LÖVE

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require 'simple-slider'

function love.load()
    music = love.audio.newSource('music.ogg')
    music:play()

    -- create a new slider
    volumeSlider = newSlider(400, 300, 300, 0.5, 0, 1, function (v) love.audio.setVolume(v) end)
end

function love.update(dt)
    -- update slider, must be called every frame
    volumeSlider:update()
end

function love.draw()
    love.graphics.setBackgroundColor(249, 205, 173)

    love.graphics.setLineWidth(4)
    love.graphics.setColor(254, 67, 101)

    -- draw slider, set color and line style before calling
    volumeSlider:draw()
end

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require 'simple-slider'

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slider = newSlider(x, y, length, value, min, max, setter, style)

    -- x: x position of center of slider
    -- y: y position of center of slider
    -- length: length of slider track
    -- value: initial value for property
    -- min: minimum value for property
    -- max: maximum value for property
    -- setter: function called when slider is updated, supplied with current slider value
    -- style: optional table of style flags
        -- width: width of knob, defaults to 0.1 of slider length
        -- orientation: 'horizontal' or 'vertical', defaults to 'horizontal'
        -- track: track style, 'rectangle' or 'roundrect' or 'line', defaults to 'rectangle'
        -- knob: knob style,  'rectangle' or 'circle', defaults to 'rectangle'

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slider:update()

-- or optionally

slider:update(mouseX, mouseY, mouseDown)

-- (this allows you to supply your own parameters for mouse position and state - useful if your draw calls are being offset, or you want to use a controller for input)

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slider:draw()

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slider:getValue()