exit child when exec fails

[micropolis] / src / PLAN.txt

Plan for developing Micropolis for OLPC.

First, get it running on the current OLPC platform.

  DONE:

    Screen depth and size: fixed size of OLPC screen.
    Window management: one window. 
    Simplify window management. Single map and editor view. Tiled graph and evaluation windows. 
    Rearrange startup screen so it works in the full window mode.
    Make budget window and file dialogs be transient popup windows.
    Add "Enable/Disable Auto Budget" button to budget window.
    Click on small R/C/I gauge to toggle evaluation window.
    Click on small graph to toggle graph window.
    Click on funds or tax rate to show budget window.
    Disable multi player features by default (added -m flag to enable multi player mode).
    Disable other experimental features (cellular automata, dynamic query, etc).
    Add -S flag to enable Sugar features, and TCL access to test flag.
    Enable audio: Use Sugar audio server.
      Convert sounds to new audio format (currently wav).

    Fix fonts. 
      Pick nice Sugar fonts to use, based on Sugar flag. 

  TODO:
    Update manual and documentation.

    Make Sugar activity wrapper in Python.

    Put new graphics and icons into interface and menus.


Replace TCL/Tk with Python/GTK, and use Pango/Cairo for graphics.
  Implement custom Tk components in GTK.
    Map view.
    Editor view.
    Date view.
    Graph view.
    Pie menus.
    Cellular Automata Machine view.

  Integrate with Sugar and OLPC hardware.
    Audio.
      Support CSound audio mixer.
      Switch to a smaller audio format.
      Record better sounds.
    Internationalization.
    Graphics.
      Hires monochrome. 
      SVG graphics and icons. 
      Create better icons. 
    Sugar integration. 
      Integrate with OLPC activity system, window manager, etc. 
      Rework user interface to follow Sugar user interface guidelines. 
    Keyboard control.
      Support OLPC keyboard layout and device buttons. 
      Game keypad interface for book mode.
    Optimization.
      Optimize power management.
      Optimize size.
      Optimize speed.
    Documentation.
      Integrated help, tutorials, essays on city design from manual, etc. 
      Voiceovers, demos, journal playback.
      Courseware. 
      Map annotation. 
    Journaling.
      Event history.
      Edit history. 
      Checkpointing. 
      Branching histories. 
      Rewinding and fast forwarding. 
      Publishing newspaper articles linking to save files.
      URL to link into a city at a particular location on the map.
    Grid networking. 
      Multi player stupport.
        Sharing cities.
        Colaborative editing.
        Voting. 
        Chat. 
	White board.
    Educational.
      Bring old Micropolis courseware up to date, and integrate with the game. 
      Export simulation data to spreadsheet or xml. 
      Creative writing, storytelling, newspaper reporting, blogging, etc.
      Scenarios and experiments.
      What-if? 
        Branching history at decision point, and comparing different results. 
      Scripting. 
        Open up the simulator to Python. 
        Web services to remotely monitor and control simulation. 
	HTML or AJAX web server remote control interface.
	  Support multi player interactions through web server.
	    Submit a proposal to build a stadium over the web.
	    Style it like a real civic government web page, that allows citizens to participate online. 
	Enable extending the graphics, tiles, sprites. 
	Enable programming behaviors, defining new zones, new global variables, overlays, etc. 
	Cellular automata.
	Visual programming.
	Programming by example. 
	KidSim, AgentSheets. 

    Visual Programming

      Simplify the Micropolis interface and make it easier for kids to
      use it with the game controller, in a way that will support
      multi player interaction.

      Collapse the separate concepts of game editing tool (bulldozer,
      road, residential zone, etc) and agent (sprites like the
      monster, tornado, helicopter, train, etc).

      Agents with specialized tool represent different roles that kids
      can play. A bunch of kids can join together and play different
      roles at the same time in the same city. Instead of having a
      bunch of editing tools to switch between, you have a bunch of
      different agents you can drive around the map, like using a
      monster to crush things instead of a bulldozer, or riding around
      in a helicopter to scroll around and observe the map. Make a
      meta-game like pokemon trading cards or magic the gathering,
      about acquiring and deploying and using agents on the map. Give
      agents different budgets and constraints.

      Use an agent to represent a user in the world, and control an
      editing tool. You see other users in the map driving around
      their editing tool agents.

      Each editing tool can be associated with a particular agent,
      with a keyboard/game controller based user interface for moving
      around, as well as a mouse based interface for picking it up and
      dragging it around.

      The road tool becomes a road building vehicle, that you can
      easily move up/down/left/right/diagonally with the game
      controller directional input. Requires much less coordination to
      draw straight roads than with a mouse. 

      The bulldozer tool becomes an actual bulldozer that you can
      drive around the map, crushing things in your wake.

      This makes the game easily usable by little kids in book mode. 

      Also support small children using Micropolis like a drawing tool or
      etch-a-sketch, simply doodling with the editing tools for the
      visceral pleasure of it, and setting fires and other disasters
      to watch it burn and mutate.

      Logo Turtles (as a generalization of the monster, tornado,
      helicopter, etc)

        Implement programmable logo turtles as agents that can move
        around on the map, sense it, and edit it. 

	Like Robot Odyssey agents, so you can go "inside" an agent,
	and travel around with it, operate its controls, read its
	sensors, and automate its behvior by wiring up visual programs
	with logic and math and nested "ic chip" components.

	Plug in graphics to represent the agent: use classic logo
	turtle and Micropolis sprites, but also allow kids to plug in
	their own.
	  Micropolis sprites have 8 rotations. 
	  SVG or Cairo drawings can be rotated continuously.

        Re-implement the classic Micropolis agents like the monster,
        tornado, helicopter, train, etc in terms of logo turtles, that
        kids can drive around, learn to use, open up and modify (by
        turning internal tuning knobs, or even rewiring).

	Let kids reprogram the agents to do all kinds of other stuff.

	Mobile robots, that you can double click to open up into
	Robot-Odyssey-esque visual program editors.

	Agents have local cellular-automata-like sensors to read
	information about the current and surrounding tiles.

	KidSim / Cocoa / StageCraft Creator let kids define visual
	cellular automata rules by example, based on tile patterns and
	rules. Show it a pattern that you want to match by selecting
	an instance of that pattern in the world, then abstract it
	with wildcards if necessary, then demonstrate the result you
	want it to change the cell to in the next generation.

	Sense high level information about zones and overlays, so the
	agents can base their behavior on any aspect of the world
	model.

	  Support an extensible model by allowing users to add more
	  layers.

	    Add layers with arbitrary names and data types at
	    different resolutions:

	      byte, int, float, n-dimensional vector, color, boolean
	      mask, musical note, dict, parametric field (i.e. perlin
	      noise or other mathematical function) at each cell, etc.

	Edit the world. 

	  All Micropolis editing tools (including colored pens that draw
	  on overlays) should be available to the agent.

	  Enable users to plug in their own editing tools, that they
	  can use themselves with the mouse, keyboard or game
	  controller, or program agents to use to edit the map under
	  program control.

      Robot Odyssey

        Build your own universal programmable editing tool.
	Roll your own von Neuman Universal Constructor. 
	Smart robots you program to perform special purpose editing tasks. 

	The "Painter" picture editing program had a way of recording
	and playing back high level editing commands, relative to the
	current cursor position.

	Remixing. Journaling. Programming by demonstration or example.
	You could use a tape recorder to record a bunch of Micropolis
	editing commands that you act out (or you can just select them
	from the journal), then you can play those tapes back with
	relative coordinates, so they apply relative to where the
	agent currently is on the map. You can copy and paste and cut
	and splice any editing commands into tapes that you can use to
	program the robot to play back in arbitrary sequences. 

	Program an urban sprawl development-bot to lay out entire
	residential subdivisions, complete with zones, roads, parks and
	wires. Then program a luddite roomba-bot that sucks them all
	up and plants trees in their place.

	This becomes really fun when we let players plug in their own
	programmed zones for the robot to lay out, and layers of data
	to control the robot's behavior, out of which they can program
	their own cellular automata rules and games (like KidSim /
	Cocoa / StageCraft Creator).

--
Micropolis, Unix Version.  This game was released for the Unix platform
in or about 1990 and has been modified for inclusion in the One Laptop
Per Child program.  Copyright (C) 1989 - 2007 Electronic Arts Inc.  If
you need assistance with this program, you may contact:
  http://wiki.laptop.org/go/Micropolis  or email  micropolis@laptop.org.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at
your option) any later version.

This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.  You should have received a
copy of the GNU General Public License along with this program.  If
not, see <http://www.gnu.org/licenses/>.

            ADDITIONAL TERMS per GNU GPL Section 7

No trademark or publicity rights are granted.  This license does NOT
give you any right, title or interest in the trademark SimCity or any
other Electronic Arts trademark.  You may not distribute any
modification of this program using the trademark SimCity or claim any
affliation or association with Electronic Arts Inc. or its employees.

Any propagation or conveyance of this program must include this
copyright notice and these terms.

If you convey this program (or any modifications of it) and assume
contractual liability for the program to recipients of it, you agree
to indemnify Electronic Arts for any liability that those contractual
assumptions impose on Electronic Arts.

You may not misrepresent the origins of this program; modified
versions of the program must be marked as such and not identified as
the original program.

This disclaimer supplements the one included in the General Public
License.  TO THE FULLEST EXTENT PERMISSIBLE UNDER APPLICABLE LAW, THIS
PROGRAM IS PROVIDED TO YOU "AS IS," WITH ALL FAULTS, WITHOUT WARRANTY
OF ANY KIND, AND YOUR USE IS AT YOUR SOLE RISK.  THE ENTIRE RISK OF
SATISFACTORY QUALITY AND PERFORMANCE RESIDES WITH YOU.  ELECTRONIC ARTS
DISCLAIMS ANY AND ALL EXPRESS, IMPLIED OR STATUTORY WARRANTIES,
INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY, SATISFACTORY QUALITY,
FITNESS FOR A PARTICULAR PURPOSE, NONINFRINGEMENT OF THIRD PARTY
RIGHTS, AND WARRANTIES (IF ANY) ARISING FROM A COURSE OF DEALING,
USAGE, OR TRADE PRACTICE.  ELECTRONIC ARTS DOES NOT WARRANT AGAINST
INTERFERENCE WITH YOUR ENJOYMENT OF THE PROGRAM; THAT THE PROGRAM WILL
MEET YOUR REQUIREMENTS; THAT OPERATION OF THE PROGRAM WILL BE
UNINTERRUPTED OR ERROR-FREE, OR THAT THE PROGRAM WILL BE COMPATIBLE
WITH THIRD PARTY SOFTWARE OR THAT ANY ERRORS IN THE PROGRAM WILL BE
CORRECTED.  NO ORAL OR WRITTEN ADVICE PROVIDED BY ELECTRONIC ARTS OR
ANY AUTHORIZED REPRESENTATIVE SHALL CREATE A WARRANTY.  SOME
JURISDICTIONS DO NOT ALLOW THE EXCLUSION OF OR LIMITATIONS ON IMPLIED
WARRANTIES OR THE LIMITATIONS ON THE APPLICABLE STATUTORY RIGHTS OF A
CONSUMER, SO SOME OR ALL OF THE ABOVE EXCLUSIONS AND LIMITATIONS MAY
NOT APPLY TO YOU.