Checking pixels in tmx files

[szmol96]

I want pixel collision so much, but I don't know what to do...

[HugoBDesigner]

I want pixel collision so much, but I don't know what to do...

The code I gave you is not working? Have you (or me) made something wrong? Because I'm 99% sure this new code should work. Oh, and in this code we check y before x, just so you know...

[szmol96]

I haven't tried it yet, but it looks a bit complicated to me.

[HugoBDesigner]

I haven't tried it yet, but it looks a bit complicated to me.

I tried to make it really simple. All you need to do is replace your current code by this (make a backup, though, for safety):

(I also added comments for better understanding)

On love.load:

Code: Select all

pixelmap = {} -- This is where the pixels will be stored
for y = 1, #map do -- Checks each column
    for x = 1, #map[y] do -- Checks each line
        local a = map[y][x] -- Get the pixel from the map you already have
        if a == 1 then --Checks if the tile is "1" and if it should collide
            pixelmap[x.."-"..y] = true --Adds the tile to the collision detector, so you don't need to check every time
        end
    end
end

On love.update:

Code: Select all

for y = math.max(1, playery-50), math.min(#map, playery+50) do --Checks each column around the player
    for x = math.max(1, playerx-50), math.min(#map[y], playerx+50) do --Checks each line around the player
        if pixelmap[x.."-"..y] then --Checks if the tile can collide
            --your collision code here
        end
    end
end

The rest you already have (I think), so, since you already have a table for the map, it becomes a lot easier to solve problems

[szmol96]

OK, I will see it tomorrow. Thanks for your time and effort.

[szmol96]

I have found an alternate solution. Checking pixels in a 640x480 image doesn't lag, does it? So, I came up with the idea of dividing my map to 640x480 segments and only check the segment the player is currently in. I have made a table of the map segments.

Code: Select all

map = {
	a1 = {
		x = 0,
		y = 0,
		width = 640,
		height = 480,
		image = love.graphics.newImage("img/mapa1.png")
	}
	a2 = {
		x = a1.x + a1.width,
		y = a1.y,
		width = 640,
		height = 480,
		image = love.graphics.newImage("img/mapa2.png")
	}
	b1 = {
		x = a1.x,
		y = a1.y + a1.height,
		width = 640,
		height = 480,
		image = love.graphics.newImage("img/mapb1.png")
	}
	b2 = {
		x = a1.x + a1.width,
		y = a1.y + a1.height,
		width = 640,
		height = 480,
		image = love.graphics.newImage("img/mapb2.png")
	}
}

How can I efficiently return the current map segment? So I could use it in the maskedPixel function.