multiselect region can be drawn with the right mouse button

code/camera.lua

@@ -77,3 +77,16 @@ function Camera:positionAt(x,y)
 	self.pos.y = math.floor((y/self.height)*self.height)
 end
 
+-- translate screen coordinates to game coordinates
+function Camera:ptScreenToGame(pt)
+	return self.pos + pt
+end
+
+function Camera:mouseScreenPos()
+	return Point:new(love.mouse.getX(),love.mouse.getY()) / game.scale
+end
+
+-- return the mouse position as game coordinates
+function Camera:mouseGamePos()
+	return self:ptScreenToGame(self:mouseScreenPos())
+end