Drag flow into view-map

This is pretty awful, but will let me wire up items more easily without
needing to do the big refactor into independent menu handlers

internal/assetstore/map.go

@@ -102,18 +102,27 @@ func (m *Map) SpritesForCell(x, y, z int) ([]*Sprite, error) {
 
 		sprites = append(sprites, sprite)
 	}
-
-	for _, chr := range m.raw.Characters {
-		if chr.XPos == x && chr.YPos == y && z == 1 { // FIXME: sort out ZPos
-			// Look up the correct animation, get the frame, boom
-			anim, err := m.assets.CharacterAnimation(chr.Type, data.AnimActionNone)
-			if err != nil {
-				return nil, err
-			}
-
-			sprites = append(sprites, anim.Frames[0])
+	if chr := m.CharacterAt(x, y, z); chr != nil {
+		// Look up the correct animation, get the frame, boom
+		anim, err := m.assets.CharacterAnimation(chr.Type, data.AnimActionNone)
+		if err != nil {
+			return nil, err
 		}
+
+		sprites = append(sprites, anim.Frames[0])
 	}
 
 	return sprites, nil
 }
+
+func (m *Map) CharacterAt(x, y, z int) *maps.Character {
+	// FIXME: don't iterate
+	for i, _ := range m.raw.Characters {
+		chr := &m.raw.Characters[i]
+		if chr.XPos == x && chr.YPos == y && z == 1 { // FIXME: sort out ZPos
+			return chr
+		}
+	}
+
+	return nil
+}