Scrolling Tile maps

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1

I feel like this has been talked about before, but I can't for the life of me fined a clear answer as to how to do it.

If I'm using tile maps, how do you accomplish infinite scrolling?

2

Look at the lua file 'level.lua' in the 'Level 1-1' example (on Windows: "...\PlaydateSDK\Examples\Level 1-1\Source\level.lua"), the relevant chunk is here:

-- moves the camera horizontally based on player's current position
function Level:updateCameraPosition()
	local newX = floor(max(min(player.position.x - halfDisplayWidth + 60, maxX), minX))
	
	if newX ~= -cameraX then
		cameraX = -newX
		gfx.setDrawOffset(cameraX,0)
		playdate.graphics.sprite.addDirtyRect(newX, 0, displayWidth, displayHeight)	

		:
	end
end
3

I've done a good amount of digging through level.lua already. I don't fully understand it, but I'll give this piece a shot.

4

The only thing this block does is move the whole screen... I don't understand how to use this.
Draw

5

Well, yes, 'moving the whole screen' is part of what it takes to 'do scrolling' :wink: .

Beyond that all I can say is 'look at the Level 1-1 example' - here's some simple X (and Y) camera/player movement/scrolling based on that example:

secundus_rpg_infrastructure_2d_camera

Camera code here:

function Level:updateCameraPosition()
	local newX = floor(max(min(ThePlayer.position.x - halfDisplayWidth, maxX), minX))
	local newY = floor(max(min(ThePlayer.position.y - halfDisplayHeight, maxY), minY))

	if (newX ~= -cameraX) or (newY ~= -cameraY) then
		cameraX = -newX
		cameraY = -newY
		gfx.setDrawOffset(cameraX,cameraY)
		playdate.graphics.sprite.addDirtyRect(newX, newY, displayWidth, displayHeight)
	end
end

Player code here:

function Level:movePlayer()
	if ThePlayer.position.x > MAX_PLAYER_X then	-- fell off of the world! Respawn at the beginning
		ThePlayer.position.x = MAX_PLAYER_X
	end

	if ThePlayer.position.y > MAX_PLAYER_Y then	-- fell off of the world! Respawn at the beginning
		ThePlayer.position.y = MAX_PLAYER_Y
	end

	if ThePlayer.position.y < TILE_SIZE then	-- fell off of the world! Respawn at the beginning
		ThePlayer.position.y = TILE_SIZE
	end

	local collisions, len

	if FirstMovePending == true then
		FirstMovePending = false
		ThePlayer:moveTo(ThePlayer.position.x, ThePlayer.position.y)
		len = 0
	else
		ThePlayer.position.x, ThePlayer.position.y, collisions, len = ThePlayer:moveWithCollisions(ThePlayer.position)
	end

	ThePlayer:setOnGround(true)

	for i = 1, len do

		local c = collisions[i]

		if c.other.isWall == true then
			ThePlayer.velocity.x = 0
		elseif c.other:isa(Coin) then	-- player's collisionResponse returns "overlap" for coins
			self:collectCoin(c.other)
		elseif c.other:isa(Enemy) then
			ThePlayer.velocity.x = 0		-- treat enemies like barriers instead of having them kill player
		end
	end
end