From: "Simon Kröger" Date: 2005-11-24T22:05:39+09:00 Subject: [ANN] RRobots - ducks, armed and dangerous RRobots v0.1 First there was CRobots, followed by PRobots and many others, recently (well also years ago) Robocode emerged and finally this is RRobots bringing all the fun to the ruby community. What is he talking about? RRobots is a simulation environment for robots, these robots have a scanner and a gun, can move forward and backwards and are entirely controlled by ruby scripts. All robots are equal (well at the moment, maybe this will change) except for the ai. A simple robot script may look like this: ----------------------- code ----------------------- require 'robot' class NervousDuck include Robot def tick events turn_radar 1 if time == 0 turn_gun 30 if time < 3 accelerate 1 turn 2 fire 3 unless events['robot_scanned'].empty? end end ----------------------- code ----------------------- all you need to implement is the tick method which should accept a hash of events occured turing the last tick. By including Robot you get all this methods to controll your bot: battlefield_height #the height of the battlefield battlefield_width #the width of the battlefield energy #your remaining energy (if this drops #below 0 you are dead) gun_heading #the heading of your gun, 0 pointing east, #90 pointing #north, 180 pointing west, 270 pointing south gun_heat #your gun heat, if this is above 0 you can't shoot heading #your robots heading, 0 pointing east, 90 pointing #north, 180 pointing west, 270 pointing south size #your robots radius, if x <= size you hit #the left wall radar_heading #the heading of your radar, 0 pointing east, #90 pointing north, 180 pointing west, #270 pointing south time #ticks since match start velocity #your velocity (-8/8) x #your x coordinate, 0...battlefield_width y #your y coordinate, 0...battlefield_height accelerate(param) #accelerate (max speed is 8, #max accelerate is 1/-1, #negativ speed means moving backwards) stop #accelerates negativ if moving forward #(and vice versa), may take 8 ticks to stop (and #you have to call it every tick) fire(power) #fires a bullet in the direction of your gun, #power is 0.1 - 3, this power will heat your gun turn(degrees) #turns the robot (and the gun and the radar), #max 10 degrees per tick turn_gun(degrees) #turns the gun (and the radar), max 30 degrees #per tick turn_radar(degrees) #turns the radar, max 60 degrees per tick dead #true if you are dead These methods are intentionally of very basic nature, you are free to unleash the whole power of ruby to create higher level functions. (e.g. move_to, fire_at and so on) Some words of explanation: The gun is mounted on the body, if you turn the body the gun will follow. In a simmilar way the radar is mounted on the gun. The radar scans everything it sweeps over in a single tick (100 degrees if you turn your body, gun and radar in the same direction) but will report only the distance of scanned robots, not the angle. If you want more precission you have to turn your radar slower. RRobots is implemented in pure ruby using a tk ui and should run on all platforms that have ruby and tk. (until now it's tested on windows only) To start a match call e.g. ruby rrobots.rb SittingDuck NervousDuck the classes have to be defined in files with the same name. (SittingDuck.rb and NervousDuck.rb for the example above) You can download the 0.1 release from rubyforge: http://rubyforge.org/frs/?group_id=1109 The best way to help and keep me motivated would be to post some cool bots here (along with the bug-reports and feature requests) cheers Simon (and thanks to the robocode project for the nice graphics)