Ping Pong DX

MoKaLux · March 2019

Please note that I went through some gideros brick game code on github, but he/she wasn't using table + he/she was using box2d which I am not at yet.

SinisterSoft · March 2019

I used the TileMap for the bricks. I just cleared the cell when it was hit.

MoKaLux · March 2019

Thank you sinistersoft. I am almost getting where I want to go with bricks in a table. Right now I am assigning the bricks (sprites) to another table then I should be able to do stage:removeChild(bricks[l][c]). If I can't get it then I will explore the TileMap.

MoKaLux · March 2019

cool that worked:
A

for l = 1, 6 do
	level[l] = {}
	bricks[l] = {}
	for c = 1, 15 do
		level[l][c] = 1
		bricks[l][c] = nil
	end
end

B

local bx, by = 0, 0
for l = 1, 6 do
	bx = 0
	for c = 1, 15 do
		if level[l][c] == 1 then
			local r = Pixel.new(0x00ff00, 0.75, brickwidth - 5, brickheight - 5)
			r:setAnchorPoint(0.5, 0.5)
			r:setPosition(bx, by)
			bricks[l][c] = r
			stage:addChild(r)
		end
		bx = bx + brickwidth
	end
	by = by + brickheight
end

THE COLLISIONS

		-- BRICKS COLLISION
		local c = math.floor(myball:getX() / brickwidth) + 1
		local l = math.floor(myball:getY() / brickheight) + 1
		if c >= 1 and c <= 15 and l >= 1 and l <= #level then
			if level[l][c] == 1 then
				level[l][c] = 0
				print(l..","..c)
--				if bricks[l][c] ~= nil then
					stage:removeChild(bricks[l][c])
--				end
				ballspeedy = - ballspeedy
			end
		end</pre>

The code isn't optimized or anything, I am not a gideros guru yet!
Have fun!

Apollo14 · March 2019

if I understood correctly (sorry if I didn't), you can combine 'getChildAt' and 'removeChildAt' methods

stage:getChildAt(l):removeChildAt(c)

p. s. btw you can shorten lua code with Gideros' mutation operators

--ballspeedy = - ballspeedy
ballspeedy-=ballspeedy
--bx = bx + brickwidth
bx+=brickwidth

MoKaLux · March 2019

hi apollo14, I don't think that would work because sprites position are stored in a two dimension array (x, y) in my case line, column. It may work with a pair but I am not that far yet into lua.

Thank you for the shorten lua code, I will use it from now on.

Have fun you all.

antix · March 2019

Just off the top of my head maybe you could just use another table called "bricks" to store pointers to your brick Pixel objects..

bricks = {}
 
level = {}
for r = 1, 6 do
   local l = {}
   local b = {}
   for c = 1, 15 do
      l[#l + 1] = 1
      b[#b + 1] = nil -- add empty pointer to bricks row
   end
   level[#level + 1] = l
  bricks[#bricks + 1] = b -- save bricks row
end
 
local bx, by = 0, 0
for l = 1, 6 do
   bx = 0
   for c = 1, 15 do
      if level[l][c] == 1 then
        local r = Pixel.new(0x00ff00, 0.75, brickwidth, brickheight)
        r:setAnchorPoint(0.5, 0.5)
        r:setPosition(bx, by)
        stage:addChild(r)
 
        bricks[l][c] = r -- add the brick
 
      end
      bx = bx + brickwidth
   end
   by = by + brickheight
end
 
local c = math.floor(myball:getX() / brickwidth) + 1
local l = math.floor(myball:getY() / brickheight) + 1
if c >= 1 and c <= 15 and l >= 1 and l <= #level then
   if level[l][c] == 1 then
      ballspeedy = - ballspeedy
      level[l][c] = 0
 
      bricks[l][c]:removeFromParent() -- remove brck from stage
      bricks[l][c] = nil -- remove brick from bricks
   end

Note: I didn't test that at all but it should work.. just scream out if it doesn't

MoKaLux · March 2019

thank you antix, I already got my brick game working. I am learning gideros making simple demo apps.

Your code looks kind of what I have: a brick table + a level table. Then I was able to remove a brick, at a given position in the level, upon collision.

Anyway your code is very helpful.

Now I am learning the basics of tilemaps with gideros.

PS: you should show some code in your devblog

Have fun!

antix · March 2019

@MoKaLux Thanks, yes I should have more code in my devblog.. mostly it's a rant about my daily life currently

MoKaLux · March 2019

@antix you seem to be quite a good of a developer indeed! you know that gideros lacks tutorials. So far I have learnt the basics that is: bitmaps (scale, position, ...) + moving a sprite with the keyboard + tables with my pong demo (collisions) + tilemaps.

Right now I am on a plateformer demo (physics).

I am trying to get the best practices as well (using macros, ...) and I may do youtube tutorials, but I am not there quite yet.

See you gideros boy and the others gideros fans!

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