Allow square element to be a rectangle

src/painter.py

@@ -215,8 +215,8 @@ class Painter(Widget):
 
             # create new particle
             if touch.button=="right":
-                #new=Cross(touchx,touchy)
-                new=Disk(touchx,touchy)
+                new=Cross(touchx,touchy)
+                #new=Disk(touchx,touchy)
                 # snap to lattice
                 if self.lattice!=None:
                     new.move(self.lattice.nearest_delta(new.elements[0].pos))
@@ -529,7 +529,7 @@ class Painter(Widget):
                 continue
             if particle_type==CROSS_INDEX:
                 candidate=Cross(pos.x,pos.y,color=color)
-            elif particle_type==DISK_INDEX
+            elif particle_type==DISK_INDEX:
                 candidate=Disk(pos.x,pos.y,color=color)
             else:
                 print("warning: ignoring line "+str(i)+" in file '"+file+"': unrecognized particle type: '"+entries[0]+"'",file=sys.stderr)