Moved sprite stuff into media package, removed coupling between miso stuff

and sprite stuff by added some interfaces in the sprite stuff and
implementing them with the miso stuff.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@245 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/miso/tile/TileUtil.java

@@ -0,0 +1,72 @@
+//
+// $Id: TileUtil.java,v 1.1 2001/08/14 23:35:22 mdb Exp $
+
+package com.threerings.miso.tile;
+
+import java.awt.Image;
+
+import com.threerings.media.sprite.AmbulatorySprite;
+import com.threerings.media.sprite.MultiFrameImage;
+import com.threerings.media.sprite.Path;
+
+/**
+ * Tile-related utility functions.
+ */ 
+public class TileUtil
+{
+    /**
+     * Returns an array of multi-frame images corresponding to the frames
+     * of animation used to render the mobile sprite in each of the
+     * directions it may face.  The tileset id referenced must contain
+     * <code>Path.NUM_DIRECTIONS</code> rows of tiles, with each row
+     * containing <code>NUM_DIR_FRAMES</code> tiles.
+     *
+     * @param tilemgr the tile manager to retrieve tiles from.
+     * @param tsid the tileset id containing the sprite tiles.
+     *
+     * @return the array of multi-frame sprite images.
+     */
+    public static MultiFrameImage[] getSpriteFrames (
+        TileManager tilemgr, int tsid)
+    {
+        MultiFrameImage[] anims = new MultiFrameImage[Path.NUM_DIRECTIONS];
+
+        for (int ii = 0; ii < Path.NUM_DIRECTIONS; ii++) {
+            Tile[] tiles = new Tile[NUM_DIR_FRAMES];
+            for (int jj = 0; jj < NUM_DIR_FRAMES; jj++) {
+                int idx = (ii * NUM_DIR_FRAMES) + jj;
+                tiles[jj] = tilemgr.getTile(tsid, idx);
+            }
+            anims[ii] = new MultiTileImage(tiles);
+        }
+
+        return anims;
+    }
+
+    /**
+     * A class that treats an array of tiles as source images for a
+     * multi-frame animation to be used by the sprite engine.
+     */
+    protected static class MultiTileImage implements MultiFrameImage
+    {
+        public MultiTileImage (Tile[] tiles)
+        {
+            _tiles = tiles;
+        }
+
+        public int getFrameCount ()
+        {
+            return _tiles.length;
+        }
+
+        public Image getFrame (int index)
+        {
+            return _tiles[index].img;
+        }
+
+        protected Tile[] _tiles;
+    }
+
+    /** The number of frames of animation for each direction. */
+    protected static final int NUM_DIR_FRAMES = 8;
+}