Purescript MouseEvent得到x y的鼠标 [英] Purescript MouseEvent to get x y of mouse
问题描述
我是purescript的新手,并试图让鼠标事件上的3D立方体旋转。但我无法在鼠标移动事件中获得鼠标指针的x和y坐标。我附上我的代码,下面有一个事件监听器。有人可以帮助我获取鼠标的x和y坐标,或者可以告诉我为鼠标编写事件监听器的更好方法。
I am new to purescript and was trying to make a 3d cube rotate on mouse events. But I cannot get x and y coordinates of mouse pointer on mouse move event. I am attaching my code below which have a event listener. Can somebody help me in getting x and y coordinates of mouse or can tell me better way to write event listener for mouse.
node <- querySelector "#canvas"
for_ node $ addEventListener "mousedown" $ void do
modifyRef drag \d -> true
xz <- getPageX
log (show xz)
x <- liftEff $ Window.screenX =<< window
y <- liftEff $ Window.screenX =<< window
modifyRef old_x \ox -> toNumber x
modifyRef old_y \oy -> toNumber y
log (show y)
for_ node $ addEventListener "mouseup" $ void do
modifyRef drag \d -> false
for_ node $ addEventListener "mouseout" $ void do
modifyRef drag \d -> false
for_ node $ addEventListener "mousemove" $ void do
--log "Mouse Moved!"
x <- liftEff $ Window.screenX =<< window
y <- liftEff $ Window.screenX =<< window
ox <- readRef old_x
oy <- readRef old_y
modifyRef dX \dx -> (toNumber x - ox) * 2.0 * pi / 600.0
modifyRef dY \dy -> (toNumber y - oy) * 2.0 * pi / 650.0
dx <- readRef dX
dy <- readRef dY
dg <- readRef drag
if dg == true then do
modifyRef alpha \al -> al + dx
modifyRef beta \bt -> bt + dy
modifyRef old_x \ox -> toNumber x
modifyRef old_y \oy -> toNumber y
--modifyRef gamma \ga -> ga + 3.0 * pi/180.0
else
pure unit
推荐答案
您正在使用 window.screenX
和 window.screenY
,其中不是你想要的。您需要使用 <$而是来自 MouseEvent
类型的c $ c> screenX 和 screenY
。
You are using window.screenX
and window.screenY
, which is not what you want. You need to use screenX
and screenY
from the MouseEvent
type instead.
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