.net barcode generator library open source 11: Isometric Tilemaps in Objective-C

Draw DataMatrix in Objective-C 11: Isometric Tilemaps

CHAPTER 11: Isometric Tilemaps
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Figure 11 6 shows a finely crafted isometric tileset named dg_iso32.png, which contains a good variation of ground floor tiles, object tiles like walls, trees, and houses, as well as adornment objects or items that can be placed on any ground tile. The tiles in this set are each 54x49 pixels in size. The height can be chosen arbitrarily; it can be more or less than 49 pixels and depends on how much overlap between tiles you like in your tilemap. The actual height of the diamond shape is 27 pixels. This will become important when you create the tilemap in Tiled.
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Figure 11 6. David Gervais s finely crafted isometric tileset
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CHAPTER 11: Isometric Tilemaps
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Isometric Tilemap Editing with Tiled
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I ll use the Tiled Map Editor once again to create the isometric tilemap. The basic tilemap editing is the same as with orthogonal maps, but there are certain crucial steps to correctly set up a new isometric tilemap and load an isometric tileset.
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Creating a New Isometric Tilemap
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Open up Tiled and choose File New to bring up the New Map dialog in Figure 11 7. The orientation should obviously be set to Isometric and the Map size is set to 30 tiles wide and high, just right for our example project. The odd thing here is the Tile size width and height, which seem to be off a bit. I already mentioned that the individual tiles in the dg_iso32.png are 54x49 pixels. The size of the diamond shape, which you have to consider when laying down tiles, is 54x27 pixels. Yet the tile size in the New Map dialog is 52x26. This offset is on purpose, because isometric tiles are designed to overlap each other a little. In this case and actually in most other isometric tilesets as well the size of the tiles in the Tiled isometric map must be 2 pixels less wide and 1 pixel less high than the actual size of the diamond shapes in the tileset.
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Figure 11 7. Create a new isometric tilemap in Tiled.
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The goal of this (-2, -1) offset is to have straight lines at the edges of the tilemap and avoid the background showing through. It s necessary because it is impossible to design diamond shapes that are placed at the same distance from each other and do not overlap. If you see any artifacts like the ones in Figure 11 8, you have set the wrong tile size when creating a new isometric map. You can find this erroneous tilemap as isometricno-offset.tmx in the Tilemap05 project s resources folder, for illustration purposes.
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CHAPTER 11: Isometric Tilemaps
Figure 11 8. Artifacts like these indicate a tile-size offset problem.
If you did make a mistake and picked incorrect offsets, and you don t want to lose the tilemap you ve just spent hours designing, or if you have other reasons to want to tweak the tilemap size or tileset size, there s a simple way to do this. The following trick makes it easy to experiment with various offsets until you get it just right. Select the TMX file in your Xcode project and you ll see that it s a plain-text XML file. At the beginning of the file you ll find the map section:
<map version="1.0" orientation="isometric" width="30" height="30" tilewidth="54" tileheight="27">
You can edit the tilewidth and tileheight parameters until you ve found the correct offsets for the tilemap. Likewise, if you re having problems determining the tile size of the isometric tileset you re using, you can modify the tilewidth and tileheight parameters of the tileset(s):
<tileset firstgid="1" name="dg_iso32" tilewidth="54" tileheight="49"> <image source="dg_iso32.png"/> </tileset>
Just make sure to reload the TMX file in Tiled after you made any manual changes to it, because Tiled will not automatically update the file.
Creating a New Isometric Tileset
Next you need to load a tileset containing isometric tiles. For this chapter I will be using the dg_iso32.png tileset image found in the Tilemap05 project s resources folder. In Tiled, choose Map New Tileset and browse to the dg_iso32.png file.
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