Removing objects with events

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• antix Member

  June 2016 edited June 2016 Accepted Answer

  Just looking at your code quickly it seems that there is no checking to see which match got dropped into which box. I remade your code as an example of how this might work..
  
  All Boxes and Matches are now subclasses of Shape and only Matches capture any mouse events. When creating a Match, it gets passed a table containing all of all boxes.
  
  Whenever a Match receives a MouseUp event, it checks each box in the table and if it was released inside a box (and the box has the same id), then it removes its self from the stage (also removing the label, shape data, and event listeners).
  
  I hope you can follow the example and find it of some use

  local boxes = {}   table.insert(boxes, Box.new(25, 350, 0xffbb15, 1)) table.insert(boxes, Box.new(175, 350, 0xa2bb15, 2))   for i = 1, 3 do Match.new(1, boxes) end   for i = 1, 3 do Match.new(2, boxes) end

  Box = Core.class(Shape)   function Box:init(x, y, color, id) self.id = id   self:setLineStyle(3, 0x000000) self:setFillStyle(Shape.SOLID, color, 0.5) self:beginPath() self:moveTo(0, 0) self:lineTo(120, 0) self:lineTo(120, 50) self:lineTo(0, 50) self:closePath() self:endPath() self:setPosition(x, y)   -- Create the label and attach it to the shape local label = TextField.new(nil, id) label:setPosition(self:getWidth()/2 - label:getWidth()/2, self:getHeight()/2 + label:getHeight()/2) self:addChild(label)   stage:addChild(self) -- add everything to the stage   return self end

  Match = Core.class(Shape)   function Match:init(id, boxes) self.id = id self.boxes = boxes   self:setLineStyle(3, 0x000000) self:setFillStyle(Shape.SOLID, 0xff0000, 0.5) self:beginPath() self:moveTo(0, 0) self:lineTo(100, 0) self:lineTo(100, 25) self:lineTo(0, 25) self:closePath() self:endPath() self:setPosition(math.random(0, 240 - 50), math.random(0, 340 - 50))   -- Create the label and attach it to the shape local label = TextField.new(nil, id) label:setPosition(self:getWidth()/2 - label:getWidth()/2, self:getHeight()/2 + label:getHeight()/2) self:addChild(label)   stage:addChild(self) -- add everything to the stage   self.isFocus = false self.enabled = true   self:addEventListener(Event.MOUSE_DOWN, self.onMouseDown, self) self:addEventListener(Event.MOUSE_MOVE, self.onMouseMove, self) self:addEventListener(Event.MOUSE_UP, self.onMouseUp, self)   return self end   function Match:onMouseDown(event) if not self.enabled then return end if self:hitTestPoint(event.x, event.y) then self.isFocus = true event:stopPropagation()   self.x0 = event.x self.y0 = event.y end end   function Match:onMouseMove(event) if not self.enabled then return end if self.isFocus then event:stopPropagation()   local dx = event.x - self.x0 local dy = event.y - self.y0   self:setX(self:getX() + dx) self:setY(self:getY() + dy)   self.x0 = event.x self.y0 = event.y end end   function Match:onMouseUp(event) if not self.enabled then return end   -- Return true if point is inside rect local function pointinrect(x1, y1, x2, y2, w, h) return x1 >= x2 and y1 >= y2 and x1 <= x2 + w and y1 <= y2 + h end   if self.isFocus then self.isFocus = false event:stopPropagation()   local boxes = self.boxes -- Check each box against this match for i = 1, #boxes do local box = boxes[i] local x, y, w, h = box:getBounds(stage) if pointinrect(self.x0, self.y0, x, y, w, h) then if box.id == self.id then   print("Match Dropped in box with same id")   self.enabled = false self:removeEventListener(Event.MOUSE_DOWN, self.onMouseDown, self) -- remove event listeners self:removeEventListener(Event.MOUSE_MOVE, self.onMouseMove, self) self:removeEventListener(Event.MOUSE_UP, self.onMouseUp, self) self:removeChildAt(1) -- remove label self:clear() -- get rid of all shape stuff self:removeFromParent() -- remove from parent (stage) else   print("Match dropped into wrong box")   end end end end end

  Likes: Thuwiz

  Match 2.zip 2.8K

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• Thuwiz Member

  June 2016

  @antix, thank you so much for the detailed explanation! Sorry for the newbie questions it's not been too long since I get my head around with game programming
  
  Thanks again.

  English isn’t my first language, so please excuse any mistakes.

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