Difference between revisions of "love.wheelmoved"

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function love.draw()
 
function love.draw()
 
     love.graphics.print(text, 10, 10)
 
     love.graphics.print(text, 10, 10)
 +
end
 +
</source>
 +
 +
 +
=== Smooth scrolling ===
 +
<source lang="lua">
 +
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
 
end
 
</source>
 
</source>
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[[Category:Callbacks]]
 
[[Category:Callbacks]]
 
{{#set:Description=Callback function triggered when the mouse wheel is moved.}}
 
{{#set:Description=Callback function triggered when the mouse wheel is moved.}}
{{#set:Subcategory=General}}
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{{#set:Subcategory=Mouse}}
 
== Other Languages ==
 
== Other Languages ==
 
{{i18n|love.wheelmoved}}
 
{{i18n|love.wheelmoved}}

Latest revision as of 22:29, 7 March 2019

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


Other Languages