Another Python Freebie Based On MikeTron...

Bazza — Thu Jun 02, 2011 6:56 pm

Author: Bazza

Posted: Thu Jun 02, 2011 6:56 pm

Hi all...

A DEMO to show how to plot XY inside a standard text mode Python
install. MikeTron gave me the idea of making this into a dreadful game.
It is primarily to show, using an INKEY$ idea for keyboard control,
how to plot characters inside a Python shell.

It is assumed that the shell is defaulting at 80 x 24 and Python is 2.6.x
or greater although it may work in earlier versions.

The INKEY$ function is not perfect but works reasonably well considering
Python is not able to do this by default.

I take no credit for this function and the pointer to the original is inside
the code. I do take credit for the plotting method though and shows
that Python can still do things without all the glitz added.

This plotting method is going to be used in a serious project I have in
mind.

Enjoy finding simple solutions to often very difficult problems...

Read the code for more information.

Code:

# SimpleTron2x.py
#
# Yes I know it is not much of a game but it is intended to show how to
# "draw", AND, to use the keyboard to "draw" inside a standard text mode
# Python shell.
#
# Written in such a way as to easily understand how it works.
#
# IMPORTANT NOTE!!! This ASSUMES a standard 80 x 24 shell window.
#
# This working idea is copyright, (C)2011, B.Walker, G0LCU.
# NOW issued as Public Domain to LXF...
#
# To run at the prompt...
# >>> execfile("/full/path/to/SimpleTron2x.py")

def main():
import os
import sys
import termios
import tty
import random

# A basic clear screen and cursor removal for program start...
os.system("clear")
os.system("setterm -cursor off")

# Make any variables global just for this DEMO "game"...
global screen_array
global character
global line
global position
global remember_attributes
global plot
global inkey_buffer
global score

screen_array="*"
character="a"
remember_attributes="(C)2011, B.Walker, G0LCU."
line=1
position=0
plot=int(random.random()*4)
inkey_buffer=0
score=0

# This is a working function; something akin to the BASIC INKEY$ function...
# Reference:- http://code.activestate.com/recipes/134892-getch-like-unbuffered-character-reading-from-stdin/
# Many thanks to Danny Yoo for the above code, modified to suit this program...
# In THIS FUNCTION some special keys do a "break" similar to the "Esc" key inside the program.
# Be aware of this...
# An inkey_buffer value of 0, zero, generates a "" character and carries on instead of waiting for
# a valid ASCII key press.
def inkey():
   fd=sys.stdin.fileno()
   remember_attributes=termios.tcgetattr(fd)
   tty.setraw(sys.stdin.fileno())
   character=sys.stdin.read(inkey_buffer)
   termios.tcsetattr(fd, termios.TCSADRAIN, remember_attributes)
   return character

# The welcome screen.
print ""
print "SimpleTron2x.py. A simple, odd style, Tron(ish) game."
print "Another DEMO 2D animation for Linux platforms."
print ""
print "You control a vehicle leaving a trail behind it."
print ""
print "It is NOT always moving, and if it crosses any part"
print "of the trail or border, (* characters), the game"
print "is over. It CAN randomly move further than the key"
print "presses so do not assume there is a bug... :)"
print "Use the Q and A keys to change the direction to"
print "up and down, and O and P for left and right."
print "See how long you can survive! Score at the end."
print ""
character=raw_input("Hit <RETURN/ENTER> to begin... ")

# Generate the game window as a single text string.
# This assumes a standard 80x24 terminal text window.
# Top line.
while position<=78:
   screen_array=screen_array+"*"
   position=position+1
# Next 20 lines.
while line<=20:
   position=1
   screen_array=screen_array+"*"
   while position<=78:
      screen_array=screen_array+" "
      position=position+1
   screen_array=screen_array+"*"
   line=line+1
screen_array=screen_array+"*"
# Bottom line.
position=0
while position<=78:
   screen_array=screen_array+"*"
   position=position+1

# Store the complete string for future use.
gamefile=open("/tmp/TronArray","w+")
gamefile.write(screen_array)
gamefile.close()
# End of game setup...

# Start of game proper, set the initial position.
position=(int(random.random()*60)+890)
while 1:
   # Standard clear the terminal window.
   os.system("clear")
   print screen_array
   # Add another * when inkey_buffer=0.
   inkey_buffer=int(random.random()*2)
   # Use the INKEY$ function to grab an ASCII key.
   character=inkey()
   if character=="a": plot=0
   if character=="A": plot=0
   if character=="q": plot=1
   if character=="Q": plot=1
   if character=="o": plot=2
   if character=="O": plot=2
   if character=="p": plot=3
   if character=="P": plot=3
   # Esc key to exit the loop...
   if character==chr(27): break
   if plot==0: position=position+80
   if plot==1: position=position-80
   if plot==2: position=position-1
   if plot==3: position=position+1
   if position>=1759: position=1759
   if position<=0: position=0

   gamefile=open("/tmp/TronArray","r+")
   # Check for a * character in the array and......
   gamefile.seek(position)
   if gamefile.read(1)=="*":
      # ......exit if one exists at that point.
      gamefile.close()
      print "Game Over! You scored",score,"\b..."
      break
   gamefile.seek(position)
   gamefile.write("*")
   # Now get the whole array.
   gamefile.seek(0)
   screen_array=gamefile.read(1760)
   gamefile.close()
   # End of screen_array update per plot.
   score=score+1

# Reset the cursor, etc...
os.system("setterm -cursor on")
character=raw_input("Have another game? (Y/N):- ")
if character=="y": main()
if character=="Y": main()
if character=="": main()

main()

# SimpleTron2x.py end of game.
# Enjoy finding simple solutions to often very difficult questions.

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Another Python Freebie Based On MikeTron...