如何在Corona SDK中检测到TouchOut事件? [英] How do I detect a TouchOut event in Corona SDK?

问题描述

在我的电晕游戏中，我在屏幕的角落放置了一个操纵杆图形.

I have a joystick graphic placed in the corner of the screen in my Corona game.

当用户触摸操纵杆并将其左右拖动时，它将移动角色.但是，如果用户从操纵杆中间一直拖动到侧面，然后移开他/她的手指，角色将继续移动.我希望角色停止进行修饰，即使不再在操纵杆图形上进行修饰.

When the user touches the joystick and drags it from side-to-side, it moves the character. However, if the user drags from the middle of the joystick all the way off to the side, then removes his/her finger, the character keeps on moving. I'd like the character to stop on touch-up, even if the touch up is no longer on the joystick graphic.

操纵杆图像通过control:addEventListener( "touch", onTouch )订阅触摸"侦听器.

The joystick image subscribes to the "touch" listener with control:addEventListener( "touch", onTouch ).

下面的操纵杆代码:

-- Constants
local playerSpeed = 300
local playerDamping = 15

-- Player controls
local onTouch = function( event )

    -- Player rotation
    local deltaX = event.x - control.x
    local deltaY = event.y - control.y
    local magnitude = math.sqrt( deltaX * deltaX + deltaY * deltaY )

    player.rotation = math.deg( math.atan2 ( deltaY, deltaX ) )

    -- Player speed
    if event.phase == "ended" then
        player.linearDamping = playerDamping
    else
        player.linearDamping = 0
        player:setLinearVelocity( deltaX / magnitude * playerSpeed, deltaY / magnitude * playerSpeed )
    end
end

有什么想法吗?谢谢！

推荐答案

添加:

if event.phase == "began" then
    display.getCurrentStage():setFocus( control, event.id )
end

onTouch函数的正文，以订阅触摸结束"事件，即使用户的手指不在操纵杆上也是如此.

to the body of the onTouch function, to subscribe to the 'touch ended' event, even when the user's finger isn't on the joystick.

这篇关于如何在Corona SDK中检测到TouchOut事件?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！