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Adding and removing multiple Line shape on the stage — Gideros Forum
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    Adding and removing multiple Line shape on the stage

    Sush19Sush19 Member
    edited August 2013 in General questions
    Hello all, I wanna create a scale kind of thing, in which there is a horizontal line and below this line there are many small vertical lines, which forms scale kind of thing.

    To create this I've written following code:
           function newLine(xPos, yPos, x, y, thikness)
		line = Shape.new()
		line:setLineStyle(thikness, 0x000000, 1)
		line:beginPath()
		line:moveTo(0,0)
		line:lineTo(x, y)
		line:endPath()
		stage:addChild(line)
		line:setPosition(xPos, yPos)
	end
 
        --for horizontal line
	newLine(0, 255, 480, 0, 1)
 
	--for vertical lines
	newLine(150, 256, 0, 5, 2) --line for 0
	newLine(190, 256, 0, 3, 2) --line for 0.5
	newLine(230, 256, 0, 5, 2) --line for 1
	newLine(270, 256, 0, 3, 2) --line for 1.5
	newLine(310, 256, 0, 5, 2) --line for 2
	newLine(350, 256, 0, 3, 2) --line for 2.5
	newLine(390, 256, 0, 5, 2) --line for 3
	newLine(430, 256, 0, 3, 2) --line for 3.5
	newLine(470, 256, 0, 5, 2) --line for 4
 
and so on...
    I want to clear the stage, So can anyone help me out whether what I'm doing is correct, and how to remove all the lines at once from the stage...

    There is only one variable 'line', when i say
    stage:removeChild(line)
    it removes only the last drawn line from the stage....


    Hope my question is clear to all

    thank you...
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    Comments

    • ar2rsawseenar2rsawseen Maintainer
      In each line newLine call you create another Shape object and overwrite previous one inside line variable.
      That is why when you remove it from stage, only last one is removed, because line holds reference to the last created Shape object.

      you could create lineLayer and add all lines to it, then remove this line layer from Stage like this:
      local lineLayer = Sprite.new()
stage:addChild(lineLayer)
 function newLine(xPos, yPos, x, y, thikness)
	line = Shape.new()
	line:setLineStyle(thikness, 0x000000, 1)
	line:beginPath()
	line:moveTo(0,0)
	line:lineTo(x, y)
	line:endPath()
	lineLayer:addChild(line)
	line:setPosition(xPos, yPos)
end
 
--and to remove
stage:removeChild(lineLayer)
      http://appcodingeasy.com/Gideros-Mobile
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    • Sush19Sush19 Member
      Thank you for the reply.....
      similar king of code i was searching for...

      thanks alot =D>
      +1 -1Share on Facebook
    • john26john26 Maintainer
      Also, if you don't have a reference to a sprite you can access by index, so to delete all sprites on stage you can do
         for i=1,stage:getNumChildren() do
       stage:removeChildAt(1)
   end
      each iteration of the loop removes the first child on the stage until none are left.
      http://giderosmobile.com
      https://github.com/gideros/gideros
      https://www.youtube.com/c/JohnBlackburn1975
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    • Sush19Sush19 Member
      Hello @john26, thank you for your response.... :)
      +1 -1Share on Facebook
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