Difference between revisions of "love.wheelmoved"
m (→Arguments) |
m (Add example for smooth scrolling) |
||
Line 26: | Line 26: | ||
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"> | ||
+ | local posx, posy = love.graphics.getWidth() * 0.5, love.graphics.getHeight() * 0.5 | ||
+ | local velx, vely = 0, 0 -- The scroll velocity | ||
+ | |||
+ | function love.draw() | ||
+ | love.graphics.rectangle( 'line', posx, posy, 50, 50 ); | ||
+ | end | ||
+ | |||
+ | function love.update( dt ) | ||
+ | posx = posx + velx | ||
+ | posy = posy + vely | ||
+ | |||
+ | -- Gradually reduce the velocity to create smooth scrolling effect. | ||
+ | velx = velx * 0.95 | ||
+ | vely = vely * 0.95 | ||
+ | end | ||
+ | |||
+ | function love.wheelmoved( dx, dy ) | ||
+ | velx = velx + dx | ||
+ | vely = vely + dy | ||
end | end | ||
</source> | </source> |
Revision as of 12:42, 27 December 2015
Available since LÖVE 0.10.0 |
This function is not supported in earlier versions. |
Callback function triggered when the mouse wheel is moved.
Contents
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
local posx, posy = love.graphics.getWidth() * 0.5, love.graphics.getHeight() * 0.5
local velx, vely = 0, 0 -- The scroll velocity
function love.draw()
love.graphics.rectangle( 'line', posx, posy, 50, 50 );
end
function love.update( dt )
posx = posx + velx
posy = posy + vely
-- Gradually reduce the velocity to create smooth scrolling effect.
velx = velx * 0.95
vely = vely * 0.95
end
function love.wheelmoved( dx, dy )
velx = velx + dx
vely = vely + dy
end
See Also
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