love.wheelmoved

love.wheelmoved

Available since LÖVE 0.10.0
This function is not supported in earlier versions.

Callback function triggered when the mouse wheel is moved.

Function

Synopsis

love.wheelmoved( x, y )

Arguments

number x

Amount of horizontal mouse wheel movement. Positive values indicate movement to the right.

number y

Amount of vertical mouse wheel movement. Positive values indicate upward movement.

Returns

Nothing.

Examples

local text = ""
 
function love.wheelmoved(x, y)
    if y > 0 then
        text = "Mouse wheel moved up"
    elseif y < 0 then
        text = "Mouse wheel moved down"
    end
end
 
function love.draw()
    love.graphics.print(text, 10, 10)
end

Smooth scrolling

function love.load()
    posx, posy = love.graphics.getWidth() * 0.5, love.graphics.getHeight() * 0.5
    velx, vely = 0, 0 -- The scroll velocity
end
 
function love.draw()
    love.graphics.rectangle( 'line', posx, posy, 50, 50 )
end
 
function love.update( dt )
    posx = posx + velx * dt
    posy = posy + vely * dt
 
    -- Gradually reduce the velocity to create smooth scrolling effect.
    velx = velx - velx * math.min( dt * 10, 1 )
    vely = vely - vely * math.min( dt * 10, 1 )
end
 
function love.wheelmoved( dx, dy )
    velx = velx + dx * 20
    vely = vely + dy * 20
end

See Also

• love