Tile based scrolling

[Robin]

Yea that distance code makes more sense now, Though I still don't understand what you mean about changing the player position. If I change the player position (meaning affect his x/y) then wouldn't that mess with the scrolling then?

Why? It would still have the same effect, as long as you make the "camera" depend on the player position.

[Ryne]

Why? It would still have the same effect, as long as you make the "camera" depend on the player position.

Thank's again for the reply, though I'm still lost. I guess I don't understand the code enough to work with it. I don't know how to do any of the things you suggested. I didn't know there was any camera in place, nor do I know how to force it to player position.. I appreciate the help though I think I'm sort of a lost cause on this one.

[Robin]

I didn't know there was any camera in place,

The "camera" is just the offset at which you draw things. (Would you share a .love so we can help you a bit better?)
I believe the variables were called map_x and map_y.

nor do I know how to force it to player position..

Code: Select all

-- this in love.update, after the player position is changed:
map_x = player.x
map_y = player.y

A better solution would be to use the player x/y for the offset.

I appreciate the help though I think I'm sort of a lost cause on this one.

I don't think so.

[Ryne]

I didn't know there was any camera in place,

The "camera" is just the offset at which you draw things. (Would you share a .love so we can help you a bit better?)
I believe the variables were called map_x and map_y.

nor do I know how to force it to player position..

Code: Select all

-- this in love.update, after the player position is changed:
map_x = player.x
map_y = player.y

A better solution would be to use the player x/y for the offset.

I appreciate the help though I think I'm sort of a lost cause on this one.

I don't think so.

I'm a little secretive of my game so far, luckily I have been working on vastly different graphics the last few days. I also haven't had a chance to fix my code, with the thing's you guys have posted so far (like the enemies updating). Anyway, here it is, ugly as ever.

http://dl.dropbox.com/u/7905642/Simon%2 ... simon.love

I also added "+ 16" to "offset_x" so that it would stop clipping the map on the left side of the screen. In case that causes issues with anything.

[Robin]

So… it works?

[tentus]

You have some power of 2 problems. An easy fix is to require this code:

Code: Select all

do
	local newimage = love.graphics.newImage
	function love.graphics.newImage(source)
		if type(source) == "string" then
			source = love.image.newImageData(source)
		end
		local width = source:getWidth()
		local height = source:getHeight()
		local powerwidth = math.pow(2, math.ceil(math.log(width)/math.log(2)))
		local powerheight = math.pow(2, math.ceil(math.log(height)/math.log(2)))
		if powerwidth ~= width or powerheight ~= height then
			local padded = love.image.newImageData(powerwidth, powerheight)
			padded:paste(source, 0, 0)
			return newimage(padded)
		end
		return newimage(source)
	end
end

[Ryne]

So… it works?

No, this is what I was talking about. The player and the enemies seem to be placed fine / all of the tile based stuff seems for work. Though now my "follow the player" code is broken.

This:

Code: Select all

for i=1, #enemies do
		if not CheckCollision(player, enemies[i]) and Distance(player, enemies[i]) then
			-- the vector from enemy to the player
			local vx = player.x - enemies[i].x
			local vy = player.y - enemies[i].y

			-- normalize it, i.e. divide it by it's length
			local length = math.sqrt(vx * vx + vy * vy)
			vx = vx / length
			vy = vy / length

			-- move the zombie towards the player
			enemies[i].x = enemies[i].x + vx * enemies[i].speed * dt
			-- enemies[i].y = enemies[i].y + vy * enemies[i].speed * dt
		end
		
		if CheckCollision(player, enemies[i]) and enemies[i].dir == "left" then
		enemies[i].anim = eanim.idleleft
		
		elseif CheckCollision(player, enemies[i]) and enemies[i].dir == "right" then
		enemies[i].anim = eanim.idleright
		end
	end	

You have some power of 2 problems. An easy fix is to require this code:

What exact problem does that fix? Just so I know.

[Ryne]

So… it works?

No, this is what I was talking about. The player and the enemies seem to be placed fine / all of the tile based stuff seems for work. Though now my "follow the player" code is broken.

This:

Code: Select all

for i=1, #enemies do
		if not CheckCollision(player, enemies[i]) and Distance(player, enemies[i]) then
			-- the vector from enemy to the player
			local vx = player.x - enemies[i].x
			local vy = player.y - enemies[i].y

			-- normalize it, i.e. divide it by it's length
			local length = math.sqrt(vx * vx + vy * vy)
			vx = vx / length
			vy = vy / length

			-- move the zombie towards the player
			enemies[i].x = enemies[i].x + vx * enemies[i].speed * dt
			-- enemies[i].y = enemies[i].y + vy * enemies[i].speed * dt
		end
		
		if CheckCollision(player, enemies[i]) and enemies[i].dir == "left" then
		enemies[i].anim = eanim.idleleft
		
		elseif CheckCollision(player, enemies[i]) and enemies[i].dir == "right" then
		enemies[i].anim = eanim.idleright
		end
	end	

You have some power of 2 problems. An easy fix is to require this code:

What exact problem does that fix, and what do you mean by "power of 2 problems"? Just so I know.

[TechnoCat]

You have some power of 2 problems. An easy fix is to require this code:

What exact problem does that fix, and what do you mean by "power of 2 problems"? Just so I know.

http://love2d.org/wiki/PO2_Syndrome

[Ryne]

You have some power of 2 problems. An easy fix is to require this code:

What exact problem does that fix, and what do you mean by "power of 2 problems"? Just so I know.

http://love2d.org/wiki/PO2_Syndrome

Oh right, I misunderstood "divisible by 2" for "power of 2". My mistake. Though that code make my player/enemy images blink on and off?