Helps if our screen to iso-space transformation is accurate.

git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@971 ed5b42cb-e716-0410-a449-f6a68f950b19
2010-08-10 22:48:27 +00:00
parent 57f020afb8
commit 4a60bbe64a
1 changed files with 19 additions and 0 deletions
@@ -21,11 +21,30 @@ public class MisoMetricsTransformation implements IAxonometricTransformation
        var zx :int = int(Math.floor(screenPt.x / _metrics.tilewid));
        var zy :int = int(Math.floor(screenPt.y / _metrics.tilehei));

+        // these are the screen coordinates of the tile's top
+        var ox :int = (zx * _metrics.tilewid);
+        var oy :int = (zy * _metrics.tilehei);
+
        // these are the tile coordinates
        tpos.x = zy + zx;
        tpos.y = zy - zx;
        tpos.z = 0;

+        // these are the tile coordinates
+        tpos.x = zy + zx; tpos.y = zy - zx;
+
+        // now determine which of the four tiles our point occupies
+        var dx :int = screenPt.x - ox;
+        var dy :int = screenPt.y - oy;
+
+        if (Math.round(_metrics.slopeY * dx + _metrics.tilehei) <= dy) {
+            tpos.x += 1;
+        }
+
+        if (Math.round(_metrics.slopeX * dx) > dy) {
+            tpos.y -= 1;
+        }
+
        return tpos;
    }