Override new function

Comments

• ar2rsawseen Maintainer

  April 2014 edited April 2014

  @dddent due to complections of postInit and some other Class system stuff, you can't override new function, but you can override __new function to achieve same effect:

  Rectangle = Core.class(Sprite)   Rectangle._new = Rectangle.__new   Rectangle.__new = function (x, y, width, height) self = Rectangle._new() self:setX(x) self:setY(y)   self:beginPath() self:setLineStyle(2) self:setFillStyle(Shape.SOLID, 0xFF0000) self:moveTo(0,0) self:lineTo(x,0) self:lineTo(x,y) self:lineto(0,y) self:lineTo(0,0) self:endPath()   return self end   rect = Rectangle.new(50,50,100,100)   stage:addChild(rect)

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• ar2rsawseen Maintainer

  April 2014 Accepted Answer

  But in your case, you could have done simply:

  Rectangle = Core.class(Sprite)   function Rectangle:init(x, y, width, height) self:setX(x) self:setY(y)   self:beginPath() self:setLineStyle(2) self:setFillStyle(Shape.SOLID, 0xFF0000) self:moveTo(0,0) self:lineTo(x,0) self:lineTo(x,y) self:lineto(0,y) self:lineTo(0,0) self:endPath() end   rect = Rectangle.new(50,50,100,100)   stage:addChild(rect)

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• dddent Member

  April 2014 edited April 2014

  @dddent due to complections of postInit and some other Class system stuff, you can't override new function, but you can override __new function to achieve same effect:

  Rectangle = Core.class(Sprite)   Rectangle._new = Rectangle.__new   Rectangle.__new = function (x, y, width, height) self = Rectangle._new() self:setX(x) self:setY(y)   self:beginPath() self:setLineStyle(2) self:setFillStyle(Shape.SOLID, 0xFF0000) self:moveTo(0,0) self:lineTo(x,0) self:lineTo(x,y) self:lineto(0,y) self:lineTo(0,0) self:endPath()   return self end   rect = Rectangle.new(50,50,100,100)   stage:addChild(rect)

  Hmm, I rewrote everything, and then overriding new as in my code worked fine, but I have no idea why it does work now and you saying, that it shouldn't work in the first place makes it even weirder...
  
  I'll post the code, but due to some changes I made, its not working again, I'll post the error below, maybe s.o. can also help me with that:

  Rectangle = Core.class(Shape)   Rectangle.b = Rectangle.new   function Rectangle.new(x,y,width,height, bwidth, bcolor, fcolor) self = Rectangle.b()   self:setX(x) self:setY(y)   self.width = width self.height = height   self.drawbg = function (_bwidth, _bcolor, _fcolor) print(type(_bwidth)) self:beginPath() self:setLineStyle(_bwidth or 1, _bcolor or 0x000000) self:setFillStyle(self.SOLID, _fcolor or 0x505050) self:moveTo(0,0) self:lineTo(self.width,0) self:lineTo(self.width, self.height) self:lineTo(0,self.height) self:lineTo(0,0) self:endPath() end   self.reset = function () self:beginPath() self:setLineStyle(bwidth or 1, bcolor or 0x000000) self:setFillStyle(self.SOLID, fcolor or 0x505050) self:moveTo(0,0) self:lineTo(self.width,0) self:lineTo(self.width, self.height) self:lineTo(0,self.height) self:lineTo(0,0) self:endPath() end   self:drawbg()   return self end

  Error:

  button.lua is uploading. Uploading finished. table button.lua:17: bad argument #1 to 'setLineStyle' (number expected, got table) stack traceback: button.lua:17: in function 'drawbg' button.lua:39: in function 'new' button.lua:50: in function 'new' menu.lua:1: in main chunk

  EDIT: I intentionally didn't pass any arguments to drawbg() to underline, that the error even occurs when nil is passed as an argument for _bwidth, it always is a table...
  

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• ar2rsawseen Maintainer

  April 2014

  @dddent sorry for confusion, I meant that there was an internal __new function, that you have overriden, thus it did not work
  
  about your last error then problem is that you define function with . and use it with :
  
  So
  
  self:drawbg() translates to self.drawbg(self) thus first parameter is always a table
  
  All in all, this should work:

  Rectangle = Core.class(Sprite)   function Rectangle:init(x, y, width, height) self:setX(x) self:setY(y)   self:beginPath() self:setLineStyle(2) self:setFillStyle(Shape.SOLID, 0xFF0000) self:moveTo(0,0) self:lineTo(x,0) self:lineTo(x,y) self:lineto(0,y) self:lineTo(0,0) self:endPath() end   function Rectangle:drawbg(_bwidth, _bcolor, _fcolor) print(type(_bwidth)) self:beginPath() self:setLineStyle(_bwidth or 1, _bcolor or 0x000000) self:setFillStyle(self.SOLID, _fcolor or 0x505050) self:moveTo(0,0) self:lineTo(self.width,0) self:lineTo(self.width, self.height) self:lineTo(0,self.height) self:lineTo(0,0) self:endPath() end   function Rectangle:rest () self:beginPath() self:setLineStyle(bwidth or 1, bcolor or 0x000000) self:setFillStyle(self.SOLID, fcolor or 0x505050) self:moveTo(0,0) self:lineTo(self.width,0) self:lineTo(self.width, self.height) self:lineTo(0,self.height) self:lineTo(0,0) self:endPath() end   rect = Rectangle.new(50,50,100,100) rect:drawbg()   stage:addChild(rect)

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• dddent Member

  April 2014

  Thanks! @ar2rsawseen

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