AfflictionNetworks/narya
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Pick tiles pseudo randomly based on the coordinates.

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git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@1052 542714f4-19e9-0310-aa3c-eee0fc999fb1
This commit is contained in:
Michael Bayne
2002-02-19 20:02:16 +00:00
parent 1ae28e9942
commit a54339594c
1 changed files with 17 additions and 7 deletions
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tests/src/java/com/threerings/miso/client/ScrollingScene.java
+17 -7
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@@ -1,8 +1,10 @@
// //
// $Id: ScrollingScene.java,v 1.1 2002/02/17 23:48:38 mdb Exp $ // $Id: ScrollingScene.java,v 1.2 2002/02/19 20:02:16 mdb Exp $
package com.threerings.miso.scene; package com.threerings.miso.scene;
import java.util.Random;
import com.threerings.media.tile.NoSuchTileException; import com.threerings.media.tile.NoSuchTileException;
import com.threerings.media.tile.NoSuchTileSetException; import com.threerings.media.tile.NoSuchTileSetException;
import com.threerings.media.tile.ObjectTile; import com.threerings.media.tile.ObjectTile;
@@ -20,16 +22,19 @@ public class ScrollingScene implements DisplayMisoScene
throws NoSuchTileSetException, NoSuchTileException throws NoSuchTileSetException, NoSuchTileException
{ {
// grab our four repeating tiles // grab our four repeating tiles
_tiles[0] = (BaseTile)ctx.getTileManager().getTile(11, 0); _tiles[0] = (BaseTile)ctx.getTileManager().getTile(15, 0);
_tiles[1] = (BaseTile)ctx.getTileManager().getTile(12, 0); _tiles[1] = (BaseTile)ctx.getTileManager().getTile(15, 1);
_tiles[2] = (BaseTile)ctx.getTileManager().getTile(13, 0); _tiles[2] = (BaseTile)ctx.getTileManager().getTile(15, 2);
_tiles[3] = (BaseTile)ctx.getTileManager().getTile(14, 0); _tiles[3] = (BaseTile)ctx.getTileManager().getTile(15, 3);
_tiles[4] = (BaseTile)ctx.getTileManager().getTile(15, 4);
} }
// documentation inherited from interface // documentation inherited from interface
public BaseTile getBaseTile (int x, int y) public BaseTile getBaseTile (int x, int y)
{ {
int tidx = 2 * (Math.abs(x) % 2) + Math.abs(y) % 2; long seed = ((x^y) ^ multiplier) & mask;
long hash = (seed * multiplier + addend) & mask;
int tidx = (int)((hash >> 10) % 5);
return _tiles[tidx]; return _tiles[tidx];
} }
@@ -51,5 +56,10 @@ public class ScrollingScene implements DisplayMisoScene
return null; return null;
} }
protected BaseTile[] _tiles = new BaseTile[4]; protected BaseTile[] _tiles = new BaseTile[5];
protected Random _rand = new Random();
protected final static long multiplier = 0x5DEECE66DL;
protected final static long addend = 0xBL;
protected final static long mask = (1L << 48) - 1;
} }