代码如下，在onTouch里面进行的操作：
function DrawtestScene:onTouch(event, x, y, prex, prey)
if event == “began” then
return true
elseif event == “moved” then
self.m_render_texture:begin()
self:drawTest(x, y, prex, prey)
self.m_render_texture:endToLua()
return true
elseif event == “ended” then
end
end
function DrawtestScene:drawTest(x, y, prex, prey)
local brush = display.newSprite(self.m_brush_path, x, y)
brush:setScale(CommonAPI:getImageScale())
brush:setPosition(cc.p(x, y))
brush:visit()
brush = nil
end
绘制图片的时候会出现间隔，请问怎么做可以避免？