TILE GAME!

[baconhawka7x]

So I've been reading through the tile-based-scrolling for a while now. And theres only a few parts that i don't understand.

Like.

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function draw_map()
   for y=1, map_display_h do
      for x=1, map_display_w do                                                         
         love.graphics.draw( 
            tile[map[y+map_y][x+map_x]], 
            (x*tile_w)+map_offset_x, 
            (y*tile_h)+map_offset_y )
      end
   end
end

I started out using applescript making stupid little dialog games. So im familiar with "if then" statements. I'm very unfamiliar with "for do" statements.

For example i Don't understand in the line..

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for y=1, map_display_h do

So is it saying that 1 can repeat "map_display_h" number of times? (map_display_h = 10 by the way)

also i really dont understand the line

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tile[map[y+map_y][x+map_x]], 

I really would like to make tile games. please help me!
All Help Is Apreciated!:D


P.S. how would i use more then 1 kind of tile? for example, Lets say i wanted grass, and stone?

[tentus]

The space is there just to make it more legible. The following code is all the same, for example:

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for i=1,bar do foo(i) end
--
for i=1, bar do 
  foo(i )
end
--
for i = 1, bar do
         foo( i )
end

Anyhow, a "for do" statement is a loop, where a number increments (or decrements) each time it happens. Whatever is inside the loop (before the matching end) will be executed a specified number of times. So, in the above examples, foo() will be called bar number of times... let's say five times. You could write the code like this instead:

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foo(1)
foo(2)
foo(3)
foo(4)
foo(5)

But that's really wordy, especially if bar is a much bigger number, say 100 or 1000.

In your case the for loops are going through each row and then column in a grid, whose size is determined by map_display_h and map_display_w.

[kikito]

I recommend you to give a look to my love tile tutorial. There's a chapter 0 with basic concepts, and a section there explaining "the for do statements" (also called "loops").

[baconhawka7x]

I recommend you to give a look to my love tile tutorial. There's a chapter 0 with basic concepts, and a section there explaining "the for do statements" (also called "loops").

Thank you! I'm Still reading, but it is defidently the greatest tutorial about love i've ever read!:D

[Nixola]

Compliments for your tutorial, I (finally) understood the use of "for ... do"!

[kikito]

Thanks!

I will try to finish it ... in the future. Right now I have just too much stuff going on.

[Jack5500]

This is the best tutorial ever. Please finish it. It helped me a lot!

[Kazagha]

This is the best tutorial ever. Please finish it. It helped me a lot!

Ding Dong for that; http://whiteninjacomics.com/comics/munchkins.shtml

[nunix]

So here's a question. In the basics/loops, there are these two blocks of sample code. It seems like if you put them into a main.lua file it should run, but it doesn't; love spits out an error.

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function love.load()
  MyGlobalTable = { 
    { 'Stuff inside a sub-table', 'More stuff inside a sub-table' },
    { 'Stuff inside the second sub-table', 'Even more stuff' }
  }
end

function love.draw()
  for i=1,#MyGlobalTable do
    local subtable = MyGlobalTable[i]
    for j=1,#subtable do   -- nested loop!
      love.graphics.draw(subtable[j], 100 * i, 50 * j)
    end
  end
end

Error is:

[C]: in function 'draw'
main.lua:12:in function 'draw'
[C]: in function 'xpcall'

What's going on? I feel like I almost have a handle on this (and it's definitely the best tile tutorial I've read so far) but I needed to play with some of the sample code to really get it, and this doesn't work. =/

[bartbes]

I spot nothing wrong (but I might be overlooking something), but what I can tell, is that you didn't post the error, but instead the stack trace, useful, but not in this case. Error, please!