Levels/Enemies for a Top-Down Shooter
Author
I'm making a top-down 2D shooter in C++ and I stopped working on it a while ago because I got stuck with how to do this and haven't come back to it til now.
It's a top-down shooter like any old one from the genre where you play as some guy walking along killing other guys.
Basically, I need a way of creating, saving and loading different levels with relative ease and as little tedium as possible. A level's info will consist of the amount and type of tiles as well as the various enemies, items etc. that populate that level.
XML seems pretty great for this so far in that it'd be good to set up where the enemies in a level are and what kind of enemy they are etc. However, would XML work just as well for creating a 2D tile map? I obviously don't want to have to type in how each tile is going to look in an XML file. That was alright for Pac-man in a txt file but this is more complicated.
I know how to make a basic graphical level editor (more or less, I saw how on that JNRDev site) but would it be pretty easy to transfer that concept to XML? Or would I be better just using some kind of text file or binary file? The levels will be longish vertical scrolling rectangles and being able to just "paint" the terrain in with a level editor and have it save properly into an XML file would be great.
So, 1 XML file for enemy info, 1 for items, 1 for the map. Sound good? How might I save the map in an XML file? It's been too long since I coded last and I probably can't quite think as well as I should ¬_¬
Thanks.
Your main problem, as I understand, involves saving map tiles into XML file. You also don't know how to approach creating a graphical map editor.
Fortunately, there is a solution for both of your problems. There is a 2D tilemap editor called "Tiled" (http://mapeditor.org/index.html). It saves its maps in XML format (although not with .xml extension). I don't know the level of support it has for saving entities with custom data (like enemies or items), but you can look it up in their docs. The tiles themselves it saves in a binary-encoded format within the XML file - the reason this is possible is because it encodes everything into a string, and strings are quite valid in XML.
You can also lookup "Mappy", which is another graphical 2D tilemap editor. On their page, they also list other 2D map editors (of which Tiled is one).
Fortunately, there is a solution for both of your problems. There is a 2D tilemap editor called "Tiled" (http://mapeditor.org/index.html). It saves its maps in XML format (although not with .xml extension). I don't know the level of support it has for saving entities with custom data (like enemies or items), but you can look it up in their docs. The tiles themselves it saves in a binary-encoded format within the XML file - the reason this is possible is because it encodes everything into a string, and strings are quite valid in XML.
You can also lookup "Mappy", which is another graphical 2D tilemap editor. On their page, they also list other 2D map editors (of which Tiled is one).
In a 2d platform test I did once I tried an approach that I liked.
With a little work in the platform engine I added some functions to do hit testing with the mouse and a little user interface. Then when I was playing the platform I could in any time stop the game, enter the editing mode and change the tiles on the fly.
Then I resumed the game and continued to play.
To save I did just a fwrite of the map as a binary file.
With a little work in the platform engine I added some functions to do hit testing with the mouse and a little user interface. Then when I was playing the platform I could in any time stop the game, enter the editing mode and change the tiles on the fly.
Then I resumed the game and continued to play.
To save I did just a fwrite of the map as a binary file.
Author
Alright cool, I think I'll use XML for enemies and stuff and fwrite on a binary for the maps then.
Just a bit of clarification though on how to do it exactly...
Let's say I want to make a 50x100 map. Tiles have a position, type and height.
Do I just do a for loop writing tiles[0][0] - tiles[49][99] by using fwrite on the type and height, then reading them in in the same order? So I just plop down [0][0]'s type & height then [0][1]'s type and height etc.
We actually did some very similar things with Java in college last year on binary files but damnit your brain goes to mush when you haven't been coding for weeks or months :(
Just a bit of clarification though on how to do it exactly...
Let's say I want to make a 50x100 map. Tiles have a position, type and height.
Do I just do a for loop writing tiles[0][0] - tiles[49][99] by using fwrite on the type and height, then reading them in in the same order? So I just plop down [0][0]'s type & height then [0][1]'s type and height etc.
We actually did some very similar things with Java in college last year on binary files but damnit your brain goes to mush when you haven't been coding for weeks or months :(
Quote:Original post by Sean_Seanston
Just a bit of clarification though on how to do it exactly...
Let's say I want to make a 50x100 map. Tiles have a position, type and height.
Do I just do a for loop writing tiles[0][0] - tiles[49][99] by using fwrite on the type and height, then reading them in in the same order? So I just plop down [0][0]'s type & height then [0][1]'s type and height etc.
Sure you can do in this way.
Or you can also just do a single fread/fwrite.
Like this:
struct sTile{ float m_vPosX; float m_vPosY; float m_fHeight; DWORD m_dwType;};struct sLevel{ sTile m_sTiles[50][100];};[...]sLevel Level;FILE* f;// write examplef = fopen("c:\\level.x", "wb");// write header herefwrite(Level.m_sTiles, 1, sizeof(sLevel), f);[...]// read examplef = fopen("c:\\level.x", "rb");// read header herefread(Level.m_sTiles, 1, sizeof(sLevel), f);[...]Since you probably will add other data in the future (for example you could do multiple planes of tiles or new cool things) remember to add an header with the version in this binary file.
By checking the version you can load old map files without problems.
Hi
Here's my map file format in xml :
Have a look at my engine for more informations
Here's my map file format in xml :
<?xml version="1.0" encoding="us-ascii" standalone="yes"?><bank> <level name="Level1_1"> <collisionlayer name="collision" /> <layer name="tiles"> <visibility value="True" /> <zindex value="0" /> <alpha value="255" /> <script name="Level1_1" /> <spawnpoint name="player1"> <position x="164" y="387" /> </spawnpoint> <entity name="RocketMan3"> <position x="616" y="293" /> <model name="RocketMan" /> </entity> <entity name="FlyingDude1"> <position x="2720" y="327" /> <model name="FlyingDude" /> </entity> <entity name="FlyingDude2"> <position x="3766" y="203" /> <model name="FlyingDude" /> </entity> <entity name="RocketMan4"> <position x="3022" y="388" /> <model name="RocketMan" /> </entity> <entity name="FlyingDude3"> <position x="3404" y="139" /> <model name="FlyingDude" /> </entity> <entity name="Player"> <position x="162" y="418" /> <model name="Ruff" /> </entity> <entity name="RocketMan1"> <position x="1457" y="292" /> <model name="RocketMan" /> </entity> <entity name="RocketMan2"> <position x="2446" y="451" /> <model name="RocketMan" /> </entity> <entity name="FlyingDude4"> <position x="1763" y="155" /> <model name="FlyingDude" /> </entity> <tiles width="130" height="24" texture="Level1_1" blockwidth="16" blockheight="16"> <zoom width="2" height="2" /> <row id="0">0 1 2 3 4 5 6 7 4 5 4 8 9 10 11 12 13 14 15 16 17 10 11 18 9 19 16 17 20 10 11 18 9 21 15 17 20 21 22 23 24 25 8 19 26 27 27 28 29 30 31 32 33 34 35 30 31 32 36 37 38 34 35 39 40 41 42 32 36 41 42 39 40 41 42 32 36 43 40 41 42 34 35 34 35 39 40 37 38 34 35 39 40 43 40 44 45 14 46 47 48 49 20 50 51 52 53 25 54 55 56 4 8 57 5 0 1 2 3 4 5 4 5 12 13 10 11 0 1 2 </row> <row id="1">41 42 32 36 43 40 43 40 37 38 58 59 26 60 20 14 61 62 63 63 63 64 20 9 21 65 63 63 16 17 20 9 21 15 63 63 64 46 47 66 48 49 15 65 63 63 63 67 20 25 5 4 5 12 11 4 5 0 1 2 3 4 5 0 1 2 3 0 1 2 3 0 1 2 3 0 1 68 69 2 3 4 5 4 5 0 1 2 3 4 5 0 1 68 69 2 3 70 71 72 73 63 74 75 76 77 78 79 80 81 82 28 9 83 35 30 31 84 33 39 40 37 38 85 86 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1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 </row> </tiles> </layer> </level></bank>Have a look at my engine for more informations
Author
Ok cool, thanks everyone, I think I have a good idea of what to do now.
One last thing though: I have different game states for the title screen, menu, intro screen etc. If I'm making levels with XML or binary files, should I just make a single GamePlay state or something like that which reads in a level and then based on what level it is does blah blah blah ?
Yeah, that seems to make sense. It's just hard to know sometimes >_>
One last thing though: I have different game states for the title screen, menu, intro screen etc. If I'm making levels with XML or binary files, should I just make a single GamePlay state or something like that which reads in a level and then based on what level it is does blah blah blah ?
Yeah, that seems to make sense. It's just hard to know sometimes >_>
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