0

嗨，我有这个从天上掉下云的小生成功能。

local randomBad1 = function()
    local badC1 = display.newImage("BCloud1.png")
    badC1.x = math.random (0, 450); badC1.y = -50
    physics.addBody( badC1, { density=.1, bounce=0.1, friction=.2, radius=45, filter=badc1CollisionFilter } )
    badC1.name = "BCloud1"    
    badC1.isSensor = true
    badC1.rotation = math.random(-20,20) -- Rotate the object
    badC1.gravityScale = 0.40
    local cleanup
    cleanup = function()
       if badC1 then
           if badC1.y >600 then
               badC1:removeSelf()
               badC1 = nil
           end
       end
    end
    Runtime:addEventListener("enterFrame", cleanup)
end
randomBadC1 = timer.performWithDelay( 3000, randomBad1, 0 )

所以我想知道是否有更好的方法来改变下降速度而不是'gravityScale'？

凯文-

4

2 回答 2

2

你可以用applyForce云来做到这一点。我在您的代码中添加了如下几行：

local randomBad1 = function()
  local badC1 = display.newImage("BCloud1.png")
  badC1.x = math.random (0, 450); badC1.y = 50-- -50
  physics.addBody( badC1, { density=.1, bounce=0.1, friction=.2, radius=45, filter=badc1CollisionFilter } )
  badC1.name = "BCloud1"    
  badC1.isSensor = true
  badC1.rotation = math.random(-20,20) -- Rotate the object

  -------------------------------------------------------------------
            -- These lines will do it for you --
  -------------------------------------------------------------------
  yFor  = math.random(1000)   -- choosing a random y directional Force
  print("yFor = "..yFor)
  badC1:applyForce( 0, yFor, badC1.x, badC1.y )  -- apply the force to your cloud 
  -------------------------------------------------------------------

  badC1.gravityScale = 0.40
  local cleanup
  cleanup = function()
   if badC1 then
       if badC1.y >600 then
           badC1:removeSelf()
           badC1 = nil
       end
   end
end
Runtime:addEventListener("enterFrame", cleanup)
end
randomBadC1 = timer.performWithDelay( 3000, randomBad1, 0 )

更多信息，您可以参考：Corona Physics Body Properties。

继续编码............ :)

于 2013-07-08T19:00:31.323 回答
0

如果云是唯一下落的物体，我会完全改变重力。

physics.setGravity( gx, gy )
于 2013-07-08T18:19:27.123 回答