blue.."       0x"..string.format("%x", blue).."     "..(blue/255)
    if actions.changeB then label = label:upper() end
    love.graphics.print(label, square.x, by)

    love.graphics.setColor(red/255, green/255, blue/255)
    love.graphics.rectangle("fill", square.x, square.y, square.w, square.h)
end