在电晕上画和擦(擦)线

Question

我用下面的代码画了一条线

但是我想擦去那行，如果手指碰到同一行…任何想法?

function drawLine( event )
  if(event.phase == "ended") then
    line = display.newLine(event.xStart, event.yStart, event.x, event.y)
    line:setColor(255,0,0)
    line.width = 5
  end
end
Runtime:addEventListener("touch", drawLine)

Answer 1

很简单。将该线设置为传感器，当用户触摸该线时，将其从组中移除或删除该对象。

physics.addBody( line, { isSensor = true } ) 
someGroup:insert(line)
line.collision = removeLine   --some function that removes the line from the group someGroup
line:addEventListener(""touch"", line)