XorGramana ALPHA (0.0.6)

In this release of XorGramana, things are nearly all working. The first level, "Newbies Request" is fully playable, while the second level "My Race Mud" is only half-designed - coming stuck upon the fact that not everything is working (ie bomb detonation checks for gravitating objects does not handle the new up-rising and right-running objects).

Another development is the icons for objects now have 'indicators' overlaid representing the object's behavioural characteristics. A long blue arrow represents the direction the object will 'gravitate' given the chance (don't get in their way). A long red arrow represents the orientation of a bomb object's blast (ie horizontal or vertical). A single green stubby arrow means that the object can be pushed one block at a time in that direction. Two green stubby arrows joined means the object will 'run' when pushed in that direction (and won't stop until it is blocked).

Get this ALPHA (0.0.6) release from http://www.jwm-art.net/art/archive/XorGramana-0.0.6.tar.bz2.

Enjoy, briefly.

This file illustrates what checks should take place
when a bomb object is detonated. Please view in a

Game Logic

The game logic within the original Xor game, which I (hopefully)
correctly implemented in XorCurses, had the following important
rules governing precedence of moving objects:

If player moves right to collect a pickup which has
both a falling object and a left-running object resting
against it (the pickup) then which moves first depends
on which direction the player moves to get out of it.

If player moves down, the left-moving object moves before
the falling object. If the player moves left, the falling
object moves before the left-moving object. (And if there
were chains of objects all of each type move before the
other type).

This logic was also relfected in the detonation of bombs
and the order in which consequences of the detonation
were checked (I believe). The immediate concern here was
the difference between (aside from h-bombs and v-bombs)
detonators that fell, and detonators which ran left, as
to which points were checked for further gravitating
objects which were resting before the bomb went off.

Game Logic II

XorGramana on the other hand has further behaviour characteristics
to bear in mind: objects can now also rise up, or run right.

(My source code uses the term 'gravitate' for these objects which
 move as soon as their path is clear up to the point their path
 is blocked - they gravitate always in the same direction, and
 can be pushed vertically if they move one of the horizontal
 directions, or pushed horizontally if they move in one of vertical

(Gravitating objects exclude the Doll object which only moves
 when the player pushes it - the doll continues moving until it
 is blocked - but it is excluded from the definition and logic
 of gravitational behaviour - the Doll cannot pass through force
 fields, cannot detonate bombs, and cannot harm the player, nor
 can the doll move without being pushed).

Therefor with four different types of gravitating movement:


We have a more complex set of rules to check and a decision to
be made on how the precedence of these rules is to be set.

In XorGramana, it has been decided that the down/left precedences
will remain, and that objects moving down and left will also
preside over objects moving up and right - the down and left therefor
are the 'natural' directions (which does not mean up and right are

Bomb Types

1a) h-bomb which falls down
2a) v-bomb which runs left
1b) h-bomb which rises up
2b) v-bomb which runs right.

(note: types 1a and 2a are those from
 orignal Xor game and therefor have
 precedence over the two new types).

Detonator Types

1) detonator falls down
2) detonator runs left
3) detonator rises up
4) detonator runs right

(note: types 3 and 4 and new and have lower
 precedence than those from original Xor game).

 Bomb Detonation Checking

#                                #
# ^    | or <- or ->             #
# | or V = detonator direction   #
#                                #
# X = bomb position              #
#                                #
# x = bomb explosion             #
#                                #
# 0,1,2,3,4,5,6,7,8,9            #
#  = coord to be checked in      #
#    order (lowest first)        #
#                                #

1) bomb type: 1a (h-bomb,down)  detonator type: 1 (down)
     5 4  

2) bomb type: 1a (h-bomb,down)  detonator type: 2 (left)
    4 3   

3) bomb type: 1a (h-bomb,down)  detonator type: 1 (up)
     5 4  

4) bomb type: 1a (h-bomb,down)  detonator type: 2 (right)
    5 4   

bomb type: 1b (h-bomb,up)    detonator type: 1 (down)
          (yes this is possible)
bomb type: 1b (h-bomb,up)    detonator type: 2 (left)
(((UNFINISHED)))13:43  Friday 13th March 2009



"XorGramana ALPHA (0.0.6)"

Latest development release of XorGramana

Journal entry - 14:15 Friday 13 March 2009

DISCLAIMER: The opinions and attitudes of James W. Morris as expressed here in the past may or may not accurately reflect the opinions and attitudes of James W. Morris at present, moreover, they may never have.


this page last updated:29th April 2013 jwm-art.net (C) 2003 - 2014 James W. Morris

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