Bazza
LXF regular
Joined: Sat Mar 21, 2009 11:16 am
Posts: 1392
Location: Loughborough
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 Posted: Thu Jun 02, 2011 6:56 pm Post subject: Another Python Freebie Based On MikeTron... |
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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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_________________
73...
Bazza, G0LCU...
Team AMIGA... |
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