When two sprites occupy the same tile, their screen y coordinate is used

instead of their fine coordinates. It achieves the same effect and
alleviates the need to track fine coordinates in the MisoCharacterSprite.

Additionally, IsoSceneView and friends were modified to allow any sprites
to wander their crooked realms, MisoCharacterSprite instances are simply
more efficient because they maintain cached copies of their tile
coordinates whereas other sprites must have their tile location computed
from their screen location whenever they are to be repainted.

At some point in the future, the tile coordinate tracking facilities of
MisoCharacterSprite should be accessed through an interface so that other
spritely entities can cache their tile coordinates if they so desire.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@1560 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/miso/client/IsoSceneView.java

@@ -1,5 +1,5 @@
 //
-// $Id: IsoSceneView.java,v 1.116 2002/06/29 01:32:28 ray Exp $
+// $Id: IsoSceneView.java,v 1.117 2002/07/08 21:41:30 mdb Exp $
 
 package com.threerings.miso.scene;
 
@@ -26,6 +26,7 @@ import com.samskivert.util.HashIntMap;
 
 import com.threerings.media.RegionManager;
 
+import com.threerings.media.sprite.Sprite;
 import com.threerings.media.sprite.SpriteManager;
 import com.threerings.media.util.Path;
 
@@ -363,15 +364,32 @@ public class IsoSceneView implements SceneView
         _spritemgr.getIntersectingSprites(_dirtySprites, clip);
         int size = _dirtySprites.size();
         for (int ii = 0; ii < size; ii++) {
-            MisoCharacterSprite sprite = (MisoCharacterSprite)
-                _dirtySprites.get(ii);
+            Sprite sprite = (Sprite)_dirtySprites.get(ii);
             Rectangle bounds = sprite.getBounds();
             if (!bounds.intersects(clip)) {
                 continue;
             }
 
-            _dirtyItems.appendDirtySprite(
-                sprite, sprite.getTileX(), sprite.getTileY());
+            // if this is a miso character sprite, we can use its cached
+            // tile coordinates
+            int tx, ty;
+            if (sprite instanceof MisoCharacterSprite) {
+                MisoCharacterSprite mcs = (MisoCharacterSprite)sprite;
+                tx = mcs.getTileX();
+                ty = mcs.getTileY();
+
+            } else {
+                // otherwise we have to compute them from the screen
+                // coordinates of the sprite
+                IsoUtil.screenToTile(
+                    _model, sprite.getX(), sprite.getY(), _tcoords);
+                tx = _tcoords.x;
+                ty = _tcoords.y;
+            }
+
+            // finally add the sprite and its tile coordinates to the list
+            // of dirty items
+            _dirtyItems.appendDirtySprite(sprite, tx, ty);
             // Log.info("Dirtied item: " + sprite);
         }
 
@@ -683,6 +701,9 @@ public class IsoSceneView implements SceneView
     /** Used when rendering tiles. */
     protected Rectangle _tbounds;
 
+    /** Used when dirtying sprites. */
+    protected Point _tcoords = new Point();
+
     /** Used to collect the list of sprites "hit" by a particular mouse
      * location. */
     protected List _hitSprites = new ArrayList();