LÖVE

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function checkmatches()
	checkx = heightcubes
	for i = 1, heightcubes do
		for i2 = 1, widthcubes do
			if (cubes[checkx][i2] ~= 0) then
				checkingcol = cubes[checkx][i2]
				--Check right
				if (checkx <= (heightcubes - 1)) then
					--Check down directions
				end
				--Check upwards
			end
		checkx = checkx - 1
	end
end

Code: Select all

function checkmatches()
	for cubey = 1, heightcubes do
      for cubex = 1, widthcubes do
         if (cubes[cubex][cubey] ~= 0) then
            
			checkingcol = cubes[cubex][cubey]
            --use dx and dy variables to simulate the directions to be checked
			for dx = -1,1 do -- (down, right, downleft, and downright)
				for dy = 0,1 do
					--special cases that don;t need to be checked
					if not (dx==0 and dy == 0) and not (dx == -1 and dy == 0) then
						
						local rowsize = 1 --how many of this color are in a straight line so far
						while true do
							--find the cube that is, rowsize untis away in direction dx,dy
							local tempx,tempy = cubex+dx*rowsize,cubey+dy*rowsize
							--if out of range, stop now
							if tempx < 1 or tempy < 1 or tempx > #cubes or tempy > #cubes[1] then break end
							 --if same color ,add 1 to rowsize and keep going
							if cubes[tempx][tempy] == checkingcol then rowsize = rowsize + 1
							--if different color, stop now
							else break end
						end
						
						if rowsize >= 3 then
							--found a row of 3 or more items of the same color!
							--do stuff here
						end
						
					end
				end
			end
			
         end
	end
end