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    move background

    MaxMax Member
    edited May 2014 in General questions
    Hello,
    I have a question again.
    I want, the background of my game to move down until you can't see it anymore.
    But it shouldn't jump out of the screen, it should move. I need this for my game, because it should look like the player is flying. My problem is, that it didn't work with the event enter frame and the background should move without an event like mouse down.
    I tried it, but it didn't work.
    I hope someone can help me.
    Thanks
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    Comments

    • ar2rsawseenar2rsawseen Maintainer
      Here's what I'm using for horizontal movement:
      Scene = Core.class(Sprite)
 
function Scene:init()
    self.roadSpeed = 2
    self.road1 = self:generateRoad()
    self.road2 = self:generateRoad()
    self.road2:setX(self.road1:getX() + self.road1:getWidth())
 
    self:addEventListener(Event.ENTER_FRAME, self.onEnterFrame, self)
end
 
function Scene:generateRoad()
    local road = Bitmap.new(Texture.new("images/road.jpg", true))
    self:addChild(road)
    return road
end
 
function Scene:onEnterFrame()
    self.road1:setX(self.road1:getX()-self.roadSpeed)
    self.road2:setX(self.road2:getX()-self.roadSpeed)
    if(self.road1:getX() + self.road1:getWidth() <= 0) then
        self.road1:setX(self.road2:getX() + self.road2:getWidth())
    end
    if(self.road2:getX() + self.road2:getWidth() <= 0) then
        self.road2:setX(self.road1:getX() + self.road1:getWidth())
    end
end
      http://appcodingeasy.com/Gideros-Mobile
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    • MaxMax Member
      Thanks for your answer :)
      Sorry, for my late answer :(
      I had no time answer (and I forgot it ;)) :(

      This works now, but I have a new problem.
      I wanted to make collision detection between two objects.
      I tried this:

      object1top = object1Image:getY()-object1image:getHeight*0.5
      object1down = object1Image:getY()+object1image:getHeight*0.5

      So I defined the top, down, left and right side of the object.

      And so on (I made the same with object2, too).

      Then I wanted to check if both objects are on collision with each other :

      if object1top <= object2top and (and so on.) then

      end

      But it doesn't work. I got the error, that I compair two nil values.
      If I use == instead of (for example) <=, then it works.


      I hope you can help me
      Thanks :)


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    • MaxMax Member
      And I have another problem:
      The Textobject should display the score, but it doesn't update, so it is always 0.
      How can I update it?
      Thanks :)
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    • ar2rsawseenar2rsawseen Maintainer
      @Max
      you can put this in init.lua (and create init.lua before if you don't have one)
      function Sprite:collidesWith(sprite2)
	local x,y,w,h = self:getBounds(stage)
	local x2,y2,w2,h2 = sprite2:getBounds(stage)
 
	return not ((y+h < y2) or (y > y2+h2) or (x > x2+w2) or (x+w < x2))
end
      And then Sprite and any Sprite inherited object will have a method collidesWith to test for collision with other sprite inherited objects ;)
      http://appcodingeasy.com/Gideros-Mobile
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    • ar2rsawseenar2rsawseen Maintainer
      Updating text object, you simply set it's text value to a new one, like this:
      local text = TextField.new(someFont, "0")
text:setText("1")
      http://appcodingeasy.com/Gideros-Mobile
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    • MaxMax Member
      Thanks for your great help :)

      I don't really understand how the first code works and how I have to implement in my code.
      Thanks :)
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    • ar2rsawseenar2rsawseen Maintainer
      You know what Sprite is?

      basically, create new file in Gideros Studio and call it init.lua
      And copy paste the code there, that will ensure that this code is loaded before any other.

      The code it self is a simply boundary check between two rectangles.

      Then for any object, you can simply use:
      local bmp1 = Bitmap.new(Texture.new("image1.png", true))
local bmp2 = Bitmap.new(Texture.new("image2.png", true))
 
if bmp1:collidesWith(bmp2) then
    --they collide, do something on collision <img class="emoji" src="http://forum.gideros.rocks/resources/emoji/wink.png" title=";)" alt=";)" height="20" />
end
      http://appcodingeasy.com/Gideros-Mobile
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    • MaxMax Member
      I tried it now. I didn't get an error, but nothing happens if my two objects are on collision with each other :(
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    • petecpetec Member
      Did you put anything in the
      if bmp1:collidesWith(bmp2) then
    --they collide, do something on collision 
end
      bit to make something happen? Even just print("bump") would do to see if it's working.
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    • MaxMax Member
      edited June 2014
      It works now :)
      But if object1 is only near object2, you lose the game.
      Can I make the boundaries of my objects smaller than they are?
      Thanks :)
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